Open Ended Spanners by Size Pair, Pattern & Standard

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Type

Open Ended Spanner

FAQs

Where the fastener cannot be approached from above. A ring spanner has to drop over the nut, which a pipe union or a captive fastener does not allow.

Grip. An open jaw bears on two flats rather than six, so it spreads the nut under load and rounds it if the fastener is tight or the flats are worn.

No, use it to run a nut down. Breaking a tight fastener loose is a ring spanner job wherever one will fit over the nut.

One short by design for fine work in a confined space, starting at 3.5 x 4.5mm. It is not a scaled-down standard spanner but a different pattern.

Metric to 36 x 41mm and imperial to 1-7/8 x 2-1/16 inch, with both ends of each spanner carrying a different size across the range.

Spanner extenders are held, though a ring spanner is the better answer where one will fit. An extender on an open jaw increases the force that rounds the nut.

Clear

An open ended spanner goes onto a nut sideways, which is what makes it the only spanner usable where the fastener cannot be approached from above. A ring spanner has to drop over the nut, and on a pipe union or a captive fastener that is not possible. It is also the spanner that fits where the fastener is surrounded on three sides.

The trade is grip. An open jaw bears on two flats rather than six, so it spreads the nut under load and rounds it if the fastener is tight or the flats are already worn. It is used to run a nut down rather than to break it loose. A rounded nut then has to be gripped from outside, which is a longer job than starting with the right spanner.

Pattern changes the reach rather than the grip. A midget spanner is short by design for fine work in a confined space, starting at 3.5 x 4.5mm here. A long spanner puts more handle behind the same jaw for reach past an obstruction. Both patterns are held across the size range so the reach is chosen without changing the size.

Sizes are quoted in pairs because both ends differ, running to 36 x 41mm in metric and 1-7/8 x 2-1/16 inch in imperial. Spanner extenders are held for a nut that will not move by hand, though a ring spanner is the better answer where one will fit. Send the fastener to 07754288583 on WhatsApp. Sizes are also stamped on both jaws so either end can be identified without turning the spanner over.