Bits
Screwdrivers and Bits
Bits are interchangeable driving tips with a standardised shank that fit bit holders, bit screwdrivers, ratchets and cordless drivers. The relevant standards are DIN 3126 and ISO 1173: shank form C 6.3 corresponds to the 1/4 inch hex, form E 6.3 to the version with a groove for quick change chucks; in electronics the 4 mm shank is used in addition. The range covers slotted, Phillips, Pozidriv, TORX, TORX Plus, hex and security profiles such as Y type and Pentalobe, plus adapters from 1/4 inch to 4 mm and extensions up to 115 mm. The category holds 700 items, the leading brands are Wiha, Wera and Bernstein.
| Shank form | Dimension | Typical length | Use |
|---|---|---|---|
| Form C 6.3 | 1/4 inch hex | 25 mm | bit holders, ratchets, cordless drivers |
| Form E 6.3 | 1/4 inch with groove | 25 to 50 mm | quick change chucks |
| 4 mm shank | 4 mm hex | 10 to 32 mm | precision mechanics and electronics |
| Adapter | 1/4 inch to 4 mm | 12 to 25 mm | 4 mm bits in 1/4 inch holders |
| Extension | 4 mm or 1/4 inch | 60 to 115 mm | deep-set fastenings |
Typical applications: Series driving with cordless drivers in equipment assembly; repair of smartphones and notebooks with security profiles; maintenance work with changing drives from a single bit magazine; assembly work inside the EPA with a dissipative handle; recessed fastenings reached with extensions and magnetic holders; precision work on small devices using 4 mm bits.
