--- title: Hardness Testing Indenters url: https://www.buehler.com/ca/products/hardness-testing/hardness-testing-indenters/ date: 2024-03-21T17:56:55+00:00 modified: 2024-10-31T17:53:58+00:00 lang: en_CA --- # Hardness Testing Indenters # Hardness Testing Indenters [![Hardness Testing Indenters](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/03/0012356_carbide-ball-116in-for-uh250-iso.png)Hardness Testing Indenters](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/03/0012356_carbide-ball-116in-for-uh250-iso.png) ## Indenters Hardness tests can be defined as forcing an indenter of a specified size, shape, and material into the surface of a test piece to obtain a hardness value. The resulting indent is measured by either the depth of penetration or the dimensions of the resulting indentation. Hardness testing plays a vital role in materials testing, quality control, and component acceptance. Buehler provides a complete range of indenters designed for Vickers, Knoop, Rockwell, and Brinell scales. Explore the product groups below for more information. Learn more about hardness testing indenters and their concepts from our experts in our blog post on “[Hardness Testing Concepts](https://www.buehler.com/ca/blog/hardness-testing-concepts/)“. [Shop Indenters Now](https://shop.buehler.com/hardness-accessories#/specFilters=21m!#-!514) #### Ordering Information Please [contact our lab](https://www.buehler.com/ca/contact-lab-canada.php) if you need assistance selecting an appropriate indenter for your application. #### Vickers and Knoop Select one indenter per load cell #### Select Vickers & Knoop Indenter - W3100G01 - Fixed mounting indenter bracket - W3100G02 - Allows the VH3100 indenter to be changed quickly and repeatably. Contact your sales representative to find out if the SnapGrip holder is suitable for your application - W9100687 - ISO and ASTM certified Vickers indenter for use with VH3000, VH1102, VH1202 and VH1150 series - W9100684 - ISO and ASTM certified Knoop indenter, for use with VH3000 and VH1202 series Penetrator Support ![Penetrator Support](https://buehler.com/wp-content/uploads/2024/03/Indenter-Holder-Standard-Holder-SnapGrid-Holder.png) Fixed mounting indenter bracket [Shop Now](https://shop.buehler.com/vh3100-standard-fixed-mounted-indenter-holder) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Penetrator Support ![Penetrator Support](https://buehler.com/wp-content/uploads/2024/03/Indenter-Holder-Standard-Holder-SnapGrid-Holder.png) Allows the VH3100 indenter to be changed quickly and repeatably. Contact your sales representative to find out if the SnapGrip holder is suitable for your application [Shop Now](https://shop.buehler.com/vh3100-snap-grid-indenter-holder) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Vickers Indenter ![Vickers Indenter](https://buehler.com/wp-content/uploads/2024/03/Vickers-Indenter-ISO-and-ASTM-Certified.png) ISO and ASTM certified Vickers indenter for use with VH3000, VH1102, VH1202 and VH1150 series [Shop Now](https://shop.buehler.com/vickers-indenter-ukas) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Knoop Indenter ![Knoop Indenter](https://buehler.com/wp-content/uploads/2024/03/Knoop-Indenter-ISO-and-ASTM-Certified.png) ISO and ASTM certified Knoop indenter, for use with VH3000 and VH1202 series [Shop Now](https://shop.buehler.com/knoop-indenter-ukas) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) \*VH3300 has fixed, mounted indenter included in loadcell assembly. No separate indenter holder is required. #### Rockwell #### Select Rockwell Indenter - 9100401 - Rockwell indenter C scale , 120° diamond cone, ASTM certified - 9100402 - Rockwell indenter C, D, A, N scales, 120° diamond cone, ASTM certified - 9100431 - Rockwell indenter C, A, D scales, 120° diamond cone, ISO and ASTM certified - 9100432 - Rockwell indenter N scales, 120° diamond cone, ISO and ASTM certified - 9100434 - Rockwell indenter C,A,D,N scales, 120° diamond cone, ISO and ASTM certified - 900003405 - Rockwell indenter A scale for Carbides, 120° diamond cone, ASTM certified - 900002015 - Rockwell indenter N scale, 120° diamond cone, ASTM certified - 9100405 - Rockwell indenter 1/16" WC ball with 4 spare balls, ASTM, ISO and JIS certified - 9100406 - Rockwell indenter 1/8" WC ball with 4 spare balls, ASTM, ISO and JIS certified - 9100407 - Rockwell indenter 1/4“ WC ball with 1 spare ball, ASTM, ISO and JIS certified - 9100408 - Rockwell indenter 1/2“ WC ball with 1 spare ball, ASTM, ISO and JIS certified - 9100422 - 1/16“ Diameter WC Balls, 5 pcs, ASTM, ISO and JIS certified - 9100423 - 1/8“ Diameter WC Balls, 5 pcs, ASTM, ISO and JIS certified - 9100424 - 1/4“ Diameter WC Balls, 3 pcs, ASTM, ISO and JIS certified - 9100425 - 1/2“ Diameter WC Ball, 1 pcs, ASTM, ISO and JIS certified - W2100B2 - Brinell indenter 2.5mm WC ball, ASTM, ISO and JIS certified - W2100B5 - Brinell indenter 5mm WC ball, ASTM, ISO and JIS certified - A582143 - Rockwell Regular Kit – includes Rockwell C Indenter, 25 HRC, 63 HRC and 80 HRB test blocks - A58239 - Rockwell Superficial Kit – includes Rockwell N Indenter, 46 HR30N, 80 HR30N and 70 HR30T test blocks - A582144 - Rockwell Twin Kit – includes Rockwell C and N Indenters, 25 HRC, 63 HRC, 80 HRB, 80 HR30N and 70 HR30T test blocks Diamond Indenter ![Diamond Indenter](https://buehler.com/wp-content/uploads/2024/03/0012356_carbide-ball-116in-for-uh250-iso.png) Rockwell indenter C scale , 120° diamond cone, ASTM certified [Shop Now](https://shop.buehler.com/diamond-indenter-rockwell-c-2) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Diamond Indenter ![Diamond Indenter](https://buehler.com/wp-content/uploads/2024/03/0012356_carbide-ball-116in-for-uh250-iso.png) Rockwell indenter C, D, A, N scales, 120° diamond cone, ASTM certified [Shop Now](https://shop.buehler.com/diamond-indenter-rockwell-c) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Rockwell Indenter ![Rockwell Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Rockwell indenter C, A, D scales, 120° diamond cone, ISO and ASTM certified [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Rockwell Indenter ![Rockwell Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Rockwell indenter N scales, 120° diamond cone, ISO and ASTM certified [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Rockwell Indenter ![Rockwell Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Rockwell indenter C,A,D,N scales, 120° diamond cone, ISO and ASTM certified [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Rockwell Indenter ![Rockwell Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Rockwell indenter A scale for Carbides, 120° diamond cone, ASTM certified [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Diamond Indenter ![Diamond Indenter](https://buehler.com/wp-content/uploads/2024/03/0012356_carbide-ball-116in-for-uh250-iso.png) Rockwell indenter N scale, 120° diamond cone, ASTM certified [Shop Now](https://shop.buehler.com/diamond-indenter-rockwell-n) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Carbide Ball Indenter ![Carbide Ball Indenter](https://buehler.com/wp-content/uploads/2024/03/0012356_carbide-ball-116in-for-uh250-iso.png) Rockwell indenter 1/16" WC ball with 4 spare balls, ASTM, ISO and JIS certified [Shop Now](https://shop.buehler.com/carbide-ball-indenter-116in) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Carbide Ball Indenter ![Carbide Ball Indenter](https://buehler.com/wp-content/uploads/2024/03/0012356_carbide-ball-116in-for-uh250-iso.png) Rockwell indenter 1/8" WC ball with 4 spare balls, ASTM, ISO and JIS certified [Shop Now](https://shop.buehler.com/carbide-ball-indenter-18in) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Carbide Ball Indenter ![Carbide Ball Indenter](https://buehler.com/wp-content/uploads/2024/03/0012356_carbide-ball-116in-for-uh250-iso.png) Rockwell indenter 1/4“ WC ball with 1 spare ball, ASTM, ISO and JIS certified [Shop Now](https://shop.buehler.com/carbide-ball-indenter-14in) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Carbide Ball Indenter ![Carbide Ball Indenter](https://buehler.com/wp-content/uploads/2024/03/0012356_carbide-ball-116in-for-uh250-iso.png) Rockwell indenter 1/2“ WC ball with 1 spare ball, ASTM, ISO and JIS certified [Shop Now](https://shop.buehler.com/carbide-ball-indenter-12in) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Carbide Balls ![Carbide Balls](https://buehler.com/wp-content/uploads/2024/03/0012356_carbide-ball-116in-for-uh250-iso.png) 1/16“ Diameter WC Balls, 5 pcs, ASTM, ISO and JIS certified [Shop Now](https://shop.buehler.com/carbide-balls-116-in) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Carbide Balls ![Carbide Balls](https://buehler.com/wp-content/uploads/2024/03/0012356_carbide-ball-116in-for-uh250-iso.png) 1/8“ Diameter WC Balls, 5 pcs, ASTM, ISO and JIS certified [Shop Now](https://shop.buehler.com/carbide-balls-18-in) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Carbide Balls ![Carbide Balls](https://buehler.com/wp-content/uploads/2024/03/0012356_carbide-ball-116in-for-uh250-iso.png) 1/4“ Diameter WC Balls, 3 pcs, ASTM, ISO and JIS certified [Shop Now](https://shop.buehler.com/carbide-balls-14-in) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Carbide Balls ![Carbide Balls](https://buehler.com/wp-content/uploads/2024/03/0012356_carbide-ball-116in-for-uh250-iso.png) 1/2“ Diameter WC Ball, 1 pcs, ASTM, ISO and JIS certified [Shop Now](https://shop.buehler.com/carbide-balls-12-in) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Brinell Indenter ![Brinell Indenter](https://buehler.com/wp-content/uploads/2024/03/Brinell-Indenters.png) Brinell indenter 2.5mm WC ball, ASTM, ISO and JIS certified [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Brinell Indenter ![Brinell Indenter](https://buehler.com/wp-content/uploads/2024/03/Brinell-Indenters.png) Brinell indenter 5mm WC ball, ASTM, ISO and JIS certified [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Accessory kit for Rockwell Regular scales ![Accessory kit for Rockwell Regular scales](https://buehler.com/wp-content/uploads/2024/03/Rockwell-Regular-Scale-Accessory-Kit.png) Rockwell Regular Kit – includes Rockwell C Indenter, 25 HRC, 63 HRC and 80 HRB test blocks [Shop Now](https://shop.buehler.com/rockwell-regular-scale-accessory-kit) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Rockwell Superficial Scale Accessory Kit ![Rockwell Superficial Scale Accessory Kit](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Rockwell Superficial Kit – includes Rockwell N Indenter, 46 HR30N, 80 HR30N and 70 HR30T test blocks [Shop Now](https://shop.buehler.com/rockwell-superficial-scale-accessory-kit) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Rockwell Twin Scale Accessory Kit ![Rockwell Twin Scale Accessory Kit](https://buehler.com/wp-content/uploads/2024/03/Hardness-Testing-Accessories.png) Rockwell Twin Kit – includes Rockwell C and N Indenters, 25 HRC, 63 HRC, 80 HRB, 80 HR30N and 70 HR30T test blocks [Shop Now](https://shop.buehler.com/rockwell-twin-scale-accessory-kit) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Rockwell indenters fit on R574, RH2150, RB2000, and Wilson legacy testers. \*C, D, and A scales refer to regular Rockwell scales, N scales refer to superficial Rockwell scales. \*\* WC = tungsten carbide **Rockwell Verification Kits** Kits include recommended indenter and blocks for the dedicated scales #### Brinell #### Select Brinell Indenter - 9110123 - Indenter 10mm Carbide Ball with certificate - 9110122 - Indenter 5mm Carbide Ball with certificate - 9110121 - Indenter 2.5mm Carbide Ball with certificate - 900000485 - 10mm Carbide Ball with NVLAP certificate (Qty 2)\*\* - 900000595 - 5mm Carbide Ball with NVLAP certificate (Qty 2)\*\* - 900007350 - 10mm Ball Retainer, MJ, L, K, KDR, AP, & CLB3\*\* - W741237 - 1mm Brinell ball indenter, ISO & ASTM Certified\* - W741238 - 2.5mm Brinell ball indenter, ISO & ASTM Certified\* Carbide Ball Indenter ![Carbide Ball Indenter](https://buehler.com/wp-content/uploads/2024/03/Carbide-Ball-Indenter.png) Indenter 10mm Carbide Ball with certificate [Shop Now](https://shop.buehler.com/carbide-ball-indenter-10mm) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Carbide Ball Intenter ![Carbide Ball Intenter](https://buehler.com/wp-content/uploads/2024/03/Carbide-Ball-Indenter.png) Indenter 5mm Carbide Ball with certificate [Shop Now](https://shop.buehler.com/carbide-ball-indenter-5mm) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Carbide Ball Indenter ![Carbide Ball Indenter](https://buehler.com/wp-content/uploads/2024/03/Carbide-Ball-Indenter.png) Indenter 2.5mm Carbide Ball with certificate [Shop Now](https://shop.buehler.com/carbide-ball-indenter-25mm) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Carbide Ball ![Carbide Ball](https://buehler.com/wp-content/uploads/2024/03/Carbide-Ball-Indenter.png) 10mm Carbide Ball with NVLAP certificate (Qty 2)\*\* [Shop Now](https://shop.buehler.com/carbide-ball-10mm) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Carbide Ball ![Carbide Ball](https://buehler.com/wp-content/uploads/2024/03/Carbide-Ball-Indenter.png) 5mm Carbide Ball with NVLAP certificate (Qty 2)\*\* [Shop Now](https://shop.buehler.com/carbide-ball-5mm) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Retainer ![Retainer](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) 10mm Ball Retainer, MJ, L, K, KDR, AP, & CLB3\*\* [Shop Now](https://shop.buehler.com/retainer-10mm-ball-brinell-tst) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Brinell Indenter ![Brinell Indenter](https://buehler.com/wp-content/uploads/2024/03/Brinell-Indenters.png) 1mm Brinell ball indenter, ISO & ASTM Certified\* [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Brinell Indenter ![Brinell Indenter](https://buehler.com/wp-content/uploads/2024/03/Brinell-Indenters.png) 2.5mm Brinell ball indenter, ISO & ASTM Certified\* [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Includes indenter carbide ball with certificate. \*Indenters certified for use for VH3000 Series hardness testers. \*\*Products only available in North America & South America #### Universal #### Select Universal Indenter - W4100K - Knoop Indenter with turret adapter - W4100V - Vickers Indenter with turret adapter - W4100B1 - Brinell Indenter 1mm with turret adapter - W4100B2 - Brinell Indenter 2.5mm with turret adapter - W4100B5 - Brinell Indenter 5mm with turret adapter - W4100B10 - Brinell Indenter 10mm with turret adapter - W4100R120 - Rockwell Diamond Cone Indenter - W4100R16 - Rockwell Indenter 1/16” Ball - W4100R8 - Rockwell Indenter 1/8” Ball - W4100R4 - Rockwell Indenter 1/4” Ball - W4100R2 - Rockwell Indenter 1/2” Ball Universal Indenter ![Universal Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Knoop Indenter with turret adapter [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Universal Indenter ![Universal Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Vickers Indenter with turret adapter [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Universal Indenter ![Universal Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Brinell Indenter 1mm with turret adapter [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Universal Indenter ![Universal Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Brinell Indenter 2.5mm with turret adapter [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Universal Indenter ![Universal Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Brinell Indenter 5mm with turret adapter [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Universal Indenter ![Universal Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Brinell Indenter 10mm with turret adapter [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Universal Indenter ![Universal Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Rockwell Diamond Cone Indenter [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Universal Indenter ![Universal Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Rockwell Indenter 1/16” Ball [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Universal Indenter ![Universal Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Rockwell Indenter 1/8” Ball [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Universal Indenter ![Universal Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Rockwell Indenter 1/4” Ball [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) Universal Indenter ![Universal Indenter](https://www.buehler.com/ca/wp-content/uploads/sites/3/2021/10/no-image.jpg) Rockwell Indenter 1/2” Ball [Shop Now](https://www.buehler.com/ca/buehler-request-a-quote-canada.php) [Contact Us](https://www.buehler.com/ca/contact-lab-canada.php) UH4000 series testers allow for indenter options in Vickers, Knoop, Rockwell, and Brinell scales. Item numbers include turret adapters when applicable #### Product Literature [![Test Block Application Guide](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/10/Test-Block-Application-Guide_10-31-2024.png)](https://www.buehler.com/assets/Brochures/English/Hardness/FN01526_Test_Block_Guide_EN_Web.pdf) [Test Block Application Guide](https://www.buehler.com/assets/Brochures/English/Hardness/FN01526_Test_Block_Guide_EN_Web.pdf) [![Hardness Testing Catalog](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/03/Hardness-Catalog-Cover.jpg)](https://www.buehler.com/assets/Brochures/English/Hardness/2021-Hardness-Testing-Catalog.pdf) [Hardness Testing Catalog](https://www.buehler.com/assets/Brochures/English/Hardness/2021-Hardness-Testing-Catalog.pdf) [![Buehler Product Catalog](https://www.buehler.com/ca/wp-content/uploads/sites/3/2023/08/Buehler-Product-Catalog_default_600x782.jpg)](https://en.calameo.com/buehler/read/00639329103cfc405df2c) [Buehler Product Catalog](https://en.calameo.com/buehler/read/00639329103cfc405df2c) #### Related Products [![Rockwell Hardness Test Blocks](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/03/Hardness-Test-Blocks.png)](https://www.buehler.com/ca/products/hardness-testing/hardness-testing-blocks/) [Test Blocks](https://www.buehler.com/ca/products/hardness-testing/hardness-testing-blocks/) Available in a wide range that set the standard for industry [![Self Leveling Vise](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/03/0013215_6x-self-leveling-vise-for-round-samples-wo-insert.png)](https://www.buehler.com/ca/products/hardness-testing/hardness-testing-sample-holders-and-anvils/) [Sample Holders](https://www.buehler.com/ca/products/hardness-testing/hardness-testing-sample-holders-and-anvils/) Find sample support that’s right for your application [![Anti Vibration Table](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/03/anti-vibration-table.png)](https://www.buehler.com/ca/products/hardness-testing/wilson-hardness-testing-accessories/) [Accessories](https://www.buehler.com/ca/products/hardness-testing/wilson-hardness-testing-accessories/) Enhance your machine with accessories that meet your tailored application [![](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/03/VH3000-All-in-one.png)](https://www.buehler.com/ca/products/hardness-testing/) [Hardness Testers](https://www.buehler.com/ca/products/hardness-testing/) View our complete offering of hardness testing solutions ##### Proper Indent Spacing During indentation of a test block, the immediate material surrounding an indentation often sees increased hardness due to residual stress and work hardening. Indenting too close to the piece’s edge can result in inadequate material to control deformation, leading to inaccurate hardness readings. Adhering to defined standards prevents such errors. ###### Vickers **According to ASTM Standards:** The distance between two indents or an indent and the edge of the test piece shall be at least two and a half times the diagonal (dV) of the indentation. ![Vickers ASTM Indent Spacing](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/03/Vickers-ASTM-Indent-Spacing-1024x480.png) **According to ISO Standards:** The distance between the centers of two indents shall be at least three times the diagonal (dV) of the indent for steel, copper, and copper alloys, and at least six times for light metals, lead, and tin, and their alloys. The distance between the center of an indent and the edge of the test piece shall be at least two and a half times the diagonal (dV0 for steel, copper, and copper alloys, and at least three times for light metals, lead and tin and their alloys. ![Vickers ISO Indent Spacing](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/03/Vickers-ISO-Indent-Spacing-1024x480.png) ###### Knoop **According to ASTM Standards:** The distance between two indents shall be at least two times the diagonal (dK) of the indentation and two and a half times the width (dW) of the indentation. The distance between the center of an indentation and the edge of a test piece shall be at least one diagonal (dK) or two and a half times the width (dW) of the indentation. ![Knoop ASTM Indent Spacing](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/03/Knoop-ASTM-Indent-Spacing-1024x476.png) ![Knoop ISO Indent Spacing](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/03/Knoop-ISO-Indent-Spacing-1024x476.png) ###### Rockwell and Brinell **According to ASTM and ISO Standards:** The distance between the centers of two adjacent indentations shall be at least three times the diameter (d) of the indentations. The distance from the center of any indentation to an edge of the test piece shall be at least two and a half time the diameter of the indentation. **According to ISO Standards:** The distance between two indents shall be at least two times the diagonal (dK) of the indentation and three and a half times the width (dW) of the indentation. The distance between the center of an indentation and the edge of a test piece shall be at least one diagonal (dK) or three and a half times the width (dW) of the indentation. ![Rockwell Indent Spacing](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/03/Rockwell-Indent-Spacing-1024x480.png) ![Full Lab Metallography Solutions](https://www.buehler.com/ca/wp-content/uploads/sites/3/2024/02/Dr-Mike-Keeble.jpg) Find Your Solutions ###### Full Lab Metallography Solutions Looking for more information from us? Browse through our Solutions section to view technical articles, find recommended processing methods, look at industry solutions, and more. [Solutions by Industry](https://www.buehler.com/ca/solutions/buehler-solutions/solutions-by-industry/) [Solutions by Material](https://www.buehler.com/ca/solutions/buehler-solutions/methods-by-material/) Need Additional Help? Do you want to improve your process? 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