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U-178 ✓ 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 LOCK,VALVE SPRING RETAINER is a the manufacturer industrial component. Key specifications include material: STEEL BAND, overall_height: 0.125 INCHES NOMINAL IN, style_designator: TWO PIECE, thread_provision: UNTHREADED, material_diameter: 0.312 INCHES NOMINAL IN, loop_inside_diameter: 1.875 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2805-00-349-4701, 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
U-178
NSN: 2805-00-349-4701
FSC: 2805
CAGE: 19239 — ECHLIN INC (USA)
SPECIFICATIONS
materialSTEEL BAND
overall_height0.125 INCHES NOMINAL IN
style_designatorTWO PIECE
thread_provisionUNTHREADED
material_diameter0.312 INCHES NOMINAL IN
loop_inside_diameter1.875 INCHES NOMINAL IN
casehardening_indicatorCASEHARDENED
largest_inside_diameter0.283 INCHES NOMINAL IN
largest_outside_diameter0.629 INCHES NOMINAL IN
integral_nut_type_and_quantity2 PLAIN U BOLT
NSN2805-00-349-4701
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available LOCK,VALVE SPRING RETAINER TITLE COMPONENT PN U-178 MFR LOCK,VALVE SPRING RETA
KEY FEATURES
•
LARGEST OUTSIDE DIAMETER: 0.629 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT BORE-STRAIGHT SIDES W/ROUNDED CORNERS
•
THREAD PROVISION: UNTHREADED
•
LARGEST INSIDE DIAMETER: 0.283 INCHES NOMINAL IN
•
MATERIAL: STEEL
•
CASEHARDENING INDICATOR: CASEHARDENED
TECHNICAL CHARACTERISTICS (FLIS)
LARGEST OUTSIDE DIAMETER0.629 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE-STRAIGHT SIDES W/ROUNDED CORNERS
THREAD PROVISIONUNTHREADED
LARGEST INSIDE DIAMETER0.283 INCHES NOMINAL IN
MATERIALSTEEL
CASEHARDENING INDICATORCASEHARDENED
OVERALL HEIGHT0.125 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
H274Interchangeable
interchangeable cross-reference
interchangeable
A1205E135Interchangeable
interchangeable cross-reference
interchangeable
037675Interchangeable
interchangeable cross-reference
interchangeable
313-26AB22Interchangeable
interchangeable cross-reference
interchangeable
313-26AB22VInterchangeable
interchangeable cross-reference
interchangeable
42147Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is U-178?
U-178 is a LOCK,VALVE SPRING RETAINER.
What parts can replace U-178?
There are 10 known substitutes for U-178: H274, A1205E135, 037675 and 7 more. Substitute compatibility should be verified for your specific system.
Is U-178 still available?
U-178 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