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3408A31 — PLUNGER,QUICK RELEASE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

3408A31: PLUNGER,QUICK RELEASE.

The PLUNGER,QUICK RELEASE is a the manufacturer industrial component. Key specifications include shape: OVAL, material: STEEL BODY, overall_length: 0.75 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, nominal_thread_size: 0.50 INCHES IN, end_item_identification: 3810-01-607-9674. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-677-7556, 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
3408A31
NSN: 5340-01-677-7556
FSC: 5340 — Hardware, Commercial
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
shapeOVAL
materialSTEEL BODY
overall_length0.75 INCHES NOMINAL IN
thread_directionRIGHT-HAND
nominal_thread_size0.50 INCHES IN
end_item_identification3810-01-607-9674
thread_quantity_per_inch13
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
part_name_assigned_by_controlling_agencyBALL-NOSE SPRING PLUNGER
NSN5340-01-677-7556
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3408A31 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
•
SHAPE: OVAL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.50 INCHES IN
•
THREAD QUANTITY PER INCH: 13
•
MATERIAL: STEEL BODY
TECHNICAL CHARACTERISTICS
SHAPEOVAL
OVERALL LENGTH0.75 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.50 INCHES IN
PART NAME ASSIGNED BY CONTROLLING AGENCYBALL-NOSE SPRING PLUNGER
END ITEM IDENTIFICATION3810-01-607-9674
THREAD QUANTITY PER INCH13
MATERIALSTEEL BODY
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3408A31?
3408A31 is a PLUNGER,QUICK RELEASE.
What is the NSN for 3408A31?
3408A31 is cataloged in the U.S. Government catalog under NSN 5340-01-677-7556. 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.