Buyer & Engineering Reference
Technical Guides
Straight answers to the comparisons buyers and engineers actually ask about — thread coverage, stainless grades, bolt property classes, and material selection. Every figure here is traceable to a recognised standard or Kesharia's stocked range.
Technical Guide
DIN 931 vs DIN 933 Bolts
DIN 931 and DIN 933 are both hex head bolts to the same head/wrench dimensions — the difference is how much of the shank is threaded. It affects clamping behaviour, not head size or wrench fit.
Read guideTechnical Guide
A2 vs A4 Stainless Steel Fasteners
A2 and A4 are the two stainless steel fastener grades most commonly specified in industrial and marine work. The letter refers to the base steel; the number after the dash (50 or 70) refers to the property class, not the material.
Read guideTechnical Guide
Bolt Grade 8.8 vs 10.9
8.8 and 10.9 are property classes under ISO 898-1, the standard that governs mechanical properties of steel fasteners. The two digits aren't arbitrary — they encode the bolt's strength.
Read guideTechnical Guide
Brass vs Stainless Steel Fasteners
Brass and stainless steel fasteners solve different problems. Both resist corrosion well, but the reasons to pick one over the other come down to conductivity, magnetism, strength, and cost.
Read guide