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S838-21 — RING,PISTON

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

S838-21: RING,PISTON.

The RING,PISTON is a the manufacturer industrial component. Key specifications include material: IRON OVERALL, ring_style: CONCENTRIC, overall_width: 0.2500 INCHES NOMINAL IN, fsc_application_data: TURBINE,STEAM, radial_wall_thickness: 0.2500 INCHES NOMINAL IN, standard_bore_diameter: 8.000 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 2825-00-752-9893, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
S838-21
NSN: 2825-00-752-9893
FSC: 2825 — Steam Turbines and Components
CAGE: 93591 — PENTAIR VALVES & CONTROLS US LP DIV FLOW CONTROL US HOLDING CORP (USA)
SPECIFICATIONS
materialIRON OVERALL
ring_styleCONCENTRIC
overall_width0.2500 INCHES NOMINAL IN
fsc_application_dataTURBINE,STEAM
radial_wall_thickness0.2500 INCHES NOMINAL IN
standard_bore_diameter8.000 INCHES IN
cross-sectional_shape_stylePLAIN RECTANGULAR, STRAIGHT FACE
NSN2825-00-752-9893
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RING,PISTON TITLE COMPONENT PN S838-21 MFR RING,PISTON
KEY FEATURES
•
FSC APPLICATION DATA: TURBINE,STEAM
•
CROSS-SECTIONAL SHAPE STYLE: PLAIN RECTANGULAR, STRAIGHT FACE
•
RADIAL WALL THICKNESS: 0.2500 INCHES NOMINAL IN
•
RING STYLE: CONCENTRIC
•
STANDARD BORE DIAMETER: 8.000 INCHES IN
•
MATERIAL: IRON OVERALL
TECHNICAL CHARACTERISTICS
FSC APPLICATION DATATURBINE,STEAM
OVERALL WIDTH0.2500 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLEPLAIN RECTANGULAR, STRAIGHT FACE
RADIAL WALL THICKNESS0.2500 INCHES NOMINAL IN
RING STYLECONCENTRIC
STANDARD BORE DIAMETER8.000 INCHES IN
MATERIALIRON OVERALL
OTHER ITEMS IN FSC 2825 — Steam Turbines and Components
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
2825-00-001-8044 2825-00-036-3377 2825-00-146-0122 2825-00-373-0694 2825-00-388-6912
SUBSTITUTES & CROSS-REFERENCES 7
NP417PC21Reference document
Same NSN cross-reference
Reference document — Secondary reference
S788PC21Reference document
Same NSN cross-reference
Reference document — Secondary reference
NK1247-1Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
NK1247Reference document
Same NSN cross-reference
Reference document — Secondary reference
S-1133 PICEC 30Reference document
Same NSN cross-reference
Reference document — Secondary reference
S628PC21Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is S838-21?
S838-21 is a RING,PISTON.
What parts can replace S838-21?
There are 7 known substitutes for S838-21: NP417PC21, S788PC21, NK1247-1 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S838-21?
S838-21 is cataloged in the U.S. Government catalog under NSN 2825-00-752-9893. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.