PartsTable
Technical Data Sheet
MILN21337 ✓ 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,PLAIN,ROUND is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OVERALL, nut_style: ROUND, nut_diameter: 1.032 INCHES MINIMUM AND 1.052 INCHES MAXIMUM IN, thread_class: 3B, nut_thickness: 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN, thread_series: UNEF. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-150-3959, 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
MILN21337
NSN: 5310-00-150-3959
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 4140 OVERALL
nut_styleROUND
nut_diameter1.032 INCHES MINIMUM AND 1.052 INCHES MAXIMUM IN
thread_class3B
nut_thickness0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
thread_seriesUNEF
hardness_rating26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
countersink_angle90.0 DEGREES MINIMUM AND 120.0 DEGREES MAXIMUM BOTH ENDS
drive_point_depth0.062 INCHES NOMINAL IN
drive_point_width0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
surface_treatmentPHOSPHATE OVERALL
NSN5310-00-150-3959
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MILN21337 · 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
DRIVE POINT DEPTH: 0.094 INCHES NOMINAL IN
NUT STYLE: ROUND
NUT THICKNESS: 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
THREAD SERIES: UNS
HARDNESS RATING: 90.0 ROCKWELL B MAXIMUM
THREAD QUANTITY PER INCH: 18
NOMINAL THREAD SIZE: 1.767 INCHES IN
DRIVE POINT QUANTITY: 4
TECHNICAL CHARACTERISTICS (FLIS)
DRIVE POINT DEPTH0.094 INCHES NOMINAL IN
NUT STYLEROUND
NUT THICKNESS0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
THREAD SERIESUNS
HARDNESS RATING90.0 ROCKWELL B MAXIMUM
THREAD QUANTITY PER INCH18
NOMINAL THREAD SIZE1.767 INCHES IN
DRIVE POINT QUANTITY4
THREAD PITCH DIAMETERS+1.7309 TO 1.7354 INCHES IN
COUNTERSINK ANGLE45.0 DEGREES MINIMUM AND 60.0 DEGREES MAXIMUM SECOND END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 1
MS19068-093Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MILN21337?
MILN21337 is a NUT,PLAIN,ROUND.
What parts can replace MILN21337?
There is 1 known substitute for MILN21337: MS19068-093. Substitute compatibility should be verified for your specific system.
What is the NSN for MILN21337?
MILN21337 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-150-3959. This indicates validated use in U.S. government and defense supply chains.
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