Mil-Spec Precision Dowel Pins — MS16555, MS16556 and Mil-P-21143 (M21143) — In Alloy Steel, and 18-8/300, & 416/400 Series Stainless Steel

Looking for Domestic Mil-P-21143, MS16555 or MS16556 Precision Dowel Pins in Alloy Steel, 18-8/300, or 416/400 Series Stainless Steel?

Mil-Spec (Military specification) precision dowel pins, also called ms dowel pins, are manufactured in the USA to meet the stringent quality standards required for defense and aerospace applications. These dowel pins are available in MS16555 for secure interference/press-fit applications and MS16556 for undersize/slip-fit assemblies. Additionally, MIL-P-21143 (M21143) precision dowel pins are available in both slip-fit and press-fit styles.

Mil Spec precision dowel pins are typically manufactured from hardened alloy steel with a plain finish (for spec sizes MS16555-1 through MS16555-145), alloy steel with a phosphate finish (for MS16555-301 through MS16555-444), or corrosion-resistant stainless steel grades such as 303 stainless steel (for M21143 series), and 416/400 series stainless steel (for MS16555-601 through MS16555-744). Available in diameter sizes ranging from 1/32 inch (0.03125 inches) to 1 inch, Mil-Spec dowel pins ensure compliance, precision, secure fit, and durability in the most demanding applications. Additionally, these dowel pins come with DFARS certifications and full documentation upon request, making them an ideal choice for military, aerospace, and other high-precision industries that demand reliability and traceability.

At MF Supply, we offer alloy steel, and 303 & 416 series stainless steel Mil-Spec precision dowel pins — adhering to standard MS16555, MS16556, and MIL-P-21143 — in hardened, unhardened, interference/press-fit and undersize/slip-fit styles, including major brands and equivalents to Pic Design, WM Berg, Unicorp, Misumi, Holo-Krome and more. Our Mil-Spec products are DFAR compliant with COC and full certifications available upon request.

Stock sizes include 1/32 inch to 1 inch diameters in hardened and unhardened 303 & 416/400 series stainless steel, and in alloy steel with plain or phosphate finish. Special materials and nonstandard sizes may be available for special orders with a lead time.

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