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X981 — PLUG,EXPANSION

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

X981: PLUG,EXPANSION.

The PLUG,EXPANSION is a the manufacturer industrial component. Key specifications include length: 2.125 INCHES NOMINAL IN, radius: 0.406 INCHES NOMINAL IN, material: RUBBER, temp_rating: -67.0 FAHRENHEIT AND 158.0 FAHRENHEIT DEGF, shaft_length: 0.250 INCHES NOMINAL IN, figure_height: UNABLE TO DECODE. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-197-0385, 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
X981
NSN: 5340-00-197-0385
NIINs: 001970385, 005475959, 007296189
FSC: 5340 — Hardware, Commercial
CAGE: 77260 — PIERCE CO INC THE SUB OF AVIS INDUSTRIAL CORP (USA)
SPECIFICATIONS
length2.125 INCHES NOMINAL IN
radius0.406 INCHES NOMINAL IN
materialRUBBER
temp_rating-67.0 FAHRENHEIT AND 158.0 FAHRENHEIT DEGF
shaft_length0.250 INCHES NOMINAL IN
figure_heightUNABLE TO DECODE
overall_width1.310 INCHES NOMINAL IN
overall_height1.310 INCHES NOMINAL IN
overall_length1.420 INCHES NOMINAL IN
shaft_diameter0.1247 INCHES NOMINAL IN
outside_diameter0.372 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
special_features0. 250 IN. SHAFT ON LEFT SIDE IN
NSN5340-00-197-0385
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: X981 MFR: OEM ⚠ 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
KEY FEATURES
•
RADIUS: 0.406 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 0.372 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: CONCAVE
•
MATERIAL THICKNESS: 0.065 INCHES NOMINAL IN
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
RADIUS0.406 INCHES NOMINAL IN
OUTSIDE DIAMETER0.372 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
STYLE DESIGNATORCONCAVE
MATERIAL THICKNESS0.065 INCHES NOMINAL IN
MATERIALSTEEL
SUBSTITUTES & CROSS-REFERENCES 7
02531Reference document
Same NSN cross-reference
Reference document — Secondary reference
103889Reference document
Same NSN cross-reference
Reference document — Secondary reference
303SZ21Reference document
Same NSN cross-reference
Reference document — Secondary reference
50104Reference document
Same NSN cross-reference
Reference document — Secondary reference
172525Reference document
Same NSN cross-reference
Reference document — Secondary reference
MIL-P-20691Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is X981?
X981 is a PLUG,EXPANSION.
What parts can replace X981?
There are 7 known substitutes for X981: 02531, 103889, 303SZ21 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for X981?
X981 is cataloged in the U.S. Government catalog under NSN 5340-00-197-0385. 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.