The originators of the superior Bristol multiple spline drive wrenches for socket screws offer a wide range of spline wrench sizes and styles. Quality hex wrenches are also manufactured, with a focus on custom hex keys and bits.

ALL PRODUCTS ARE MADE IN THE USA

DESIGN

Decades ago, Bristol engineers invented the Bristol Spline Drive System for use in electro-mechanical instruments. They required screws and wrenches that could stand up to industrial environments, vibrations, and frequent removal and resetting. The effectiveness of their invention, for that original application and thousands more since, has never been surpassed.

PRODUCTS

Bristol wrenches have been in continuous production in the United States since their original introduction. Bristol Wrench Co. utilizes proven methods to manufacture quality spline and hex wrenches, focusing foremost on producing the most effective wrenches possible.

BRISTOL SPLINE DRIVE

The substantial and effective wrench engagement inherent in the Bristol design addresses the problems caused by other systems such as cam-out, socket reaming and rounding of wrenches. Pioneered by Bristol, the multiple spline drive system is recognized by design engineers as the superior method of transmitting torque because nearly 100% of wrenching force is applied at right angles to the load bearing spline surfaces of the socket. Other drive systems dissipate a significant amount of force into radial thrust tending to expand the socket rather than tighten the screw.

BRISTOL SPLINE DRIVE SUGGESTED APPLICATIONS

Excellent for demanding applications
Especially indicated 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
In applications requiring softer screws such as stainless steel or nonferrous materials

HEX DRIVE

Adequate for many applications, other drive systems such as this common hex design are not as positive or effective methods of transmitting torque as the Bristol Spline configuration. To increase performance and durability, Bristol Wrench manufactures hex wrenches in sizes .028" through 3/8" diameter and larger from precisely shaped 8650 steel. We specialize in custom hex keys and bits.

HEX DRIVE APPLICATIONS

Adequate for many applications where some loss of tightening force into radial thrust can be tolerated
Not recommended when severe tightening of small parts is required
Not recommended when frequent removal and resetting is required
Not recommended for use with softer components