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777.21.042 — PLUNGER,DETENT

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

777.21.042: PLUNGER,DETENT.

The PLUNGER,DETENT is a the manufacturer industrial component. Key specifications include length: 0.850 INCHES MINIMUM AND 0.860 INCHES MAXIMUM LOCATION NOT OTHERWISE SPECIFIED IN, diameter: 0.458 INCHES MINIMUM AND 0.460 INCHES MAXIMUM LOCATION NOT OTHERWISE SPECIFIED IN, material: STEEL OVERALL, part_name_assigned_by_controlling_agency: PLUNGER(BLOCK). This part is cataloged in the U.S.

Government catalog under NSN 5340-01-525-5556, 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
777.21.042
NSN: 5340-01-525-5556
FSC: 5340 — Hardware, Commercial
CAGE: A3QPJ
SPECIFICATIONS
length0.850 INCHES MINIMUM AND 0.860 INCHES MAXIMUM LOCATION NOT OTHERWISE SPECIFIED IN
diameter0.458 INCHES MINIMUM AND 0.460 INCHES MAXIMUM LOCATION NOT OTHERWISE SPECIFIED IN
materialSTEEL OVERALL
part_name_assigned_by_controlling_agencyPLUNGER(BLOCK)
NSN5340-01-525-5556
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 777.21.042 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
•
LENGTH: 0.850 INCHES MINIMUM AND 0.860 INCHES MAXIMUM LOCATION NOT OTHERWISE SPECIFIED IN
•
DIAMETER: 0.458 INCHES MINIMUM AND 0.460 INCHES MAXIMUM LOCATION NOT OTHERWISE SPECIFIED IN
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
LENGTH0.850 INCHES MINIMUM AND 0.860 INCHES MAXIMUM LOCATION NOT OTHERWISE SPECIFIED IN
DIAMETER0.458 INCHES MINIMUM AND 0.460 INCHES MAXIMUM LOCATION NOT OTHERWISE SPECIFIED IN
PART NAME ASSIGNED BY CONTROLLING AGENCYPLUNGER(BLOCK)
MATERIALSTEEL OVERALL
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 1
E1211155Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 777.21.042?
777.21.042 is a PLUNGER,DETENT.
What parts can replace 777.21.042?
There is 1 known substitute for 777.21.042: E1211155. Substitute compatibility should be verified for your specific system.
What is the NSN for 777.21.042?
777.21.042 is cataloged in the U.S. Government catalog under NSN 5340-01-525-5556. 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.