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PartsTable / COMPONENT / 999-4-01947-008
999-4-01947-008 ✓ 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: IRON ALLOY 660 NUT, nut_style: HEXAGON, lubrication: DRY FILM LUBRICANT, temp_rating: 500.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNF. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-956-3644, 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
999-4-01947-008
NSN: 5310-00-956-3644
FSC: 5310
CAGE: K0668 — LEONARDO UK LTD (GBR)
SPECIFICATIONS
materialIRON ALLOY 660 NUT
nut_styleHEXAGON
lubricationDRY FILM LUBRICANT
temp_rating500.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNF
overall_height0.245 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
special_featuresAIRWORTHY CERTIFICATED ITEM SUPPLIED WITH CERTIFICATE OF CONFORMITY DOCUMENTATION
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE WASHER
width_across_flats0.3125 INCHES NOMINAL IN
NSN5310-00-956-3644
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 999-4-01947-008 · 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 WASHER
•
MATERIAL: IRON ALLOY 660 NUT
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
THREAD QUANTITY PER INCH: 28
•
THREAD SERIES: UNF
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL HEIGHT0.245 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE WASHER
MATERIALIRON ALLOY 660 NUT
SPECIAL FEATURESAIRWORTHY CERTIFICATED ITEM SUPPLIED WITH CERTIFICATE OF CONFORMITY DOCUMENTATION
NOMINAL THREAD SIZE0.250 INCHES IN
THREAD QUANTITY PER INCH28
THREAD SERIESUNF
END ITEM IDENTIFICATIONNOT KNOWN
WIDTH ACROSS FLATS0.3125 INCHES NOMINAL IN
TEMP RATING500.0 FAHRENHEIT NOMINAL DEGF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
4002-5WInterchangeable
interchangeable cross-reference
interchangeable
FA1036Interchangeable
interchangeable cross-reference
interchangeable
BACS21ED5WInterchangeable
interchangeable cross-reference
interchangeable
AIRWORTHY CERTIFICATED ITEMInterchangeable
interchangeable cross-reference
interchangeable
100-115-0073Interchangeable
interchangeable cross-reference
interchangeable
100-222-0073Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 999-4-01947-008?
999-4-01947-008 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace 999-4-01947-008?
There are 19 known substitutes for 999-4-01947-008: 4002-5W, FA1036, BACS21ED5W and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 999-4-01947-008?
999-4-01947-008 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-956-3644. 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