Screw Head Types
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The information below shows the various head types of screws.
Commonly used on wood and self tapping screws where a smooth surface is required, but also used on machine screws with a slotted or hexagon drive.
Most commonly seen on wood and self tapping screws.
Again commonly seen on wood screws, does allow for a deeper slot than pan heads.
Often used to give a wider load surface, usually with a slotted drive.
Not so common as a pan head, but does allow for a deep slot.
RAISED CHEESE HEAD
Not very commonly used, but does allow for a deep slot.
Usually driven with a recess drive, ie hexagon, torx or pentagon drive. commonly supplied as self tapping or machine screws.
Commonly seen with a slot or crossed slot, used mainly on roofing bolts.
Commonly used in the agricultural and building trades, stops rotation.
Commonly used, available in standard and low head form. usually supplied with a recess hexagon or splined drive.
FLANGED CAP HEAD
Used more in production enviroment as they save fitting an additional washer. flanges can have serrated face to aid anti vibration.
The most common form of head on bolts, available in a range of tensile strengths.
HEXAGON WASHER FACED HEAD
Used more on high tensile bolts.
FLANGED HEXAGON HEAD
used more in production enviroment as they save fitting an additional washer. flanges can have serrated face to aid anti vibration.
Most commonly used in to match existing bolts, or the give a rustic feel. replaced by hexagon heads.
Used as a bolt head in a channel or groove, stops rotation allowing the nut to be tightened without a tool on the bolt head.