Best Inch Gage Blocks in 2026

Perfect for machinists, woodworkers, metalworkers, and more

Each block measures 3 by 2 by 1 inches in size

Features 5 threaded 3/8-16 UNC cross-drilled holes

Grade AS-1 gage block supplied with a Mitutoyo certificate of inspection that the block meets American Society of Mechanical Engineers (ASME) B89.1.9-2002 standard for flatness, length, parallelism, and surface finish

High-carbon, high-chrome steel provides high hardness and wear-resistance

Rectangular base for accurate wringing

Workshop-grade set features 81 individual steel blocks of various sizes

Sizes range from .05 inches all the way up to 4 inches

Includes unique certificate of inspection following ASME B89.1.9 standards

With 23 Holes. Squareness: 0.0001". Parallelism: +/- 0.0001"

Height Accuracy in Pair: +/- 0.0001". Hardness: HRC 56-60. Oversize to allow nominal tapping

Finished from 6-16 micro inches. Nominal Tapping: 0.0001" to 0.0003". Surface finish

Accuracy with Squareness on all sides within .0001 per inch

Hardened and precision Ground on all 6 sides of each block; Includes Matched pair of 1-2-3 blocks with 23 holes, 5pc of 3/8 -16 Socket Screws, Hex key

Made in China

High Precision: +/- 20 Seconds, 0.0001" per inch

Set contains two angle blocks: one 30°-60°-90° degree block and one 45°-45°-90° degree block

Precision Ground Solid Hardened Steel

Grade 0 gage block supplied with a Mitutoyo certificate of inspection that the block meets American Society of Mechanical Engineers (ASME) B89.1.9-2002 standard for flatness, length, parallelism, and surface finish

High-carbon, high-chrome steel provides high hardness and wear resistance

Rectangular base for accurate wringing

6pcs Adjustable parallel sets

Minimum Measuring Range (Inch): 3/8''; Maximum Measuring Range: 2-1/4''

Length range from 1-3/4" to 5" closed.; case INCLUDED

Product - Workshop-grade set features 10 individual steel blocks of various angles.

Includes - 1, 2, 3, 4, 5, 10, 15, 20, 25, and 30-degree hardened-steel blocks.

Features - 0.25 thickness; Hardened steel material; Precision grinding; +/- 20 Seconds, 0.0001 per inch high precision.

Grade 0 gage block supplied with a Mitutoyo certificate of inspection that the block meets American Society of Mechanical Engineers (ASME) B89.1.9-2002 standard for flatness, length, parallelism, and surface finish

High-carbon, high-chrome steel provides high hardness and wear-resistance

Square base for accurate wringing, to attain a height reference standard, and to make a dedicated inspection jig

Grade AS-2 gage block supplied with a Mitutoyo certificate of inspection that the block meets American Society of Mechanical Engineers (ASME) B89.1.9-2002 standard for flatness, length, parallelism, and surface finish

High-carbon, high-chrome steel provides high hardness and wear-resistance

Rectangular base for accurate wringing

Micrometer inspection gage blocks are sized for use with a Mitutoyo Micro Checker (sold separately)

Grade 0 gage blocks supplied with a Mitutoyo certificate of inspection that the blocks meet American Society of Mechanical Engineers (ASME) B89.1.9

High-carbon, high-chrome steel provides high hardness and wear-resistance

Grade 0 gage blocks supplied with a Mitutoyo certificate of inspection that the blocks meet American Society of Mechanical Engineers (ASME) B89.1.9

High-carbon, high-chrome steel provides high hardness and wear-resistance

Rectangular shape for accurate wringing

Grade 00 gage block supplied with a Mitutoyo certificate of inspection that the block meets American Society of Mechanical Engineers (ASME) B89.1.9-2002 standard for flatness, length, parallelism, and surface finish

Ceramic block for dimensional stability and thermal expansion resistance

Rectangular base for accurate wringing

Calibrated gage block set of nine rectangular blocks measuring 0.0625" to 2.0", for use with the Mitutoyo Micro Checker (sold separately) to inspect micrometers

Blocks (0.0625", 0.100", 0.125", 0.200", 0.250", 0.300", 0.500", 1", and 2") are constructed of high-carbon, high-chrome steel for durability and to minimize length changes

Comes with optical parallel (0.5" thick) for inspecting parallelism and flatness of measuring faces

Grade AS-2 gage blocks supplied with a Mitutoyo certificate of inspection that the blocks meet American Society of Mechanical Engineers (ASME) B89.1.9

High-carbon, high-chrome steel provides high hardness and wear-resistance

Square base for accurate wringing, to attain a height reference standard, and to make a dedicated inspection jig

Size: All are 4 inch long and 1/8 inch wide or thick

Material: Made from high quality tool steel stress relief against distortion, precision ground and hardened

Accuracy: +/- 0.0002 inch in parallelism and height

Grade AS-1 gage block supplied with a Mitutoyo certificate of inspection that the block meets American Society of Mechanical Engineers (ASME) B89.1.9-2002 standard for flatness, length, parallelism, and surface finish

High-carbon, high-chrome steel provides high hardness and wear-resistance

Square base for accurate wringing, to attain a height reference standard, and to make a dedicated inspection jig

Product - Workshop-grade set features 12 individual steel angle gauge block set of various angles.

Carrying case - Hard-shelled carrying case keeps the precision angle block set organized and protected from contaminants.

Includes - 1/4, 1/2, 1, 2, 3, 4, 5, 10, 15, 20, 25, and 30-degree angle gauge block set.

Product: The set features 17 individual steel blocks of various angles, angle range +/-20 inch

Features: Hardened steel material, precision grinding

Application: For precise angular alignment and measurement for grinder and milling applications

For use with square gage blocks

Helps assemble gage blocks into a precision measuring instrument

Includes 27 pieces for assembling gage blocks

[Packing]: 81 Pieces. 9 blocks: .1001-.1009" in .0001" steps; 49 Blocks: .101-.149" in .001" Steps, 19 Blocks: .050-.950" in .050 steps, 4 Blocks: 1-4" in 1" steps

[Material]: Set made of fully seasoned alloy tool steel with hardened to 65 RC to provide both long wear and resistance to stains and rust

[Instructions]: Blocks manufactured under carefully controlled conditions, allowing for the highest degree of accuracy when used at room temperatures of 68 degrees F (20 degrees C). Accuracy unit: millionths of an inch(uinch).