Description
Hex Nut M12 A4 Stainless Steel ISO 4032 — BOLTON SKU 54686.
About the Hex Nut M12 A4 Stainless Steel
This nut hex M12 A4 stainless component is a style 1 hexagon nut made to ISO 4032, the international standard for regular-height hexagon nuts in product grades A and B. The thread is M12 with the 1.75 mm coarse pitch and a 6H tolerance class, so it mates with standard M12 coarse-thread bolts and screws. Across the flats the nut measures 18 mm nominal, giving a minimum width across corners of 20.03 mm, and the nut height is 10.80 mm maximum and 10.37 mm minimum. The material designation A4 identifies a molybdenum-bearing austenitic stainless steel, the group specified where chloride exposure is expected and A2 grades would be at risk of pitting. The nut is supplied plain, without plating or passivation coatings.
Key specifications
| Standard | ISO 4032, hexagon nuts style 1 |
|---|---|
| Thread | M12 x 1.75 coarse |
| Thread tolerance | 6H |
| Width across flats (s) | 18 mm nominal |
| Width across corners (e) | 20.03 mm minimum |
| Nut height (m) | 10.80 mm max / 10.37 mm min |
| Material | A4 molybdenum-bearing austenitic stainless steel |
| Finish | Plain, uncoated |
Typical applications
Used as the nut half of M12 coarse-thread bolted joints in marine, coastal and washdown environments where the A4 grade is specified for chloride resistance. The 18 mm across-flats size means it is driven with a standard 18 mm socket or spanner, and the full ISO 4032 height gives a load-bearing thread engagement suited to structural rather than jam-nut duty. Commonly paired with A4 M12 hexagon or socket screws and A4 plain washers so the joint remains one stainless family.
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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