(1) Thread matching
M10 nuts must be matched with M10 bolts/screws (screw rod diameter ≈ 10mm).
Pitch (tooth pitch):
Ordinary M10 nuts default to coarse threads (1.5mm pitch), which is the most common.
Special needs may require fine threads (such as 1.25mm), which must be clearly stated, otherwise they cannot be screwed in!
(2) Hexagonal head size
Width across flats (S): Usually 16mm or 17mm (corresponding to the wrench size).
Thickness (H): Ordinary models are about 8~10mm, and thickened models will be stronger.
⚠️ Easy to make mistakes:
Some “non-standard” nut sizes may be different, so be sure to confirm the drawings or samples!
Material Features Applicable scenarios Price reference
Carbon steel (galvanized) Cheap, easy to rust (galvanized rust prevention is general) Indoor, ordinary machinery
Stainless steel 304 Good rust prevention, medium strength Outdoor, humid environment (such as the seaside)
Stainless steel 316 Super rust prevention (acid and alkali resistant) Chemical, shipbuilding, food equipment
Grade 8.8/Grade 10.9 High strength (quenching treatment) Automobile, heavy industry, load-bearing structure 30%~50% more expensive than ordinary models
⚠️ Note:
Stainless steel nuts cannot be mixed with ordinary carbon steel bolts (will “electrochemically corrode” and rust to death!).
High-strength nuts (such as grade 10.9) must be equipped with bolts of the same grade, otherwise they are easy to break!
Treatment method Features
Galvanized (white zinc/color zinc) Cheapest, general rust resistance (suitable for indoor use)
Blackening Weak rust resistance, but more industrial appearance
Dacroton Extremely rust-proof, high temperature resistant (commonly used in automobiles and outdoors)
Nickel plating Beautiful, good rust resistance (for precision equipment)