McMaster-Carr Hexagon Bolt 18-8 SST

Material: 18-8 stainless steel

Sizes:

M3 x 12 (91287A016)

M4 x 16 (91287A115)

M4 x 20 (91287A116)

M4 x 25 (91287A117)

M4 x 40 (91287A053)

M4 x 45 (91287A055)

M4 x 10 (91287A112)

More corrosion resistant than 18-8 stainless steel screws, these 316 stainless screws have excellent resistance to chemicals and salt water. They may be mildly magnetic. Length is measured from under the head.

Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Fine threads are closely spaced to prevent loosening from vibration.

Screws that meet ASME or ISO (formerly DIN) specifications comply with these dimensional standards.