Combination Wrenches

Combination Wrenches

Combination wrenches — also called combination spanners — have an open-end jaw at one end and a closed ring at the other, both sized for the same fastener. The ring end provides a more secure grip on the fastener head and is preferred where access allows; the open end reaches fasteners in tight spaces where the ring cannot be placed. Combination spanners are the most common and versatile spanner form in trade and industrial use. AIMS Industrial supplies combination wrenches in metric and imperial from professional hand tool brands.

Ring End vs Open End

The ring end of a combination spanner contacts the fastener at six or twelve points around its circumference, distributing force evenly and reducing the risk of rounding corners on the fastener. The open end contacts only two faces and is more likely to slip if torque is applied aggressively or if the fastener is corroded. As a general rule, use the ring end where access allows — reserve the open end for spaces where the ring won't fit or for final tightening runs where access requires it.

Types of Combination Spanners

• Standard combination spanners: Fixed ring and open-end, same size both ends. Available individually and in sets from M6 through M32 (metric) or 1/4" through 1-1/4" (imperial).
• Ratcheting ring spanners: The ring end incorporates a ratchet mechanism, allowing the spanner to be used without removing it from the fastener on each stroke. Significantly faster in open access situations. Particularly useful in confined spaces where swing arc is limited.
• Stubby combination spanners: Shorter overall length for confined spaces. Reduced torque leverage is the trade-off — appropriate for lighter fasteners or where a torque wrench will be used for final tightening.
• Offset combination spanners: The ring end is angled (typically 15°) to provide knuckle clearance when working on flat surfaces.

Set vs Individual Spanners

A complete metric set (typically M8 to M19) covers the majority of fastener sizes in general engineering and maintenance. Imperial sets are required for equipment manufactured to imperial specifications — common on older Australian and American machinery. Individual spanners are the right buy when a specific size sees heavy use and needs a dedicated tool separate from the set. Professional tradespeople typically maintain both a set for general work and individual spanners in the most-used sizes so that the set is preserved and the most commonly needed sizes are always immediately available. For professional hand tool recommendations, contact our team.