Description
8156174 NUT HEX LOCK M3 ISO 7040 SS A2 HIGH TYPE — BOLTON SKU 63724.
About the 8156174 Hex Lock Nut M3 ISO
ISO 7040 specifies prevailing torque hexagon regular nuts with a non-metallic insert, in steel and stainless steel, with metric coarse pitch threads. Standards references give the covered size range as M3 to M36, in product grade A for threads up to and including M16 and grade B above that, and list DIN 982 as the equivalent German norm. The locking action comes from a polymer insert seated in the top of the nut: as the bolt thread cuts into the insert it generates prevailing torque, so the nut resists loosening under vibration without needing a separate lock washer or thread-locking adhesive. Steel property classes 5, 8 and 10 are covered, along with austenitic stainless grades A2 and A4. This item is recorded as an M3 nut in A2 stainless steel, and the high-type style wording is carried from the item record rather than from a manufacturer datasheet.
Key specifications
| Standard | ISO 7040 |
|---|---|
| Type | Prevailing torque hexagon nut with non-metallic (nylon) insert |
| Thread | M3, metric coarse |
| Material | Stainless steel, A2 austenitic |
| Product grade | A (threads up to and including M16) |
| Locking method | Non-metallic insert, prevailing torque |
| Equivalent norm | DIN 982 |
| Style stated on item | High type |
Typical applications
Nyloc nuts of this size are used across equipment assembly and MRO wherever a small threaded joint must hold against vibration but still be dismantled: enclosure and bracket fixings, sensor and antenna mounts, UAV airframe hardware and ground-support assemblies. Nuts with polymer inserts are generally treated as single-use once the prevailing torque has dropped. Follow the assembly drawing for torque and re-use policy.
Supplied by BOLTON Technical Equipment Supplies against request for quotation. Add this item to your RFQ basket to request pricing, lead time and documentation requirements (e.g. CoC, datasheets or test reports where applicable).
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