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| A
Spherical cap with the flat face adjacent to the shank. This is a form of mushroom head. |
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With an 80-82 angle for use where flush surface is desired. Countersunk section aids centering. |
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| Raised Hexagon Washer Head | Flat Head (100) Countersink) | ||
| A
Thin section of a hexagonal prism with a spherical cap. mounting a thin cylindrical section greater than the A/F dimension of the hexagon |
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Large head distributes pressure over larger and less angular surface. For use with thin aluminum soft plastics. |
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| Clutch Head | Flat Head (Undercut) | ||
| A Countersunk slotted head with two quarters of the head removed so that the screw may be driven in one direction only |
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Standard flat head screw with lower one-third of countersink removed for production of short screws. Permits flush assemblies in thin stock. |
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| Round Pan Head | Flat Top Binding Head | ||
| A Thin cylindrical section, the edge remote from the shank being radiused and surmounted with a spherical cap. |
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Gives large bearing surface with low head height, but poor slot contour. Almost obsolete due to popularity of truss head. |
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| Shallow Cup Head | Hexagon Head (Finished) | ||
| A spherical cap with a flat face adjacent to the shank. |
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Integral washer under head is slightly smaller than diameter across flat; protects the work against disfigurement by head corners during tightening |
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| Square Head | Acorn Head | ||
| A section of a square prism often chamfered on its upper surface. |
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Domed Hexagon locates sockets wrenches quickly. Slot permits screwdriver operation. Combines good appearance, fast assembly protection to work surfaces. |
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| 12 Point Head | Binding Head | ||
| A lightweight head, largely designed for aircraft use with A/F and A/C dimensions much smaller then the hexagon head on male fasteners of corresponding thread sizes. |
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Undercut beneath head binds and eliminates fraying of standard wire in electric work. Ample bearing surface. |
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| Flat Fillister Head | |||
| Similar to standard fillister but without oval top section. Suitable for counter bored holes requiring flush screw. |
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| Fastfix Limited | | | Coes Road Dundalk | | | Co. Louth Ireland | ||||
| 2005 . All rights reserved | ||||||||