Alloy Steel 4140 Dowel Pins
Chromoly alloy steel — high strength and toughness.
4140 is a chromium-molybdenum alloy steel chosen for strength and toughness rather than corrosion resistance. As a dowel pin it suits tooling, fixtures and machinery where the pin carries real shear load in a dry, benign environment. It will rust without a coating or oil, so it is a poor choice anywhere near moisture, and it is magnetic, which rules it out of some instrument work.
4140 pins belong in tooling and machinery — press tools, fixtures, and mechanisms where the pin is a load path and the environment is dry. Anywhere with wash-down or humidity, an uncoated 4140 pin will corrode, and a stainless pin avoids the coating step altogether.
Any size, not a series
There is no size list here because there is no catalogue: diameters run from 0.015" to 0.375", including sizes between two standard ones, and lengths from 0.02" to 4" — turned to order rather than cut down from a stock pin and re-finished. Pricing in Alloy Steel 4140 starts at $3.12 per piece at 100 off, and falls further at higher volumes.
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