PartsTable
Technical Data Sheet
990C178H01 ✓ Verified by PartsTable
· NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The NUT,SELF-LOCKING,CLINCH is a the manufacturer industrial component. Key specifications include nut_height: 0.277 INCHES NOMINAL IN, pilot_length: 0.050 INCHES MINIMUM AND 0.062 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), pilot_diameter: 0.286 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN, locking_feature: PREVAILING TORQUE ALL METAL DESIGN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-238-0644, 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
990C178H01
NSN: 5310-01-238-0644
FSC: 5310
CAGE: 18323 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA ELECTRONIC SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 303 PLUS X OR STEEL COMP 303CU OR STEEL COMP 303MA OR STEEL COMP 303PB OVERALL
nut_height0.277 INCHES NOMINAL IN
pilot_length0.050 INCHES MINIMUM AND 0.062 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
pilot_diameter0.286 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
features_providedFLOATING NUT
surface_treatmentPASSIVATE OVERALL
width_across_flats0.344 INCHES NOMINAL IN
nominal_thread_size0.112 INCHES IN
NSN5310-01-238-0644
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 990C178H01 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
SURFACE TREATMENT: PASSIVATE OVERALL
THREAD DIRECTION: RIGHT-HAND
PILOT LENGTH: 0.050 INCHES MINIMUM AND 0.062 INCHES MAXIMUM IN
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
NUT HEIGHT: 0.277 INCHES NOMINAL IN
WIDTH ACROSS FLATS: 0.344 INCHES NOMINAL IN
NOMINAL THREAD SIZE: 0.112 INCHES IN
FEATURES PROVIDED: FLOATING NUT
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTPASSIVATE OVERALL
THREAD DIRECTIONRIGHT-HAND
PILOT LENGTH0.050 INCHES MINIMUM AND 0.062 INCHES MAXIMUM IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
NUT HEIGHT0.277 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.344 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.112 INCHES IN
FEATURES PROVIDEDFLOATING NUT
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH40
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
7178-1Interchangeable
interchangeable cross-reference
interchangeable
7178201Interchangeable
interchangeable cross-reference
interchangeable
36012Interchangeable
Premium Services Plan f/ PX12R-350R, 2TB Kit, 5Y, 4h, 24x7
interchangeable
114FLN(0.062)Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 990C178H01?
990C178H01 is a NUT,SELF-LOCKING,CLINCH.
What parts can replace 990C178H01?
There are 4 known substitutes for 990C178H01: 7178-1, 7178201, 36012 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 990C178H01?
990C178H01 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-238-0644. This indicates validated use in U.S. government and defense supply chains.
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