Description
ISO 10511 M8-A4 Prevailing Torque Type Nut — BOLTON SKU 56932.
About the ISO 10511 M8-A4 Prevailing Torque Type
ISO 10511 specifies prevailing-torque hexagon thin nuts with a non-metallic insert in metric coarse threads, in steel and in A2 or A4 stainless. The M8 size in this listing carries an M8 × 1.25 coarse thread to 6H tolerance, is 13 mm across the flats and 5.5 mm high overall. Its locking element is a polymer insert set into the crown of the nut; the bolt cuts its thread form into the insert during assembly, and the interference between the two produces a prevailing torque that has to be overcome every turn, on and off. That behaviour keeps the nut in place when a joint relaxes or when vibration would otherwise back off a plain nut. The A4 grade of ISO 3506-2 is the molybdenum-bearing austenitic stainless normally chosen for chloride exposure. Being a style-0 thin nut, it has reduced loadability compared with a standard-height nut and is not designed to give full thread-stripping resistance.
Key specifications
| Attribute | Value |
|---|---|
| Standard | ISO 10511 — prevailing torque hexagon thin nut with non-metallic insert |
| Thread | M8 × 1.25 (metric coarse) |
| Thread tolerance | 6H |
| Width across flats (s) | 13 mm |
| Nut height (m) | 5.5 mm |
| Material | A4 stainless steel (ISO 3506-2) |
| Locking element | Non-metallic (polymer) insert |
| Nut style | Thin nut, style 0 |
Typical applications
At M8 the fastener moves into equipment and frame work, and the iso10511 m8-a4 nut prevailing torque type appears on pump and motor ancillary mounts, handrail and ladder fittings, deck and roof-mounted plant, gate and shutter hardware, and machine guarding subject to constant vibration. The 5.5 mm nut height helps where a locking nut has to fit under a cover or inside a shallow recess that a full-height M8 nyloc would not clear. With A4 material the nut is suited to outdoor, coastal and washdown installations. Keep it to light and moderate clamping duties, and use a full-height nut where thread-stripping margin is part of the design case.
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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