Blocks

Highlights This professional precision set combines 10 pairs of 1/8" x 4" steel parallels with a matched pair of 1-2-3 blocks, providing accurate workpiece support, alignment, and measurement references for machining and inspection applications. Key Features ✔ Complete Machining Setup Set – Includes 10 matched pairs of precision parallels and a matched pair of 1-2-3 blocks for workholding, setup, inspection, and layout tasks. ✔ Hardened Tool Steel Construction – Made from premium tool steel with hardened and stress-relieved surfaces for excellent durability, wear resistance, and long-term dimensional stability. ✔ Precision Ground Accuracy – Manufactured within 0.001" size tolerance with 0.0003" parallelism on the top and bottom working surfaces for dependable reference accuracy. ✔ Versatile 1-2-3 Blocks – Precision ground on all six sides, providing reliable squaring, positioning, setup, and measurement references in machine shop applications. ✔ Lightweight & Strong Design – Parallels feature handling holes and blocks use a cross-drilled design to reduce weight while maintaining rigidity and strength. Specifications Item Specification Product Type Steel Parallel & 1-2-3 Block Set Quantity 10 Matched Pairs Parallels + 1 Matched Pair Blocks Material Hardened Tool Steel Parallel Size 1/8" x 4" 1-2-3 Block Size 1" x 2" x 3" Parallelism 0.0003" Size Tolerance Within 0.001" Block Squareness Accuracy 0.0002" per inch Surface Finish Hardened and Precision Ground Application Ideal for precision machining applications including milling machines, drill presses, machining centers, fixture setups, inspection, layout, and measurement. The parallel set provides stable workpiece elevation, while the 1-2-3 blocks offer accurate squaring and positioning support. Package Includes 10 Pair 1/8" x 4" Steel Parallel Set 1 Pair 1-2-3 Precision Blocks

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Highlights This professional machining set combines 10 pairs of precision 1/8" x 5" steel parallels with a matched pair of 1-2-3 blocks, providing accurate workpiece support, alignment, and measurement references for machine shop applications. Key Features ✔ Complete Precision Setup Kit – Includes 10 matched pairs of 1/8" x 5" parallels and a matched pair of 1-2-3 blocks for machining, inspection, and setup work. ✔ Hardened Tool Steel Construction – Made from premium tool steel with hardened and stress-relieved surfaces for excellent durability, wear resistance, and dimensional stability. ✔ High Accuracy Performance – Precision ground parallels provide 0.0003" parallelism on top and bottom surfaces, ensuring reliable support for precision machining tasks. ✔ Multi-Function 1-2-3 Blocks – Ground on all six sides with 0.0002" per inch squareness accuracy, serving as setup blocks, squaring references, and measurement tools. ✔ Lightweight & Rigid Design – Parallels feature two handling holes and blocks use a cross-drilled design to reduce weight while maintaining strength and stability. Specifications Item Specification Product Type Steel Parallel & 1-2-3 Block Set Quantity 10 Matched Pairs Parallels + 1 Matched Pair Blocks Material Hardened Tool Steel Parallel Size 1/8" x 5" 1-2-3 Block Size 1" x 2" x 3"0 Parallelism 0.0003" Block Squareness Accuracy 0.0002" per inch Surface Finish Precision Ground Application Designed for precision machining operations including milling, drilling, machining center setups, inspection, layout, and measurement. The parallel set provides stable workpiece elevation and support, while the 1-2-3 blocks help with squaring, positioning, and fixture alignment. Package Includes 10 Pair 1/8" x 5" Steel Parallel Set 1 Pair 1-2-3 Precision Blocks

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Highlights This professional 1-2-3 Block and Parallel Set combines precision ground tool steel blocks with 10 matched pairs of 1/8" x 6" parallels, providing reliable support, alignment, and inspection accuracy for machining applications. Key Features ✔ Complete Machining Setup Set – Includes a matched pair of 1-2-3 blocks and 10 pairs of precision parallels for workholding, inspection, layout, and setup tasks. ✔ Hardened Tool Steel Construction – Made from premium tool steel that is hardened and stress-relieved for excellent wear resistance, durability, and dimensional stability. ✔ High Precision Accuracy – Parallels feature 0.0003" parallelism on top and bottom surfaces, while the 1-2-3 blocks provide accurate reference surfaces for machining setups. ✔ Lightweight Yet Rigid Design – Two holes in each parallel and cross-drilled 1-2-3 blocks reduce weight while maintaining strength and stability. ✔ Versatile Workshop Tool – Ideal for milling, drilling, inspection, measurement, fixture setup, and precision workpiece positioning. Specifications Item Specification Product Type Parallel Block & 1-2-3 Block Set Quantity 10 Matched Pairs Parallels + 1 Pair 1-2-3 Blocks Material Hardened Tool Steel Parallel Size 1/8" x 6" 1-2-3 Block Size 1" x 2" x 3" Parallelism 0.0003" Block Accuracy 0.0002" per inch for squareness Surface Treatment Hardened and Precision Ground Application Designed for professional machining and inspection applications, including milling machines, drill presses, machining centers, fixture setups, layout work, and measurement tasks. The parallels provide stable workpiece support, while the 1-2-3 blocks serve as squaring blocks, setup tools, and precision references. Package Includes 10 Pair 1/8" x 6" Precision Steel Parallel Set 1 Pair 1-2-3 Precision Blocks

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Highlights This 10 Pair Precision Parallel Block Set features hardened alloy steel construction and precision ground surfaces, providing ±0.0002" accuracy for reliable machining setups, clamping, and workpiece positioning. Key Features ✔ Precision Matched Pair Set – Includes 10 matched pairs of parallel blocks for accurate machining, inspection, and workholding applications. ✔ High Accuracy Design – Hardened and ground from stabilized alloy steel stock, maintaining ±0.0002" accuracy in parallelism and height tolerance. ✔ Durable Alloy Steel Construction – Made of high-quality alloy steel with hardened surfaces for excellent durability and long service life. ✔ Flexible Height Selection – Includes height sizes in 1/8" increments from 1/2" to 1-5/8", helping achieve proper workpiece positioning. ✔ Convenient Storage – Comes with a storage box for easy organization and portability. Wooden and plastic boxes are randomly dispatched. Specifications Item Specification Product Type Parallel Block Set Quantity 10 Matched Pairs (20 Pieces Total) Material Hardened Alloy Steel Size 5" Length × 1/8" Width Height Range 1/2" to 1-5/8" Height Increment 1/8" Accuracy ±0.0002" Application Suitable for precision machining tasks including drilling, boring, milling, grinding, and assembly work. These parallel blocks provide stable support in vises, raise workpieces for improved tool clearance, and assist with accurate alignment during machining operations. Package Includes 10 Pair Precision Parallel Block Set 1 × Storage Box

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Highlights This 10 Pair Precision Parallel Block Set is made from hardened alloy steel with precision ground surfaces, delivering reliable ±0.0002" accuracy for machining, clamping, and setup applications. Key Features ✔ Precision Matched Pair Set – Includes 10 matched pairs of parallel blocks designed for accurate workholding and machining setups. ✔ High Accuracy Performance – Hardened and ground from stabilized alloy steel stock, maintaining ±0.0002" accuracy in parallelism and height tolerance. ✔ Durable Alloy Steel Construction – Made of high-grade alloy steel with hardened surfaces for excellent wear resistance and long service life. ✔ Multiple Height Options – Features 1/8" height increments from 1/2" to 1-5/8", providing flexible workpiece positioning. ✔ Easy Storage & Handling – Includes a storage box for convenient organization and portability. Wooden boxes and plastic boxes are randomly dispatched. Specifications Item Specification Product Type Parallel Block Set Quantity 10 Matched Pairs (20 Pieces Total) Material Hardened Alloy Steel Size 4" Length × 1/8" Width Height Range 1/2" to 1-5/8" Height Increment 1/8" Accuracy ±0.0002" Application Ideal for precision machining operations such as drilling, boring, milling, grinding, and assembly work. These parallel blocks help elevate workpieces in vises, improve cutting tool clearance, and provide stable positioning during machining tasks. Package Includes 10 Pair Precision Parallel Block Set 1 × Storage Box

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Highlights This 10 Pair Parallel Block Set is made from hardened alloy steel with precision ground surfaces, providing reliable accuracy for machining, clamping, and setup applications. Each matched pair is designed for stable workpiece positioning with ±0.0002" accuracy. Key Features ✔ Precision Matched Pair Set – Includes 10 matched pairs of parallel blocks with consistent dimensions for accurate machining setups and workholding. ✔ High Accuracy Construction – Hardened and ground from stabilized alloy steel stock, maintaining ±0.0002" accuracy in parallelism and height tolerance. ✔ Durable Alloy Steel Material – Made of high-grade alloy steel with hardened surfaces for long service life and repeated workshop use. ✔ Multiple Height Options – Provides 1/8" incremental height sizes from 1/2" to 1-5/8", allowing flexible workpiece positioning. ✔ Easy Handling Design – Each block features handling holes for convenient setup and adjustment during machining operations. Specifications Item Specification Product Type Parallel Block Set Quantity 10 Matched Pairs (20 Pieces Total) Material Hardened Alloy Steel Size 3" Length × 1/8" Width Height Range 1/2" to 1-5/8" Height Increment 1/8" Accuracy ±0.0002" Application Ideal for precision machining and workshop applications including drilling, boring, milling, grinding, assembly work, and general workholding. These parallel blocks help raise workpieces in vises, improve tool clearance, and provide stable alignment during machining operations. Package Includes 10 Pair Precision Parallel Block Set 1 × Storage Box

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1" x 2" x 3" Blocks. This is a matched set (2 each) of professional quality 1 x 2 x 3" blocks.   High Accuracy Steel Overall size is within +/- .0002" Flatness and parallelism are within .0002" Squareness on all sides to within 0.0003" Pairs are matched to a tolerance of 0.0002"   They are high accuracy ground and case hardened to RC 55-60 on all six sides; They contain one untapped 1/2 inch through hole; We will wrapped in oil and paper prevent the product to rusting.   Used for set-up, layout and inspection jobs, for excemple you can use it for set up blocks, bolster parallels, and for x, y, z touch probe operations when an actual part is not available. If I put the parallel block on the ground, how high is it? What does 1, 2, 3 refer to respectively? Depending on which side you put on the ground, the dimensions of the three sides are 1 inch, 2 inches, and 3 inches. Can a 1/3 inch screw go through the hole? The size of the hole is 1/2 inch and it can be passed through. But this is an untapped hole, can not play the role of fastening Does it rust easily? Under normal circumstances, it is not easy to rust, but should pay attention to moisture, although it is covered with a layer of rust-proof wax paper, but if not used after receiving the goods, it should be regularly brushed with oil. Is this one or a pair? This is 1 pair (2 pieces) Is he stainless steel? No, as far as I know, 40Cr steel is alloy steel

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Product description   2 3 4 Accuracy Ground Machinist Set High accuracy ground and case hardened to RC 55-62 on all six sides 23 each 3/8 inch through holes (5 tapped with 3/8-16 threads and 18 untapped) Overall size is within +/- .0003" Pairs are matched to a tolerance of 0.0002"   2-3-4 Blocks   Matched pair 2-3-4 blocks includes 2 blocks Overall size is within +/- .0003" Flatness and parallelism are within .0003" Squareness on all sides to within 0.0003" Pairs are matched to a tolerance of 0.0002" 2 pieces per set   Made of accuracy - grade tool steel hardened and ground on all 6 sides of block, heat treated and case hardened to HRC 55-62   Accuracy Ground Machinist Set   Squareness on all sides within 0.0003" Overall size is within +/- .0003"; Flatness and parallelism within .0003" Pairs are matched to a tolerance of 0.0002" Strong material   Made of accuracy-grade tool steel hardened and ground on all 6 sides of block, heat treated and case hardened to HRC 55-62 2-3-4 Blocks 23 Holes   23 each 3/8 inch through holes (5 tapped with 3/8-16 threads and 18 untapped)        

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Hardness: 50-55 HRc Parallelism: +/- 0.0002" Matched pair height: +/- 0.0002" Size Range: 1/2" - 1-1/2" 1/8" 9 Pair Parallel Set -These are hardened steel are accuracy ground in multiple sizes of matched pairs. They are ground for tight tolerances on the top bottom edges. 1. Use these to be sure your work is square and flat on the bottom of your vise. 2. Place a parallel against each vise jaw rest your workpiece on top. 3. Parallels raise your work piece within the vise allowing more clearance for cutting tools. The holes in their sides are useful for clamping parallels for extra support.

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Product description Robust and durable, wide range of specifications   The 1/32 x 6 accuracy parallel block set comes in a total of twenty pairs, with twenty different models to meet your various needs at work. The accuracy parallel block is made of 65Mn spring steel for durability and resistance to deformation. Ideal for your work. Specification Material: Steel Parallelism: +/-0.0001 Matched pair height: +/- 0.0002   Quenching processing, high-accuracy   Adopting quenching processing technology, with high accuracy, high hardness, very durable, and not easily deformed. Accuracy workmanship   Every detail has been accurately measured and polished, Parallelism: +/- 0.0001; Matched pair height: +/- 0.0002. Delicate box   The accuracy parallel block set is packaged in a simple and sophisticated box that is easy to store and carry.     From the brand       Findmall focuses on the field of industrial products and is committed to becoming the top professional industrial tools supplier. Made of high-quality material and refined through strict processing and testing, our products stand out with high precision and durable performance. Over the years, we have provided millions of customers with both high-quality household and industrial manufacturing tools. In Findmall, you can FIND MORE TOOLS you need.   Why choose FINDMALL? Findmall is as serious about industrial tools as you are. We specialize in producing the high precision household and industrial manufacturing tools so that each consumer can enjoy the convenience through technology. Our advantage We have the most comprehensive product portfolio and knowledgeable staff, and our professional production technology is ahead of other industry sellers. Our goals We can provide convenience to customers worldwide with high-quality household and industrial manufacturing tools.   Abrasive & Finishing Products The good products for your professional skills even better           Abrasive & Finishing Products     Tools & Home Improvement The high-quality tools will help you increase your productivity           Tools & Home Improvement     Industrial & Scientific The high precision tool ensure it's work integrity and eliminate rework           Industrial & Scientific     Lathe Parts & Accessories With durable performance, long-term usage           Lathe Parts & Accessories        

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1-2-3 Block Set with 23 Holes, Screws & Storage Case Highlight Precision-ground hardened tool steel setup block designed for milling, inspection, layout, fixturing, and CNC machining. Features a 23-hole design with included screws, hex key, and storage case for convenient setup and accurate positioning. Core Advantages ✔ Premium Hardened Tool SteelManufactured from high-quality hardened tool steel and precision ground on all six sides for superior wear resistance, dimensional stability, and long-term durability. ✔ Exceptional Machining AccuracyEngineered for precision applications with squareness up to 0.0001"/1", parallelism within 0.0002"/1", and dimensional tolerance within 0.0003", ensuring reliable setup and inspection performance. ✔ Functional 23-Hole Clamping DesignFeatures 23 precision-machined holes, including 5 threaded 3/8"-16 holes for secure clamping and 18 untapped holes for flexible fixture and positioning applications. ✔ Lightweight Cross-Drilled ConstructionThe cross-drilled design reduces weight while maintaining maximum structural strength, making the block easier to handle without sacrificing rigidity. ✔ Complete Ready-to-Use KitSupplied with stainless steel socket head cap screws, hex key, and a durable plastic storage case for convenient organization and transport. ✔ Ideal for Precision Setup & InspectionSuitable for machining setup, layout work, quality inspection, fixture building, alignment, and general machine shop applications. Specifications Item Details Material Hardened Tool Steel Dimensions 1" × 2" × 3" Quantity 1 Block Hardness HRC 55–60 Squareness 0.0001"/1" Parallelism 0.0002"/1" Dimensional Tolerance 0.0003" Hole Quantity 23 Holes Threaded Holes 5 × 3/8"-16 Untapped Holes 18 Holes Surface Finish Precision Ground on All 6 Sides Design Cross-Drilled Lightweight Structure   Applications • Milling Machine Setup• CNC Machining• Layout Work• Precision Inspection• Workpiece Positioning• Fixture Building• Alignment Tasks• Measurement & Calibration Package Includes • 1 × Precision 1-2-3 Block• 5 × 3/8"-16 Stainless Steel Socket Head Cap Screws• 1 × Hex Key• 1 × Plastic Storage Case FAQ Q1: What material is the block made from?The block is manufactured from hardened tool steel and precision ground on all six sides for maximum accuracy and durability. Q2: What level of accuracy does the block provide?The block offers squareness of 0.0001"/1", parallelism of 0.0002"/1", and dimensional tolerance within 0.0003". Q3: What are the hole specifications?The block includes 23 holes, consisting of 5 threaded 3/8"-16 clamping holes and 18 untapped holes for versatile fixturing applications. Q4: Are accessories included?Yes. The set includes 5 stainless steel socket head cap screws, a hex key, and a protective plastic storage case. Q5: What applications is this block suitable for?It is ideal for setup, layout, inspection, fixturing, alignment, CNC machining, and other precision machine shop operations.

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1-2-3 Blocks Matched Pair – No Holes Headlight Precision-ground hardened steel setup blocks designed for milling, grinding, inspection, layout work, and machine shop applications. Manufactured from high-grade tool steel and ground on all six sides to provide exceptional accuracy, squareness, and durability. Core Advantages ✔ Hardened & Precision Ground Tool SteelMade from premium accuracy-grade tool steel, heat-treated and case-hardened for superior wear resistance, strength, and long service life. ✔ Exceptional Accuracy & SquarenessPrecision ground on all six sides with squareness maintained within 0.0002" per inch and matched-pair tolerances of up to 0.0001", ensuring reliable setup and measurement results. ✔ High Hardness for Demanding ApplicationsHardened to HRC 57–62 for excellent resistance to deformation, making the blocks suitable for heavy-duty machining and inspection tasks. ✔ Solid No-Hole ConstructionThe solid-body design provides maximum rigidity and stability, making these blocks ideal for precision grinding, layout work, machine setup, and inspection applications. ✔ Versatile Workshop ToolSuitable for milling machines, surface grinders, CNC machining, precision measurement, fixture setup, and general machine shop operations. ✔ Precision Matched PairSupplied as a matched pair for consistent dimensions and dependable performance in setup, alignment, and calibration work. Specifications Item Details Product Type Precision 1-2-3 Blocks Material Hardened Tool Steel Construction Solid Body (No Holes) Dimensions 1" × 2" × 3" Quantity 2 Blocks (Matched Pair) Hardness HRC 57–62 Accuracy 0.0001" – 0.0002" Squareness Within 0.0002" per Inch Surface Finish Precision Ground on All 6 Sides Weight Approx. 3.5 lbs per Pair Applications • Precision Grinding• Milling Machine Setup• CNC Machining• Layout & Inspection Work• Fixture and Tool Setup• Workpiece Alignment• Precision Measurement• Machine Shop Operations Package Includes 2 × Precision 1-2-3 Blocks (No Holes) FAQ Q1: What material are the blocks made from?The blocks are manufactured from accuracy-grade hardened tool steel and precision ground on all six sides. Q2: What is the hardness rating?The blocks are heat-treated and case-hardened to HRC 57–62 for excellent durability and wear resistance. Q3: What level of accuracy do these blocks provide?The matched pair is ground to tolerances of 0.0001"–0.0002", with squareness maintained within 0.0002" per inch. Q4: Why choose the no-hole design?The solid-body construction provides maximum rigidity and stability, making the blocks ideal for precision setup, grinding, and inspection applications. Q5: What applications are these blocks suitable for?They are widely used in milling, grinding, CNC machining, inspection, layout work, fixture setup, alignment, and precision measurement tasks.

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Product description Product Description   The kit includes 10 pairs of 1 / 8 inch × 6 inch (0.3 cm × 15.2 cm) parallel bars with the following heights: 1 / 2 inch, 5 / 8 inch, 3 / 4 inch, 7 / 8 inch, 1 inch, 1-1 / 8 inch, 1-1 / 4 inch, 1-3 / 8 inch, 1-1 / 2 inch and 1-5 / 8 inch. Permanent laser etched dimensions, standard SAE (inches) in each parallel; The two holes in each rod are 4 inches (10.2 cm) from center to center, increasing the diameter by 1 / 8 inch, from 1 / 2 inch to 1-5 / 8 inch. Constructed of tool steel, it eliminates deformation stress, as well as accuracy ground and hardened ultimate strength and life. The package contains (20) parallel bars, each size 2 and 1 storage box for your convenience.   Product Show Grade Alloy Steel   Made of high grade alloy steel, hardened and ground, 2 holes in each parallel. Accuracy Range   Holes designed for easier handling and setup;within +/- 0.0002" in Parallelism and height allowance Easy To Carry   This package contains 10 parallel bars (2 of each size) and 1 storage case for your convenience.     10 Pair 1/8 x 3 Parallel Block Set 9 Pair 1/4 x 6 Parallel Block Set 4 Pair 3/16 x 6 Parallel Block Set 20 Pair 1/32 x 6 Parallel Block Set   Add to Cart Add to Cart Add to Cart Customer Reviews 4.4 out of 5 stars 91 4.4 out of 5 stars 91 — 4.4 out of 5 stars 91 Price $34.99$34.99 $62.40$62.40 — no data $30.90$30.90 SIZE 10 Pair 1/8 x 3 inch 9 Pair 1/4 x 6 inch 4 Pair 3/16 x 6 inch 20 Pair 1/32 x 6 inch   From the brand       Findmall focuses on the field of industrial products and is committed to becoming the top professional industrial tools supplier. Made of high-quality material and refined through strict processing and testing, our products stand out with high precision and durable performance. Over the years, we have provided millions of customers with both high-quality household and industrial manufacturing tools. In Findmall, you can FIND MORE TOOLS you need.   Why choose FINDMALL? Findmall is as serious about industrial tools as you are. We specialize in producing the high precision household and industrial manufacturing tools so that each consumer can enjoy the convenience through technology. Our advantage We have the most comprehensive product portfolio and knowledgeable staff, and our professional production technology is ahead of other industry sellers. Our goals We can provide convenience to customers worldwide with high-quality household and industrial manufacturing tools.   Abrasive & Finishing Products The good products for your professional skills even better           Abrasive & Finishing Products     Tools & Home Improvement The high-quality tools will help you increase your productivity           Tools & Home Improvement     Industrial & Scientific The high precision tool ensure it's work integrity and eliminate rework           Industrial & Scientific     Lathe Parts & Accessories With durable performance, long-term usage           Lathe Parts & Accessories        

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2-4-6 Blocks Matched Pair with 23 Holes Highlight Precision-ground machinist setup blocks manufactured from hardened tool steel for milling, grinding, inspection, layout, and fixturing applications. Engineered for exceptional accuracy, strength, and durability, these 2" × 4" × 6" blocks feature a versatile 23-hole design for flexible workholding and setup operations. Core Advantages ✔ Precision Ground Tool Steel ConstructionManufactured from accuracy-grade tool steel and precision ground on all six sides to provide outstanding dimensional stability, wear resistance, and long service life. ✔ Heat Treated for Maximum DurabilityHeat-treated and case-hardened to HRC 57–62, delivering superior hardness, rigidity, and resistance to deformation in demanding machine shop environments. ✔ High Accuracy & Matched Pair ToleranceOverall dimensions are held within ±0.0003", while flatness, parallelism, and squareness are maintained within 0.0003". Each matched pair is precision-matched to a tolerance of 0.0002". ✔ Versatile 23-Hole DesignEach block features 23 precision-machined holes, including 5 threaded 3/8"-16 holes and 18 untapped through holes, providing multiple options for clamping, fixturing, and positioning workpieces. ✔ Lightweight Cross-Drilled StructureCross-drilling design significantly reduces weight while maintaining maximum structural strength, making the blocks easier to handle without sacrificing rigidity. ✔ Ideal for Precision Machining ApplicationsSuitable for milling, grinding, CNC machining, inspection, layout work, fixture building, alignment, and precision measurement tasks. Specifications Item Details Material Hardened Tool Steel Dimensions 2" × 4" × 6" Quantity 2 Blocks (Matched Pair) Hardness HRC 57–62 Overall Accuracy ±0.0003" Flatness & Parallelism 0.0003" Squareness 0.0003" Matching Tolerance 0.0002" Hole Quantity 23 Holes per Block Threaded Holes 5 × 3/8"-16 Untapped Holes 18 Through Holes   Applications • Milling Machine Setup• CNC Machining• Surface Grinding• Precision Inspection• Workpiece Positioning• Fixture Building• Clamping & Workholding• Layout & Measurement Tasks Package Includes 2 × Precision 2-4-6 Blocks with 23 Holes FAQ Q1: What material are the blocks made from?The blocks are manufactured from accuracy-grade hardened tool steel and precision ground on all six sides. Q2: What is the hardness rating?The blocks are heat-treated and case-hardened to HRC 57–62 for enhanced wear resistance and durability. Q3: How accurate are these 2-4-6 blocks?Overall dimensions are maintained within ±0.0003", with flatness, parallelism, and squareness within 0.0003". The matched pair tolerance is 0.0002". Q4: What are the hole specifications?Each block contains 23 holes, including 5 threaded 3/8"-16 holes for clamping and 18 untapped through holes for versatile fixturing applications. Q5: What machining operations are these blocks suitable for?They are ideal for milling, grinding, CNC machining, inspection, setup work, alignment, fixture building, and precision measurement applications.

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Precision 1-2-3 Blocks Matched Pair Highlight Premium hardened steel machinist setup blocks engineered for precision milling, grinding, inspection, fixturing, and CNC machining applications. Ground on all six sides for exceptional accuracy, durability, and reliable performance in demanding workshop environments. Core Advantages ✔ Hardened & Precision Ground Tool SteelManufactured from high-grade hardened steel and precision ground on all six sides, providing outstanding wear resistance, dimensional stability, and long-term durability. ✔ Exceptional Accuracy & SquarenessEach block is precision machined with accuracy and squareness maintained within 0.0002" per inch, ensuring dependable results for setup, inspection, and machining tasks. ✔ High Hardness for Industrial ApplicationsHeat-treated and case-hardened to HRC 57–62, delivering excellent strength, rigidity, and resistance to deformation under demanding machining conditions. ✔ 23-Hole Multi-Purpose DesignEach block features 23 precision-drilled holes, including 5 threaded 3/8"-16 holes for clamping and 18 untapped 9 mm holes for versatile fixturing and workholding applications. ✔ Lightweight Cross-Drilled ConstructionCross-drilling design reduces overall weight while maintaining maximum structural strength, making the blocks easier to handle without compromising performance. ✔ Versatile Workshop ApplicationsIdeal for milling machines, CNC machining, grinding, inspection, layout work, fixturing, clamping, setup operations, and precision measurement tasks. Specifications Item Details Product Type Precision 1-2-3 Blocks Material Hardened Tool Steel Dimensions 1" × 2" × 3" Quantity 2 Blocks (Matched Pair) Hardness HRC 57–62 Accuracy ±0.0002" per inch Surface Finish Precision Ground on All 6 Sides Threaded Holes 5 × 3/8"-16 Untapped Holes 18 × 9 mm Hole Quantity 23 Holes per Block Weight Approx. 2.1 lbs per Pair Design Cross-Drilled Lightweight Structure Applications • CNC Machining Setup• Milling Machine Operations• Surface Grinding• Precision Inspection• Fixture Building• Workpiece Positioning• Clamping & Workholding• Machine Shop Layout Work   FAQ Q1: What material are the blocks made from?These blocks are manufactured from hardened tool steel and precision ground on all six sides for maximum durability and accuracy. Q2: What is the accuracy of the blocks?The blocks provide squareness and dimensional accuracy within 0.0002" per inch. Q3: What are the threaded hole specifications?Each block includes 5 threaded holes with a 3/8"-16 thread size for clamping and fixture applications. Q4: What are the untapped holes used for?The 18 untapped 9 mm holes allow flexible positioning, fixturing, and custom workholding setups. Q5: What machining applications are these blocks suitable for?They are suitable for milling, grinding, CNC machining, inspection, measurement, fixturing, and general machine shop setup work.

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