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  #1  
Old 02-05-2008, 05:06 AM
Bob D. Bob D. is offline
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1911 Grip screw size?




Anyone know what the official size of the grip screws are? I did a quick measure and they came out at - 4mm thread body, 6mm length and a .50 pitch thread. I measured them with my calipers and got - .255 L x .145 O.D. thread body. (Not exactly 4 & 6 mm.)

Are they actually metric, (which strikes me as a bit odd) or some other standard that I'm not familiar with?
A trivial subject I know, but any info on them is impossible to find.
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Old 02-05-2008, 12:56 PM
partsproduction partsproduction is offline
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They are not metric. The original specification is ".150"-50 NS-2". The exceptions are the Chinese built guns, from what I read, and possibly Filipino built guns?
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Old 02-05-2008, 01:16 PM
pvt. snafu pvt. snafu is offline
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Old 02-05-2008, 04:17 PM
Jim V Jim V is offline
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Grip screw threads for Norincos are the same as listed above. The grip screw bushings' exterior threads are metric however.
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Old 02-06-2008, 12:08 AM
Bob D. Bob D. is offline
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Wow, tis not your average screw, no wonder they're $o hard to find. Thanks.
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  #6  
Old 02-06-2008, 10:19 AM
partsproduction partsproduction is offline
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beware ebay screws, I bought 12 of them in SS with slotted heads and sent 7 back, they were not machined in the head area.
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  #7  
Old 02-06-2008, 03:29 PM
brickeyee brickeyee is offline
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Quote:
Originally Posted by Bob D. View Post
Wow, tis not your average screw, no wonder they're $o hard to find. Thanks.
In a large scale manufacturing setting there is not very much special about them.
#2 screws are normally 56 TPI, and while slightly harder to make than coarser threads they still get crancked out pretty easily.

Screw machines have been around a long time.
The price is driven more by volume than anything else.
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Old 02-07-2008, 04:16 AM
Bob D. Bob D. is offline
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Quote:
Originally Posted by brickeyee View Post
In a large scale manufacturing setting there is not very much special about them.
#2 screws are normally 56 TPI, and while slightly harder to make than coarser threads they still get crancked out pretty easily.

Screw machines have been around a long time.
The price is driven more by volume than anything else.
Right, you can buy a pack of # 00 eyeglass screws for .99c at the drug store.

With the help of the internet, including this forum, I compiled and simplified some basic info for the "grip screw challenged" types like myself that I believe is correct.

Grip screw type/designation:
0.150 - 50 UNS - 2A

Shaft diameter:
.150

Shaft length:
.255

Thread pitch:
50 threads per inch.

Head Diameter:
.275

Nomenclature:

"50 UNS" = 50 threads per inch, Unified National Special thread profile.

"2A" = The Class Fit, amount of tolerance or tolerance and allowance specified.

The UNS series is a catch-all category for threads which have the American Standard form, but whose pitches are not in the Unified National Coarse (UNC) or Unified National Fine (UNF) series.


Feel free to correct as needed.

Last edited by Bob D.; 02-07-2008 at 04:32 AM.
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  #9  
Old 02-07-2008, 10:32 AM
partsproduction partsproduction is offline
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And I would add that ordnance spec is for them to be case hardened to "file hardness", though I haven't seen the carburizing depth, it wouldn't be more than 3-5 thousandths I wouldn't think. Most of what comes on new 1911's is soft, either 12L14 or 416 stainless or perhaps 303. Ignorant buyers invite such adulteration by not demanding original specification parts or at least an explanation of why what they offer is better. The original screws should be very cheap to manufacture. 416 can be hardened to around 40RC I think, for stainless screws.
We don't make screws so I don't know what the problems are. People complain about hex sockets stripping, assuming one wanted hex socket screws they certainly could be hardened.
To be honest I haven't checked the hardness of the stainless screws on one of my guns, but I know for fact that wartime 1911 screws were file hard at the surface.
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  #10  
Old 02-08-2008, 02:23 PM
TGC TGC is offline
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Screws

Try a canadian sight called marstar, they have both metric and non metric screws
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