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1031378 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The SCOPE OVERLAY is a the manufacturer industrial component. Key specifications include general_characteristics_item_description: CIRCUIT FILTER 1,HANDLE 1,4.310IN. LG,3.520 IN.

W IN. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-309-2375, 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
1031378
NSN: 5340-00-309-2375
FSC: 5340
CAGE: 75535 — THE CROSBY GROUP LLC DBA THE CROSBY GROUP (USA)
SPECIFICATIONS
general_characteristics_item_descriptionCIRCUIT FILTER 1,HANDLE 1,4.310IN. LG,3.520 IN. W IN
NSN5340-00-309-2375
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1031378 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
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC) BODY
•
LENGTH: 15.000 INCHES NOMINAL IN
•
EYE WIDTH: 0.875 INCHES NOMINAL IN
•
SURFACE TREATMENT: ZINC OVERALL
•
END STYLE: CLOSED EYE AND CLOSED EYE
•
MATERIAL: STEEL COMP 1035 OVERALL
•
BODY STYLE: HEX OPEN BODY
•
NOMINAL THREAD SIZE: 0.625 INCHES BODY IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) BODY
LENGTH15.000 INCHES NOMINAL IN
EYE WIDTH0.875 INCHES NOMINAL IN
SURFACE TREATMENTZINC OVERALL
END STYLECLOSED EYE AND CLOSED EYE
MATERIALSTEEL COMP 1035 OVERALL
BODY STYLEHEX OPEN BODY
NOMINAL THREAD SIZE0.625 INCHES BODY IN
THREAD CLASS1B BODY
NONDEFINITIVE SPEC/STD DATA1 TEMPER AND 1 FORM AND 4 CLASS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
ASTM F 1145-5Upgraded Successor
successor cross-reference
successor
FF-T-791Upgraded Successor
successor cross-reference
successor
11157-1-64Upgraded Successor
successor cross-reference
successor
ASTM-F1145-I1B 1/2X9Upgraded Successor
successor cross-reference
successor
S-2510-1/2X9Upgraded Successor
successor cross-reference
successor
MS27954-5Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1031378?
1031378 is a SCOPE OVERLAY.
What parts can replace 1031378?
There are 18 known substitutes for 1031378: ASTM F 1145-5, FF-T-791, 11157-1-64 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1031378?
1031378 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-309-2375. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026