근각 볼트(4각목 둥근머리 볼트) 경공업분야
A bolt having a round head with a square, ribbed, or fluted boss underneath it.
The function of the boss being to bite into timber to prevent the bolt turning while the nut is being tightend.
| Specification | KS B 1031 |
|---|---|
| Material | SAE, SS400, S45C, SCM440, STS304, STS316, etc... |
| Grade | 4.8, 8.8, 10.9 |
| Planing | Zinc galvanizing, Hot dip galvanize, etc |
