Spi 20-382-8 Hardness Calibration Test Block Leeb D

Product Description

The SPI 20-382-8 is a hardness calibration test block designed for use with Leeb D-type hardness testers. It provides a certified reference surface in the 40 to 45 HRC range, classified as a mild hardness range. Calibration test blocks are essential for verifying the accuracy and repeatability of portable hardness testing instruments before and during field or shop use. This block gives inspectors, quality technicians, and tool-and-die professionals a reliable standard to confirm instrument performance without relying on assumptions or unchecked readings.

This test block is suited for quality control environments, machine shops, metalworking facilities, and any setting where portable Leeb rebound hardness testing is performed. It is used to validate Leeb D-type impact devices prior to testing workpieces such as forgings, castings, and structural steel components. The mild hardness range of 40 to 45 HRC makes it appropriate for verifying instrument response in medium-to-hard steel applications.

Key Features

• Leeb D scale calibration reference covering 40 to 45 HRC
• Mild hardness range classification for medium-to-hard material verification
• Compact block dimensions of 3.56 inches by 2.16 inches by 1 inch for bench or portable use
• Single-unit packaging suitable for individual instrument kits
• Compatible with Leeb D-type impact probe hardness testers

Compatibility

Designed for use with Leeb D-type portable hardness testing instruments requiring a reference test block in the 40 to 45 HRC range.

Installation Notes

Calibration test blocks require no installation but should be handled with care to preserve the reference surface. Keep the test surface clean and free of oils, burrs, and debris before each use. Store the block in its protective case when not in use to prevent surface damage. Calibration procedures should follow the instrument manufacturer guidelines and applicable metrology standards in force at your facility.