Truncated cone Brass Bolt & Nut Sets
For a relatively brief period in the mid to late 19th century, Disston and other saw makers adorned some of their saws with bolts and nuts whose heads are best described as truncated cones. With their hardware standing well proud of the handle, these saws possess a bold and distinctive air.
Because they soon fell out of favor, replacement bolts and nuts for these saws are hard to come by. Now, 150 years later, Blackburn Tools offers a modern version of this hardware. These new bolts are available in large and small variants. For those making new handles, this is very simple and forgiving hardware. Because the heads are not sunk into counterbored holes, a clean installation is not dependent on precisely drilled holes. To further ease installation, the slots on these nuts (unlike those on split nuts) require no specialized screwdriver or spanner. The bolts have square shanks that can be mortised into the handle to prevent rotation when tightening the nut.
Threads are 8 - 32 UNC. Both bolts fit saw handles ranging from 9/16 inch (14.3 mm) to 1-1/16 inch (27 mm) in thickness. You will need to cut or file the threaded portion to length, a relatively simple task. Instructions for doing so are below.
Dimensions of large type: The nut has a slot that is 0.050 inch (1.3 mm) wide and 2 mm deep, and requires no specialized screwdriver or spanner. To avoid mangling the slot, please select a properly fitted screwdriver. The maximum diameter of the bolt and nut heads are 0.530 inch (13.5 mm); their heights are 0.205 inch (5.2 mm). The bolt shank is 0.160 inch (4.1 mm) square.
Dimensions of small type: The nut has a slot that is 0.032 inch (0.8 mm) wide and 1.4 mm deep, and requires no specialized screwdriver or spanner. To avoid mangling the slot, please select a properly fitted screwdriver (this may require some grinding of the blade to thin it out). The maximum diameter of the bolt and nut heads are 0.430 inch (10.9 mm); their heights are 0.125 inch (3.2 mm). The bolt shank is 3/16 inch (4.8 mm) square. You are right: wider than the large type!
Installation notes: Measure the thickness of the handle (including any washers that will be used under the heads of the bolts and nuts). This is the length to which the shank of the bolt will be cut. The bolt can be shortened with either a hacksaw or file. After cutting or filing, round the cutted edge of the thread slightly with a file. Filing the edge makes it easier to thread the nut onto the bolt.
|Truncated cone Sets
Bolt & Nut
|7/16 inch (11.1 mm)
|17/32 inch (13.5 mm)