Standards ensure the reliability, durability, and compatibility of fasteners, including nuts, bolts, screws, and threads. They define specifications for dimensions, tolerances, materials, and coatings, supporting precision engineering and global interoperability.

Top standards

ISO general purpose metric screw threads — Tolerances
Part 1: Principles and basic data

Fasteners — Hexagon socket countersunk head screws with reduced loadability

Fasteners — Electroplated coating systems

ISO general-purpose metric screw threads — Gauges and gauging

Mechanical properties of fasteners made of carbon steel and alloy steel
Part 1: Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread

ISO general purpose metric screw threads — Tolerances
Part 2: Limits of sizes for internal and external threads (tolerance classes 6H and 6g for M1,6 to M100 and 5H and 6h for M1 to M1,4)

Aerospace — Nuts, plain or slotted (castellated) — Procurement specification

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