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74N — VALVE,EXPANSION

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

74N: VALVE,EXPANSION.

The VALVE,EXPANSION is a the manufacturer industrial component. Key specifications include material: ALUMINUM AND COPPER ALLOY AND STEEL BODY, special_features: FOR ELECTRIC DRIVE CHILLERS; CLOCKWISE FLOW CONTROL; HIGH FREQUENCY RESPONSE, WITHOUT GAGE; ADDITIONAL MATERIAL BUNA-B. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-597-1349, 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
74N
NSN: 5330-00-597-1349
NIINs: 005971349, 013773007
FSC: 5330 — Packing and Gasket Materials
CAGE: 830Q4 — CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DBA CURTISS-WRIGHT STEAM AND AIR SOLUTIONS DIV STEAM AND AIR SOLUTIONS (USA)
SPECIFICATIONS
materialALUMINUM AND COPPER ALLOY AND STEEL BODY
special_featuresFOR ELECTRIC DRIVE CHILLERS; CLOCKWISE FLOW CONTROL; HIGH FREQUENCY RESPONSE, WITHOUT GAGE; ADDITIONAL MATERIAL BUNA-B
NSN5330-00-597-1349
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 74N 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
•
CROSS-SECTIONAL THICKNESS: 0.007 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-F-1148,GR CH,FORM S MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
OUTSIDE DIAMETER: 8.250 INCHES NOMINAL IN
•
APERTURE DIAMETER: 6.031 INCHES NOMINAL IN
•
BOLT CIRCLE DIAMETER: 7.000 INCHES NOMINAL IN
•
MATERIAL: PAPER OVERALL
•
HOLE DIAMETER: 0.562 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL THICKNESS0.007 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-F-1148,GR CH,FORM S MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
OUTSIDE DIAMETER8.250 INCHES NOMINAL IN
APERTURE DIAMETER6.031 INCHES NOMINAL IN
BOLT CIRCLE DIAMETER7.000 INCHES NOMINAL IN
MATERIALPAPER OVERALL
HOLE DIAMETER0.562 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 74N?
74N is a VALVE,EXPANSION.
What is the NSN for 74N?
74N is cataloged in the U.S. Government catalog under NSN 5330-00-597-1349. 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.