Best 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

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

81 pc Grade B Steel Gage Block Set with MFG'S certificate

Manufactured under carefully controlled conditions allowing for the highest degrees of accuracy when used at a temperature of 68 degrees F. (20 C).

All gage block sets are assigned serial numbers and accompanied with a certificate of inspection listing the deviation for each block

Made of precision-grade tool steel hardened and ground on all 6 sides of block

Heat treated and case hardened to HRC 57-62

Accuracy and squareness on all sides within .0002"

Perfect for machinists and metalworkers; measure angles with maximum precision

Workshop-grade set features 12 individual steel blocks of various angles

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

[Design]: 23 holes includes 5 holes tapped to 3/8-16 and others untapped Cross drilling design allows for efficient use of lower weight with maximum strength,

[Product includes]: ,Five stainless steel socket head cap screws,One hex key; Fitted Case

[Application]: Perfect for machinists, woodworkers, metalworkers, and more

[Each Set Contains 1 Pair of the Height Listed]: 1/2, 5/8, 3/4, 7/8, 1, 1-1/8, 1-1/4, 1-3/8, 1-1/2 & 1-5/8‘’

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

[Easy Handling]: Easier Handling because there are 2 holes in each one

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

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

81 pc Gage Block Set; Manufacturer Certificate; Grade AS-0

HIGH PRECISION; Manufactured under carefully controlled conditions; Recommended to use at a temperature of 20C (68F)

THOROUGHLY TESTED; Each gage block is tested for accuracy; Set comes with a certificate listing the deviation for each block; Tested according to ASME B89.1.9-2002 Federal Standards

Dimension - 2-3/8 x 2-3/8 x 2 --- 90 degree v-block pair with clamps.

Material - Made of hardened steel,Hardness: hrc 58 to 60.

Square and parallel to accuracy - 0.0002.

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

Can be used for checking spindle wear on outer diameter (OD) micrometers

Sized to check different degrees of spindle rotation

Steel blocks are made from high-carbon, high-chrome steel to reduce wear and corrosion

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

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

[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: uinch.

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

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

Half the total indicated runout (TIR) of competing products, with a .0001” tolerance.

Drilled with 23 holes for great flexibility

5 socket cap bolts and hex key are included

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

Standard 1018 Steel

0.1 0.2 0.3 0.4 0.5inch

size：0.75”*0.75”

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

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

+/- .0002" in Parallelism

Paired +/- .0002" in Height

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

Practical Woodworking Tools: This 5-piece gauge block set allows easy setting of fence and cutter height .

Quick Convenient Measurement: All gauge blocks are marked with engraving to be perfect for quick work and measurements .

Accurate Block Set Size: All 6.35 cm length: 1/8 cm, 0.64 cm, 0.64 cm, 0.95 cm and 0.5 cm square .

Standard 1018 Steel

Dimensions: 12.0" x 4.0" x 1.0"

Weight：6 KG

The whole Gauge Block is processed by good heat treatment, good grinding force. High Precision, stable, durable, not easy to rust. All gage block sets are assigned serial numbers.

Gauge Block is made of high quality steel material, durable to use. Heat treated and hardened steel blocks are ultra strong. Gauge Block is used to calibrate other accuracy of gauge.

32Pcs/set, meet your different choices. Manufactured under carefully controlled conditions allowing for the highest degrees of accuracy when used at a temperature of 68 degrees F. ( 20 C).