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A740-81 — TRANSFORMER,POWER

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

A740-81: TRANSFORMER,POWER.

The TRANSFORMER,POWER is a the manufacturer industrial component. Key specifications include material: CELLULOSE OVERALL, body_width: 2.865 INCHES MINIMUM AND 2.885 INCHES MAXIMUM IN, body_height: 4.240 INCHES MINIMUM AND 4.260 INCHES MAXIMUM IN, body_length: 3.490 INCHES MINIMUM AND 3.510 INCHES MAXIMUM IN, hole_diameter: 0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, overall_width: 4.263 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-318-3695, 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
A740-81
NSN: 5330-00-318-3695
NIINs: 003183695, 007068728
FSC: 5330 — Packing and Gasket Materials
CAGE: 58275 — SASCO INC CANADIAN DIV
SPECIFICATIONS
materialCELLULOSE OVERALL
body_width2.865 INCHES MINIMUM AND 2.885 INCHES MAXIMUM IN
body_height4.240 INCHES MINIMUM AND 4.260 INCHES MAXIMUM IN
body_length3.490 INCHES MINIMUM AND 3.510 INCHES MAXIMUM IN
hole_diameter0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width4.263 INCHES NOMINAL IN
inclosure_typeFULLY INCLOSED
overall_length4.661 INCHES NOMINAL IN
mounting_methodTHREADED STUD(S) SINGLE GROUP
frequency_rating400.0 HERTZ NOMINAL SINGLE COMPONENT
special_featuresTWO BOLT HOLS 0.438 IN. DIA IN
aperture_diameter2.938 INCHES NOMINAL IN
NSN5330-00-318-3695
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A740-81 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: 0.027 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: A-920 FSCM 58275 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
APERTURE DIAMETER: 2.938 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 5
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL THICKNESS0.027 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONA-920 FSCM 58275 MFR REF SINGLE MATERIAL RESPONSE OVERALL
OVERALL LENGTH4.661 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
OVERALL WIDTH4.263 INCHES NOMINAL IN
APERTURE DIAMETER2.938 INCHES NOMINAL IN
BOLT HOLE QUANTITY5
SPECIAL FEATURESTWO BOLT HOLS 0.438 IN. DIA IN
MATERIALCELLULOSE OVERALL
HOLE DIAMETER0.344 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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A740-81?
A740-81 is a TRANSFORMER,POWER.
What is the NSN for A740-81?
A740-81 is cataloged in the U.S. Government catalog under NSN 5330-00-318-3695. 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.