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A121-55 — Technical Data Sheet

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— · COMPONENT
WHAT YOU NEED TO KNOW
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Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The INSULATOR,BUSHING is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYAMIDE NYLON OVERALLPLASTIC POLYAMIDE NYLON OVERALL, shank_height: 0.020 INCHES MINIMUM AND 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM0.030 INCHES MAXIMUM IN, overall_height: 0.094 INCHES NOMINAL0.094 INCHES NOMINAL IN, inside_diameter: 0.255 INCHES MINIMUM AND 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM0.265 INCHES MAXIMUM IN, outside_diameter: 0.500 INCHES MINIMUM AND 0.500 INCHES MINIMUM AND 0.516 INCHES MAXIMUM0.516 INCHES MAXIMUM IN, style_designator: SHOULDERSHOULDER. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5970-00-630-1605, 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
A121-55
NSN: 5970-00-630-1605
FSC: 5970
CAGE: 86928 — SEASTROM MANUFACTURING CO INC (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON OVERALLPLASTIC POLYAMIDE NYLON OVERALL
shank_height0.020 INCHES MINIMUM AND 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM0.030 INCHES MAXIMUM IN
overall_height0.094 INCHES NOMINAL0.094 INCHES NOMINAL IN
inside_diameter0.255 INCHES MINIMUM AND 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM0.265 INCHES MAXIMUM IN
outside_diameter0.500 INCHES MINIMUM AND 0.500 INCHES MINIMUM AND 0.516 INCHES MAXIMUM0.516 INCHES MAXIMUM IN
style_designatorSHOULDERSHOULDER
shank_outside_diameter0.333 INCHES MINIMUM AND 0.333 INCHES MINIMUM AND 0.343 INCHES MAXIMUM0.343 INCHES MAXIMUM IN
NSN5970-00-630-1605
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available INSULATOR,BUSHING TITLE COMPONENT PN A121-55 MFR INSULATOR,BUSHING
KEY FEATURES
•
SHANK HEIGHT: 0.020 INCHES MINIMUM AND 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM0.030 INCHES MAXIMUM IN
•
SHANK OUTSIDE DIAMETER: 0.333 INCHES MINIMUM AND 0.333 INCHES MINIMUM AND 0.343 INCHES MAXIMUM0.343 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SHOULDERSHOULDER
•
MATERIAL: PLASTIC POLYAMIDE NYLON OVERALLPLASTIC POLYAMIDE NYLON OVERALL
•
INSIDE DIAMETER: 0.255 INCHES MINIMUM AND 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM0.265 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.500 INCHES MINIMUM AND 0.500 INCHES MINIMUM AND 0.516 INCHES MAXIMUM0.516 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SHANK HEIGHT0.020 INCHES MINIMUM AND 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM0.030 INCHES MAXIMUM IN
SHANK OUTSIDE DIAMETER0.333 INCHES MINIMUM AND 0.333 INCHES MINIMUM AND 0.343 INCHES MAXIMUM0.343 INCHES MAXIMUM IN
STYLE DESIGNATORSHOULDERSHOULDER
MATERIALPLASTIC POLYAMIDE NYLON OVERALLPLASTIC POLYAMIDE NYLON OVERALL
OVERALL HEIGHT0.094 INCHES NOMINAL0.094 INCHES NOMINAL IN
INSIDE DIAMETER0.255 INCHES MINIMUM AND 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM0.265 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.500 INCHES MINIMUM AND 0.500 INCHES MINIMUM AND 0.516 INCHES MAXIMUM0.516 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 1
12155InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A121-55?
A121-55 is a INSULATOR,BUSHING.
What parts can replace A121-55?
There is 1 known substitute for A121-55: 12155. Substitute compatibility should be verified for your specific system.
What is the NSN for A121-55?
A121-55 is cataloged in the Federal Logistics Information System under NSN 5970-00-630-1605. This indicates validated use in U.S. government and defense supply chains.
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Last verified: September 2026