STOCKIST, MANUFACTURER, SUPPLIER OF ASTM A194 HEX NUTS
ASTM A194 Hex Nuts Specifications
ASTM A194 Hex Nut Specifications
The ASTM A194 Specification covers Carbon, Alloy and Stainless Steel Hex Nuts intended for use in High Pressure and High Temperature Service. Unless otherwise specified, the American National Standard Heavy Hex Series (ANSI B 18.2.2) shall be used. Nuts up to and including 1 inch nominal size shall be UNC Series Class 2B fit. Nuts over 1 inch nominal size shall be either UNC Series Class 2B fit or 8 UN Series Class 2B fit. High strength ASTM A194 Grade 2H nuts are common in the marketplace and are often substituted for ASTM A563 Grade DH nuts due to the limited availability of DH nuts in certain diameters and finishes.
We Presinox Impex are one of the Largest Manufacturer, Stockist, Suppliers, Exporter, Traders, Dealers, Wholesalers of ASTM A194 Hex Nuts in Mumbai, Maharashtra, India.
A194 Grades Hex Nuts:
| ASTM A194 Gr. 2 | Carbon steel heavy hex nuts |
| ASTM A194 Gr. 2H | Quenched & tempered carbon steel heavy hex nuts |
| ASTM A194 Gr. 2HM | Quenched & tempered carbon steel heavy hex nuts, 100% hardness tested |
| ASTM A194 Gr. 4 | Quenched & tempered carbon-molybdenum heavy hex nuts (withdrawn in 2017) |
| ASTM A194 Gr. 7 | Quenched & tempered alloy steel heavy hex nuts |
| ASTM A194 Gr. 7M | Quenched & tempered alloy steel heavy hex nuts, 100% hardness tested |
| ASTM A194 Gr. 7L | Quenched & tempered alloy steel heavy hex nuts, Charpy impact tested |
| ASTM A194 Gr. 8 | Stainless AISI 304 heavy hex nuts |
| ASTM A194 Gr. 8M | Stainless AISI 316 heavy hex nuts |
A194 Hex Nuts Mechanical Properties :
| Grade Identification Marking | Specifications | Materials | Nominal Size, In. | Tempering Temp. °F | Proof Load Stress, ksi | Hardness Rockwell | |
| Min | Max | ||||||
 |
ASTM A194 Grade 2 | Medium Carbon Steel | 1/4 - 4 | 0 | 150 | 159 | 352 |
 |
ASTM A194 Grade 2H | Medium Carbon Steel, Quenched and Tempered | 1/4 - 4 | 850 | 175 | C24 | C38 |
 |
ASTM A194 Grade 2HM | Medium Carbon Steel, Quenched and Tempered | 1/4 - 4 | 1150 | 150 | 159 | 237 |
 |
ASTM A194 Grade 4 | Medium Carbon Alloy Steel, Quenched and Tempered | 1/4 - 4 | 1100 | 175 | C24 | C38 |
 |
ASTM A194 Grade 7 | Medium Carbon Alloy Steel, Quenched and Tempered | 1/4 - 4 | 1100 | 175 | C24 | C38 |
 |
ASTM A194 Grade 7M | Medium Carbon Alloy Steel, Quenched and Tempered | 1/4 - 4 | 1150 | 150 | 159 | 237 |
 |
ASTM A194 Grade 8 | Stainless AISI 304 | 1/4 - 4 | - | 80 | 126 | 300 |
 |
ASTM A194 Grade 8M | Stainless AISI 316 | 1/4 - 4 | - | 80 | 126 | 300 |
The markings shown for all grades of A194 nuts are for cold formed and hot forged nuts.
When nuts are machined from bar stock, the nut must additionally be marked with the letter 'B'.
The letters H and M indicate heat treated nuts.
A194 Hex Nuts Chemical Properties :
| Element | 2, 2H, and 2HM | 4 | 7 and 7M (AISI 4140) | 8 (AISI 304) | 8M (AISI 316) |
| Carbon | 0.40% min | 0.40 - 0.50% | 0.37 - 0.49% | 0.08% max | 0.08% max |
| Manganese | 1.00% max | 0.70 - 0.90% | 0.65 - 1.10% | 2.00% max | 2.00% max |
| Phosphorus, max | 0.0004 | 0.00035 | 0.00035 | 0.00045 | 0.00045 |
| Sulfur, max | 0.0005 | 0.0004 | 0.0004 | 0.0003 | 0.0003 |
| Silicon | 0.40% max | 0.15 - 0.35% | 0.15 - 0.35% | 1.00% max | 1.00% max |
| Chromium | 0.75 - 1.20% | 18.0 - 20.0% | 16.0 - 18.0% | ||
| Nickel | 8.0 - 11.0% | 10.0 - 14.0% | |||
| Molybdenum | 0.20 - 0.30% | 0.15 - 0.25% | 2.00 - 3.00% |