Hot Dipped Galvanized A307 Timber Bolt Dome Head 4 Fins Neck Timber Bolt
• Timber bolts are commonly referred to as dome head, fender head, safety head, and mushroom head bolts.
• The underside of the large, rounded, low-profile head of timber bolt has two nubs or fins which prevent the bolt
from turning in the timber (usually between two and four nubs).
• The over-sized head of the timber bolt eliminates the need for a washer on the bolt head end, therefore reducing costs.
• Timber bolts are typically manufactured in diameters ranging from ½” through 1-1/2”. with lengths ranging from
4” up to 36”.
• Timber bolts are most frequently hot-dip galvanized and manufactured to meet the requirements of ASTM A307 grade A.
Stainless steel and high strength ASTM A449 timber bolts are also used for special applications.
• Timber bolt are frequently used in both wood and marine applications,
Drawing:
| Bolt Diameter | D | F | H |
| Body Diameter Max | Head Diameter | Head Height | |
| 1⁄2 | 0.515 | 11⁄2 | 1⁄4 |
| 5⁄8 | 0.642 | 115⁄16 | 5⁄16 |
| 3⁄4 | 0.768 | 21⁄4 | 3⁄8 |
| 7⁄8 | 0.895 | 25⁄8 | 7⁄16 |
| 1 | 1.022 | 27⁄8 | 1⁄2 |
| 11⁄8 | 1.149 | 27⁄8 | 1⁄2 |
| 11⁄4 | 1.277 | 27⁄8 | 1⁄2 |
| 13⁄8 | 1.404 | 3 | 3⁄8 |
| 11⁄2 | 1.531 | 3 | 3⁄8 |
|
Length |
|||||||
|
A |
B |
C |
D |
E |
F |
From To |
|
|
1/2" |
1-3/4" |
.275" |
1/4" |
6" |
0.2 |
6" |
24" |
|
5/8" |
2-1/4" |
5/16" |
5/8" |
6" |
1/4" |
6" |
28" |
|
3/4" |
2-5/8" |
7/16" |
3/4" |
6" |
1/4" |
6" |
36" |
|
7/8" |
3" |
1/2" |
7/8" |
6" |
9/32" |
12" |
40" |
|
1" |
3" |
1/2" |
1" |
6" |
5/16" |
10" |
40" |
|
1-1/4" |
3-1/2" |
1/2" |
1" |
8" |
5/16" |
18" |
34" |
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