SAE Grade 5 Serrated Flange Nuts (Inch Series)
Inch-series serrated flange nuts rated SAE Grade 5 — 1/4" through 3/4" nominal in UNC coarse and UNF fine pitches, with a load-spreading flange whose serrations bite the bearing surface for mild vibration resistance. The metric counterpart is DIN 6923.
Last updated: 2026-11
Specifications
This is the inch-series, grade-specified member of the serrated flange nut family: a one-piece nut whose built-in flange spreads the clamp load so no separate washer is needed, while conical serrations under the flange bite into the material for mild vibration resistance. The collected inch table runs 1/4"-20 through 3/4"-16 in SAE Grade 5, with fine-pitch (UNF) variants at every size — a 1/2"-13 nut, for example, spans 3/4" across flats at a 1 1/32" flange diameter and 0.05" flange thickness. The nut is reusable without sacrificing strength, but the serrations can mar the mounting surface, and the mating screw should carry a comparable strength rating so the threads are not stripped during installation. For metric drawings, see the DIN 6923 serrated flange nut page.
| Standard | SAE Grade 5 serrated flange nuts, inch series — UNC coarse and UNF fine pitch variants |
|---|---|
| Size range | 1/4" through 3/4", coarse (UNC) and fine (UNF) pitches |
| Dimensions at 1/2"-13 | Width across flats 3/4"; height 29/64"; flange diameter 1 1/32"; flange thickness 0.05" |
| Locking mechanism | Teeth on the flange bite into the bearing surface and resist back-off |
| Bearing face | Built-in flange spreads the load like an integrated washer |
| Grade pairing | SAE Grade 5, medium strength — use a screw with a comparable strength rating to avoid stripped threads |
| Surface note | Flange teeth mar the mating surface |
| Finishes | Zinc-plated steel, zinc-yellow-chromate-plated steel, black-oxide steel, plain steel |
Materials
- Steel
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (SAE Grade 5 Serrated Flange Nuts (Inch Series)) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
What does the SAE Grade 5 rating on these flange nuts mean for bolt selection?
It is the medium-strength class of the inch system. The supply-side guidance is direct: to avoid stripped threads during installation, make sure the screw has a comparable strength rating — a Grade 5 flange nut belongs with a Grade 5-class bolt, not with a soft low-carbon screw under high clamp load. The flange then does its two jobs on the joint: it spreads the load without a separate washer, and its serrations hold the assembly against mild vibration — at the cost of marking the mounting surface.
What is the MOQ and lead time for this nut type?
The minimum order quantity is 10,000 pieces. Stock items ship in 3–7 days; non-stock items are confirmed at quotation. Common diameters in this nut type are widely stocked; confirm the exact schedule against quantity and size mix at quotation.
What should an RFQ for this nut type state?
State the standard designation (for example DIN 985 or DIN 6923), nominal thread size and pitch (metric coarse unless fine pitch is required), material and strength pairing with the mating bolt, finish (plain, zinc, or hot-dip galvanized where compatible), required certificates such as a mill test report per EN 10204 3.1, and quantity per size — plus destination country.
Related knowledge
- Pairing a Nut to a Bolt: Property Class, Flange vs Hex, and What the Evidence Actually Settles
- Pairing a Nut to a Bolt: Property Class, Height, Engagement and Flange vs Hex
- Pairing a Nut to a Bolt: Property Class, Flange vs Hex, and What the Evidence Actually Settles
- Thread Locking for Vibration: Nylon Patch, Threadlocker, Safety Wire or Lock Washer — What the Evidence Can Rank
Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support