grip screw tap

G.T. · 09-26-2022, 12:27 AM

Hi to all, I need a tap for P.08 grip screw thread and over the years I know some of the forum members had some made? I sure could use one now... They are #10 X 30 and taps #10 X 24 & #10 X 32 won't work! Anyway, let me know at gctomeks@msn.com best, til...lat'r....GT....

ithacaartist · 09-26-2022, 06:04 AM

A few years back there was a thread about the issue of buggered grip screw threads in frames, what the original tapping was, etc. It's a Whitworth thread, and maybe someone can recall the exact diameter and pitch is on the plans John Sabato cleaned up and sold on CD.

I don't at the moment recall exactly how, but I found a source and bought one to chase out the threads on my 1906 AE shooter. At the moment, the tap's exact whereabouts in my stuff are still to be determined, but it's in the gun room for sure.

Even though it's just a few threads, and the S.A.E. taps come pretty close to spec, they're not right. I think attempts to run screws of pitches other than original into the tappings distorts the threads and makes them cranky at accepting original screws thereafter.

mrerick · 09-26-2022, 10:15 AM

The grip screws use a "Whitworth" British thread profile. it changes the angle of the thread.

https://www.boltscience.com/pages/screw4.htm

https://www.practicalmachinist.com/f...screws.221376/

You will find the taps listed in a google search. Sometimes the taps are on Ebay.

Here is the fabrication specification for the screws (courtesy of John S.'s blueprint files):

G.T. · 09-27-2022, 01:41 PM

Hi to all, sadly, I have exhausted all those resources, and they either don't have, and are not going to have... or, they are too expensive, say as in $200.00 bucks!!!!

Soooo, if any one runs across one in the future, I'm your huckleberry! Best to all, til.....lat'r.....GT....

Karl · 09-27-2022, 04:01 PM

G.T.,

Does this help?
http://www.hemingwaykits.com/acatalo...ary_Items.html

KFS

G.T. · 09-27-2022, 04:49 PM

They have a 5/16" but not 3/16" sooo, we keep looking.... Thanks Karl, best, til...lat'r....GT....

Deputywood · 09-27-2022, 06:51 PM

You can make a tap for limited use to chase and clean up an existing thread. Have someone familiar with a lathe cut the thread and harden it. Screw it in from the inside so that it starts straight and run it in.

09-26-2022, 06:04 AM	#2
ithacaartist Twice a Lifer Lifetime Forum Patron Join Date: Mar 2011 Location: Atop the highest hill in Schuyler County NY Posts: 3,343 Thanks: 7,264 Thanked 2,576 Times in 1,364 Posts	A few years back there was a thread about the issue of buggered grip screw threads in frames, what the original tapping was, etc. It's a Whitworth thread, and maybe someone can recall the exact diameter and pitch is on the plans John Sabato cleaned up and sold on CD. I don't at the moment recall exactly how, but I found a source and bought one to chase out the threads on my 1906 AE shooter. At the moment, the tap's exact whereabouts in my stuff are still to be determined, but it's in the gun room for sure. Even though it's just a few threads, and the S.A.E. taps come pretty close to spec, they're not right. I think attempts to run screws of pitches other than original into the tappings distorts the threads and makes them cranky at accepting original screws thereafter. __________________ "... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894

09-26-2022, 10:15 AM	#3
mrerick Super Moderator - Patron LugerForum Life Patron Join Date: Dec 2009 Location: Eastern North Carolina, USA Posts: 3,909 Thanks: 1,374 Thanked 3,110 Times in 1,510 Posts	The grip screws use a "Whitworth" British thread profile. it changes the angle of the thread. https://www.boltscience.com/pages/screw4.htm https://www.practicalmachinist.com/f...screws.221376/ You will find the taps listed in a google search. Sometimes the taps are on Ebay. Here is the fabrication specification for the screws (courtesy of John S.'s blueprint files): Attached Thumbnails __________________ Igitur si vis pacem, para bellum - - Therefore if you want peace, prepare for war.

09-27-2022, 01:41 PM	#4
G.T. Lifer Lifetime Forum Patron Join Date: Jun 2002 Location: Chandler Arizona Posts: 3,507 Thanks: 1,318 Thanked 3,653 Times in 1,004 Posts	none to be had! Hi to all, sadly, I have exhausted all those resources, and they either don't have, and are not going to have... or, they are too expensive, say as in $200.00 bucks!!!! Soooo, if any one runs across one in the future, I'm your huckleberry! Best to all, til.....lat'r.....GT....

09-27-2022, 04:49 PM	#6
G.T. Lifer Lifetime Forum Patron Join Date: Jun 2002 Location: Chandler Arizona Posts: 3,507 Thanks: 1,318 Thanked 3,653 Times in 1,004 Posts	close, but no... They have a 5/16" but not 3/16" sooo, we keep looking.... Thanks Karl, best, til...lat'r....GT....

09-26-2022, 12:27 AM	#1
G.T. Lifer Lifetime Forum Patron Join Date: Jun 2002 Location: Chandler Arizona Posts: 3,507 Thanks: 1,318 Thanked 3,653 Times in 1,004 Posts	grip screw tap Hi to all, I need a tap for P.08 grip screw thread and over the years I know some of the forum members had some made? I sure could use one now... They are #10 X 30 and taps #10 X 24 & #10 X 32 won't work! Anyway, let me know at gctomeks@msn.com best, til...lat'r....GT....

09-27-2022, 04:01 PM	#5
Karl Lifer - Twice Over Lifetime Forum Patron Join Date: Jun 2002 Location: Savannah Posts: 520 Thanks: 0 Thanked 266 Times in 116 Posts	G.T., Does this help? http://www.hemingwaykits.com/acatalo...ary_Items.html KFS

09-27-2022, 06:51 PM	#7
Deputywood User Join Date: Apr 2022 Posts: 73 Thanks: 74 Thanked 87 Times in 36 Posts	You can make a tap for limited use to chase and clean up an existing thread. Have someone familiar with a lathe cut the thread and harden it. Screw it in from the inside so that it starts straight and run it in.