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Technical Data Sheet
A78121 ✓ Verified by PartsTable
· COMPONENT
WHAT YOU NEED TO KNOW
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Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The TEE,WATER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.191 INCHES MINIMUM AND 0.196 INCHES MAXIMUM IN, hardness_rating: 30.0 ROCKWELL B MINIMUM AND 50.0 ROCKWELL B MAXIMUM, outside_diameter: 0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN, style_designator: KEY, surface_treatment: CADMIUM OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2815-00-036-5413, 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
A78121
NSN: 2815-00-036-5413
FSC: 2815
CAGE: 58275 — SASCO INC CANADIAN DIV
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.191 INCHES MINIMUM AND 0.196 INCHES MAXIMUM IN
hardness_rating30.0 ROCKWELL B MINIMUM AND 50.0 ROCKWELL B MAXIMUM
outside_diameter0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
style_designatorKEY
surface_treatmentCADMIUM OVERALL
material_thickness0.026 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
external_key_quantity6
external_straight_key_width0.104 INCHES MINIMUM AND 0.114 INCHES MAXIMUM IN
overall_distance_including_keys0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
surface_treatment_document_and_classificationAN-QQ-P-421 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN2815-00-036-5413
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available TEE,WATER TITLE COMPONENT PN A78121 MFR TEE,WATER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
A78-121Interchangeable
interchangeable cross-reference
interchangeable
78-121Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A78121?
A78121 is a TEE,WATER.
What parts can replace A78121?
There are 2 known substitutes for A78121: A78-121, 78-121. Substitute compatibility should be verified for your specific system.
What is the NSN for A78121?
A78121 is cataloged in the Federal Logistics Information System (FLIS) under NSN 2815-00-036-5413. This indicates validated use in U.S. government and defense supply chains.
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