API Ring Joint Materials
| Material | Designation | Maximum Hardness Rockwell B | Maximum Hardness Brinell |
| Soft Iron | D | 56 | 90 |
| Low Carbon Steel | S | 68 | 120 |
| 4-6 Chrome | F-5** | 72 | 130 |
| 304 Stainless Steel | S304 | 83 | 160 |
| 316 Stainless Steel | S316 | 83 | 160 |
| 347 Stainless Steel | S347 | 83 | 160 |
| 410 Stainless Steel | S410 | 86 | 170 |
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** F-5 identification designates ASTM Specification A-182 chemical composition requirements only |
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RTJ standard size gaskets are manufactured in accordance with API-6A and ANSI B16.2 specifications and are furnished in stock materials including soft iron, low carbon steel, 4-6 chrome (F5), 304 & 304L, 316 & 316L, 347, 410, Monel, Inconel and Incoloy.
UNLESS OTHERWISE SPECIFIED, GRUV-TITE FORGED SEAMLESS RING JOINT GASKETS
WILL BE FURNISED IN OVAL DESIGN.
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