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Technical Data Sheet
PartsTable / COMPONENT / 4FRU
4FRU ✓ 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 TOOL KIT,SCREW THREAD INSERT is a the manufacturer industrial component. Key specifications include length: 0.281 INCHES MINIMUM AND 0.343 INCHES MAXIMUM SQUARE END IN, material: STEEL OVERALL, thread_length: 1.062 INCHES MINIMUM AND 1.188 INCHES MAXIMUM IN, overall_length: 2.680 INCHES MINIMUM AND 2.750 INCHES MAXIMUM IN, shank_diameter: 0.3165 INCHES MINIMUM AND 0.3180 INCHES MAXIMUM IN, special_features: ROUGHING 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 5136-00-104-4158, 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
4FRU
NSN: 5136-00-104-4158
FSC: 5136
CAGE: 01556 — STANLEY ENGINEERED FASTENING LLC (USA)
SPECIFICATIONS
length0.281 INCHES MINIMUM AND 0.343 INCHES MAXIMUM SQUARE END IN
materialSTEEL OVERALL
thread_length1.062 INCHES MINIMUM AND 1.188 INCHES MAXIMUM IN
flute_quantity3
overall_length2.680 INCHES MINIMUM AND 2.750 INCHES MAXIMUM IN
shank_diameter0.3165 INCHES MINIMUM AND 0.3180 INCHES MAXIMUM IN
special_featuresROUGHING TAP FOR SCREW THREAD INSERT
style_designatorSPIRAL POINTED FLUTE
thread_structureREGULAR
width_across_flats0.234 INCHES MINIMUM AND 0.238 INCHES MAXIMUM IN
starting_chamfer_typePLUG
thread_pitch_diameters+0.2737 TO 0.2742 INCHES IN
NSN5136-00-104-4158
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available TOOL KIT,SCREW THREAD INSERT TITLE COMPONENT PN 4FRU MFR TOOL KIT,SCREW THREAD
KEY FEATURES
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0.250-28 STI
•
STYLE DESIGNATOR: SPIRAL POINTED FLUTE
•
THREAD STRUCTURE: REGULAR
•
SHANK DIAMETER: 0.3165 INCHES MINIMUM AND 0.3180 INCHES MAXIMUM IN
•
THREAD LENGTH: 1.062 INCHES MINIMUM AND 1.188 INCHES MAXIMUM IN
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 2 CLASS
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESROUGHING TAP FOR SCREW THREAD INSERT
OVERALL LENGTH2.680 INCHES MINIMUM AND 2.750 INCHES MAXIMUM IN
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.250-28 STI
STYLE DESIGNATORSPIRAL POINTED FLUTE
THREAD STRUCTUREREGULAR
SHANK DIAMETER0.3165 INCHES MINIMUM AND 0.3180 INCHES MAXIMUM IN
THREAD LENGTH1.062 INCHES MINIMUM AND 1.188 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 2 CLASS
MATERIALSTEEL OVERALL
STARTING CHAMFER TYPEPLUG
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
4CRUInterchangeable
interchangeable cross-reference
interchangeable
MIL-T-21309 TY1CL2Interchangeable
interchangeable cross-reference
interchangeable
MIL-T-21309Interchangeable
interchangeable cross-reference
interchangeable
5FRUInterchangeable
interchangeable cross-reference
interchangeable
6CRUInterchangeable
interchangeable cross-reference
interchangeable
41T1368-1895Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4FRU?
4FRU is a TOOL KIT,SCREW THREAD INSERT.
What parts can replace 4FRU?
There are 15 known substitutes for 4FRU: 4CRU, MIL-T-21309 TY1CL2, MIL-T-21309 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4FRU?
4FRU is cataloged in the Federal Logistics Information System (FLIS) under NSN 5136-00-104-4158. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026