Bumax 88 M10 x 40mm Countersunk Socket Screw ISO 10642 Stainless Steel

Bumax is a Swedish manufacturer of premium stainless steel fasteners, globally recognised for producing the world's strongest stainless steel bolts. Bumax A4-grade 316L stainless fasteners combine exceptional corrosion resistance with tensile strengths reaching Grade 10.9 — the fastener of choice for chemical processing, marine, mining, and critical infrastructure.

Bumax high tensile hex bolts and set screws deliver the corrosion resistance of stainless steel without the strength compromise — rated to Grade 8.8 or 10.9 in 316L stainless steel.

Where this product is used

High tensile stainless fasteners are required wherever corrosion resistance and structural strength must coexist.

• Chemical plant, water treatment, and processing equipment bolted connections
• Offshore, coastal, and marine structures exposed to salt spray and immersion
• Mining equipment and heavy machinery operating in corrosive or wet environments

Key specifications

Selecting the right option

Select the grade (8.8 or 10.9) based on the required clamping force and structural loading. Ensure thread pitch and diameter match the tapped hole specification precisely — Bumax fasteners are manufactured to exacting tolerances.