DIN 980 All-Metal (Stover) Lock Nuts
All-metal prevailing-torque lock nuts per DIN 980 (Stover type) — a one-piece steel nut whose distorted top thread grips the bolt by metal-to-metal friction. No nylon, so it carries high temperature, heavy-duty service and many reuse cycles.
Last updated: 2026-11
Specifications
The Stover-type lock nut solves the nyloc's temperature and reuse ceiling by dropping the polymer entirely: a one-piece steel nut with a slightly distorted top thread that grips the bolt by metal-to-metal friction. With no insert to soften, it works where nylocks cannot — high temperature, heavy-duty service, and applications that need more installation cycles. Select it to the mating bolt strength: for Grade 8 / Grade 9 inch-series bolt assemblies, the Grade 9 all-metal version is the matching choice. The trade-off is a slightly higher running torque and more wear on the bolt thread than a nylon insert causes.
| Standard | DIN 980 / DIN 6925 — all-metal prevailing-torque lock nut (Stover type) |
|---|---|
| Locking mechanism | Distorted top thread grips the bolt by metal-to-metal friction — no nylon insert |
| Temperature limit | High — all-steel construction has no polymer insert to soften |
| Reuse | Good — tolerates more installation cycles than a nylon-insert nut |
| Grade pairing | Match to the bolt grade; Grade 9 all-metal version for Grade 8 / Grade 9 bolt assemblies |
| Typical applications | High temperature, heavy-duty service, and joints that need frequent reassembly |
Materials
- Steel
- Stainless 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 (DIN 980 All-Metal (Stover) Lock Nuts) 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 is a Stover nut, and when is it better than a nyloc?
A Stover nut is an all-metal prevailing-torque lock nut — a one-piece steel nut with a distorted top thread that grips the bolt by friction, with no nylon insert. Neither lock nut is universally better: nylon-insert is cheaper and fine for general, moderate-temperature assembly, while all-metal (Stover) handles high heat (above roughly 250°F), heavy-duty loads and frequent reuse where nylon would fail. Choose by joint temperature, service load and how often the joint is taken apart.
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
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