ASTM Specifications for Nuts
ASTM Specifications for Nuts
ASTM A194 Specification
Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or both.
ASTM A194 specification covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1/4 through 4 in. and metric M6 through M100 nominal. It also covers austenitic stainless steel nuts in the size range 1/4 in. and M6 nominal and above. These nuts are intended for high-pressure or high-temperature service, or both.
ASTM A194 Nut Grades
| Grade | Tensile Class | Raw Material |
|---|---|---|
| B5 | 4-6% Chromium Ferritic Steel | |
| B6 | 13% Chromium Ferritic Steel | |
| B6X | 13% Chromium Ferritic Steel | |
| B7 | Chromium Molybdenum Alloy Steel, Quenched & Tempered | |
| B7M | Chromium Molybdenum Alloy Steel, Quenched & Tempered | |
| B16 | Chromium-molybdenum-vanadium Alloy Steel, Quenched & Tempered | |
| B8 | Class 1 | AISI 304 Stainless Steel, Carbide Solution Treated |
| B8 | Class 2 | AISI 304 Stainless Steel, Carbide Solution Treated and Strain Hardened |
| B8A | AISI 304 Stainless Steel, Carbide solution treated in the finished condition | |
| B8C | Class 1 | AISI 347 Stainless Steel, Carbide Solution Treated |
| B8C | Class 2 | AISI 347 Stainless Steel, Carbide Solution Treated and Strained Hardened |
| B8CA | AISI 347 Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8M | Class 1 | AISI 316 Stainless Steel, Carbide Solution Treated |
| B8M | Class 2 | AISI 316 Stainless Steel, Carbide Solution Treated and Strain Hardened |
| B8MA | AISI 316 Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8M2 | AISI 316 Stainless Steel, Carbide Solution Treated and Strain Hardened | |
| B8M3 | AISI 316 Stainless Steel, Carbide Solution Treated and Strain Hardened | |
| B8P | Class 1 | AISI 305 Stainless Steel, Carbide Solution Treated |
| B8P | Class 2 | AISI 305 Stainless Steel, Carbide Solution Treated and Strain Hardened |
| B8PA | AISI 305 Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8N | AISI 304N Stainless Steel, Carbide Solution Treated | |
| B8N | AISI 304N Stainless Steel, Carbide Solution Treated and Strain Hardened | |
| B8MLCuN | AISI 304N Stainless Steel, Carbide Solution Treated | |
| B8MLCuN | UNS S31254 Stainless Steel, Carbide Solution Treated and Strain Hardened | |
| B8MLCuNA | UNS S31254 Stainless Steel, Carbide Solution Treated | |
| B8T | Class 1 | AISI 321 Stainless Steel, Carbide Solution Treated |
| B8T | Class 2 | AISI 321 Stainless Steel, Carbide Solution Treated and Strain Hardened |
| B8TA | AISI 321 Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8R | Nitronic 50/UNS S20910 Stainless Steel, Carbide Solution Treated | |
| B8RA | Nitronic 50/UNS S20910 Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8S | Nitronic 60/UNS S21800 Stainless Steel, Carbide Solution Treated | |
| B8SA | Nitronic 60/UNS S21800 Stainless Steel, Carbide Solution Treated | |
| B8LN | AISI 304LN Stainless Steel, Carbide Solution Treated | |
| B8LNA | AISI 304LN Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8MLN | AISI 316LN Stainless Steel, Carbide Solution Treated | |
| B8MLNA | AISI 316LN Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8CLN | AISI 347LN Stainless Steel, Carbide Solution Treated | |
| B8CLNA | AISI 347LN Stainless Steel, Carbide Solution Treated in Finished Condition |
ASTM A194 Chemical Components
| Grade | Material | UNS Number |
C, % | Mn, % | Ph, % | S, % | Si, % | Cr, % | Ni, % | Mo, % | Ti, % | Cb & Ta, % | N, % | Other Elements, % |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Carbon | 0.15 min | 1.000 | 0.040 | 0.050 | 0.400 | - | - | - | - | - | - | - | |
| 2, 2HM, & 2H | Carbon | 0.40 min | 1.000 | 0.040 | 0.050 | 0.400 | - | - | - | - | - | - | - | |
| 2H | Carbon | 0.40 min | 1.000 | 0.040 | 0.050 | 0.400 | - | - | - | - | - | - | - | |
| 2HM | Carbon | 0.40 min | 1.000 | 0.040 | 0.050 | 0.400 | - | - | - | - | - | - | - | |
| 3 | Type 501 | 0.10 min | 1.000 | 0.040 | 0.030 | 1.000 | 4.0-6.0 | - | 0.40-0.65 | - | - | - | - | |
| 4 | carbon, molybdenum | 0.40-0.50 | 0.70-0.90 | 0.035 | 0.040 | 0.15-0.35 | - | 0.20-0.30 | - | - | - | - | ||
| 6 | Type 410 | S41000 | 0.150 | 1.000 | 0.040 | 0.030 | 1.000 | 11.5-13.5 | - | - | - | - | - | - |
| 6F | Type 416 | S416000 | 0.150 | 1.250 | 0.060 | 0.15min | 1.000 | 12.0-14.0 | - | - | - | - | - | |
| 6F | Type 416Se | S41623 | 0.150 | 1.250 | 0.060 | 0.060 | 1.000 | 12.0-14.0 | - | - | - | - | Selenium, 0.15 min | |
| 7, 7M | Type 4140, 4142, 4145, 4140H, 4142H, 4145H | 0.37-0.49 | 0.65-1.10 | 0.035 | 0.040 | 0.15-0.35 | 0.75-1.2 | - | 0.15-0.25 | - | - | - | - | |
| 8 | Type 304 | S30400 | 0.080 | 2.000 | 0.045 | 0.030 | 1.000 | 18.0-20.0 | 8.0-11.0 | - | - | - | - | |
| 8A | Type 304 | 0.080 | 2.000 | 0.045 | 0.030 | 1.000 | 18.0-20.0 | 8.0-11.0 | - | - | - | - | ||
| 8C | Type 347 | S34700 | 0.080 | 2.000 | 0.045 | 0.030 | 1.000 | 17.0-19.0 | 9.0-12.0 | - | 10 x Carbon Content, min | - | - | |
| 8CA | Type 347 | S34700 | 0.080 | 2.000 | 0.045 | 0.030 | 1.000 | 17.0-19.0 | 9.0-12.0 | - | 10 x Carbon Content, min | - | - | |
| 8CLN, 8CLNA | Type 347LN | S34751 | 0.0005-0.020 | 2.000 | 0.045 | 0.030 | 1.000 | 17.0-19.0 | 9.0-13.0 | - | 0.20-0.50, 15 x Carbon Content,min | 0.06-0.10 | - | |
| 8M, 8MA | Type 316 | S31600 | 0.080 | 2.000 | 0.045 | 0.030 | 1.000 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | - | - | - | - |
| 8T, 8TA | Type 321 | S32100 | 0.080 | 2.000 | 0.045 | 0.030 | 1.000 | 17.0-19.0 | 9.0-12.0 | - | 5 x (C+N),Min – 0.70 max | - | 0.100 | - |
| 8F, 8FA | Type 303 | S30300 | 0.150 | 2.000 | 0.200 | 0.150 | 1.000 | 17.0-19.0 | 8.0-10.0 | - | - | - | - | - |
| 8F, 8FA | Type 303 Se | S30323 | 0.150 | 2.000 | 0.200 | 0.06 | 1.000 | 17.0-19.0 | 8.0-10.0 | - | - | - | - | Selenium, 0.15 min |
| 8P, 8PA | Type 305 with restricted carbon | S30500 | 0.080 | 2.000 | 0.045 | 0.030 | 1.000 | 17.0-19.0 | 11.0-13.0 | - | - | - | - | - |
| 8N, 8NA | Type 304N | S30451 | 0.080 | 2.000 | 0.045 | 0.030 | 1.000 | 18.0-20.0 | 8.0-11.0 | - | - | - | 0.10-0.16 | - |
| 8LN, 8LNA | 0.030 | 2.000 | 0.045 | 0.030 | 1.000 | 18.0-20.0 | 8.0-11.0 | - | - | - | 0.10-0.16 | - | ||
| 8MN, 8MNA | Type 316N | S31651 | 0.080 | 2.000 | 0.045 | 0.030 | 1.000 | 16.0-18.0 | 10.0-13.0 | 2.0-3.0 | - | - | 0.10-0.16 | - |
| 8MLN, 8MLNA | Type 316LN | S31653 | 0.030 | 2.000 | 0.045 | 0.030 | 1.000 | 16.0-18.0 | 10.0-13.0 | 2.0-3.0 | - | - | 0.10-0.16 | - |
| 8R, 8RA | XM19 | S20910 | 0.060 | 4.0-6.0 | 0.045 | 0.030 | 1.000 | 20.5-23.5 | 11.5-13.5 | 1.50-3.0 | - | 0.10-0.30 | 0.20-0.40 | Vanadium, 0.10-0.30 |
| 8S, 8SA | S21800 | 0.100 | 7.0-9.0 | 0.060 | 0.030 | 3.5-4.5 | 16.0-18.0 | 8.0-9.0 | - | - | - | 0.08-0.18 | - | |
| 8MLCuN, 8MLCuNA | S31254 | S31254 | 0.020 | 1.000 | 0.030 | 0.010 | 0.800 | 19.5-20.5 | 17.5-18.5 | 6.0-6.5 | - | - | 0.18-0.25 | Copper 0.50-1.00 |
| 9C, 9CA | N08367 | N08367 | 0.030 | 2.000 | 0.040 | 0.030 | 1.000 | 20.0-22.0 | 23.5-25.5 | 6.0-7.0 | - | - | 0.18-0.25 | Copper 0.75 |
| 16 | Chromium Molybdenum Vanadium | 0.36-0.47 | 0.45-0.70 | 0.035 | 0.040 | 0.15-0.35 | 0.80-1.15 | 0.50-0.65 | - | - | - | Vanadium 0.25-0.35 AluminumB 0.015 |
ASTM A194 Hardness Requirement
| Grade & Type | Brinell Hardness | Rockwell Hardness | |
|---|---|---|---|
| C Scale | B Scale | ||
| 2 | 159-352 | - | 84 min |
| 2H | 248-327 | 24-35 | - |
| 2H | 212-327 | 35 max | 95 min |
| 2HM and 7M | 159-235 | - | 84 - 99 |
| 4, 7, 16 | 248-327 | 24 - 35 | - |
| 6 and 6F | 225-271 | 20-28 | - |
| 8, 8C, 8M, 8T, 8F, 8MLCuN | 126-300 | 32 max | 60 min |
| 8A, 8CA, 8MA, 8TA, 8MLCuNA | 126-192 | - | 60 – 90 |
| 8R, 8RA, 8S. 8SA | 183-271 | 25 max | 88 min |
ASTM A194 Proof Load (Inch Series)
| Nominal Size, inch | Threads per inch | Stress Area inch | Proof Load, lbf | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| GRADE 2, 2HM, 6, 6f, 7M | Grade 2H, 4, 7, 16 | All Types of Grade 8 | ||||||||
| Heavy Hex | Hex | Heavy Hex | Hex | Heavy Hex | Hex | |||||
| 1/4" | 20 | 0.0316 | 4130 | 3820 | 4770 | 4300 | 5570 | 4770 | ||
| 5/16" | 18 | 0.0524 | 6810 | 6290 | 7860 | 7070 | 9170 | 7860 | ||
| 3/8" | 16 | 0.0774 | 10080 | 9300 | 11620 | 10460 | 13560 | 11620 | ||
| 7/16" | 14 | 0.1063 | 13820 | 12760 | 15940 | 14350 | 18600 | 15940 | ||
| 1/2" | 13 | 0.1419 | 18450 | 17030 | 21280 | 19160 | 24830 | 21280 | ||
| 9/16" | 12 | 0.1820 | 23660 | 21840 | 27300 | 24570 | 31850 | 27300 | ||
| 5/8" | 11 | 0.2260 | 29380 | 27120 | 33900 | 30510 | 39550 | 33900 | ||
| 3/4" | 10 | 0.3340 | 43420 | 40080 | 50100 | 45090 | 58450 | 50100 | ||
| 7/8" | 9 | 0.4620 | 60060 | 55440 | 69300 | 62370 | 80850 | 69300 | ||
| 1" | 8 | 0.606 | 78780 | 72720 | 90900 | 81810 | 106000 | 90900 | ||
| 1 1/8" | 8 | 0.7900 | 102700 | 94800 | 118500 | 106700 | 138200 | 118500 | ||
| 1 1/4" | 8 | 1.0000 | 130000 | 120000 | 150000 | 135000 | 175000 | 150000 | ||
| 1 3/8" | 8 | 1.2330 | 160200 | 148000 | 185000 | 166500 | 215800 | 185000 | ||
| 1 1/2" | 8 | 1.492 | 194000 | 170040 | 223800 | 201400 | 261100 | 223800 | ||
ASTM A194 Marking
| Grade Type | Hot Forged or Cold Punched Nuts | Nuts Machined from Bar Stock |
|---|---|---|
| 2 | 2 | 2B |
| 2H | 2H | 2HB |
| 2HM | 2HM | 2HMB |
| 4 | 4 | 4B |
| 6 | 6 | 6B |
| 6F | 6F | 6FB |
| 7 | 7 | 7B |
| 7M | 7M | 7MB |
| 7L | 7L | 7LB |
| 8 | 8 | 8B |
| 8M | 8M | 8MB |
| 8C | 8C | 8CB |
| 8T | 8T | 8TB |
| 8F | 8F | 8FB |
| 8R | 8R | 8RB |
| 8S | 8S | 8SB |
| 8MLCuN | 8MLCuN | 8MLCuNB |
| 16 | 16 | 16B |
ASTM Specifications for Nuts Products
ASTM SPECIFICATIONS FOR NUTS PRODUCTS
×