Ratchets and sockets: what 1/4, 3/8 and 1/2 mean

Guides 19/10/2026 By INVENTĀRS 6 views 0 reviews

Two numbers get glued together: the drive square (1/4, 3/8, 1/2 inch) and the opening in millimetres (9, 10, 14 mm). The first is which ratchet the socket sits on. The second is the nut. This page keeps them apart.

Mark	Read it as	Mistake
1/4, 3/8, 1/2	Drive square	Thinking 1/2 means “a 13 mm socket”
9 mm, 10 mm, 14 mm	Wrench opening	Forcing 1/4 onto a 1/2 ratchet with no adapter
6- vs 12-point	How many flats hold the nut	12-point “always better”
Impact	Made for an impact wrench	A chrome socket in impact

RICHMANN 42-C1410 — socket 1/4, 10 mm. RICHMANN 42-C1509 — 1/2, 9 mm. Small millimetres, different squares.

KS Tools 918-1333-E — 12-point, 1/2", 14 mm, CHROMEplus. 12-point turns in a tighter angle; 6-point usually holds a rounded nut better. Read “12-point” on the card.

KS Tools 514-1108-E — hex adapter 1/4" × 1/2". KS Tools 515-1372-E — impact adapter F3/4" × M1/2". An impact adapter is not a chrome socket and not a magnetic bit holder.

DeWalt DT7462 — compact impact 8 mm nut setter — not a 1/2 chrome socket. SPECIALIST+ 24-2-037 — magnetic holder 8 × 65 mm; 24-2-040 — 13 mm. That is bit work, not a 1/2 ratchet.

How to use: square on the ratchet; mm on the nut; impact or not. Ratchets and sockets. Bits: PH PZ TX.

Sources: square/mm from the cited cards (19.10.2026.).