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