ナベ小ねじ - nabeko neji
Pan Head is the principal variety of screw found on Japanese motorcycles. Pan head were used almost excusively for engine cranckases until the mid 1980s. Easy to mess because you don't have the right screwdrivers and often replaced by much better but ugly Allen bolts!
Exact replacement for these OEM reference famillies:
Honda: 93500-xxxxx
Yamaha: 98580-xxxxx or 97885-xxxxx
Suzuki: 02120-xxxxx
Kawazaki: 220B-xxxx or 220AA-xxxxxx
Japanese vintage motorcycles, JIS screw, small head nut, small head bolt, pan head screw, honda, Kawasaki, Yamaha, Suzuki, Kawasaki 900 Z1, honda 750 CB K, Yamaha 350 rd, Suzuki 750 gt, zinc, stainless, acorn nut, black zinc, Japanese industrial standard, JIS screwdriver, engine bolt, flange bolt