JIS Black Stainless

JIS Nuts Black Stainless
JIS Washers Black Stainless
JIS Phil Pan Head Black Stainless
JIS Round Oval Countersunk Head Black Stainless
JIS Unmarked Hex Bolts Black Stainless
JIS Socket Cap (Allen Head) Black Stainless

SUS304 (A2)
With Mo (molybdenum) added, which has good corrosion resistance.
In addition, corrosion resistance is improved by increasing the amount of Ni (8% for 304).

SUSXM7 (A2)
Stainless steel that is easier to process than SUS304.
　Cr18% + Ni9% + Cu3%
Cu (copper), a soft metal, is added to SUS304, which does not have good cold workability, to suppress work hardening and make it easier to cold work.
Corrosion resistance and strength are equivalent to SUS304.

SUS316 (A4)
Stainless steel has particularly good corrosion resistance among austenitic stainless steels.
　Cr18% + Ni12% + Mo2%

We use a company in the Midlands, UK to chemically blacken our JIS stainless

Measure from end of thread to under the head 

Screw  3mm Screw Length +0/-1.0mm Thread Pitch  0.50mm Max Head OD 5.5mm

Screw  4mm Screw Length +0/-1.0mm Thread Pitch  0.70mm Max Head OD 7mm

Screw  5mm Screw Length +0/-1.0mm Thread Pitch  0.80mm Max Head OD 9mm

Screw  6mm Screw Length +0/-1.0mm Thread Pitch  1.00mm Max Head OD 10.5mm