Miss Tisha,Good to see you are still active.
I thought that everyone knew about Bristol spline.... I have had a set since
about 1961.CheersR
On Monday, June 15, 2026 at 11:14:00 PM EDT, Tisha Hayes via R-390
<[email protected]> wrote:
The R-390/ 390A use set-screws that are designed for a much higher torque
application.
It is known as a "Bristol-Spline" screw head. It may look like a hex or a
little like a TORX but the internals are all right-angles instead of
triangular or hexagonal faces.
The old Xcelite tool-set included Bristol-Spline bits, back in the day most
people had no idea what to do with the Bristol Spline bits.
The reason for Bristol-Spline is that when tightened it will not cam-out
(strip) like a hex bit will.
*Ms. Tisha Hayes, AA4HA*
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