We manufacture a comprehensive range of high-performance stainless steel fasteners in a variety of material grades that can meet the demands of even the most challenging applications. BUMAX products are fully traceable and we only use the highest quality European stainless steel.

The stainless steel for each grade is produced to stringent BUMAX specifications. Coupled with advanced manufacturing techniques, they are designed to outperform generic commodity fasteners more commonly found in the market.

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GradeStrength, min
TS/YS (MPa)1		Steel
standard2		Fastener
standard3		Micro
structure4		C max5Cr6Ni7Mo8Other9PRE10
BUMAX 88800/6401.4432/36/35A4Austenitic0.031711.52.727
BUMAX 1091000/9001.4432/36/35A4Austenitic0.031711.52.727
BUMAX NITRO 1091000/900S20910Austenitic0.0622122N, Mn34
BUMAX SA800/6401.4547, S31254A8Austenitic0.0220186.2N, Cu43
BUMAX DX 1291200/10801.4462, S32205D6Ferrite-Austenitic0.03225.23.2N34
BUMAX DX 1491400/12601.4462, S32205D6Ferrite-Austenitic0.03225.23.2N34
BUMAX SDX 1091000/9001.4410, S32750D8Ferrite-Austenitic0.032574N42
BUMAX ULTRA 1591500/1350Martensitic0.021294Al, Ti, Cu25
BUMAX HE1000/9001.4980, S66286Austenitic0.0815261.5Ti, V

1 Tensile strength/yield strength
2 Material grade reference under the EN and/or UNS system
3 Stainless steel grade according to the applicable fastener standard
4 Metallurgical structure
5 Maximum carbon content (%)
6 Chromium content (%)
7 Nickel content (%)
8 Molybdenum content (%)
9 Other key alloying elements
10 Pitting Resistance Equivalent, indicating relative resistance to pitting corrosion

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Austenitic stainless grades

BUMAX® 88

BUMAX 88 is one of our flagship stock grades that provides higher strength, corrosion resistance and fatigue performance than A4-80 generic stainless steel fasteners.

BUMAX® 109

BUMAX 109 is one of our flagship stock grades that offers higher strength than A4-100 and is the strongest A4/316 stainless steel fastener on the market.
Duplex stainless grades

BUMAX® SDX 109

BUMAX SDX 109 is a super duplex grade with excellent mechanical properties, and exceptional resistance to general crevice, pitting and stress corrosion.

BUMAX® DX 129

BUMAX DX 129 is a duplex stainless steel grade with very high strength combined with excellent corrosion resistance.

BUMAX® DX 149

BUMAX DX 149 is an ultra-high-strength duplex stainless steel fastener with excellent corrosion resistance.
Special/Super austenitic stainless grades

BUMAX® NITRO 109

BUMAX NITRO 109 is a nitrogen-strengthened austenitic stainless steel that provides superior corrosion resistance and strength for large diameter bolts.

BUMAX® SA

BUMAX SA is a 6Mo high-alloy austenitic stainless steel for aggressive chloride applications.
Precipitation hardenable stainless grades

BUMAX® HE

BUMAX HE is a high-temperature resistant grade for applications requiring high strength and good oxidation resistance at temperatures up to 700°C.

BUMAX® ULTRA 159

BUMAX ULTRA 159 is a unique precipitation-hardened stainless steel that provides ultra-high strength in class 15.9.

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