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Technical Data Sheet
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25-721 — TRANSFORMER,POWER

✓ Government record, cited
Clementoni · ORING SEAL
PRODUCT OVERVIEW

25-721: TRANSFORMER,POWER.

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This part is cataloged in the U.S. Government catalog under NSN 5331-00-181-4787, indicating validated use in U.S. government and defense logistics supply chains.

WHERE IT FITS
25-721
NSN: 5331-00-181-4787
NIINs: 001814787, 003503033, 006760848, 010400511
FSC: 5331 — O-ring
CAGE: 5S241 — SUPERIOR FABRICATION COMPANY, LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 1065 OVERALL
end_styleSPRING END,SQUARED AND GROUND BOTH ENDS
body_height2.470 INCHES MINIMUM AND 2.530 INCHES MAXIMUM IN
coil_quantity11
overall_width3.470 INCHES MINIMUM AND 3.530 INCHES MAXIMUM IN
inclosure_typeFULLY INCLOSED
overall_length8.590 INCHES MINIMUM AND 8.650 INCHES MAXIMUM IN
inside_diameter0.441 INCHES NOMINAL IN
mounting_methodTHREADED HOLE(S) SINGLE GROUP
frequency_rating400.0 HERTZ NOMINAL SINGLE COMPONENT
style_designatorCYLINDRICAL
spring_free_length1.875 INCHES NOMINAL IN
NSN5331-00-181-4787
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 25-721 MFR: Clementoni ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
SUBSTITUTES & CROSS-REFERENCES 1
182MMD1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 25-721?
25-721 is a TRANSFORMER,POWER manufactured by Clementoni.
What parts can replace 25-721?
There is 1 known substitute for 25-721: 182MMD1. Substitute compatibility should be verified for your specific system.
What is the NSN for 25-721?
25-721 is cataloged in the U.S. Government catalog under NSN 5331-00-181-4787. 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.