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9-40 Tang Screws (Read 603 times)

Flatlander Oldtimer Offline Posts: 637 Location: Warm Arizona Joined: Apr 24^th, 2004	9-40 Tang Screws Jun 20^th, 2025 at 2:52pm	Print Post
	Any idea where I could pick up a pair of 9-40 tang sights screws for an old Marlin project I have. Everyone has 8-40 currently but they are too loose in hole and I'm afraid they will strip out when tightened. I am stumped. Thanks. Flatlander
	« Last Edit: Jun 20^th, 2025 at 2:58pm by Flatlander »
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KFW Oldtimer Offline Posts: 584 Location: Powell Wy. Joined: Dec 18^th, 2016	Re: 9-40 Tang Screws Reply #1 - Jun 20^th, 2025 at 6:49pm	Print Post
	With out looking up the actual #9 screw diameter, you could try a 8-40 split die and open it up. Go to far and it will crack though. Assuming you have a screw blank. Option 2 is turn/thread on a lathe.


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830singleshot Senior Forum Member Offline Posts: 437 Location: Texas Joined: Feb 11^th, 2007	Re: 9-40 Tang Screws Reply #2 - Jun 20^th, 2025 at 7:30pm	Print Post
	I ran into this problem when mounting one of Steve Baldwin's sights on a early Marlin 39. Steve stent me a set. Give him a call.

	J. Scott McCash&&New Braunfels, TX&&830-237-2376&&jsmccash@yahoo.com
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Packet Full Member Offline Posts: 113 Location: Port Orange, FL Joined: Jul 18^th, 2019	Re: 9-40 Tang Screws Reply #3 - Jun 20^th, 2025 at 7:31pm	Print Post
	Now you got me stumped. I have never heard of a #9 screw except for wood. I searched and found no info for a #9-40 screw.


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John Taylor Frequent Elocutionist Offline Posts: 1773 Location: Lewiston, ID Joined: Oct 23^rd, 2006	Re: 9-40 Tang Screws Reply #4 - Jun 20^th, 2025 at 9:47pm	Print Post
	Machinery's Handbook #25 does not have a listing for #9 screw. The #8 is .164" diameter and #10 is .190". Several gun manufactures used odd sizes just so people could not get parts from the hardware store. I run in to this sometimes and end up making custom screws. Winchester used a #10-35.5 on some of their guns, a 10-36 will usually work. I have seen a few peep sight inserts with 7/32-40.

	John Taylor Machinist/gunsmith
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Flatlander Oldtimer Offline Posts: 637 Location: Warm Arizona Joined: Apr 24^th, 2004	Re: 9-40 Tang Screws Reply #5 - Jun 20^th, 2025 at 10:25pm	Print Post
	830singleshot wrote on Jun 20^th, 2025 at 7:30pm: I ran into this problem when mounting one of Steve Baldwin's sights on a early Marlin 39. Steve stent me a set. Give him a call. I cannot find any contact information. It seems he shut down his operation.I may have to find someone else willing to spin me up a couple. Ideas? Flatlander

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KensBullard Participating Member Offline Posts: 33 Location: Woodland Wa Joined: Dec 17^th, 2024	Re: 9-40 Tang Screws Reply #6 - Jun 20^th, 2025 at 10:49pm	Print Post
	I have some for the Ballard and 1881 they are for the Ballard sights ken


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bobw Frequent Elocutionist Offline Posts: 1781 Location: NW, Iowa Joined: Mar 19^th, 2013	Re: 9-40 Tang Screws Reply #7 - Jun 20^th, 2025 at 10:50pm	Print Post
	Reply # 3 gets you close if you can make it. (You need to *Login* or *Register* to view media files and links) Bob

	Robert Warren
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AJ Full Member Offline Posts: 168 Joined: Aug 25^th, 2011	Re: 9-40 Tang Screws Reply #8 - Jun 21^st, 2025 at 2:10am	Print Post
	Flatlander, bolts/screws come in different tolerances. Are your 8-40’s from a good source?


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curdog Junior Member Offline Posts: 86 Joined: Feb 26^th, 2022	Re: 9-40 Tang Screws Reply #9 - Jun 21^st, 2025 at 6:44am	Print Post
	Try one of the M4.5 threads - I don't remember off the top of my head which pitch, but that's worked for me on occasion.


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Dellet Frequent Elocutionist Offline Posts: 1140 Joined: May 19^th, 2017	Re: 9-40 Tang Screws Reply #10 - Jun 21^st, 2025 at 7:03am	Print Post
	A #9 machine screw should be 11/64 diameter (You need to *Login* or *Register* to view media files and links) 11/64-40 seems to be a fairly common thread in Julie sewing machines, length and head style may be an issue, but it’s a start. (You need to *Login* or *Register* to view media files and links)


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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 16856 Location: Oregon Joined: Feb 2^nd, 2009	Re: 9-40 Tang Screws Reply #11 - Jun 21^st, 2025 at 9:36am	Print Post
	KensBullard wrote on Jun 20^th, 2025 at 10:49pm: I have some for the Ballard and 1881 they are for the Ballard sights ken Just buy them from Ken, and they'll be perfect for a Marlin Ballard or other early Marlin repeaters.

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Flatlander Oldtimer Offline Posts: 637 Location: Warm Arizona Joined: Apr 24^th, 2004	Re: 9-40 Tang Screws Reply #12 - Jun 21^st, 2025 at 11:01am	Print Post
	PM sent to Ken. Thanks for all replies. Flatlander
	« Last Edit: Jun 21^st, 2025 at 11:08am by Flatlander »
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wesg Senior Forum Member Offline Posts: 318 Joined: Sep 13^th, 2004	Re: 9-40 Tang Screws Reply #13 - Jun 21^st, 2025 at 9:35pm	Print Post
	Number drill sizes, '0' being .060". Each increment being .013. #8, .104 + .06 = .164 ... #10, .130 + .06 = .190. A #9 ... .177 ... 9/64 = .172 ... Never seen a 9 ... but heard stories of much larger and smaller. Whoops... correction.. A '00' being .047" ... '000' .034. Old Timer (likely younger then I am now) told me a story of chasing one or the other of those. 'You think an 0-80 is bad ...'
	« Last Edit: Jun 24^th, 2025 at 9:24am by wesg »

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