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Screw Extractor
To extract a broken stud or screw, drill a hole in the screw, insert the largest possible screw extractor and turn anti-clockwise. The corkscrew teeth will release the broken screw, leaving the original thread in tne hole undamaged.

Drill Size 'A'-: For screw or studs of low or medium tensile strenght.

Drill Size 'B'-: For screw or studs of high (75 tons/sq. in .or over ) tensile strenght.

Screw Drill to Use Extractor
A B
1/8 & 3/16' 5/64" 5/64" 1
1/4 7/64" 1/8" 2
5/16 & 3/8" 5/32" 11/64" 3
7/16' 7/32" 15/64" 4
1/2 & 9/16" 9/32" 5/16" 5
5/8 & 3/4" 13/32" 7/16" 6


N.B:- The nearest metric equivalent drill may be used for drilling holes if fractional size are not available.