M14 Forum

Topkick

Howdy men, can anyone tell me the maker of my bolt (code-7790186 66119 TT). A USGI bolt installed in my Polytech M14S?. Thanks,I appreciate your help.

Topkick

JD Russell

That's a Winchester bolt

Topkick

Thanks a bunch JD, I preciate it!!!.

M1A Craig

Can somebody ID my bolt? Just bought a used SAI M1A #103*** born on July 1997. It has a TRW OP rod and other USGI parts, but the only stamping on the bolt is a tiny "M1". Absolutely nothing else! On the bottom it has a type of stamped "M", not the normal hand etched "M" I see on others to denote magnetic particle testing. The M is funky though, made with what looks like two stamps from a "7" to make it look like an "M".

Edited to say PICS are on the 2nd page of this thread.

Thanks,

Craig

TnVols27

Hi, I just purchased a M1A standard made in Sept of 89. Could some one please tell me if my bolt is USGI or not the serial no. is 7790186 6618-00 thanks

Different

Call Customer Service at www.springfield-armory.com You may have a recall bolt. No joke.

Different

The bolt is USGI Winchester. The CAGE Code for Winchester was 66118.

MikeW

Welcome to M14FL BTW

M1A Craig

Thanks for the reply Different!

I called SAI and sent clear pictures via email. The customer service woman had a tech look at them. This is their response:Is there a way I can post the pics to see If anyone can ID it? As long as it is a "good forged bolt" I guess I am GTG - I am just hoping it is not a cheap import. I have held off my feedback on Gunbroker until I can determine if the original bolt has been swapped out. One would think SAI would know their own bolts of that era......

BTW I put a 308 Clymer No-Go gauge in it, with the extractor and ejector removed. (I could not find a 7.62X51 gauge - does it matter?) Prior to doing the bolt roller impingement mod, the bolt would not close on the gauge with finger pressure. If I hooked the op-rod on and gently let the spring pressure pull, it would cam over. After the impingement mod, the bolt will not cam over with op-rod spring pressure.


Thanks,

Craig

tjh121

With your low "post count" the best way would be to post them to a site like "Photo Bucket", and then include a link to that Photo Bucket location (or a similar site- doesn't have to be P.B.)

M1A Craig

Thanks tjh - Here we go!






Don't know why I didn't think of it before, but the stamp on the backside looks more like a "W" than any kind of an "M" when viewed the other way. Still looks like two individual stamps instead of one to me though, but I could be wrong.

First time for PhotoBucket. Not used to this low post thing on my motorcycle forum. Thanks again!

Craig

Daimyo

Bolt Markings - A USGI bolt (and receiver) may or may not have a dimple from a pin punch after successful proof round testing. Replacement bolts were proof round tested using a fixture. Frankford Arsenal and Lake City loaded the proof rounds to 65,000 psi. An inscribed letter M on a USGI bolt means it was examined by magnetic particle inspection. Not all USGI bolts will have the letter M though. USGI M14 bolts have additional stamps besides the part number and bolt manufacturer. The other markings are heat treatment and steel lot numbers. Such an example can be found on a bolt marked 7790186 HRT A20 CDR. These are in order: 1) part number 2) manufacturer code 3) material lot number and 4) steel supplier code. If a manufacturer had only one steel supplier then just the heat treating lot was stamped on the bolt. Other manufacturers consolidated their markings to include both material lot and steel maker. All M14 type rifles properly assembled will have bolts with rollers attached.

The U. S. government Springfield Armory bolt markings can be confused with commercial reproduction Springfield Armory, Inc. bolts. The U. S. government Springfield Armory stamped its bolts in one of two ways, one format for 7790185 bolts and another format for 7790186 bolts. If the bolt was made by the U. S. government Springfield Armory and it is marked 7790185 it will have the following: 7790185-SA on the first line and the material lot number on the second line, e.g., YO2. U. S. government Springfield Armory bolts made to the 7790186 drawing have this identification scheme: 7790186 on the first line followed and then SA and the material lot number on the second line, e.g., Z1B. USGI M14 bolts made by Winchester have its CAGE Code, 66118, on the second line whether stamped 7790185 or 7790186 on the first line. Textile Machine Works M14 bolts can have the manufacturer code, HRT, either on the first line or the second line of the bolt markings.

There are bolts with counterfeit markings. Ron Smith of Smith Enterprise, Inc. has seen two M14 bolts stamped TRW that were not made by TRW. Most genuine unaltered commercial Springfield Armory, Inc. M1A bolts do not have a pin punch dimple. The M1A bolts marked 7790185 on the top line and SA RRR on the bottom line are an exception to this rule of thumb. All USGI bolts were phosphate coated. Any M14 bolt that is bare steel or has a finish other than phosphate coating was not produced that way by the USGI contractor so buyer beware! The bolt installed in the M14 type rifle should be able to pass the slide test as discussed in Kuhnhausen’s manual and have proper lug engagement and proper headspace prior to use.

and

Bolt - Springfield Armory, Inc. M1A bolts are manufactured in the United States of America. The M1A bolts are typically marked 7790186-SA on the first line and A00030, B00048 or F00059 or similar number on the second line. They may have markings such as D and M3 on the rear end and A9 or B1 on the bottom surface. The letter A prefix for the number under 7790186-SA means the bolt was cast then finish machined. The letter B prefix for the number under 7790186-SA means the bolt was machined from bar stock. The letter F prefix for the number under 7790186-SA means the bolt is forged. Springfield Armory, Inc. began installing F prefix M1A bolts by no later than 2000.

See 1987 Springfield Armory, Inc. Recall Notice for additional M1A bolt markings. No M1A parts, including bolts, are made by metal injection molding. Around receiver serial number 165***, Springfield Armory, Inc. commercial manufacture factory installed bolts have letters and numerals with a taller and thinner font than the style found on USGI M14 bolts. A Springfield Armory, Inc. M1A bolt not subject to recall was tested for surface hardness. The result was 52 HRC, the same as a USGI HRT marked M14 bolt.

Hope this helps
Paulie

M1A Craig

Thanks Paulie,

I have read most of that before. It is helpful in that my bolt does not fit ANY of those categories! From the recall notice:My bolt may be fall under #2 above, but SAI should have recognized it from the pictures I sent - the same ones posted here. As this rifle, #103***, left the factory in July 1997, it should not have been subject to a 1987 recall - if it is the original bolt. Still hoping someone can identify it. Maybe I will email SAI again and specifically ask about the recall.

Thanks,

Craig

pepsi71ocean

F00197-Thanks for the info, i feel safer knowing that my bolt was forged. PLUS, it helps solve the riddle of what the bolt numbers stamped on the bolt were all about.

remington79

I wonder who made the bolt on my Armscorp fo America? The bottom line is very similar to the Winchester markings but I'm not sure. The top line is 7790186. The bottom line is 6618-KK.