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MIL-P-20691 — PLUG,EXPANSION

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

MIL-P-20691: PLUG,EXPANSION.

The PLUG,EXPANSION is a the manufacturer industrial component. Key specifications include radius: 0.219 INCHES NOMINAL IN, material: STEEL, outside_diameter: 0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN, style_designator: CONCAVE, material_thickness: 0.027 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN, material_document_and_classification: 66, COMP 1008 THRU 1022 FED STD SINGLE MATERIAL RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-050-1589, 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
MIL-P-20691
NSN: 5340-00-050-1589
NIINs: 000501589, 000541404, 000541408, 000541410, 001970385, 002325723, 004318854, 005597543, 010541817
FSC: 5340 — Hardware, Commercial
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
radius0.219 INCHES NOMINAL IN
materialSTEEL
outside_diameter0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN
style_designatorCONCAVE
material_thickness0.027 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN
material_document_and_classification66, COMP 1008 THRU 1022 FED STD SINGLE MATERIAL RESPONSE
NSN5340-00-050-1589
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-P-20691 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: 0.531 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 0.498 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: CONCAVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OR AISI C1008 THRU C1022 ASSN STD SINGLE MATERIAL RESPONSE OR SAE 1008 THRU 1022 ASSN STD SINGLE MATERIAL RESPONSE
•
MATERIAL THICKNESS: 0.065 INCHES NOMINAL IN
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
RADIUS0.531 INCHES NOMINAL IN
OUTSIDE DIAMETER0.498 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
STYLE DESIGNATORCONCAVE
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OR AISI C1008 THRU C1022 ASSN STD SINGLE MATERIAL RESPONSE OR SAE 1008 THRU 1022 ASSN STD SINGLE MATERIAL RESPONSE
MATERIAL THICKNESS0.065 INCHES NOMINAL IN
END ITEM IDENTIFICATIONSHOP EQUIPMENT, CONTACT MAINTENANCE, TRUCK MOUNTED,FIRE PUMPS,SAFEGUARD CLASS ARS,FORRESTAL CLASS CV,SUPPORT EQUIPMENT, B-1 AIRCRAFT,TRUCK, CARGO, 5-TON, 6X6, XLWB W/E,WASP CLASS LHD,AIRBORNE MOBILE DIR AIR SPT CTL (2ID),(02M JUL83)(AN/UYQ-3A),TARAWA CLASS LHA A
MATERIALSTEEL
SUBSTITUTES & CROSS-REFERENCES 8
1948694Reference document
Same NSN cross-reference
Reference document — Secondary reference
0910333-4Reference document
Same NSN cross-reference
Reference document — Secondary reference
910333Reference document
Same NSN cross-reference
Reference document — Secondary reference
541428Reference document
Same NSN cross-reference
Reference document — Secondary reference
71191Reference document
Same NSN cross-reference
Reference document — Secondary reference
0910333Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MIL-P-20691?
MIL-P-20691 is a PLUG,EXPANSION.
What parts can replace MIL-P-20691?
There are 8 known substitutes for MIL-P-20691: 1948694, 0910333-4, 910333 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-P-20691?
MIL-P-20691 is cataloged in the U.S. Government catalog under NSN 5340-00-050-1589. This indicates validated use in U.S. government and defense supply chains.
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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.