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Technical Data Sheet
4CBB ✓ 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

TANG BREAKOFF TOOL,SCREW THREAD. Key specifications include length: 0.375 INCHES NOMINAL SQUARE END IN, material: STEEL OVERALL, thread_length: 1.125 INCHES NOMINAL IN, overall_length: 2.719 INCHES NOMINAL IN, shank_diameter: 0.318 INCHES MAXIMUM IN, special_features: FINISHING TAP FOR SCREW THREAD INSERT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5136-00-972-0406, 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
4CBB
NSN: 5136-00-972-0406
FSC: 5136
CAGE: 01556 — STANLEY ENGINEERED FASTENING LLC (USA)
SPECIFICATIONS
length0.375 INCHES NOMINAL SQUARE END IN
materialSTEEL OVERALL
thread_length1.125 INCHES NOMINAL IN
flute_quantity4
overall_length2.719 INCHES NOMINAL IN
shank_diameter0.318 INCHES MAXIMUM IN
special_featuresFINISHING TAP FOR SCREW THREAD INSERT
style_designatorSTRAIGHT FLUTE
thread_directionRIGHT-HAND
thread_structureREGULAR
width_across_flats0.238 INCHES NOMINAL IN
starting_chamfer_typeBOTTOMING
NSN5136-00-972-0406
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available TANG BREAKOFF TOOL,SCREW THREAD TITLE COMPONENT PN 4CBB MFR TANG BREAKOFF TOOL,SCR
KEY FEATURES
THREAD LENGTH: 1.125 INCHES NOMINAL IN
STARTING CHAMFER TYPE: BOTTOMING
WIDTH ACROSS FLATS: 0.238 INCHES NOMINAL IN
THREAD FORMING METHOD: GROUND
LENGTH: 0.375 INCHES NOMINAL SQUARE END IN
THREAD STRUCTURE: REGULAR
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 3 CLASS
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH1.125 INCHES NOMINAL IN
STARTING CHAMFER TYPEBOTTOMING
WIDTH ACROSS FLATS0.238 INCHES NOMINAL IN
SPECIAL FEATURESFINISHING TAP FOR SCREW THREAD INSERT
THREAD FORMING METHODGROUND
LENGTH0.375 INCHES NOMINAL SQUARE END IN
THREAD STRUCTUREREGULAR
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 3 CLASS
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.250-20 STI
SPECIFICATION/STANDARD DATA0U583-SAE AS59158 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
MIL-T-21309Interchangeable
interchangeable cross-reference
interchangeable
AS59158Interchangeable
interchangeable cross-reference
interchangeable
AS59158 TY1CL3Interchangeable
interchangeable cross-reference
interchangeable
3993-8Interchangeable
interchangeable cross-reference
interchangeable
3893-3Interchangeable
interchangeable cross-reference
interchangeable
3993-6Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4CBB?
4CBB is a TANG BREAKOFF TOOL,SCREW THREAD.
What parts can replace 4CBB?
There are 12 known substitutes for 4CBB: MIL-T-21309, AS59158, AS59158 TY1CL3 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4CBB?
4CBB is cataloged in the Federal Logistics Information System (FLIS) under NSN 5136-00-972-0406. This indicates validated use in U.S. government and defense supply chains.
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