Calibration Bars | McMaster-Carr

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Specifications Met Specifications Met

ASME

ASTM

	Hardness Hardness

	Height Height

9/16"

1 1/2"

	Hardness Scale Hardness Scale

	Manufacturer Model Number Manufacturer Model Number

	Number of Holes Number of Holes

	Hole Style Hole Style

Unthreaded

Threaded

Counterbored

	Total Number of Holes Total Number of Holes

	Hole Thread Size Hole Thread Size

5/16"-18

3/8"-16

5/8"-11

	Hole Diameter Hole Diameter

389 Products

Measuring and Inspecting

Gauge Blocks

Vital for dimensional quality control, these gauge blocks are often used for precision layout, machine setup, and producing close-tolerance dies and fixtures.

Mitutoyo Gauge Block Sets with Calibration Certificate

These sets come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy.

Mitutoyo Gauge Block Sets

Use these Mitutoyo gauge block sets for precision layout, machine setup, and producing close-tolerance dies and fixtures.

Starrett Gauge Block Sets

Use these Starrett gauge block sets for precision layout, machine setup, and producing close-tolerance dies and fixtures.

Economy Gauge Block Sets

Use these gauge block sets for precision layout, machine setup, and producing close-tolerance dies and fixtures.

Angle Block Sets

Create and check angles with these precision-ground blocks. Each block is labeled with its angle.

Individual Test Bars for Brinell Hardness Testers

Slide these bars into a Brinell hardness tester to determine the hardness of very hard steel.

Rockwell Hardness Calibration Test Blocks

Make sure your hardness testers are accurately calibrated.

Setup Blocks

Use these tight-tolerance blocks as mounting bases and supports to ensure accurate angles and spacing.