John Joseph Rawlings (1 June 1860 – 4 August 1942) was a British mechanical engineer and inventor of the wall plug, also known from his name as the rawlplug.
The deeper the screw penetrated, the more the fibre expanded and the greater the grip against the masonry.
The jute was replaced by a thermoplastic plug in the 1960s, injection moulded singly, or in multiples attached together by the original sprue.
[2] The company went on to develop the Rawlbolt, a fitting with similar function but much greater size and strength.
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