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Technical Data Sheet
PartsTable / COMPONENT / 03A111-3-7
03A111-3-7 ✓ 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,CLIP-ON is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, nut_style: ANCHORANCHOR, lubrication: DRY FILM LUBRICANTDRY FILM LUBRICANT, thread_class: 3B3B, overall_width: 0.447 INCHES MAXIMUM0.447 INCHES MAXIMUM IN, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF). This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-351-5342, 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
03A111-3-7
NSN: 5310-01-351-5342
FSC: 5310
CAGE: 76823 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN IS DIV NORTHROP GRUMMAN AERONAUTICS SYSTEMS (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
nut_styleANCHORANCHOR
lubricationDRY FILM LUBRICANTDRY FILM LUBRICANT
thread_class3B3B
overall_width0.447 INCHES MAXIMUM0.447 INCHES MAXIMUM IN
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
panel_thickness0.170 INCHES MAXIMUM0.170 INCHES MAXIMUM IN
thread_directionRIGHT-HANDRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
nominal_thread_size0.190 INCHES0.190 INCHES IN
thread_quantity_per_inch3232
material_document_and_classificationAMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-351-5342
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 03A111-3-7 · 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 DIRECTION: RIGHT-HANDRIGHT-HAND
•
NUT STYLE: ANCHORANCHOR
•
DISTANCE FROM BASE TO CENTER OF APERTURE: 0.281 INCHES MAXIMUM0.281 INCHES MAXIMUM IN
•
THREAD CLASS: 3B3B
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: IRON ALLOY 660 OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
NUT STYLEANCHORANCHOR
DISTANCE FROM BASE TO CENTER OF APERTURE0.281 INCHES MAXIMUM0.281 INCHES MAXIMUM IN
THREAD CLASS3B3B
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALIRON ALLOY 660 OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NOMINAL THREAD SIZE0.190 INCHES0.190 INCHES IN
THREAD QUANTITY PER INCH3232
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
ERM4330Interchangeable
interchangeable cross-reference
interchangeable
250737Interchangeable
interchangeable cross-reference
interchangeable
2507-3-5Interchangeable
interchangeable cross-reference
interchangeable
13100009-5Interchangeable
interchangeable cross-reference
interchangeable
NGN512NN-3-5Interchangeable
interchangeable cross-reference
interchangeable
NS203674-3-6Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 03A111-3-7?
03A111-3-7 is a NUT,CLIP-ON.
What parts can replace 03A111-3-7?
There are 12 known substitutes for 03A111-3-7: ERM4330, 250737, 2507-3-5 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 03A111-3-7?
03A111-3-7 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-351-5342. 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