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Technical Data Sheet
2W19991FA1 ✓ 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,HEXAGON is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 464 OR COPPER ALLOY 485 OVERALL, nut_style: HEXAGON, nut_height: 0.117 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNF, thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-064-3590, 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
2W19991FA1
NSN: 5310-00-064-3590
FSC: 5310
CAGE: 11530 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN INFORMATION SYSTEMS & GLOBAL SOLUTIONS (USA)
SPECIFICATIONS
materialCOPPER ALLOY 464 OR COPPER ALLOY 485 OVERALL
nut_styleHEXAGON
nut_height0.117 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.362 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
nominal_thread_size0.190 INCHES IN
bearing_surface_typeCHAMFERED
thread_quantity_per_inch32
material_document_and_classificationASTM B21 ASSN STD ALL MATERIAL RESPONSES OVERALL
NSN5310-00-064-3590
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2W19991FA1 · 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
WIDTH ACROSS FLATS: 0.362 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
THREAD CLASS: 2B
BEARING SURFACE TYPE: CHAMFERED
NOMINAL THREAD SIZE: 0.190 INCHES IN
THREAD SERIES: UNF
THREAD QUANTITY PER INCH: 32
THREAD DIRECTION: RIGHT-HAND
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.362 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
THREAD CLASS2B
BEARING SURFACE TYPECHAMFERED
NOMINAL THREAD SIZE0.190 INCHES IN
THREAD SERIESUNF
THREAD QUANTITY PER INCH32
THREAD DIRECTIONRIGHT-HAND
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NUT HEIGHT0.117 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM B21 ASSN STD ALL MATERIAL RESPONSES OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
95-6Interchangeable
interchangeable cross-reference
interchangeable
MILE1Interchangeable
interchangeable cross-reference
interchangeable
MS35240-72Interchangeable
interchangeable cross-reference
interchangeable
FFS92Interchangeable
interchangeable cross-reference
interchangeable
4L1706Interchangeable
interchangeable cross-reference
interchangeable
545RT82PInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2W19991FA1?
2W19991FA1 is a NUT,PLAIN,HEXAGON.
What parts can replace 2W19991FA1?
There are 22 known substitutes for 2W19991FA1: 95-6, MILE1, MS35240-72 and 19 more. Substitute compatibility should be verified for your specific system.
Is 2W19991FA1 still available?
2W19991FA1 is currently cancelled.
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