Need 8-36 screw 2-1/2" long

Installing an old mortise lockset into a front door. Lockset was purchased= (quite pricey with door knobs, cover plates etc.) from a restoration hardw= are place. They reconditioned all the parts and patinated (sp?) them all t= o look similar.

Problem: The threaded lock cylinder needs to be fixed from rotation with a = radially applied screw that is over 2-1/4 inches long. The existing thread= s in the bronze casing is 8-32. I have three choices:

1) Find a screw of the proper length and 8-36 thread with a fillister head= =20 2) Find any long 8-36 screw and turn down the head to fit the hole 3) Re-tap the threads for 8-32 which opens a whole world of screws.

The problem with option 3 is that all of my 8-32 taps (I have over 50) are = about a 1/4 to a 1/2 inch too short. Have any of you successfully lengthen= ed an existing tap? I have mig, tig & oxy but am worried about axial align= ment on the tap extension. =20

What are the probable result of re-tapping an 8-36 to an 8-32 in bronze? W= ill I end up with a crappy loose thread fit?

BTW, tried McMaster-Carr and Fastenall. At McMaster I cannot find 8-36. A= t Fastenall, I do find 8-36 but maximum length is 1-1/4 inches. I would ne= ed to buy quantity 100 but at least I would get to practice my screw-length= ening skills which should be easier than tap-lengthening.

All advice appreciated.

Ivan Vegvary

Reply to
Ivan Vegvary
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Ask around (with the name of the lockset manufacturer in hand) at the local locksmiths. The old ones are often packrats.

If local doesn't do it, ask at "alt.locksmithing".

Joe Gwinn

Reply to
Joseph Gwinn

ased (quite pricey with door knobs, cover plates etc.) from a restoration h= ardware place. =A0They reconditioned all the parts and patinated (sp?) them= all to look similar.

a radially applied screw that is over 2-1/4 inches long. =A0The existing th= reads in the bronze casing is 8-32. =A0I have three choices:

e about a 1/4 to a 1/2 inch too short. =A0Have any of you successfully leng= thened an existing tap? =A0I have mig, tig & oxy but am worried about axial= alignment on the tap extension. =A0

=A0Will I end up with a crappy loose thread fit?

. =A0At Fastenall, I do find 8-36 but maximum length is 1-1/4 inches. =A0I = would need to buy quantity 100 but at least I would get to practice my scre= w-lengthening skills which should be easier than tap-lengthening.

McMaster Carr lists a carbon steel 8-36 die for $11.80

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Reply to
Denis G.

chased (quite pricey with door knobs, cover plates etc.) from a restoration= hardware place. =A0They reconditioned all the parts and patinated (sp?) th= em all to look similar.

h a radially applied screw that is over 2-1/4 inches long. =A0The existing = threads in the bronze casing is 8-32. =A0I have three choices:

are about a 1/4 to a 1/2 inch too short. =A0Have any of you successfully le= ngthened an existing tap? =A0I have mig, tig & oxy but am worried about axi= al alignment on the tap extension. =A0

? =A0Will I end up with a crappy loose thread fit?

  1. =A0At Fastenall, I do find 8-36 but maximum length is 1-1/4 inches. =A0= I would need to buy quantity 100 but at least I would get to practice my sc= rew-lengthening skills which should be easier than tap-lengthening.

Which was what I was going to suggest, make one. This is what lathes are for. Chances are you only need a short length of thread at the end, the rest just needs to be clearance sized for the hole. 8-36 is a standard thread, just not used a whole lot. Only other place I've seen that thread is on GI M16 cleaning rods.

Stan

Reply to
stans4

urchased (quite pricey with door knobs, cover plates etc.) from a restorati= on hardware place. =A0They reconditioned all the parts and patinated (sp?) = them all to look similar.

ith a radially applied screw that is over 2-1/4 inches long. =A0The existin= g threads in the bronze casing is 8-32. =A0I have three choices:

) are about a 1/4 to a 1/2 inch too short. =A0Have any of you successfully = lengthened an existing tap? =A0I have mig, tig & oxy but am worried about a= xial alignment on the tap extension. =A0

ze? =A0Will I end up with a crappy loose thread fit?

8-36. =A0At Fastenall, I do find 8-36 but maximum length is 1-1/4 inches. = =A0I would need to buy quantity 100 but at least I would get to practice my= screw-lengthening skills which should be easier than tap-lengthening.

I agree. Something like this is a good excuse to practice single point threading. I wasn't sure what equipment the OP had or the required length of the threaded part. Ergo, the die option seemed like a good choice.

Reply to
Denis G.

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