Description
Features Size 4 Screw Extractor + LH Stub Drill Chrome alloy spiral screw extractor. Coarse-pitched tapered screw thread. Spiral flute screw extractors are ideally suited for removing broken bolts, studs & socket screws from medium to hard metals. Typically the required screw extractor will be approx. 2/3 the diameter of the fixing you are extracting. Use a centre punch to mark the centre of the fixing before drilling to prevent the drill bit wandering. Select a drill bit that is suitable for drilling into the specific material – typically HSS or HSS-Co5. Ideally the drill should be "Left Hand" which will prevent further tightening of the fixing during drilling. When using left hand drills ENSURE THE DRILL IS SET TO REVERSE. Drill pilot hole in centre of broken bolt, screw or stud. Lightly tap screw extractor into hole and turn anti-clockwise with a tap wrench or spanner. Damaged bolt, screw or stud will unwind out of the hole. Avoid excessive lateral loads – breakage could result. Wear eye and hearing protection. Specifications For Bolt (inch): 3/8-1/2 For Bolt (mm): 10-12 Pilot Drill (inch): 1/4 Pilot Drill (mm): 6.35 Size: 4
