hex socket head cap bolt
A bolt with a hexagonal recess in the head, tightened with a hex key (Allen wrench). Technical term used in mechanical engineering and manufacturing.
This part is secured with hex socket head cap bolts.
You need a hex wrench to tighten a hex socket head bolt.
A hex head bolt with an external hexagonal head, tightened with a wrench, unlike the internal hex socket of 六角穴付きボルト.
The hex key (Allen wrench) used to drive 六角穴付きボルト.
Full standard form; the most explicit and common spelling.
Abbreviated form without き; common in technical contexts.
Compound of 六角 (hexagonal), 穴 (hole), 付き (attached, with), and ボルト (bolt). The abbreviated form 六角穴付ボルト drops the okurigana き.