ASTM A194 Grade 8MLCuN Nuts
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 Grade 8MLCuN Nut
| Grade | Tensile Class | Raw Material |
|---|
ASTM A194 Grade 8MLCuN Chemical Components
| Grade | Material | UNS Number |
C, % | Mn, % | Ph, % | S, % | Si, % | Cr, % | Ni, % | Mo, % | Ti, % | Cb & Ta, % | N, % | Other Elements, % |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 8MLCuN | 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 |
ASTM A194 Grade 8MLCuN Hardness Requirement
| Grade & Type | Brinell Hardness | Rockwell Hardness | |
|---|---|---|---|
| C Scale | B Scale | ||
| 8MLCuN | 126-300 | 32 max | 60 min |
ASTM A194 Grade 8MLCuN Proof Load (Inch Series)
| Nominal Size, inch | Threads per inch | Stress Area inch | Proof Load, lbf | |
|---|---|---|---|---|
| All Types of Grade 8 | ||||
| Heavy Hex | Hex | |||
| 1/4" | 20 | 0.0316 | 5570 | 4770 |
| 5/16" | 18 | 0.0524 | 9170 | 7860 |
| 3/8" | 16 | 0.0774 | 13560 | 11620 |
| 7/16" | 14 | 0.1063 | 18600 | 15940 |
| 1/2" | 13 | 0.1419 | 24830 | 21280 |
| 9/16" | 12 | 0.1820 | 31850 | 27300 |
| 5/8" | 11 | 0.2260 | 39550 | 33900 |
| 3/4" | 10 | 0.3340 | 58450 | 50100 |
| 7/8" | 9 | 0.4620 | 80850 | 69300 |
| 1" | 8 | 0.606 | 106000 | 90900 |
| 1 1/8" | 8 | 0.7900 | 138200 | 118500 |
| 1 1/4" | 8 | 1.0000 | 175000 | 150000 |
| 1 3/8" | 8 | 1.2330 | 215800 | 185000 |
| 1 1/2" | 8 | 1.492 | 261100 | 223800 |
ASTM A194 Grade 8MLCuN Marking
| Grade Type | Hot Forged or Cold Punched Nuts | Nuts Machined from Bar Stock |
|---|---|---|
| 8MLCuN | 8MLCuN | 8MLCuNB |
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