Description
Metline is a specialized manufacturer and supplier of stainless steel 304 hex nuts, along with SS 304 bolts or studs and washers. SS 304 hex nuts are generally manufactured in accordance with DIN Standard 934 or ISO Standard 4032. We can offer fastest delivery for SS 304 hex nuts and SS 304 heavy hex nuts manufactured as per DIN 934, DIN 6923, DIN 1587, DIN 928, DIN 929.
Stainless steel 304(SS304) is the most basic stainless steel known as 18-8 grade with higher chromium and low carbon content. The low carbon content restricts carbide precipitation during welding as well as minimizes its susceptibility to intergranular corrosion. Stainless steel 304L(SS304L) is an extra low-carbon variation of SS304 with a 0.03% maximum carbon content that eliminates carbide precipitation due to welding. Both SS304 and SS304L have excellent resistance to a wide range of atmospheric, chemical and petrochemical, and food industry corrosions. Usually, they can be used in applications with the maximum temperature of 1650°F[900°C] exhibiting good oxidation resistance.
ASTM A194 Nut Grades Available for Production & Supply
| Grade | Material | UNS |
| Number |
| 2H, 2HM | Carbon Steel | – |
| 3 | Type 501 | – |
| 4 | Carbon, Molybdenum Steel | – |
| 6 | Type 410 | S41000 |
| 7, 7M | Type 4140, 4142, 4145, 4140H, 4142H, 4145H | – |
| 8 | Type 304 | S30400 |
| 8M | Type 316 | S31600 |
| 8T | Type 321 | S32100 |
| 16 | Chromium Molybdenum Vanadium | – |
Stainless Steel Nuts
304 (B8), 316 (B8M), 316 L, 316 Ti ,317 L, 310, 321H (B8T), 347H (B8C), SS 410 (B6) , 904 L (UB6) , A453 GR 660 A/B/C & D.
Duplex & Super Duplex Steel Nuts
UNS S31803 / UNS S32205 (F 51), UNS S32750 (F 53), UNS S32760 (F 55), UNS S31254 (SMO 254).
High Nickel Alloys Nuts
Monel 400 , Monel K 500, Incoloy 600, Incoloy 625, Incoloy 800H, Incoloy 825, Incoloy 718 , Inconel X – 750, Alloy 20 (CB 20) , Hastelloy C 276 , Hastelloy C 22, Hastelloy C4.
Other Alloys Nuts
Titanium Gr 2, Titanium Gr 5, Aluminium Bronze (AB 2) , Phosphorous Bronze (PB).
Material Hardness Specification as per ASTM A194
| Grade & Type | Brinell Hardness | Rockwell Hardness |
| C Scale | B Scale |
| 2H to 1-1⁄2 in. or M36, incl. | 248-327 | 24-35 | – |
| 2H over 1-1⁄2 in. or M36 | 212-327 | 35 max | 95 min |
| 2HM and 7M | 159-235 | – | 84 – 99 |
| 3, 4, 7, 16 | 248-327 | 24 – 35 | – |
| 6 | 225-271 | 20-28 | – |
| 8, 8C, 8M, 8T, 8F, 8MLCuN | 126-300 | 32 max | 60 min |
Chemical Composition of Various Materials, as per ASTM A194 Specification
| Grade | Carbon | Manganese | Phosphorous, max | Sulfur, max | Silicon | Chromium | Nickel | Molybdenum | Other Elements |
| 2, 2H and 2 HM | 0.40% min. | 1.00% max. | 0.04% | 0.05% | 0.40% max | | | | |
| 3 | 0.10% min. | 1.00% max. | 0.04% | 0.03% | 1.00% | 4.0-6.0% | | 0.20-0.30% | |
| 4 | 0.40 -0.50% | 0.70-0.90% | 0.04% | 0.04% | 0.15-0.35% | | | 0.20-0.30% | |
| 6 | 0.15% | 1.00% | 0.04% | 0.03% | 1.00% | 11.5-13.5% | | | |
| 6F | 0.15% | 1.25% | 0.06% | 0.06% | 1.00% | 12.0-14.0% | | | Selenium-0.15% min |
| 7 and 7M (AISI 4140) | 0.37-0.49% | 0.65-1.10% | 0.04% | 0.04% | 0.15-0.035% | 0.75-1.20% | | 0.15-0.25% | |
| 8 (AISI 304) | 0.08% | 2.00% max | 0.05% | 0.03% | 1.00% max | 18.0-20.0% | 8.0-11.0% | | |
| 8M (AISI 316) | 0.08% | 2.00% max | 0.05% | 0.30% | 1.00% max | 16.0-18.0% | 10.0-14.0% | 2.00-3.00% | |
| 8C | 0.08% | 2.00% | 0.05% | 0.03% | 1.00% | 17.0-19.0% | 9.0-12.0% | | Columbium and Tantalum – 10x carbon content, min |
| 8T | 0.80% | 2.00% | 0.05% | 0.30% | 1.00% | 17.0-19.0% | 9.0-12.0% | | Titanium-0.70%max, Nitrogen-0.10% |
| 8F | 0.15% | 2.00% | 0.20% | 0.15%min | 1.00% | 17.0-19.0% | 8.0-10.0% | | |
| 8R | 0.06% | 4.0-6.0% | 0.05% | 0.03% | 1.00% | 20.5-23.5% | 11.5-13.5% | 1.50-3.00% | Columbium and Tantalum-0.10-0.30%, Nirogen-0.20-0.40%, Vanadium-0.10-0.30% |
| 8S | 0.10% | 7.0-9.0% | 0.06% | 0.03% | 3.5-4.5% | 16.0-18.0% | 8.0-9.0% | | Nitrogen-0.08-0.18% |
| 16 | 0.36-0.47% | 0.45-0.70% | 0.04% | 0.40% | 0.15-0.35% | 0.80-1.15% | | 0.50-0.65% | Vanadium-0.25-0.35%, Aluminum-0.015% |
