Heavy hex nuts
ASTM A194 heavy hex nuts in 2H, 2HM, 4, 7, 7M, 8 and 8M, and in exotic grades to match the stud.
What F and H mean
- FWidth across flats = 1.5d + 1/8 in
- HThickness = d − 1/64 in
Heavy hex nut dimensions
| Nominal size d | Thread | Across flats F | F (mm) | Thickness H (mm) | |
|---|---|---|---|---|---|
| 1/2" | 13 UNC | 7/8" | 22.2 | 12.3 | Quote |
| 5/8" | 11 UNC | 1-1/16" | 27.0 | 15.5 | Quote |
| 3/4" | 10 UNC | 1-1/4" | 31.8 | 18.7 | Quote |
| 7/8" | 9 UNC | 1-7/16" | 36.5 | 21.8 | Quote |
| 1" | 8 UNC | 1-5/8" | 41.3 | 25.0 | Quote |
| 1-1/8" | 8 UN | 1-13/16" | 46.0 | 28.2 | Quote |
| 1-1/4" | 8 UN | 2" | 50.8 | 31.4 | Quote |
| 1-3/8" | 8 UN | 2-3/16" | 55.6 | 34.5 | Quote |
| 1-1/2" | 8 UN | 2-3/8" | 60.3 | 37.7 | Quote |
| 1-5/8" | 8 UN | 2-9/16" | 65.1 | 40.9 | Quote |
| 1-3/4" | 8 UN | 2-3/4" | 69.8 | 44.1 | Quote |
| 1-7/8" | 8 UN | 2-15/16" | 74.6 | 47.2 | Quote |
| 2" | 8 UN | 3-1/8" | 79.4 | 50.4 | Quote |
| 2-1/4" | 8 UN | 3-1/2" | 88.9 | 56.8 | Quote |
| 2-1/2" | 8 UN | 3-7/8" | 98.4 | 63.1 | Quote |
Calculated from the ASME B18.2.2 heavy hex formulas. Basic dimensions; tolerances per the standard.
Have a BOQ or drawing? Get a quotation from the manufacturer.
Send sizes, grades and quantities. Our estimation team usually replies within one working day.
Nut grades
| Grade | Use with |
|---|---|
| A194 2H | B7 studs |
| A194 2HM | B7M studs, sour service |
| A194 4 / 7 | B16 and L7 studs |
| A194 7M | L7M studs |
| A194 8 / 8M | B8 / B8M stainless studs |
Bolt set finder
Bolt set finder
Studs and heavy hex nuts for any number of ASME B16.5 flange joints.
Stud length depends on facing and gasket thickness, so add those in your enquiry.
FAQ
Questions buyers ask
How is heavy hex nut width across flats calculated?
Per ASME B18.2.2, width across flats F is 1.5 times the nominal diameter plus ⅛ inch. A 1 inch heavy hex nut is 1⅝ inch across flats.
Request a quote
Get a quotation from the manufacturer
Send your BOQ, drawing or tender reference. You deal directly with the manufacturer.
- Reply from our estimation team, usually within one working day
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