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PartsTable / COMPONENT / 73783CM1032
73783CM1032 ✓ 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 OVERALL, nut_style: CASTELLATED HEXAGON, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.172 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN, hardness_rating: 29.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-281-8551, 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
73783CM1032
NSN: 5310-01-281-8551
FSC: 5310
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
nut_styleCASTELLATED HEXAGON
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.172 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN
hardness_rating29.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
washer_thickness0.020 INCHES NOMINAL IN
width_across_flats0.243 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN
nominal_thread_size0.190 INCHES IN
end_item_identificationPACER SPECIAL
washer_outside_diameter0.325 INCHES MAXIMUM IN
NSN5310-01-281-8551
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 73783CM1032 · 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
TECHNICAL CHARACTERISTICS (FLIS)
END ITEM IDENTIFICATIONPACER SPECIAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
9131M74P31Interchangeable
interchangeable cross-reference
interchangeable
H49403-3Interchangeable
interchangeable cross-reference
interchangeable
73783CM1032Interchangeable
interchangeable cross-reference
interchangeable
03A187-3LInterchangeable
Same NIIN cross-reference
interchangeable
BH187-3Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 73783CM1032?
73783CM1032 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace 73783CM1032?
There are 5 known substitutes for 73783CM1032: 9131M74P31, H49403-3, 73783CM1032 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 73783CM1032?
73783CM1032 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-281-8551. 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