Quick$crews® Fastener Guide
Page 2 Head Styles
Flat Heads
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| FL | .275 O.D. FL | FL Nib | BU | UC | |||||
| Flat | .275 Outside Diameter Flat | Flat Head with Nibs | Bugle | Undercut Flat | |||||
| Oval Head |  |
Pan Heads | |
Truss Head | ||
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| OV | PN | MOD-PN | LOW-PN | TR | ||
| Oval | Pan | Low Profile Pan | Low Profile Pan | Truss | ||
Round washer Heads
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| RWH | LRWH | LOW-RWH |
| Round Washer | Large Round Washer | Low Profile Round Washer |
Head Specifications
| Flat Heads | ||||
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| Size | Head Diameter | Driver Size | ||
Max. |
Min. |
PH |
CO/SQ |
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#4 |
.225 |
.195 |
1 |
- |
#5 |
.252 |
.220 |
2R |
- |
#6 |
.255 |
.240 |
2R |
SQ2 |
#6 Large |
.279 |
.260 |
2R |
SQ2 |
#7 |
.295 |
.267 |
2R |
SQ2 |
#8 |
.332 |
.292 |
2R |
SQ2 |
#9 |
.335 |
.295 |
2 |
SQ2 |
| #10 | .385 |
.340 |
2 |
SQ2 |
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Did you Know ¿?
The football huddle was first used in the 19th century by a team at the college for the deaf.
The square drive was invented in 1908 & the Phillips drive was invented in the early 1930s.