15" Long Bolt

Bolt Stretcher

What do you do when you need a very long bolt? Most hardware stores only stock bolts up to about 10″ or 12″ in the sizes most woodworkers use — 1/4″, 5/16″,  3/8″ and 1/2″ diameter.

Time to break out the bolt stretcher?

Assuming you don’t have such a mythical machine you can make your own longer bolts.

Start with some threaded rod and appropriately sized nuts…

Filing off the rough machined edge
Filing off the rough machined edge

File off any paint and machine/mill marks from the end of the threaded rod.

TIP: Place a nut a 1/2 in or so down onto the threaded rod before filing. Once you finish your filing you can remove the nut, and in the process will clean out the top threads which may have been deformed by the filing. Use should also use this technique when cutting threaded rod or bolts.

Why do I need such a long bolt?

In this case, I am building a workbench with a shoulder vise — this bolt helps make sure the massive vise screw does not blow out the wood joinery.

From Tage Frid Teaches Woodworking Volume 3 he suggest brazing a nut onto the end of a threaded rod, so I figured I’d give that a shot…

Mapp + Oxygen cutting and welding torch used for brazing
Mapp + Oxygen cutting and welding torch used for brazing

Time to break out the Mapp + Oxygen cutting/welding/brazing torch and some brazing rod which works much like solder. (Make sure you work in a well ventilated space and take all necessary safety precautions). Clean the mating surfaces and apply flux, then braze the nut to the threaded rod.

Brazed nut
Brazed nut

Once it cools down you can file off any excess and use this newly made bolt. I’m no expert on welding, but the amount of hardware, time, and cleanup seemed excessive. Even with some filing, wire brush work and then some polishing I was not happy with the result — this end of the bolt would be visible in the finished bench. The coloring was off and now the nut looked a little off.

Is there another way?

I thought back to my days working on my Mustang and old F-150 and a remembered good old Locktite Red Threadlocker 271.

Locktite 271 Red Threadlocker
Locktite 271 Red Threadlocker

This little tube packs a heck of a grip. You apply some threadlocker on the threads and inside of the nut, put them together and let it cure for 24 hours. You would need to exceed 500 degrees F and 245 ft/lbs of torque in order to break the bond — so in other words, plenty of strength for my use.

Threadlocker curing
Threadlocker curing

Once cured I cut the bolt to length, filed off the hacksaw marks and cleaned up the leading threads using the tip above.

15" Long Bolt
15″ Long Bolt

Now I have a nice custom sized bolt ready to go. If the need arises I hope you’ll give these techniques a try. If you do, let me know in the comments.

Take care,

2 thoughts on “Bolt Stretcher”

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