Rockwell Hardness Calibration Test Blocks
Make sure your hardness testers are accurately calibrated. Blocks are marked with their corresponding Rockwell hardness and a serial number.
All blocks come with a calibration certificate traceable to NIST that states they've passed a test for accuracy.
Durometer Hardness Testers
Measure the hardness of flat materials, such as plastic, rubber, and laminate. For more information about durometer scales, please see the bottom of About Rubber.
Style 2 testers have a narrow base for access to confined areas. You can hold them in your hand.
Style 3 testers come with a calibration certificate traceable to NIST that states they've passed a test for accuracy.
Testers with maximum-reading indicator hold the highest reading until reset.
Mount these testers to an optional operating stand (sold separately) to make sure they’re parallel to your sample for accurate readings and repeatability.
Testers | Operating Stands | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Durometer Hardness Scale | Hardness Measuring Range | Measuring Increments | Accuracy | Ht. | Wd. | Dp. | Dia. | Min. Material Thick. | Specifications Met | Features | Each | Each | ||
For Use On Plastic, Rubber, Laminate | ||||||||||||||
Style 1 | ||||||||||||||
| A | 0-100 | 1 | ±1 | 4" | 2 1/4" | 1 3/4" | __ | 1/4" | ASTM D2240 | Maximum-Reading Indicator | 000000 | 000000000 | 00000000 | 000000000 |
| D | 0-100 | 1 | ±1 | 4" | 2 1/4" | 1 3/4" | __ | 1/4" | ASTM D2240 | Maximum-Reading Indicator | 000000 | 00000000 | 00000000 | 00000000 |
Style 2 | ||||||||||||||
| A | 0-100 | 1 | ±1 | 4" | 2 1/4" | 1 3/4" | __ | 1/4" | ASTM D2240 | Maximum-Reading Indicator | 00000000 | 00000000 | 00000000 | 00000000 |
| D | 0-100 | 1 | ±1 | 4" | 2 1/4" | 1 3/4" | __ | 1/4" | ASTM D2240 | Maximum-Reading Indicator | 00000000 | 00000000 | 00000000 | 00000000 |
| O | 0-100 | 1 | ±1 | 4" | 2 1/4" | 1 3/4" | __ | 1/4" | ASTM D2240 | Maximum-Reading Indicator | 00000000 | 00000000 | 00000000 | 00000000 |
| OO | 0-100 | 1 | ±2 | 4" | 2 1/4" | 1 3/4" | __ | 1/4" | ASTM D2240 | __ | 00000000 | 00000000 | 00000000 | 00000000 |
Style 3 | ||||||||||||||
| A | 0-100 | 1 | ±1 | 6 1/8" | 2 1/4" | 1" | __ | 1/4" | ASTM D2240 | __ | 00000000 | 000000 | 00000000 | 00000000 |
| D | 0-100 | 1 | ±1 | 6 1/8" | 2 1/4" | 1" | __ | 1/4" | ASTM D2240 | __ | 00000000 | 000000 | 00000000 | 00000000 |
| O | 0-100 | 1 | ±1 | 6 1/8" | 2 1/4" | 1" | __ | 1/4" | ASTM D2240 | __ | 00000000 | 000000 | 00000000 | 00000000 |
| OO | 0-100 | 1 | ±2 | 6 1/8" | 2 1/4" | 1" | __ | 1/4" | ASTM D2240 | __ | 00000000 | 000000 | 00000000 | 00000000 |
Style 4 | ||||||||||||||
| A | 0-100 | 1 | ±1 | 4 1/2" | __ | __ | 1/2" | 1/4" | __ | Maximum-Reading Indicator | 00000000 | 000000 | 000000 | 00 |
| D | 0-100 | 1 | ±1 | 4 1/2" | __ | __ | 1/2" | 1/4" | __ | Maximum-Reading Indicator | 00000000 | 000000 | 000000 | 00 |
Durometer Hardness Test Block Sets
Confirm your durometer hardness tester is taking accurate readings. Use your tester on these blocks to make sure the durometer readings match the block. The blocks come with a calibration certificate traceable to NIST to ensure their accuracy.
| For Durometer Hardness Scale | Lg. | Wd. | Dp. | Includes | Container Type | Each | |
| A | 2" | 2" | 1/4" | Seven 2" x 2" Test Blocks (Durometer 30A-90A) | Carrying Case | 0000000 | 0000000 |
| D | 2" | 2" | 1/4" | Three 2" x 2" Test Blocks (Durometer 20D-80D) | Carrying Case | 0000000 | 000000 |
| M | 2" | 2" | 1/4" | Seven 2" x 2" Test Blocks (Durometer 30M-90M) | Carrying Case | 0000000 | 000000 |
| OO | 2" | 2" | 1/4" | Three 2" x 2" Test Blocks (Durometer 30OO-70OO) | Carrying Case | 0000000 | 000000 |
Digital Durometer Hardness Testers
Measure the hardness of flat materials with a digital display. For more information about durometer scales, please see the bottom of About Rubber.
These testers come with a calibration certificate traceable to NIST that states they’ve passed a test for accuracy. A maximum-reading indicator holds the highest reading until reset. Use the USB/RS-232 port for direct connection to your PC.
Testers for Shore M durometers take accurate readings on materials as thin as 0.05". Use them to take measurements of areas that are too small for durometer readings with a Shore A scale tester.
Mount the tester to an operating stand (sold separately) to ensure it is perfectly parallel to the sample. This reduces error and gives accurate, repeatable readings.
Testers | Operating Stands | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Durometer Hardness Scale | Hardness Measuring Range | Measuring Increments | Accuracy | Ht. | Wd. | Dp. | Min. Material Thick. | Batteries Included | Features | Each | Each | ||
For Use On Plastic, Rubber, Laminate | |||||||||||||
| A | 0-100 | 0.1 | ±1 | 6 1/8" | 2 1/2" | 1 5/8" | 1/4" | Yes | Maximum-Reading Indicator, Tolerance-Setting High/Low Buttons, USB and RS-232 Connectivity | 00000000 | 000000000 | 00000000 | 000000000 |
| D | 0-100 | 0.1 | ±1 | 6 1/8" | 2 1/2" | 1 5/8" | 1/4" | Yes | Maximum-Reading Indicator, Tolerance-Setting High/Low Buttons, USB and RS-232 Connectivity | 00000000 | 00000000 | 00000000 | 00000000 |
| M | 0-100 | 0.1 | ±4 | 6 1/8" | 2 1/2" | 1 5/8" | 1/16" | Yes | Maximum-Reading Indicator, Tolerance-Setting High/Low Buttons, USB and RS-232 Connectivity | 000000000 | 00000000 | 0000000 | 00000000 |
For Use On Rubber, Foam | |||||||||||||
| OO | 0-100 | 0.1 | ±2 | 6 1/8" | 2 1/2" | 1 5/8" | 1/4" | Yes | Maximum-Reading Indicator, Tolerance-Setting High/Low Buttons, USB and RS-232 Connectivity | 000000000 | 00000000 | 00000000 | 00000000 |
For Use On Rubber | |||||||||||||
| O | 0-100 | 0.1 | ±1 | 6 1/8" | 2 1/2" | 1 5/8" | 1/4" | Yes | Maximum-Reading Indicator, Tolerance-Setting High/Low Buttons, USB and RS-232 Connectivity | 000000000 | 00000000 | 00000000 | 00000000 |
O-Ring Durometer Hardness Testers
Test the hardness of thin and irregularly shaped plastic, rubber, and laminate parts, such as O-rings. These testers can be used on products where the surface area is too small for accurate durometer readings with a standard Shore A tester, such as the rounded surface of O-rings. They include O-ring fixtures that hold five standard-sized O-rings in place during testing. These testers are also capable of measuring materials as thin as 0.05″, about the thickness of a credit card. On the display, they’ll show the highest reading until they’re reset. They include a calibration certificate traceable to NIST that states they’ve passed a test for accuracy.
Use the included test blocks to practice taking accurate measurements at the right pressure against your workpiece. Send your measurement data directly to your PC using the USB port.
| For O-Ring Wd. | For Durometer Hardness Scale | Hardness Measuring Range | Measuring Increments | Accuracy | Min. Material Thick. | Max. Display Rotation Angle | Batteries Included | Features | Includes | Each | |
For Use On Plastic, Rubber, Laminate | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/16", 3/32", 1/8", 3/16", 1/4" | M | 0-100 | 0.1" | ±4 | 1/16" | 270° | Yes | Maximum-Reading Indicator, Tolerance-Setting High/Low Buttons, USB and RS-232 Connectivity | Digital Durometer Hardness Tester for M Hardness Scale, Seven 2" x 2" Test Blocks (Durometer M), Five O-Ring Fixtures, Operating Stand, Set Plug | 0000000 | 000000000 |
| For Durometer Hardness Scale | Hardness Measuring Range | Measuring Increments | Accuracy | Ht. | Wd. | Dp. | Min. Material Thick. | Max. Display Rotation Angle | Batteries Included | Specifications Met | Features | Each | |
For Use On Plastic, Rubber, Laminate | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M | 0-100 | 0.1 | ±4 | 6 1/8" | 2 1/2" | 1 5/8" | 1/16" | 270° | Yes | ASTM D2240 | Maximum-Reading Indicator, Tolerance-Setting High/Low Buttons, USB and RS-232 Connectivity | 000000000 | 000000000 |
| For Durometer Hardness Scale | Hardness Measuring Range | Lg. | Wd. | Dp. | Includes | Container Type | Each | |
| M | 30-90 | 2" | 2" | 1/4" | Seven 2" x 2" Test Blocks (Durometer 30M-90M) | Carrying Case | 0000000 | 0000000 |
Brinell Hardness Calibration Test Blocks
Check your hardness tester for accuracy against a block with a known hardness rating. Each block is tested according to ASTM E10, which checks the hardness at five locations along the block. They include a certificate that lists the block’s actual hardness, as well as each of the five measurements taken during the test. Blocks also include a NIST-traceable certificate that states they’ve passed a test for accuracy.
Each block is marked with their Brinell hardness rating and a serial number.
For technical drawings and 3-D models, click on a part number.
Portable Digital Hardness Testers
Quickly test large parts or metal bar stock with our most precise hardness testers. These testers are portable and can be brought to facilities and jobsites to test items that are too large to move. While some hardness testers only work on one type of metal, these testers work on most metals. They have a rebound hammer that bounces back after impact—the distance it rebounds indicates the hardness of your surface. To obtain accurate readings, steel and other hard metals must be at least 1” thick and aluminum and other soft metals must be at least 3” thick.
Convert your measurements between Rockwell, Vickers, Brinell, or Shore hardness ratings. Your readings will show on a backlit digital display so you can test even in low light. Store up to 100 measurements with their built-in memory or transfer the data to your PC using the USB port.
Probe | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Hardness Measuring Range (For Scale) | Accuracy | Ht. | Wd. | Dia. | Cable Lg. | Min. Material Thick. | Batteries Included | Includes | Each | |
For Use On Aluminum, Brass, Bronze, Copper, Cast Iron, Iron, Alloy Steel, Stainless Steel, Steel | ||||||||||
| Brinell 93-650 Durometer 0-100 (A, D, OO) Leeb 100-950 (D) Rockwell 20-100 (B, C) Vickers 83-976 | ±0.5% | 1 1/4" | 2 7/8" | 3/32" | 58" | 1" | Yes | Carrying Case, Cleaning Brush, Test Block | 0000000 | 000000000 |
Ultrasonic Portable Hardness Testers
Using ultrasonic vibrations, these testers determine hardness without leaving an indent on hardened materials. They only leave minimal damage on softer metal and work on metal as thin as 0.08”. Use the included test block to determine the right amount of force to apply to your probe. To perform a test, press the diamond tip probe into your material and apply consistent pressure for reliable results. These testers are highly precise and convert measurements between Rockwell, Vickers, and Brinell ratings. Measurements are shown on a backlit digital display, so you can read them even in dark or dimly lit areas. Store up to 2,000 readings with their built-in memory or transfer the data to your PC using the USB port. Small enough to carry, take these testers to your material. Their lithium ion (Li-Ion) battery keeps them running for up to six hours before recharging is required. Energy efficiency requirements restrict sales to the listed areas.
NIST calibrated test blocks are included to help you understand how to properly press the probe to your material for an accurate result. The test blocks can also be used to recalibrate the device. These testers must be calibrated to the specific hardness scale and material being tested. They come pre-calibrated with five combinations: aluminum on the Rockwell B scale, brass on the Rockwell B scale, steel on the Rockwell C and B scales, and steel on the Brinell scale.
Probe | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hardness Measuring Range (For Scale) | Accuracy | Ht. | Wd. | Dia. | Cable Lg. | Min. Material Thick. | For Max. Surface Finish, microinch | Batteries Included | Battery Type | Includes | Cannot Be Sold To | Each | |
For Use On Aluminum, Brass, Bronze, Copper, Alloy Steel, Stainless Steel, Steel | |||||||||||||
| Brinell 75-650 Durometer 26-99 (OO) Leeb 170-960 (D) Rockwell 20-100 (A, B, C) Vickers 80-999 | ±3% | 7" | 3 1/8" | 7/8" | 58" | 0.08" | 400 | Yes | Rechargeable | 5 kgf Probe, Carrying Case, Test Block | CA, OR | 0000000 | 000000000 |