A thumbscrew resembles a threaded bolt that has a thin, flat head that enables it to be turned with the thumb and index finger.
The head of a shoulderless thumbscrew is larger than that off the shouldered version.
Shoulderless thumbscrews are available with a metric coarse head with a zinc plated finish.
We also currently have a small number of thumbscrews with a BS Whitworth imperial thread, in a self-coloured steel finish.
Metric is the most common thread type in production today. Usually specified as M then a number x another number. This signifies the thread diameter and the length of the fastener.
For example, M4 x 30 means that the major thread diameter (the external distance across the outside of the thread) is 4mm and the length is 30mm. Length is usually measured from the underside of the fastener head.
This section of our guides and tips hub contains a large variety of informational articles relating to all of the products within our nuts and bolts ranges. These articles range anywhere from providing product specification details to answering frequently asked questions about specific products.
