Open End and Ring Spanners
Wrenches and Sockets
Open end and ring spanners transmit torque straight onto hexagon fasteners without a square drive. The open end spanner to DIN 3110 and ISO 1711 engages two flats and can be fitted from the side, while the ring spanner to DIN 838 and ISO 691 encloses the head completely and puts far less load on its corners. Selection follows the across flats size, the head shape (straight, offset, slim line) and the swing clearance available at the joint. The range holds 636 items, mainly from Bahco, Proxxon, Wera and Knipex, complemented by Bernstein and Wiha.
| Type | Standard | Engagement | Application |
|---|---|---|---|
| Open end spanner | DIN 3110, ISO 1711 | two flats | side access to exposed fasteners |
| Double open end spanner | DIN 3110 | two flats, two sizes | slim head for restricted space |
| Ring spanner | DIN 838, ISO 691 | twelve corners | high torque, offset head for clearance |
| Combination spanner | DIN 3113 | combined | one size, two engagement types |
| Adjustable wrench | DIN 3117 | two flats, stepless | odd sizes and union nuts |
Typical applications: control cabinet and terminal assembly; tightening circular connectors in sensor and control technology; maintenance of machines and production lines; pipe fittings and union nuts in fluid technology; equipment and test rig construction; service cases for on-site assembly work.
