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PartsTable / COMPONENT / ST1178-10
ST1178-10 ✓ 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

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL COMP 1035 OVERALL, nut_style: DOUBLE HEXAGON, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.225 INCHES MINIMUM AND 0.235 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 5310-00-199-3746, 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
ST1178-10
NSN: 5310-00-199-3746
FSC: 5310
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL COMP 1035 OVERALL
nut_styleDOUBLE HEXAGON
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.225 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM IN
countersink_angle85.0 DEGREES MINIMUM AND 95.0 DEGREES MAXIMUM NUT
surface_treatmentCADMIUM OVERALL
width_across_flats0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
nominal_thread_size0.250 INCHES IN
NSN5310-00-199-3746
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ST1178-10 · 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
•
WASHER THICKNESS: 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM IN
•
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
THREAD QUANTITY PER INCH: 28
•
MATERIAL: STEEL COMP 1035 OVERALL
•
WASHER OUTSIDE DIAMETER: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
WASHER THICKNESS0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM IN
OVERALL HEIGHT0.225 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
NOMINAL THREAD SIZE0.250 INCHES IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
THREAD QUANTITY PER INCH28
MATERIALSTEEL COMP 1035 OVERALL
WASHER OUTSIDE DIAMETER0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
THREAD CLASS3B
WIDTH ACROSS FLATS0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
ST1166-10Interchangeable
interchangeable cross-reference
interchangeable
564706Interchangeable
interchangeable cross-reference
interchangeable
LH9292-4Interchangeable
interchangeable cross-reference
interchangeable
649734Interchangeable
interchangeable cross-reference
interchangeable
FP4 PLUSInterchangeable
interchangeable cross-reference
interchangeable
B00106-4Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST1178-10?
ST1178-10 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace ST1178-10?
There are 7 known substitutes for ST1178-10: ST1166-10, 564706, LH9292-4 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST1178-10?
ST1178-10 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-199-3746. 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