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#4585603 - 11/26/17 01:17 PM Seized set screw removal
JHZR2 Offline



Registered: 12/14/02
Posts: 41896
Loc: New Jersey
On 1920s-ish hardware on a same age door.

Knobs were loose, but set screw was stuck. Someone long ago already stripped the screw thread, so Ive tried to remove it.

Kroil, ATF, etc don't help. I assume there's a combo of human oils, chemical bonding, etc.

Going to break the extractor if I try any harder.

So what's next??



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#4585608 - 11/26/17 01:21 PM Re: Siezed set screw removal [Re: JHZR2]
Warstud Offline


Registered: 09/02/05
Posts: 5502
Loc: MIchigan
Drill it out.

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#4585626 - 11/26/17 01:38 PM Re: Siezed set screw removal [Re: JHZR2]
JHZR2 Offline



Registered: 12/14/02
Posts: 41896
Loc: New Jersey
Pardon my ignorance, isn't that what I did?

I used a #2 extractor with a hole pre drilled. Used a slightly undersized hole so the extractor had more bite and less chance to bottom out.

A shallow extractor bites but distorts the brass around the screw vs removing it. Ask how I know frown

New set screw will be 1/4-20, are you implying to just drill and tap as is?

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#4585633 - 11/26/17 01:46 PM Re: Siezed set screw removal [Re: Warstud]
FlyNavyP3 Offline


Registered: 07/04/16
Posts: 1431
Loc: Jacksonville, FL
Originally Posted By: Warstud
Drill it out.


I agree.

To answer your follow on question I think what Warstud was saying and what I'm suggesting is to drill the set screw in your drill press as you end already done for the tap drill size for the size of the set screw, then tap and use a new set screw. No need to go over size from original, just make new threads.
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#4585640 - 11/26/17 01:50 PM Re: Siezed set screw removal [Re: JHZR2]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
That's the wrong kind of extractor. What those kind do is exert outward force on the fastener as you turn it to the left. Counterproductive is the word I use to describe those kind of extractors.

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#4585643 - 11/26/17 01:52 PM Re: Siezed set screw removal [Re: JHZR2]
andyd Offline


Registered: 09/25/04
Posts: 7289
Loc: Marshfield , MA
Back that extractor out before it snaps. Continue to drill going up in size gradually until there is no screw left. Then tap, I would use the smallest over size possible. a 10-32, 12-24 3/16? I'm surprised you don't have a set of left hand bits. Not that I've had any success with my LH index grin2
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#4585673 - 11/26/17 02:21 PM Re: Siezed set screw removal [Re: JHZR2]
Rick in PA Offline


Registered: 01/04/03
Posts: 3203
Loc: Southeastern, PA
I'd keep up-sizing the drills gradually. If you get lucky, the threads on the old set screw can be picked out like a spring. I've seen it done. Then clean up the threads on the door knob with a tap of the same size threads and you're good-to-go.

That was a popular style door knob. We have the same ones in our house.


Edited by Rick in PA (11/26/17 02:23 PM)
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#4585689 - 11/26/17 02:47 PM Re: Siezed set screw removal [Re: Merkava_4]
JHZR2 Offline



Registered: 12/14/02
Posts: 41896
Loc: New Jersey
Originally Posted By: Merkava_4
That's the wrong kind of extractor. What those kind do is exert outward force on the fastener as you turn it to the left. Counterproductive is the word I use to describe those kind of extractors.


Yup, observed that, though from one of the "seen on tv" types HD sells. Thought a more aggressive taper (get fatter in shorter distance) was good given that I can't get the rod out.

The brass gave easily as a result.

So what is the better kind of extractor. For me and for this sort of a job I certainly don't mind paying good money upfront to have the right tool and do a proper job with minimal hang ups.

I like DIY and on Sunday my time isn't money, but I don't care to waste my day if there's a better tool.

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#4585692 - 11/26/17 02:48 PM Re: Siezed set screw removal [Re: andyd]
JHZR2 Offline



Registered: 12/14/02
Posts: 41896
Loc: New Jersey
Originally Posted By: andyd
Back that extractor out before it snaps. Continue to drill going up in size gradually until there is no screw left. Then tap, I would use the smallest over size possible. a 10-32, 12-24 3/16? I'm surprised you don't have a set of left hand bits. Not that I've had any success with my LH index grin2


Don't have left hand bits. But then again, my 1950s dp is one way only smile

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#4585725 - 11/26/17 03:08 PM Re: Siezed set screw removal [Re: Rick in PA]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: Rick in PA
I'd keep up-sizing the drills gradually. If you get lucky, the threads on the old set screw can be picked out like a spring. I've seen it done.


Exactly - it just takes time, precision.... and a LOT of patience.

It saves the original threads.
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#4585729 - 11/26/17 03:10 PM Re: Siezed set screw removal [Re: JHZR2]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: JHZR2

So what is the better kind of extractor. For me and for this sort of a job I certainly don't mind paying good money upfront to have the right tool and do a proper job


this kind:

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(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4585746 - 11/26/17 03:26 PM Re: Siezed set screw removal [Re: JHZR2]
JHZR2 Offline



Registered: 12/14/02
Posts: 41896
Loc: New Jersey
Is there a name for those?

Even snap on seems to be selling spiral/multi-spline types.

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#4585865 - 11/26/17 04:46 PM Re: Siezed set screw removal [Re: JHZR2]
JHZR2 Offline



Registered: 12/14/02
Posts: 41896
Loc: New Jersey
Drilled out to #7 then tapped to 1/4-20. Success.

It was crooked, not sure how I could do that better - I was a bit sensitive to clamping the handle in a vice.



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#4585891 - 11/26/17 05:03 PM Re: Siezed set screw removal [Re: JHZR2]
car51 Offline


Registered: 03/12/15
Posts: 10380
Loc: Southwest PA
Very nice work and fix sir smile
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#4585892 - 11/26/17 05:05 PM Re: Siezed set screw removal [Re: JHZR2]
spasm3 Offline


Registered: 05/30/10
Posts: 8782
Loc: North Carolina
Nice work! I would not have clamped it in a vise either. Crooked won't matter for that, with the set screw in, you will never know.
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