Open End Spanners
An open-end spanner has one open jaw for hex nuts and bolts. The jaw width must match the nut size exactly. Longer spanners provide more leverage for larger fasteners. Choose chrome vanadium steel with a chrome finish. The DIN ISO standard defines jaw accuracy. Also check head dimensions for tight spaces. This prevents slipping and damage.
1 subcategory
Single Open End Spanner | DIN 894 | 55 mm
Single Open End Spanner | DIN 894 | 60 mm
Single Open End Spanner | DIN 894 | 65 mm
Single Open End Spanner | DIN 894 | 6 mm
Single Open End Spanner | DIN 894 | 70 mm
Single Open End Spanner | DIN 894 | 75 mm
Single Open End Spanner | DIN 894 | 7 mm
Single Open End Spanner | DIN 894 | 80 mm
Single Open End Spanner | DIN 894 | 85 mm
Single Open End Spanner | DIN 894 | 8 mm
Single Open End Spanner | DIN 894 | 90 mm
Single Open End Spanner | DIN 894 | 95 mm
Single Open End Spanner | DIN 894 | 9 mm
Single open-end spanners: one jaw, exact size
Single open-end spanners: one open jaw
A single open-end spanner has one open jaw. It fits a hex nut or bolt. The across flats must match the nut size exactly. Always measure the nut if you are unsure. A jaw that is too wide slips off and damages the nut.
Single sizes or a fixed set
Missing one size in your toolbox? Order single sizes. There you find the loose spanner in the size you are missing, from 9 mm to 21 mm. Choose chrome-vanadium steel with a chrome-plated finish. That gives grip and resists rust. Watch the length: a long spanner gives more leverage on large sizes. For tight spaces a short version is handier. Check the head dimensions so the spanner fits between other parts.
Standard and fit
The DIN ISO standard sets how accurately the jaw is made. A spanner to DIN 894 fits the hexagon precisely. That lets you tighten nuts and bolts without play. Always use a matching spanner at high loads. That prevents slipping and damage to the workpiece.
Which spanner for which job
For one single nut in a tight spot, take a loose open-end spanner. If you need two sizes side by side, a double open end spanner is quicker. Working on a hybrid or electrical installation? Choose insulated spanners. Want one tool for open jaw and ring, then a combination spanner fits better. Unsure which type, start at spanners for the overview.