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12-172-3770 — CAP-PLUG,PROTECTIVE,DUST AND MOI

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

12-172-3770: CAP-PLUG,PROTECTIVE,DUST AND MOI.

CAP-PLUG,PROTECTIVE,DUST AND MOI. Key specifications include material: PLASTIC, open_end_inside_diameter: 1.150 INCHES MAXIMUM IN, closed_end_overall_diameter: 1.396 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-722-8176, 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
12-172-3770
NSN: 5340-00-722-8176
FSC: 5340 — Hardware, Commercial
CAGE: INTE9 — NATO STOCK NUMBER POTENTIAL INTERCHANGEABILITY LINK
SPECIFICATIONS
materialPLASTIC
open_end_inside_diameter1.150 INCHES MAXIMUM IN
closed_end_overall_diameter1.396 INCHES MAXIMUM IN
NSN5340-00-722-8176
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 12-172-3770 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
•
CLOSED END OVERALL DIAMETER: 1.396 INCHES MAXIMUM IN
•
OPEN END INSIDE DIAMETER: 1.150 INCHES MAXIMUM IN
•
MATERIAL: PLASTIC
TECHNICAL CHARACTERISTICS
CLOSED END OVERALL DIAMETER1.396 INCHES MAXIMUM IN
OPEN END INSIDE DIAMETER1.150 INCHES MAXIMUM IN
MATERIALPLASTIC
SUBSTITUTES & CROSS-REFERENCES 4
341103-2Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
025-0467-000Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
1855178Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
1786392-3Reference 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 12-172-3770?
12-172-3770 is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What parts can replace 12-172-3770?
There are 4 known substitutes for 12-172-3770: 341103-2, 025-0467-000, 1855178 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 12-172-3770?
12-172-3770 is cataloged in the U.S. Government catalog under NSN 5340-00-722-8176. 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.