PartsTable
Technical Data Sheet
9131M74P31 ✓ 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,PLAIN,EXTENDED WASHER,HEXAGO. 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 part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-296-0633, 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
9131M74P31
NSN: 5310-01-296-0633
FSC: 5310
CAGE: 07482 — GENERAL ELECTRIC COMPANY (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
washer_outside_diameter0.325 INCHES MAXIMUM IN
thread_quantity_per_inch32
NSN5310-01-296-0633
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 9131M74P31 · 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: 0.243 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH: 32
MATERIAL: IRON ALLOY 660 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
WASHER THICKNESS: 0.020 INCHES NOMINAL IN
NUT STYLE: CASTELLATED HEXAGON
THREAD CLASS: 3B
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.243 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN
OVERALL HEIGHT0.172 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH32
MATERIALIRON ALLOY 660 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
WASHER THICKNESS0.020 INCHES NOMINAL IN
NUT STYLECASTELLATED HEXAGON
THREAD CLASS3B
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
5509420G7Interchangeable
interchangeable cross-reference
interchangeable
5768Interchangeable
interchangeable cross-reference
interchangeable
DMS 81005BInterchangeable
interchangeable cross-reference
interchangeable
MIL-E-1/1075Interchangeable
interchangeable cross-reference
interchangeable
B7406912Interchangeable
interchangeable cross-reference
interchangeable
7406912Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 9131M74P31?
9131M74P31 is a NUT,PLAIN,EXTENDED WASHER,HEXAGO.
What parts can replace 9131M74P31?
There are 10 known substitutes for 9131M74P31: 5509420G7, 5768, DMS 81005B and 7 more. Substitute compatibility should be verified for your specific system.
Is 9131M74P31 still available?
9131M74P31 is currently cancelled.
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