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Tells you, that you have a single or a double heat treated bolt.
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Because they were marked during production while in place in a machine fixture.Why does it always appear in the exact same location and orientation?
My SWAG,
EmriComment
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Perhaps the raw billets were stamped by the supplier that provided them. I am not familiar with the actual production process but do know the numbers represented the company that supplied it and a lot number that represented the make up of the steel.
KurtAs the late Turner Kirkland was fond of saying, "If you want good oats, you have to pay the price. If you'll take oats that have already been through the horse, those come cheaper."Comment
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Change to DHT method with a couple exceptions in 1918.As the late Turner Kirkland was fond of saying, "If you want good oats, you have to pay the price. If you'll take oats that have already been through the horse, those come cheaper."Comment
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As the late Turner Kirkland was fond of saying, "If you want good oats, you have to pay the price. If you'll take oats that have already been through the horse, those come cheaper."Comment
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All C 8 bolts observed to date had straight handles and the steel lot code was stamped beneath the safety lug. The first J 5 bolts also had straight handles and the steel lot code was stamped beneath the safety lug. These were succeeded by curved-handle J 5 bolts with the steel lot code stamped beneath the safety lug. Production of curved-handle J 5 bolts ended in mid-1919.
Springfield resumed production of J 5 bolts in 1926. These also had curved handles, but the steel lot code was stamped atop the handle.
All C 8 and J 5 bolts are believed to be DHT, but no guarantees can be made. The steel lot code refers exclusively to the raw steel from the steel mill and is no conclusive indication of final heat treatment.
Hope this helps.
J.B.Comment
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John, very helpful and clears up an area I was curious about.
Regards
KurtAs the late Turner Kirkland was fond of saying, "If you want good oats, you have to pay the price. If you'll take oats that have already been through the horse, those come cheaper."Comment
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For those following the "hidden message" pursuit, Emri solved the initial riddle.
Springfield Armory used a fixture for stamping the steel lot code. So the codes were always stamped in the same sequence and same location. See my preceding post to get the proper method for holding the bolt and reading the code.
And the second "hidden message" was simpler. When the steel lot code location changed, that meant Springfield implemented a fixturing change. One day they were stamping codes beneath the safety lug. The next day they were stamping codes atop the bolt handle using a new fixture. The change was abrupt. There was no transition or overlap.
These discoveries came in very handy when trying to unravel and date all the bolt steel lot codes.
J.B.Last edited by John Beard; 01-20-2014, 01:35.Comment
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Very interesting and always welcome tidbits. Did the switch to swept handles coincide with the change in lot code location or was it just happenstance for lack of a better word.
Much appreciated lesson.
KurtAs the late Turner Kirkland was fond of saying, "If you want good oats, you have to pay the price. If you'll take oats that have already been through the horse, those come cheaper."Comment
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