Premium brand · stocked & certified by PTS
The world’s strongest stainless steel fasteners
BUMAX® matches the strength of carbon steel grades 8.8 and 10.9 in stainless — and goes up to Grade 17.9 with BUMAX ULTRA, the strongest stainless bolts in the world. Stocked and certified by PTS.
17.9Max grade (ULTRA)
PRE > 25.710-yr marine rated
88 / 109= carbon-steel strength
Authorised UK distributor · full certification
Shop BUMAX by type
Genuine BUMAX® range — metric and inch, grades 88 & 109, held in stock.
BUMAXHexagon Full Nuts →DIN 934 · grades 88 & 109
BUMAXFlat Washers 200HV →Metric & inch · hardened
BUMAXSocket Cap Screws →DIN 912 · grades 88 & 109BUMAXHexagon Set Screws →DIN 933 · fully threaded
BUMAXAll-Metal Self-Locking Nuts →Prevailing-torque · stainlessBUMAXLarge Series Flat Washers →ISO 7093-1 · 200HV
BUMAXSocket Countersunk Screws →ISO 10642 · grade 88BUMAXHexagon Head Bolts →DIN 931 · grades 88 & 109BUMAXUNC Hexagon Head Bolts →Imperial coarse · grades 88 & 109BUMAXUNF Hexagon Head Bolts →Imperial fine · high-tensileBUMAXUNC Socket Cap Screws →Imperial socket caps · grade 88BUMAXUNC Hexagon Full Nuts →Imperial high-tensile nutsBUMAXUNC Set Screws →Fully threaded · imperialBUMAXImperial Flat Washers 200HV →Inch bores · hardenedStandardsDIN / ISO
Strength grades88 & 109
Max grade (ULTRA)17.9
PRE value>25.7
Why BUMAX®?
Can I replace 8.8 & 10.9 steel fasteners with BUMAX?
Yes — BUMAX 88 & 109 are the only real stainless alternatives to carbon steel, guaranteeing the same UTS and yield as the carbon-steel grades.
Can I get something stronger than 10.9?
Yes — we can supply stainless to order at strengths up to Grade 17.9. Called BUMAX ULTRA, these are the strongest stainless bolts in the world.
Better corrosion resistance than A4/316?
Yes — thanks to its chemical composition, BUMAX has a minimum PRE value over 25.7, making it safe in a marine environment for 10 years, well beyond regular A4/316.
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