我公司生产的蝶形螺母螺纹规格为M3-M24、保证扭矩为工级，用Q235钢锻制成的两翼为半圆形的A型和B型蝶形螺母。
表面电镀处理，可参阅(GB/T 5267.1-2002,IS O 4042:1999,IDT)
ISO general purpose metric screw threads-Tolerances-Part 2: Limits of sizes for general purpose
external and internal screw threads-Medium ,MOD)