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Worldwide distributor of NSN parts and consumables located in the USA.

Piston Ring

Model / MPN: 859989-18 | NSN: 2805-00-395-1386
ITAR Registered seal

A circular, single or multipiece 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.

Product Details
NATO Stock Number
2805-00-395-1386
Sold in multiples of
1 EA
DEMIL
DEMIL/MLI
Cross Sectional Shape
Plain rectangular, straight face
Ring Style
Concentric
Radial Wall Thickness
Between 0.1510 inches and 0.1610 inches
Overall Width
Between 0.0440 inches and 0.0450 inches
Standard Bore Diameter
3.900 inches
Joint Style
Vertical joint
Material
Stainless steel
Material Specification
Mil-s-25043 cond 17-7ph military specification single material response
Fsc Application Data
Valve, shutoff-flow control, bleed air, environmentalcontrol system, acft
Solicitations
Solicitation Description Qty UOM Close Date
SPE7L217T2174 Ring, Piston 102 EA 03/17/2017
SPE7L218T0192 Ring, Piston 118 EA 10/30/2017
SPE7L218T1580 Ring, Piston 125 EA 02/26/2018
SPE7L518T2600 Ring, Piston 286 EA 06/11/2018
SPE7L518U0083 Ring, Piston 286 EA 08/03/2018

Pricing and Availability

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859989-18 Cross Reference
  • 859989-18