PartsTable
Technical Data Sheet
MS21042L6 ✓ 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 OVERALL, nut_style: HEXAGON, lubrication: DRY FILM LUBRICANT, temp_rating: 450.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF). This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-807-1477, 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
MS21042L6
NSN: 5310-00-807-1477
FSC: 5310
CAGE: 97499 — BELL TEXTRON INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
lubricationDRY FILM LUBRICANT
temp_rating450.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.267 INCHES MINIMUM AND 0.282 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.030 INCHES MINIMUM IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_across_flats0.430 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
NSN5310-00-807-1477
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS21042L6 · 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
THREAD QUANTITY PER INCH: 24
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
NUT STYLE: HEXAGON
LUBRICATION: DRY FILM LUBRICANT
WASHER THICKNESS: 0.030 INCHES MINIMUM IN
NOMINAL THREAD SIZE: 0.375 INCHES IN
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
THREAD CLASS: 3B
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH24
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
NUT STYLEHEXAGON
LUBRICATIONDRY FILM LUBRICANT
WASHER THICKNESS0.030 INCHES MINIMUM IN
NOMINAL THREAD SIZE0.375 INCHES IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
THREAD CLASS3B
THREAD DIRECTIONRIGHT-HAND
WASHER OUTSIDE DIAMETER0.620 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
H146Interchangeable
interchangeable cross-reference
interchangeable
B128Interchangeable
interchangeable cross-reference
interchangeable
77924Interchangeable
interchangeable cross-reference
interchangeable
BAF8Interchangeable
interchangeable cross-reference
interchangeable
874025-11Interchangeable
interchangeable cross-reference
interchangeable
984051Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21042L6?
MS21042L6 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace MS21042L6?
There are 12 known substitutes for MS21042L6: H146, B128, 77924 and 9 more. Substitute compatibility should be verified for your specific system.
Is MS21042L6 still available?
MS21042L6 is currently cancelled.
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