ISO 7044 Prevailing Torque All-Metal Hexagon Nuts with Flange
ISO 7044 prevailing torque type all-metal hexagon nuts with flange, M5 to M20: pitch, height m, collar h, flange c/dc and wrench geometry — current and superseded editions.
Last updated: 2026-11
Specifications
ISO 7044 is the current all-metal flange locknut: the flange replaces the washer (bearing diameter dc max 42.8 at M20 against the bolt's much smaller shank), and the all-metal collar gives prevailing torque that survives heat and chemicals. The collected 09/2000-edition table runs M5 to M20 with thread pitch P, nut height m min (18.7 at M20), the collar height band h min÷max (20.3÷22.4 at M20 — the distorted locking section that houses the prevailing-torque geometry), flange thickness c min (3 at M20), flange diameter dc max and the wrench data s nom=max (30 at M20) / e min (32.95). The source page also prints the superseded 11/1997 edition as a second table — transcribed verbatim alongside, since legacy drawings still carry it. This is the locknut of choice for new designs in hot or aggressive service: no polymer insert to melt, and the flange spreads clamp without a separate washer to forget.
| Standard / scope | ISO 7044 prevailing torque type all-metal hexagon nuts with flange — M5 to M20, edition 09/2000; superseded 11/1997 edition transcribed as a separate table |
|---|---|
| Height / collar | m min 18.7 at M20; collar band h min÷max 20.3÷22.4 — the all-metal prevailing-torque section |
| Flange | c min 3 (M20); dc max 42.8 at M20 — the built-in bearing circle that replaces the washer |
| Wrench geometry | s nom=max 30 at M20 (flange series WAF); e min 32.95; pitch P 2.5 at M20 |
| Not tabulated | Property class, prevailing torque, temperature/chemical rating, finish — per RFQ |
Materials
- Order in property class 8/10/12 steel with the collar distortion and coating sequenced so the locking threads stay clean (flag any plating — it changes prevailing torque); A2/A4 stainless for corrosive service. The all-metal collar is the temperature answer — state service temperature on the RFQ where it exceeds polymer-insert territory, and confirm whether mating bolts need the flange-compatible extra length for the collar band h
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 (ISO 7044 Prevailing Torque All-Metal Hexagon Nuts with Flange) 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
All-metal or nylon-insert locknut — how do I decide?
By environment and reuse count. The nylon insert (a different product family) gives lower run-in torque and cheap repeatable locking — up to roughly 120 °C and away from solvents. ISO 7044's all-metal collar keeps locking where the insert would melt, soften or creep: exhaust-adjacent flanges, ovens, engine peripherals, chemical plants — and it does not lose the lock as fast across repeated re-assembly, because the spring is steel. The flange is the second decision: it deletes the washer and resists embedment into softer surfaces, which on vibration-loaded joints is often the actual failure mode. If your joint is hot, chemical, or heavily vibrated, this is the standard; the tables carry the geometry, and we confirm property class and prevailing-torque class at quotation.
Why are there two edition tables, and does the 1997/2000 difference matter to my drawing?
The source page prints the current 09/2000 edition and the superseded 11/1997 edition as separate tables and both are transcribed verbatim — the audit path for legacy drawings that still call the 1997 document. Reading the two grids, the tabulated geometry carries through with only the edition rows and fine details differing; the practical risk is not the dimensions but the call-out: a drawing citing ISO 7044:1997 should be updated to the 2000 edition for new procurement so quality plans reference the current standard. If you are substituting a DIN all-metal flange nut (the withdrawn DIN 6923/6926-class call-outs), send the drawing and we verify the m/h/c/dc columns here against it before quoting, wrench size (s) included.
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