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HC-260X2 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

HC-260X2: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL, design_type: SOLID, end_diameter: 1.3750 INCHES NOMINAL IN, bore_diameter: 0.8750 INCHES MINIMUM AND 0.8780 INCHES MAXIMUM IN, overall_height: 2.6130 INCHES NOMINAL IN, style_designator: SEAT. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-346-3262, 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
HC-260X2
NSN: 5340-00-346-3262
FSC: 5340 — Hardware, Commercial
CAGE: 16712 — SIEMENS ENERGY, INC. (USA)
SPECIFICATIONS
materialSTEEL
design_typeSOLID
end_diameter1.3750 INCHES NOMINAL IN
bore_diameter0.8750 INCHES MINIMUM AND 0.8780 INCHES MAXIMUM IN
overall_height2.6130 INCHES NOMINAL IN
style_designatorSEAT
first_step_length0.1880 INCHES NOMINAL IN
first_step_diameter1.6200 INCHES MINIMUM AND 1.6250 INCHES MAXIMUM IN
second_step_diameter2.1850 INCHES MINIMUM AND 2.1860 INCHES MAXIMUM IN
distance_from_end_to_first_step2.2500 INCHES NOMINAL IN
NSN5340-00-346-3262
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: HC-260X2 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
•
FIRST STEP DIAMETER: 1.6200 INCHES MINIMUM AND 1.6250 INCHES MAXIMUM IN
•
END DIAMETER: 1.3750 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 2.2500 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
•
STYLE DESIGNATOR: SEAT
•
SECOND STEP DIAMETER: 2.1850 INCHES MINIMUM AND 2.1860 INCHES MAXIMUM IN
•
FIRST STEP LENGTH: 0.1880 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT2.6130 INCHES NOMINAL IN
FIRST STEP DIAMETER1.6200 INCHES MINIMUM AND 1.6250 INCHES MAXIMUM IN
END DIAMETER1.3750 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP2.2500 INCHES NOMINAL IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
SECOND STEP DIAMETER2.1850 INCHES MINIMUM AND 2.1860 INCHES MAXIMUM IN
FIRST STEP LENGTH0.1880 INCHES NOMINAL IN
BORE DIAMETER0.8750 INCHES MINIMUM AND 0.8780 INCHES MAXIMUM IN
MATERIALSTEEL
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 5
G17188PC35Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
DD5610BPC5Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
G10147PC29Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
H1871PC35Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
AV7S55-214PC29Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 HC-260X2?
HC-260X2 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace HC-260X2?
There are 5 known substitutes for HC-260X2: G17188PC35, DD5610BPC5, G10147PC29 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for HC-260X2?
HC-260X2 is cataloged in the U.S. Government catalog under NSN 5340-00-346-3262. 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.