What is a scaffold spanner?
What is a scaffold spanner? |
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A scaffold spanner usually has a box-shaped or ‘socket’ head on one (single-ended) or both ends (double-ended) of the shaft (or handle). | |||
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The term ‘scaffold spanner’ is also used to refer to podgers (see What is a podger?), usually with ratcheted ring heads. | |||
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Scaffold spanners are essential tools for all builders who erect scaffolding for building work. | |||
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Scaffold spanners often use a 12-point (bi-hex) profile which can reduce the space that is needed to turn the fastener because it provides more possible positions for the spanner to fit onto the head of the fastener. | |||
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They come in two Whitworth standard sizes to fit hexagonal fasteners: 7/16″W (Whitworth) and 1/2″W. To keep new pieces of scaffolding compatible with the older parts, scaffolding still uses this old size standard developed during the Industrial Revolution. | |||
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The length of most scaffold spanners is between 200mm and 300mm (8-12″). | |||
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The socket heads of scaffold spanners are flexible (see What is a flex-head spanner?), which is useful in obstructed spaces. Some have a double head on one end which spins within a stirrup. | |||
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Most scaffold spanner heads are made from steel but some are made from titanium, a much harder, lighter metal. It is more expensive than steel but well worth the investment if you are erecting scaffolding every day. | |||
Types of handle |
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Handles are one of the main differences between scaffold spanner designs. Because they are designed to be used every day, all day, by the user, each person has a preference for handle shape and a range has been developed. The largest width of the handle is usually given in the product description. | |||
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RoundRound handles are cylindrical with a diameter of 14 or 16mm. They can be knurled (see below) or smooth. |
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FlatFlat handles are made of a cylindrical base with two parallel flat sides that have been ground away from the handle. The flat sides can help with keeping the user’s hand in an optimal position while using the spanner. |
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KnurledKnurled handles have a cross-hatch of lines etched into them. This improves the user’s grip on the handle. |
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PokerPoker handles are cylindrical handles that bulge in the middle, taper towards the end and have a knob on the end. This is quite a comfortable handle to use as the bulge fits in the palm of the hand and the knob prevents the hand slipping off the end of the tool. On the other hand, the bulge makes the handle thicker so it is less likely to fit into a confined space. |
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SteppedStepped handles have a thinner section near the head and a thicker section where the user grips the tool. The thinner section allows more movement of the spanner so it is better able to turn fasteners in tight spaces. |
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PodgerA podger end is a tapered end which is pushed through bolt holes to line them up. See What is a podger? for more information. |
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