1911 sear

1013 Views 4 Replies 4 Participants Last post by George Smith, Jul 31, 2001

Discussion Starter · Jul 29, 2001

I am probably not asking this question righr but here goes: I have some factory sears (colt and SA) that were replaced by my gunsmith and while going through my container of parts that were replaced in the past. I placed three factory colt sears on top of each other(I keep the parts labled and seperated) and noticed that they were different lengths.

The question I have is: Is there a correct length for a sear and what is it:

Pat

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fremont

· #2 · Jul 30, 2001

In order to save the time researching it myself, may I direct you to Kuhnhausen .45Auto Volume #2?

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gyp_c

· #3 · Jul 30, 2001

Yeah...would you post it after you find it? I don't have that volume either...Or anyone else?

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LenB

· #4 · Jul 30, 2001

Originally posted by PKRCKR:
I am probably not asking this question righr but here goes: I have some factory sears (colt and SA) that were replaced by my gunsmith and while going through my container of parts that were replaced in the past. I placed three factory colt sears on top of each other(I keep the parts labled and seperated) and noticed that they were different lengths.

The question I have is: Is there a correct length for a sear and what is it:

Pat

Looking at Page 162, Figure 153 of Kuhnhausen Vol. II - There's a dimensioned side view of the 1911 sear with tolerances, but it's hard to answer your question directly. The problem is that all dimensions are referenced from the center of the sear pin hole and the sear's shape is pretty complicated. Maybe a machinist could give a direct answer, but it's too much for me. One way you could compare the three sears is to stack them on a pin punch which is the same diameter as the sear pin. This will at least give you a better idea how they compare. The differences you see may be in areas that don't matter in terms of the standard shape and function.

[This message has been edited by LenB (edited 07-30-2001).]

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George Smith

· #5 · Jul 31, 2001

The text book answer is .404 from the center of the sear pin hole to the surface the hammer engagues. The pin idea is good, you have the sear pin there, outside the gun you can put 2 together and see how they line up?

take the .404 and subtract .0555 for half the sear pin. you can measure and see where you fall in?

interestin side note, when Les was starting out he used our sears for a wile and was complaining they were too long for the para.
so we checked and, well they wern't and worked fine in all the closer tolerance guns.

also wile your at it you do not mention ser 70 or 80? Most of the ser 80 sears are mim
the ser 70 machined. that may account for some of the difference??
geo ><>

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