The table below lists the dimensions catalogued for low and high cap (acorn) nuts, inch under SAE J483. The scope of SAE J483 itself is not summarised here — where a figure matters, confirm it against the published document.
SAE J483 — Scope
The table below lists the dimensions catalogued for low and high cap (acorn) nuts, inch under SAE J483. The scope of SAE J483 itself is not summarised here — where a figure matters, confirm it against the published document.
Tolerance & Product Grades
Product grade is a concept from dimensional fastener standards and does not apply to SAE J483. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by SAE J483
| Size | Type | Threads per inch | Width across flats s (in) | A (in) | Nut height m (in) | Q (in) | U (in) | Reference standard |
|---|---|---|---|---|---|---|---|---|
| #6 | Low cap nuts | 32 | 0.312 | 0.3 | 0.34 | 0.16 | 0.16 | SAE J483 |
| #8 | Low cap nuts | 32 | 0.312 | 0.3 | 0.34 | 0.16 | 0.16 | SAE J483 |
| #10 | Low cap nuts | 24 | 0.375 | 0.36 | 0.41 | 0.19 | 0.19 | SAE J483 |
| #12 | Low cap nuts | 24 | 0.375 | 0.36 | 0.41 | 0.19 | 0.22 | SAE J483 |
| 1/4" | Low cap nuts | 20 | 0.438 | 0.41 | 0.47 | 0.22 | 0.25 | SAE J483 |
| 5/16" | Low cap nuts | 18 | 0.5 | 0.47 | 0.53 | 0.25 | 0.31 | SAE J483 |
| 3/8" | Low cap nuts | 16 | 0.562 | 0.53 | 0.62 | 0.28 | 0.38 | SAE J483 |
| 7/16" | Low cap nuts | 14 | 0.625 | 0.59 | 0.69 | 0.31 | 0.44 | SAE J483 |
| 1/2" | Low cap nuts | 13 | 0.75 | 0.72 | 0.81 | 0.38 | 0.5 | SAE J483 |
| 9/16" | Low cap nuts | 12 | 0.875 | 0.84 | 0.94 | 0.44 | 0.56 | SAE J483 |
| 5/8" | Low cap nuts | 11 | 0.938 | 0.91 | 1 | 0.47 | 0.62 | SAE J483 |
| 3/4" | Low cap nuts | 10 | 1.062 | 1.03 | 1.16 | 0.53 | 0.75 | SAE J483 |
| 7/8" | Low cap nuts | 9 | 1.25 | 1.22 | 1.36 | 0.62 | 0.88 | SAE J483 |
| 1" | Low cap nuts | 8 | 1.438 | 1.41 | 1.55 | 0.72 | 1 | SAE J483 |
| 1 1/8" | Low cap nuts | 7 | 1.625 | 1.59 | 1.75 | 0.81 | 1.12 | SAE J483 |
| 1 1/4" | Low cap nuts | 7 | 1.812 | 1.78 | 1.95 | 0.91 | 1.25 | SAE J483 |
| #6 | High cap nuts | 32 | 0.312 | 0.3 | 0.42 | 0.17 | 0.19 | SAE J483 |
| #8 | High cap nuts | 32 | 0.312 | 0.3 | 0.42 | 0.17 | 0.19 | SAE J483 |
| #10 | High cap nuts | 24 | 0.375 | 0.36 | 0.52 | 0.2 | 0.25 | SAE J483 |
| #12 | High cap nuts | 24 | 0.375 | 0.36 | 0.52 | 0.2 | 0.28 | SAE J483 |
| 1/4" | High cap nuts | 20 | 0.438 | 0.41 | 0.59 | 0.23 | 0.31 | SAE J483 |
| 5/16" | High cap nuts | 18 | 0.5 | 0.47 | 0.69 | 0.28 | 0.38 | SAE J483 |
| 3/8" | High cap nuts | 16 | 0.562 | 0.53 | 0.78 | 0.31 | 0.47 | SAE J483 |
| 7/16" | High cap nuts | 14 | 0.625 | 0.59 | 0.88 | 0.34 | 0.53 | SAE J483 |
| 1/2" | High cap nuts | 13 | 0.75 | 0.72 | 1.03 | 0.42 | 0.62 | SAE J483 |
| 9/16" | High cap nuts | 12 | 0.875 | 0.84 | 1.19 | 0.48 | 0.69 | SAE J483 |
| 5/8" | High cap nuts | 11 | 0.938 | 0.91 | 1.28 | 0.53 | 0.78 | SAE J483 |
| 3/4" | High cap nuts | 10 | 1.062 | 1.03 | 1.45 | 0.59 | 0.94 | SAE J483 |
| 7/8" | High cap nuts | 9 | 1.25 | 1.22 | 1.72 | 0.7 | 1.09 | SAE J483 |
| 1" | High cap nuts | 8 | 1.438 | 1.41 | 1.97 | 0.81 | 1.25 | SAE J483 |
| 1 1/8" | High cap nuts | 7 | 1.625 | 1.59 | 2.22 | 0.92 | 1.41 | SAE J483 |
| 1 1/4" | High cap nuts | 7 | 1.812 | 1.78 | 2.47 | 1.03 | 1.56 | SAE J483 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Low and High Cap (Acorn) Nuts, Inch page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify SAE J483
Choose SAE J483 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for low and high cap (acorn) nuts, inch.
Custom manufacturing · Made to drawing
Need a nut to this standard in a non-standard size?
Parts built to SAE J483 are already in the catalog, so a special is usually a variation on existing tooling rather than a new design — which is what keeps the cost down. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
