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What is left of the fastener decides the tool. If the head has broken off and the shank is buried, a screw extractor bites into a drilled pilot hole and backs it out. If the stud stands proud of the surface, a stud extractor grips the outside and turns it without any drilling at all.
Screw extractors come in two cutting forms. A square type has straight flutes and is driven with a tap wrench, which gives control. A helix type has a spiral flute that pulls itself deeper as it turns, biting harder the more it is resisted. Both are held here in 5, 6 and 7 piece sets. Sealey hold both forms with a tap wrench included on the 6 piece helix set.
Stud extractors are sized on the diameter they grip rather than on a pilot hole. The impact versions run 6 to 12mm on 3/8 inch and 1/2 inch square drive, which lets an impact gun shock the stud loose rather than applying steady torque that would twist it off.
A heavy duty stud extractor at 1/2 inch drive covers 6 to 19mm for larger studs, and a 40 piece set covering bolts, nuts, studs and screws deals with a workshop that meets all four. Drilling accurately on centre is what determines whether a screw extractor works at all. Questions go over WhatsApp on 07754288583. Draper hold a 5 piece screw extractor set and a 6mm stud extractor alongside the larger sets.
| Product Dimenstions (L x W x H) | 140 x 85 x 20 mm |
|---|---|
| Product Weight | 0.125 Kg |
| Product Dimenstions (L x W x H) | 215 x 105 x 40 mm |
|---|---|
| Product Weight | 0.6 Kg |
| Product Dimenstions (L x W x H) | 220 x 140 x 50 mm |
|---|---|
| Product Weight | 0.65 Kg |
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