Wrench Size

Wrench Size (SW:Schlüsselweite, Wrench Width, Width across flats)

Enter shaft diameter:


Hexagon which can fit this diameter:

Standart SW dimension:

Recommended minimum SW length:

Possible wrenches that can be used: (t:thickness)

ISO 10102:2018 Assembly tools for screws and nuts - Double-headed open-ended engineers' wrenches.

ISO 3318:2016 Assembly tools for screws and nuts - Open-ended wrenches, box wrenches and combination wrenches - Maximum widths of heads.

ISO 1085:2016 Assembly tools for screws and nuts - Double-ended wrenches - Size pairing.

ISO 691:2005 Assembly Tools for Screws and Nuts - Wrench and Socket Openings - Tolerances for General Use

DIN 3110:1987 Engineers wrenches, double head, open end, with unequal jaw widths; test torques series c.

DIN 475-2:1982 Wrench and socket openings.

Sample Shafts:
Shaft and Hexagon Diagram: