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Ada01 12-20-2011 01:13 PM

Blank Bolts and Thread Conversion

First, is it possible to get blank bolts ones without threads and thread them yourself?

Second, Is 3/8-27 Tab/Die the same ting as 1/8 IP threads found on lamp parts?


joecaption 12-20-2011 01:30 PM

What is it your really trying to do? There may be a simpler way to do it.

DrHicks 12-20-2011 01:45 PM

I've never seen un-threaded bolts - at least not for sale.

I suppose you could buy extra long bolts, cut off the threaded part, and thread the extensions yourself.

DexterII 12-20-2011 02:06 PM

No, I have never seen nor heard of "blank bolts" for the do-it-yourselfer, but, on the other hand, yes, for special applications, i.e. shoulder bolts from an old pice of equipment, etc., which I could not find elsewhere, I have started with a piece of steel, and made bolts in my shop, but it requires a lathe and proper tooling. As Joe said though, it might to help to know what are you doing, because unless it is something really unique, there is most likely something available already, so that you wouldn't have to invest several thousand dollars in machines and tools to make one or two bolts.

Bondo 12-20-2011 02:53 PM


Originally Posted by Ada01 (Post 798542)

First, is it possible to get blank bolts ones without threads and thread them yourself?

Second, Is 3/8-27 Tab/Die the same ting as 1/8 IP threads found on lamp parts?


Ayuh,.... Yes, 'n No....

The thread count is in fact the same,...
Pipe threads, 'n their dies are Tapered....

Lamp parts are Not....
You'd need a die built Without the taper...

PoleCat 12-21-2011 08:34 AM

Lamp stock is its own special thread. You can probably find a supplier that offers just what you need online. You may even be able to buy tap & die that cuts it. Ace hardware carries a nice selection of pieces usually.

Ada01 12-21-2011 11:48 AM

@joecaption: what I am trying to accomplish is an aesthetic look for a project I got myself into for a client. I need the finished look of a bolt or socket cap screw (per their request) to attach some candelabra sockets:

The attachment points are visible and the threaded rod, with the standard locknut was not going to work. I have not been able to find 1/8 IP bolts, so I was going for a die and blank to make my own.

3/8" x <1/2" long...not easy to come by!


DexterII 12-21-2011 12:03 PM

How about stacking two or three nuts, with the flats lined up, and the gaps filled with an epoxy or other filler, to create the illusion of a bolt head?

joed 12-21-2011 01:07 PM

Try google 'lamp parts'.
Lots of parts here.

High Gear 12-21-2011 05:45 PM

1/8 IPS ( iron pipe straight ) ='s .405" OD , not a common bolt size.

Surely Joeds link will have what you need.

If you truely need a custom part a machine shop with a cnc lathe with live tooling ( ie milling axis) can fix you up for a price .

I've made custom cnc'd bolts no bigger than a pencil earaser that the

company had charged $50.00 a piece for ( quantity of 2 ).

Economics of scale rule as the price drops dramaticely with larger quantities.

Most bolts are cold headed ..meaning they're formed to their configeration

by a series of blows to a slug of wire against a sreies of dies.

Then the threads are rolled on by pressure between roll thread dies.

Thurman 12-23-2011 09:48 AM

Bolt blanks can be bought for some fastener manufacturer's, but the minimal quantity may be more than you would want. If you are looking for a bolt that has the threads cut all the way to the head, try looking for a "tap bolt". Now--the threaded rod used in chandelier's, lamps, electrical work is a somewhat "special application" thread, although common in the lighting industry. You can purchase these "electrical threaded rods" in lengths to seventy-two inches (72") from many sources. "High Gear" is correct in that most bolts are made from "cold forming" and have rolled threads, not cut-which would remove metal which would be wasting money that the fastener manufacturing business.

High Gear 12-23-2011 01:58 PM

I've been machining since 76 with the last 12 yrs supporting

( manufacturing tooling for the cold heading industry ) or working along side of it ( cnc custom fasteners for the military, aerospace ect.).

Like everthing else it's become a thankless job but I got to eat.

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