Description
Hex Nut M4 A4 Stainless Steel ISO 4032 — BOLTON SKU 57596.
About the Hex Nut M4 A4 Stainless Steel
ISO 4032 covers the standard-height hexagon nut, the everyday full nut used across metric assemblies. In M4 the standard sets a width across flats of 7.00 mm nominal, with a minimum of 6.78 mm, and a nut height of 3.20 mm maximum and 2.90 mm minimum. The thread is M4 coarse at 0.7 mm pitch. This item is supplied in A4 stainless steel, the molybdenum-bearing austenitic grade specified where chloride exposure, marine atmosphere or aggressive cleaning chemistry would attack A2. Being a plain hexagon nut, it carries no prevailing-torque feature: where vibration is a concern it is used with a locking washer, thread-locking compound or a separate locking nut. Pairing an A4 nut with an A4 screw also avoids the galvanic mismatch that arises when stainless and plated-steel fasteners are combined in a wet joint.
Key specifications
| Standard | ISO 4032 |
|---|---|
| Thread | M4, 0.7 mm pitch |
| Width across flats | 7.00 mm nominal (6.78 mm min) |
| Nut height | 3.20 mm max (2.90 mm min) |
| Material | A4 austenitic stainless steel |
| Locking feature | None — plain hexagon nut |
Typical applications
The 7 mm across-flats size means this nut is driven with a common 7 mm socket or spanner, which keeps it practical for through-bolted joints in panels, frames and equipment racks where access is from both sides. A4 material makes it a routine choice for outdoor structures, coastal installations and wash-down areas. Because it has no self-locking element, it is generally specified where the joint is either clamped hard against a shoulder or backed up by a separate anti-vibration provision.
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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