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E1903PC7 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

E1903PC7: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: COPPER ALLOY, design_type: SOLID, end_diameter: 1.2188 INCHES NOMINAL IN, bore_diameter: 0.2813 INCHES NOMINAL IN, overall_height: 0.3125 INCHES NOMINAL IN, style_designator: SEAT. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-035-7148, 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
E1903PC7
NSN: 5340-00-035-7148
FSC: 5340 — Hardware, Commercial
CAGE: 07524 — DOVER PUMPS & PROCESS SOLUTIONS SEGMENT INC DBA BLACKMER DIV BLACKMER (USA)
SPECIFICATIONS
materialCOPPER ALLOY
design_typeSOLID
end_diameter1.2188 INCHES NOMINAL IN
bore_diameter0.2813 INCHES NOMINAL IN
overall_height0.3125 INCHES NOMINAL IN
style_designatorSEAT
counterbore_length0.1563 INCHES NOMINAL IN
first_step_diameter1.7500 INCHES NOMINAL IN
countersink_diameter0.6250 INCHES NOMINAL IN
countersink_angle_in_deg45.0
distance_from_end_to_first_step0.1563 INCHES NOMINAL IN
NSN5340-00-035-7148
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: E1903PC7 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
•
COUNTERSINK ANGLE IN DEG: 45.0
•
FIRST STEP DIAMETER: 1.7500 INCHES NOMINAL IN
•
END DIAMETER: 1.2188 INCHES NOMINAL IN
•
COUNTERSINK DIAMETER: 0.6250 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 0.1563 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
•
STYLE DESIGNATOR: SEAT
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.3125 INCHES NOMINAL IN
COUNTERSINK ANGLE IN DEG45.0
FIRST STEP DIAMETER1.7500 INCHES NOMINAL IN
END DIAMETER1.2188 INCHES NOMINAL IN
COUNTERSINK DIAMETER0.6250 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.1563 INCHES NOMINAL IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
COUNTERBORE LENGTH0.1563 INCHES NOMINAL IN
BORE DIAMETER0.2813 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 9
E2366PC7Reference document
Same NSN cross-reference
Reference document — Secondary reference
E2103PC7Reference document
Same NSN cross-reference
Reference document — Secondary reference
E2325PC7Reference document
Same NSN cross-reference
Reference document — Secondary reference
E2104PC7Reference document
Same NSN cross-reference
Reference document — Secondary reference
E2327PC7Reference document
Same NSN cross-reference
Reference document — Secondary reference
E1727PC7Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 E1903PC7?
E1903PC7 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace E1903PC7?
There are 9 known substitutes for E1903PC7: E2366PC7, E2103PC7, E2325PC7 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for E1903PC7?
E1903PC7 is cataloged in the U.S. Government catalog under NSN 5340-00-035-7148. 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.