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SIZE7 ✓ 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

CAP-PLUG,PROTECTIVE,DUST AND MOI. Key specifications include color: BROWN OR NATURAL, material: LEATHER COVER, design_type: COMBINATION, special_features: LONGITUDINAL AND TRANSVERSE, length_under_shoulder: 0.500 INCHES NOMINAL IN, open_end_inside_diameter: 0.605 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-290-7221, 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
SIZE7
NSN: 5340-00-290-7221
FSC: 5340
CAGE: 95760 — PROTECTIVE CLOSURES CO INC (USA)
SPECIFICATIONS
colorBROWN OR NATURAL
materialLEATHER COVER
design_typeCOMBINATION
size_designation7
special_featuresLONGITUDINAL AND TRANSVERSE
length_under_shoulder0.500 INCHES NOMINAL IN
open_end_inside_diameter0.605 INCHES NOMINAL IN
closed_end_overall_diameter0.580 INCHES NOMINAL IN
part_name_assigned_by_controlling_agencySUPPORT ARCH COMB MALE SZ 7 D PLUS W WIDTH L R HEEL COMB SZ 7-M
NSN5340-00-290-7221
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: SIZE7 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: 0.580 INCHES NOMINAL IN
•
MATERIAL: PLASTIC
•
OPEN END INSIDE DIAMETER: 0.605 INCHES NOMINAL IN
•
LENGTH UNDER SHOULDER: 0.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CLOSED END OVERALL DIAMETER0.580 INCHES NOMINAL IN
MATERIALPLASTIC
OPEN END INSIDE DIAMETER0.605 INCHES NOMINAL IN
LENGTH UNDER SHOULDER0.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
7Upgraded Successor
successor cross-reference
successor
MILC52078Upgraded Successor
successor cross-reference
successor
RU51089Upgraded Successor
successor cross-reference
successor
28901-17Upgraded Successor
successor cross-reference
successor
21Upgraded Successor
successor cross-reference
successor
MIL-C-5501Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SIZE7?
SIZE7 is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What parts can replace SIZE7?
There are 26 known substitutes for SIZE7: 7, MILC52078, RU51089 and 23 more. Substitute compatibility should be verified for your specific system.
Is SIZE7 still available?
SIZE7 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026