STAINLESS STEEL BUMAX

Bumax

BUMAX is a premium Swedish brand of high-tensile A4/316 stainless steel fasteners, engineered to match the strength of carbon steel property classes 8.8 and 10.9 while retaining full stainless corrosion resistance. The range is manufactured to eliminate the risk of galling — a common failure mode in standard stainless fasteners where mating threads seize and cold-weld during tightening — and every Bumax fastener carries full mill traceability. PTS stocks Bumax across nuts, washers and a range of screws and bolts.

Materials
Bumax fasteners are manufactured in high-tensile A4 (316) stainless steel.

Nuts
The Bumax nut range includes Hexagon Full Nuts, All Metal Self Locking Collared Nuts and All Metal Self Locking Flanged Nuts, giving a choice between plain and self-locking options depending on the application.

Washers
Bumax Flat Washers and Bumax Large Series Flat Washers ISO 7093-1 200HV are available for pairing with Bumax bolts and screws, with the large-series option suited to applications needing a wider bearing surface.

Screws and bolts
The screw and bolt side of the range covers Bumax Socket Cap Screws, Bumax Socket Countersunk Screws ISO 10642, Bumax Hexagon Set Screws, Bumax Hexagon Bolts, Bumax Hexalobular Pan Machine Screws ISO 14583 and Bumax Hexalobular Countersunk Machine Screws ISO 14581, covering the common head and drive types across both fully and partially threaded options.

FAQs
What makes Bumax different from standard A4 stainless fasteners?
Bumax combines the corrosion resistance of A4/316 stainless steel with a high-tensile strength grade equivalent to carbon steel property classes 8.8 and 10.9 — well above the strength of standard A4 stainless fasteners. The manufacturing process is also engineered to prevent galling, and each fastener is fully mill-traceable, which matters in applications where certified material provenance is required.

Does Bumax need special handling or torque during installation?
Bumax fasteners are installed in the same way as standard fasteners of the equivalent size — no special tooling is required. As with any high-tensile fastener, the property class should be checked before applying torque, since a higher-strength fastener will generally have a different recommended torque value than a standard-grade A4 fastener of the same size.