Timber Bolts

timber-bolt-dim-500

icon-285Timber bolts, also known as economy bolts, dome head bolts, or mushroom head bolts, are commonly used in wood dock construction. The underside of the large, rounded, low-profile head of a timber bolt has two nubs or fins which prevent the bolt from turning in the timber. Timber bolts are typically manufactured in diameters ranging from ½” through 1-1/2”. 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.

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