Finished Pattern Nuts
SAE J995 Grade 2, ASTM A563
SAE J995 Grade 5, ASTM A563
SAE J995 Grade 8, ASTM A563
Grade L9
Plain = NF020----
Plain = NF050----
Plain = NF080----
Zinc = NF020----Z1
Zinc = NF050----Z1
Zinc = NF080----Z1
Zinc = NF090----Z1
Jam Pattern Nuts
SAE J995 Grade 2, ASTM A563
Plain = NJ020----
Zinc = NJ020----Z1
| Nominal Size | Coarse Thread | Fine Thread | F | C | H | Full Nut Weight Per C | H | Jam Nut Weight Per C | |
| Width Across Flats | Width Across Corners | Thickness Hex Nut | Thickness Jam Nut | ||||||
| Basic | Max | Min | |||||||
| 1/4 | 20 | 28 | 7/16 | 0.505 | 0.488 | 7/32 | .7 | 5/32 | .52 |
| 5/16 | 18 | 24 | 1/2 | 0.577 | 0.557 | 17/64 | 1.1 | 3/16 | .77 |
| 3/8 | 16 | 24 | 9/16 | 0.650 | 0.628 | 21/64 | 1.6 | 7/32 | 1.05 |
| 7/16 | 14 | 20 | 11/16 | 0.794 | 0.768 | 3/8 | 2.8 | 1/4 | 1.86 |
| 1/2 | 13 | 20 | 3/4 | 0.866 | 0.840 | 7/16 | 3.8 | 5/16 | 2.62 |
| 9/16 | 12 | 18 | 7/8 | 1.010 | 0.982 | 31/64 | 5.8 | 5/16 | 3.68 |
| 5/8 | 11 | 18 | 15/16 | 1.083 | 1.083 | 35/64 | 7.3 | 3/8 | 4.93 |
| 3/4 | 10 | 16 | 1-1/8 | 1.299 | 1.240 | 41/64 | 11.9 | 27/64 | 7.70 |
| 7/8 | 9 | 14 | 1-5/16 | 1.516 | 1.447 | 3/4 | 19.0 | 31/64 | 12.00 |
| 1 | 8 | 14 | 1-1/2 | 1.732 | 1.653 | 55/64 | 28.3 | 35/64 | 17.6 |
| 1-1/8 | 7 | 12 | 1-11/16 | 1.949 | 1.859 | 31/32 | 40.3 | 39/64 | 24.7 |
| 1-1/4 | 7 | 12 | 1-7/8 | 2.165 | 2.066 | 1-1/16 | 54.3 | 23/32 | 36.1 |
| 1-3/8 | 6 | 12 | 2-1/16 | 2.382 | 2.273 | 1-11/64 | 73.0 | 25/32 | 47.90 |
| 1-1/2 | 6 | 12 | 2-1/4 | 2.598 | 2.480 | 1-9/32 | 94.3 | 27/32 | 60.90 |
| 1-5/8 | 5 | 12 | 2 7/16 | 1-25/64 | 117 | ||||
| 1-3/4 | 5 | 12 | 2-5/8 | 1-1/2 | 151 | ||||
| 1 7/8 | 5 | 12 | 2-3/4 | 1-3/4 | 204 | ||||
| 2 | 4.5 | 12 | 3 | 1-23/32 | 224 | ||||
| 2 1/4 | 4.5 | 12 | 3-3/8 | 1-59/64 | 317 | ||||
| 2 1/2 | 4 | 12 | 3-3/4 | 2-9/64 | 435 | ||||
| 2 3/4 | 4 | 12 | 4-1/8 | 2-23/64 | 5473 | ||||
| 3 | 4 | 12 | 4-1/2 | 2-37/64 | 740 | ||||
Dimensional specifications per ASME B18.2.2
Disclaimer: The dimensions listed are for reference only. Sizes not listed may be available off the shelf or can be manufactured to customer requirements.