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Square Drive Screws

Square Drive Screws

As these products are sold I am NOT RE-STOCKING

Once sold reference to the product will be removed from the web site

Offers to purchase as one lot seriously considered

 

Square Drive Screws by Robertson: The perfect screw for veteran and vintage car timber framing work

       
Square Drive Screws invented by P. L. Robertson in 1908, have been in use since then.
The USA and Canadian motor body building industry throughout the days of timber framing used Square Drive Screws
to improve and strengthen the joints made, reduce build time with minimum cam-out of the driver as shown on the graph above.

Features of the Robertson Square Drive Screws: 
Reduce cracking and bursting of the wood with the sharp thread angle
Optimised thread depth to thread spacing ratio to minimise crumbling between threads
Thread surface is nearly perpendicular to the thread axis to provide greatest resistance to pullout
Minimum body diameter causes least possible material distortion
Sharp point and rapid rise provide easy penetration and a full thread within just one revolution
Square recess provides maximum driving torque - reduces driver bit cam-out
     

Flat Head (Countersunk) Screws
Flat Head (Countersunk) Screws
Pan Head Screws
Pan Head Screws
Washer (Truss) Head Screws
Washer (Truss) Head Screws
Trim Head Screws
Trim Head Screws
Cross-Threaded Steel Dowels
Cross-Threaded Steel Dowels
Hand Drivers
Hand Drivers
Power Driver Bits
Power Driver Bits
Square Drive Screw Information Guide
Square Drive Screw Information Guide
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