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257-4238 ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The 257-4238 is a the manufacturer industrial component. Key specifications include color: BLACK, overall_depth: 0.438 INCHES NOMINAL IN, inside_diameter: 0.250 INCHES NOMINAL IN, outside_diameter: 0.750 INCHES NOMINAL IN, screw_drive_type: HEXAGON SOCKET, style_designator: CROWN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5355-00-538-6636, 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
257-4238
NSN: 5355-00-538-6636
FSC: 5355
CAGE: 11530 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN INFORMATION SYSTEMS & GLOBAL SOLUTIONS (USA)
SPECIFICATIONS
colorBLACK
overall_depth0.438 INCHES NOMINAL IN
inside_diameter0.250 INCHES NOMINAL IN
outside_diameter0.750 INCHES NOMINAL IN
screw_drive_typeHEXAGON SOCKET
style_designatorCROWN
attachment_methodSETSCREWS
overall_thickness0.563 INCHES NOMINAL IN
setscrew_hole_quantity2
shaft_accommodation_styleROUND
gripping_surface_conditionGRIP AID
distance_from_hole_center_to_knob/skirt_base0.188 INCHES NOMINAL IN
NSN5355-00-538-6636
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available 257-4238 TITLE COMPONENT PN 257-4238 MFR 257-4238
KEY FEATURES
•
SHAFT ACCOMMODATION STYLE: ROUND
•
STYLE DESIGNATOR: CROWN
•
OVERALL THICKNESS: 0.563 INCHES NOMINAL IN
•
GRIPPING SURFACE CONDITION: GRIP AID
•
SETSCREW HOLE QUANTITY: 2
•
ATTACHMENT METHOD: SETSCREWS
•
INSIDE DIAMETER: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SHAFT ACCOMMODATION STYLEROUND
STYLE DESIGNATORCROWN
OVERALL THICKNESS0.563 INCHES NOMINAL IN
GRIPPING SURFACE CONDITIONGRIP AID
SETSCREW HOLE QUANTITY2
ATTACHMENT METHODSETSCREWS
INSIDE DIAMETER0.250 INCHES NOMINAL IN
OVERALL DEPTH0.438 INCHES NOMINAL IN
DISTANCE FROM HOLE CENTER TO KNOB/SKIRT BASE0.188 INCHES NOMINAL IN
SCREW DRIVE TYPEHEXAGON SOCKET
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
1JB3892-2Interchangeable
interchangeable cross-reference
interchangeable
2021794Interchangeable
interchangeable cross-reference
interchangeable
SMB289535Interchangeable
interchangeable cross-reference
interchangeable
287118Interchangeable
interchangeable cross-reference
interchangeable
60543Interchangeable
interchangeable cross-reference
interchangeable
09A383Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 257-4238?
257-4238 is a 257-4238.
What parts can replace 257-4238?
There are 12 known substitutes for 257-4238: 1JB3892-2, 2021794, SMB289535 and 9 more. Substitute compatibility should be verified for your specific system.
Is 257-4238 still available?
257-4238 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026