Hexagon Socket Head Cap Screw

We supply premium quality hexagon socket head cap screws in a variety of dimensions and grades.

ISO 4762 Bumax 88


ISO 4762 Bumax 109


ISO 4762 Bumax SDX 109

BUMAX SDX 109 fasteners are made from premium quality 1.4410, UNS S32750 material.

BUMAX SDX 109 bolts of dimension M6 to M12 in strength class 10.9 are held in stock. Other dimensions and strength classes (up to 12.9) are produced on request.

For NORSOK inquiries, please contact your BUMAX sales representative.


ISO 4762 Bumax DX 129

Duplex Stainless Steel fasteners in strength class 12.9 are made from the duplex grade 1.4462, UNS S32205.

BUMAX® DX 129 is a duplex stainless steel fastener that combines strength, corrosion resistance and ductility for the most demanding applications.

Tensile strength: min 1,200 MPa

Yield strength: min 1,080 MPa

Elongation: Significantly better than 12.9 carbon steel and similar or better than A4/70. Elongation > 0.4x d.

Corrosion resistance: Significantly better than A4 (316L) (PRE >34 vs 25).

Availability: off the shelf in dimensions M6-M16 in hexagon socket head cap ISO 4762 in lengths according to the table below


ANSI B 18.3 – Bumax 88


BUMAX is available worldwide

Our extensive network of sales offices and distributors makes it easy to get in touch with us. Find your local sales office or distributor below. For other countries not represented, please contact our Main Sales Office.

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