Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 132,952 pages of information and 210,197 images on early companies, their products and the people who designed and built them.
of Shell-Mex House, Strand, London, WC2. Telephone: Temple bar 2373. Telegraphic Address: "Aerocessim, London".
of Treforest, Wales - site of factory.
For a full history see Oliver Simmonds.
1931 Oliver Simmonds visited the Paris Air Show and obtained a license for push-pull controls for the rest of the world. On return to the UK he formed Simmonds Aerocessories Ltd, and established a sub-contract manufacturer for the product in Birmingham.
1937 Listed Exhibitor - British Industries Fair. Simmonds Elastic Stop Nut, the universally successful lock-nut. Specialised Engineering and Aeronautical Accessories, including Simmonds Remote Controls, Simmonds Flexi-Clips, Simmonds Cowling Clips, Simmonds Navigational Instruments, Simmonds Jointing Compound, Simmonds Rifix. (Stand No. D.222) 
1937 Aeronautical and engineering accessories. "Simmonds" Elastic Stop Nut. "Simmonds-Corsey" Control. "Simmonds-Goudime" Navigational Instruments. 
1939 See Aircraft Industry Suppliers
1949 Company registered
1955 One of the most important suppliers of accessories to the aircraft, motor, chemical and other industries - products included world famous fastenings, instruments, filters. Advert (1954): FRAM filters, SPIRE speed nuts and fasteners, NYLOC fibre and PINNACLE self-locking nuts.
1962 - 1st May. The company changed its name to Firth Cleveland Fastenings Ltd.