It is a bolt with a washer attached.
The washer is attached, so the load is distributed over a larger area than when assembled with only the bolt head.
Related standards include DIN 6921 and JIS B1189.
Detailed Information
Material
S45C(8.8), SS400, SUS304, SUS316
Coating
zinc-plated(yellow, white, black, whisker), GEOMAT, hot dipping
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