Bolt sizes
General elise bolt sizes
Bolt Size: Follow the Thread
A thread is basically a continuous protruding or receding helical ridge formed along the length of a cylinder.
This ridge is referred to as the crest. The space between each of the crests, or ridge components of a fastener is the root. The crest and ridge of a bolt are set an angle, which is known as the helix angle.
Bolt sizes vary to accommodate differing major diameters. The major diameter is measured by taking into account the outer diameter of the tops of the thread crests on a bolt.
These measurements are expressed in millimetres, and are usually rounded off to the next highest whole number.
For example, A 3.98mm bolt will be referred to as a 4mm bolt.
To make things simpler, bolt sizes are broken down into the letter "M," followed by a number. An M5 bolt for example, is simply a bolt with a five millimetre major diameter.
| Location of bolt | Size of bolt |
| Under tray small | M5 20mm |
| Under tray large | M8 25mm |
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Stockists
South West http://www.hes.uk.com/
Directions, Exit Micheal Wood Services on M5, keep left past hotel, continue 1/4mile along lane, Bussiness Park on the left, park at the bottom.