Timber Bolts

Also known as dome head, fender head, safety head, mushroom head bolts and economy bolts in the Pacific NW; Timber bolts are used largely in marine and wood applications.
The head of a timber bolt is rounded, bulky and low profile while there are two fins or nubs towards the base of its head. These nubs ascertain that the bolt does not, at any point, turn in the timber. Besides, the bulky head helps cut out on cost because it eliminates the need for a possible malleable iron washer.

Manufacturing

BBI manufactures superior quality timber bolts. With a diameter of 1/2″ – 1-1/2″, these bolts fulfill most specifications of the ASTM, SAE and AASHTO. In fact, we can even create special tooling to help produce nonstandard bolt heads / head dimensions with your preferred logo and/or name.

   


Stock

Grade: A307
Diameters: 3/4″
Lengths: 8″ – 36″ in 2″ increments
Origin: Domestic
Finish: Hot-dip galvanized

Stock Thread Length

Bolt lengths ≤ 12″: 4″ thread
Bolt lengths 14″-16″: 6″ thread
Bolt lengths ≥ 18″: 8″ thread

Timber Bolt Dimensions

Click table to show drawing
Bolt Diameter D F H
Body Diameter Max Head Diameter Head Height
12 0.515 112 14
58 0.642 11516 516
34 0.768 214 38
78 0.895 258 716
1 1.022 278 12
118 1.149 278 12
114 1.277 278 12
138 1.404 3 38
112* 1.531 3 38
* No nubs on underside of head

Stock Timber Bolts

Length Diameter
3/4″
Galv.
8 18549
10 18553
12 18557
14 18561
16 18565
18 18569
20 18573
22 18577
24 18581
26 18583
28 18585
30 18587
32 18589
36 18595
Other sizes and finishes available on request.