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PartsTable / COMPONENT / BLK4148
BLK4148 ✓ 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

CROWFOOT ATTACHMENT,SOCKET WRENC. Key specifications include material: STEEL OVERALL, head_thickness: 1.000 INCHES MAXIMUM IN, overall_length: 12.750 INCHES MINIMUM IN, style_designator: FLARE NUT SINGLE END, surface_treatment: PHOSPHATE OVERALL, wrenching_surface_size: 1.500 INCHES NOMINAL SINGLE END IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5120-00-277-5072, 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
BLK4148
NSN: 5120-00-277-5072
FSC: 5120
CAGE: 05506 — MARTIN SPROCKET AND GEAR INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_thickness1.000 INCHES MAXIMUM IN
overall_length12.750 INCHES MINIMUM IN
style_designatorFLARE NUT SINGLE END
surface_treatmentPHOSPHATE OVERALL
wrenching_surface_size1.500 INCHES NOMINAL SINGLE END IN
wrenching_surface_shape12 POINT SINGLE END INTERNAL
nondefinitive_spec/std_data2 TYPE AND 2 CLASS AND D STYLE
specification/standard_data0U583-SAE AS4167 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NSN5120-00-277-5072
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CROWFOOT ATTACHMENT,SOCKET WRENC TITLE COMPONENT PN BLK4148 MFR CROWFOOT ATTACHMENT,SO
KEY FEATURES
•
HEAD THICKNESS: 1.000 INCHES MAXIMUM IN
•
SPECIFICATION/STANDARD DATA: 0U583-SAE AS4167 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
WRENCHING SURFACE SHAPE: 12 POINT SINGLE END INTERNAL
•
SURFACE TREATMENT: PHOSPHATE OVERALL
•
WRENCHING SURFACE SIZE: 1.500 INCHES NOMINAL SINGLE END IN
•
MATERIAL: STEEL OVERALL
•
STYLE DESIGNATOR: FLARE NUT SINGLE END
TECHNICAL CHARACTERISTICS (FLIS)
HEAD THICKNESS1.000 INCHES MAXIMUM IN
SPECIFICATION/STANDARD DATA0U583-SAE AS4167 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
WRENCHING SURFACE SHAPE12 POINT SINGLE END INTERNAL
SURFACE TREATMENTPHOSPHATE OVERALL
OVERALL LENGTH12.750 INCHES MINIMUM IN
WRENCHING SURFACE SIZE1.500 INCHES NOMINAL SINGLE END IN
MATERIALSTEEL OVERALL
STYLE DESIGNATORFLARE NUT SINGLE END
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 2 CLASS AND D STYLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
4148Interchangeable
interchangeable cross-reference
interchangeable
33-04148-1AInterchangeable
interchangeable cross-reference
interchangeable
33-04148-0AInterchangeable
interchangeable cross-reference
interchangeable
307561Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-6615Interchangeable
interchangeable cross-reference
interchangeable
MILH6615Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BLK4148?
BLK4148 is a CROWFOOT ATTACHMENT,SOCKET WRENC.
What parts can replace BLK4148?
There are 21 known substitutes for BLK4148: 4148, 33-04148-1A, 33-04148-0A and 18 more. Substitute compatibility should be verified for your specific system.
Is BLK4148 still available?
BLK4148 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