Step 83Bristol 6-Spline Drive
Decades ago, Bristol engineers invented the Bristol Spline Drive System for use in electromechanical instruments. They required screws and wrenches that could stand up to industrial environments, vibrations, and frequent removal and resetting. Excellent for set-screws and smaller cap screws requiring severe tightening, and for screws with shallow sockets. For frequent removal and resetting of screws and plugs, such as for tool inserts, purge screws, drain/filler plugs, template retainers, and replacement of worn parts. Bristol wrenches have been in continuous production in the United States since their original introduction. Thanks fellow Instructable member fernblatt for assistance on these. Usual number of flutes is 6, but some diameters come with 4 flutes. Bristol spline drivers are available from Xcelite/Cooper and are SAE-sized (non-metric). Sized in inches:
0.048, 0.060, 0.069 (4 flute), 0.072, 0.076 (4 flute), 0.096, 0.111, 0.145, 0.183[[br]]
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