Description
ISO10511 M4-A4 NUT M4 PREVAILING TORQUE TYPE HEXAGON TH — BOLTON SKU 56925.
About the ISO 10511 M4-A4 Nut M4 Prevailing
This fastener is a prevailing torque hexagon thin nut manufactured to ISO 10511, in M4 metric coarse thread and A4 stainless steel. ISO 10511 specifies thin-style hexagon lock nuts fitted with a non-metallic (polyamide) insert: as the mating thread enters the insert, the polymer deforms and grips the thread, generating a prevailing torque that resists self-loosening under vibration without marring the bolt thread. The A4 material class is the molybdenum-bearing austenitic stainless grade (316 type), selected for its corrosion resistance in marine, chemical and outdoor environments. Being the thin (low-profile) style, ISO 10511 nuts occupy less axial height than full-height prevailing torque nuts, and the standard notes their correspondingly reduced load capability compared with regular-height nuts — a consideration for joint design. Insert-type nuts are also reuse-limited, since the locking action relies on the polyamide ring and diminishes with repeated assembly.
Key specifications
| Type | Prevailing torque hexagon thin nut (non-metallic insert) |
|---|---|
| Standard | ISO 10511 |
| Thread | M4, metric coarse |
| Material | A4 stainless steel (316 type) |
| Locking feature | Polyamide insert, prevailing torque |
| Style | Thin / low profile |
Typical applications
Insert-type lock nuts are used throughout vibrating assemblies — vehicle and equipment structures, enclosures, UAV airframes and marine hardware — wherever fasteners must stay tight without thread adhesives. The A4 grade suits coastal, offshore and chemically exposed 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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