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103978 — PAD,RELAY,INDICATOR

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

103978: PAD,RELAY,INDICATOR.

The PAD,RELAY,INDICATOR is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYAMIDE NYLON BODY, body_style: PLAIN, SOLID, bore_style: PLAIN BOTH ENDS, tooth_form: STANDARD, pitch_diameter: 1.3542 INCHES NOMINAL IN, pressure_angle: 20.0000 DEGREES. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-464-6913, 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
MRO→ MRO_GENERAL→ 103978
NSN: 5340-00-464-6913
NIINs: 004646913, 008322374, 010704703
FSC: 5340 — Hardware, Commercial
CAGE: 10138 — ASTRONAUTICS CORPORATION OF AMERICA (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON BODY
body_stylePLAIN, SOLID
bore_stylePLAIN BOTH ENDS
tooth_formSTANDARD
pitch_diameter1.3542 INCHES NOMINAL IN
pressure_angle20.0000 DEGREES
teeth_quantity130
special_featuresMTG HOLES 180 DEGS APART
style_designatorPROTRUDING HUBS
surface_treatmentPASSIVATE HUB
face_nominal_width0.188 INCHES IN
hub_nominal_diameter0.500 INCHES FIRST END IN
NSN5340-00-464-6913
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 103978 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
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 103978?
103978 is a PAD,RELAY,INDICATOR. It is classified as a MRO (MRO_GENERAL).
What is the NSN for 103978?
103978 is cataloged in the U.S. Government catalog under NSN 5340-00-464-6913. 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.