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A31009 — BOOT,DUST AND MOISTURE SEAL

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

A31009: BOOT,DUST AND MOISTURE SEAL.

The BOOT,DUST AND MOISTURE SEAL is a the manufacturer industrial component. Key specifications include material: RUBBER SILICONE BODY, base_width: 1.890 INCHES NOMINAL IN, body_height: 3.875 INCHES NOMINAL IN, overall_height: 4.016 INCHES NOMINAL IN, mounting_method: UNTHREADED HOLE(S), style_designator: THRU-HOLE. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-531-0749, 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
A31009
NSN: 5340-00-531-0749
FSC: 5340 — Hardware, Commercial
CAGE: 53397 — NUMAX ELECTRONICS INC (USA)
SPECIFICATIONS
materialRUBBER SILICONE BODY
base_width1.890 INCHES NOMINAL IN
body_height3.875 INCHES NOMINAL IN
overall_height4.016 INCHES NOMINAL IN
mounting_methodUNTHREADED HOLE(S)
style_designatorTHRU-HOLE
material_thickness0.078 INCHES NOMINAL IN
base_overall_length4.328 INCHES NOMINAL IN
fsc_application_dataMOUNT MACHINE GUN,TRAILER MOUNTED
body_outside_diameter3.390 INCHES NOMINAL IN
mounting_hole_diameter0.234 INCHES NOMINAL IN
opening_inside_diameter0.797 INCHES NOMINAL IN
NSN5340-00-531-0749
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A31009 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
•
FSC APPLICATION DATA: MOUNT MACHINE GUN,TRAILER MOUNTED
•
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO LENGTH: 3.937 INCHES NOMINAL IN
•
OPENING INSIDE DIAMETER: 0.797 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 3.390 INCHES NOMINAL IN
•
MOUNTING METHOD: UNTHREADED HOLE(S)
•
BODY HEIGHT: 3.875 INCHES NOMINAL IN
•
STYLE DESIGNATOR: THRU-HOLE
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT4.016 INCHES NOMINAL IN
FSC APPLICATION DATAMOUNT MACHINE GUN,TRAILER MOUNTED
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO LENGTH3.937 INCHES NOMINAL IN
OPENING INSIDE DIAMETER0.797 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER3.390 INCHES NOMINAL IN
MOUNTING METHODUNTHREADED HOLE(S)
BODY HEIGHT3.875 INCHES NOMINAL IN
STYLE DESIGNATORTHRU-HOLE
MOUNTING HOLE DIAMETER0.234 INCHES NOMINAL IN
BASE OVERALL LENGTH4.328 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
5310749Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Demilitarization required — mutilation
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FREQUENTLY ASKED QUESTIONS
What is A31009?
A31009 is a BOOT,DUST AND MOISTURE SEAL.
What parts can replace A31009?
There is 1 known substitute for A31009: 5310749. Substitute compatibility should be verified for your specific system.
What is the NSN for A31009?
A31009 is cataloged in the U.S. Government catalog under NSN 5340-00-531-0749. 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.