Machine screws and nuts for spectacle frames
This Japanese Industrial Standard specifies the machine screws made of stainless steel, brass, and nickel silver (hereafter referred to as “machine screws”) as well as the nuts made of nickel silver.

Check out other specifications
Cold rolled flat steel products for cold forming – Technical delivery conditions – English version of DIN EN 10130
Standard Specification for Alloy Steel Socket-Head Cap Screws
ISO general purpose metric screw threads – Tolerances – Part 1 : Principles and basic data
“TWIST OFF” TYPE TENSION CONTROL STRUCTURAL BOLT/NUT/WASHER ASSEMBLIES, STEEL, HEAT TREATED, 150 KSI MINUMUM TENSILE STRENGTH
STRUCTURAL BOLTS, STEEL, HEAT TREATED, 120/105 KSI MINIMUM TENSILE STRENGTH
Clevis pins without head (ISO 2340 : 1986) English version of DIN EN 22 340