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8691A121 — PLUNGER,SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

8691A121: PLUNGER,SPRING.

The PLUNGER,SPRING is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING, overall_length: 1.630 INCHES NOMINAL IN, overall_diameter: 0.250 INCHES NOMINAL IN, special_features: PLUNGER INCLUDES A HANDLE AT 0.625 INCHES LONG. IN, end_item_identification: BOAT, RIVERINE ASSAULT, 33 FEET FT, thread_size_and_series/type_designator: 0 UNIFIED NATIONAL COARSE (UNC).

This part is cataloged in the U.S. Government catalog under NSN 5340-01-567-2843, 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
8691A121
NSN: 5340-01-567-2843
FSC: 5340 — Hardware, Commercial
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
overall_length1.630 INCHES NOMINAL IN
overall_diameter0.250 INCHES NOMINAL IN
special_featuresPLUNGER INCLUDES A HANDLE AT 0.625 INCHES LONG. IN
end_item_identificationBOAT, RIVERINE ASSAULT, 33 FEET FT
thread_size_and_series/type_designator0 UNIFIED NATIONAL COARSE (UNC)
part_name_assigned_by_controlling_agencyHAND-RETRACTABLE SPRING PLUNGER
NSN5340-01-567-2843
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 8691A121 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
•
OVERALL DIAMETER: 0.250 INCHES NOMINAL IN
•
MATERIAL: STEEL CORROSION RESISTING
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0 UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.250 INCHES NOMINAL IN
OVERALL LENGTH1.630 INCHES NOMINAL IN
SPECIAL FEATURESPLUNGER INCLUDES A HANDLE AT 0.625 INCHES LONG. IN
PART NAME ASSIGNED BY CONTROLLING AGENCYHAND-RETRACTABLE SPRING PLUNGER
END ITEM IDENTIFICATIONBOAT, RIVERINE ASSAULT, 33 FEET FT
MATERIALSTEEL CORROSION RESISTING
THREAD SIZE AND SERIES/TYPE DESIGNATOR0 UNIFIED 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 8691A121?
8691A121 is a PLUNGER,SPRING.
What is the NSN for 8691A121?
8691A121 is cataloged in the U.S. Government catalog under NSN 5340-01-567-2843. 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.