Military Standards Piston Ring, Bore Diameter 3.4375" NSN:2805-00-555-6093 P/N:MS13931-10

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Piston Ring

NSN: 2805-00-555-6093 | Model: MS13931-10
ITAR Registered seal

A circular, single or multiplier item, metallic or nonmetallic in composition, designed to be fitted in a circumferential groove in a piston and to spring outward against the cylinder wall to function as a seal or wiper. It is supplied in various cross-sectional shapes and is cut through at one point to allow for installation in the piston ring groove. It may include an expander. Excludes packing, preformed; retainer, oil seal; retainer, packing; ring, retaining; ring wiper; and seal ring, metal.

NSN Properties and Flags
NATO Stock Number
Yes - ITAR Controlled
Cross Sectional Shape
Convex face, double scraper, ventilated oil control
Ring Style
Radial Wall Thickness
Between 0.1430 inches and 0.1550 inches
Overall Width
Between 0.1545 inches and 0.1555 inches
Standard Bore Diameter
3.4375 inches
Joint Style
Vertical joint
Oil Passage Type And Quantity
1 groove outside periphery

Schedule B & Trade:
  • Schedule B: 8409918000 (NAICS 333618)

    Parts for spark-ignition internal combustion piston engines, Nisei

  • SITC: 71391

    Parts, n.E.S, suitable for use solely or principally with spark-ignition internal combustion piston engines

  • End Use: 21100

    Industrial engines

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