Four Flute Type C Countersinks
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Fuller Type C Four Flute Countersinks are used to countersink and counter bore for the heads of screws in woods, plastics, and non-ferrous metals. Manufactured of case-hardened carbide steel for long wear, the 82 degree angle is designed to accommodate flat or oval head screws. Drills Bits and Stop Collars are sold separately.
Fuller's Type C Countersinks are heat treated for long tool life. The countersink is held in place with two hex-socket screws and is easily adjustable up and down the drill. As a result, only one countersink and length of drill is required for one screw size. (Drills are not included unless specified.)
You can also use a Type C countersink with a stop collar to drill, countersink, and counterbore in one step.
Recommended Drill Bit sizes | Countersink Diameter | Taper Point Drill | Taper Point Drill | Straight Drill | Straight Drill | |
---|---|---|---|---|---|---|
Screw Size | Cut Size | Hardwood | Softwood | Hardwood | Softwood | Bung Dia. |
2 | 1/4 | 3/32 | 5/64 | 1/16 | 1/16 | 1/4 |
3 | 1/4 | 7/64 | 3/32 | 5/64 | 1/16 | 1/4 |
4 | 1/4 | 7/64 | 3/32 | 5/64 | 1/16 | 1/4 |
5 | 5/16 | 1/8 | 7/64 | 3/32 | 5/64 | 5/16 |
6 | 5/16 | 9/64 | 1/8 | 7/64 | 3/32 | 5/16 |
7 | 3/8 | 5/32 | 9/64 | 7/64 | 3/32 | 5/16 |
8 | 3/8 | 11/64 | 5/32 | 1/8 | 7/64 | 3/8 |
9 | 3/8 | 3/16 | 11/64 | 9/64 | 1/8 | 3/8 |
10 | 7/16 | 13/64 | 3/16 | 9/64 | 1/8 | 7/16 |
12 | 1/2 | 7/32 | 13/64 | 5/32 | 9/64 | 1/2 |
14 | 1/2 | 1/4 | 15/64 | 11/64 | 5/32 | 1/2 |
16 | 5/8 | 9/32 | 17/64 | 3/16 | 11/64 | 5/8 |
18 | 5/8 | 5/16 | 19/64 | 7/32 | 13/64 | 5/8 |
20 | 3/4 | 21/64 | 5/16 | 15/64 | 7/32 | 3/4 |
24 | 7/8 | 3/8 | 3/8 | 17/64 | 1/4 | 7/8 |