Description
Hex Lock Nut M6, Stainless Steel A4, Polyamide Insert, ISO 7040 — BOLTON SKU 60989.
About the Hex Lock Nut M6, Stainless Steel A4
This Hex Lock Nut M6 Stainless Steel part is a prevailing-torque type hexagon nut with a non-metallic insert, manufactured to ISO 7040 (style 1), the standard that covers such nuts from M3 up to and including M36. A polyamide ring is captive in the top of the nut; as the mating M6 thread cuts into the unthreaded insert it generates a prevailing torque that resists self-loosening under vibration and shock, without marking the bolt thread the way all-metal locking features can. The nut body is A4 austenitic stainless steel, a molybdenum-alloyed grade with enhanced resistance to chlorides and marine atmospheres, so the fastener suits corrosion-exposed joints when paired with A4 bolts and washers. Because the prevailing torque is generated by the insert itself, the locking action does not depend on joint preload and remains present even if the joint relaxes in service.
Key specifications
| Standard | ISO 7040, style 1 (prevailing-torque hex nut) |
|---|---|
| Thread | M6 |
| Locking element | Polyamide (non-metallic) insert |
| Material | Stainless steel A4 |
| Standard size range | ISO 7040 covers M3 to M36 |
Typical applications
M6 polyamide-insert lock nuts are used on bolted joints subject to vibration — fan and motor mounts, panel frames, vehicle-fitted equipment and machinery covers — where the joint must stay tight without thread adhesives. Because the insert is non-metallic, this nut type is normally selected for moderate-temperature joints rather than hot zones, and in A4 stainless it serves corrosion-exposed outdoor and coastal installations.
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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