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PartsTable / COMPONENT / 117-31923
117-31923 ✓ 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,ENGINE MOUNT TO is a the manufacturer industrial component. Key specifications include color: BLACK, LUSTERLESS, overall_depth: 0.520 INCHES MINIMUM IN, inside_diameter: 0.252 INCHES MINIMUM AND 0.254 INCHES MAXIMUM IN, outside_diameter: 0.890 INCHES MINIMUM AND 0.930 INCHES MAXIMUM IN, screw_drive_type: HEXAGON SOCKET, style_designator: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-122-5799, 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
117-31923
NSN: 5310-00-122-5799
FSC: 5310
CAGE: 43999 — THE BOEING COMPANY DIV LEGACY AM&M (USA)
SPECIFICATIONS
colorBLACK, LUSTERLESS
overall_depth0.520 INCHES MINIMUM IN
inside_diameter0.252 INCHES MINIMUM AND 0.254 INCHES MAXIMUM IN
outside_diameter0.890 INCHES MINIMUM AND 0.930 INCHES MAXIMUM IN
screw_drive_typeHEXAGON SOCKET
style_designatorROUND
attachment_methodSETSCREWS
counterbore_depth0.114 INCHES MINIMUM IN
overall_thickness0.760 INCHES MINIMUM AND 0.820 INCHES MAXIMUM IN
nominal_thread_size0.164 INCHES SCREW HOLE IN
counterbore_diameter0.640 INCHES MINIMUM IN
material_transparencyOPAQUE
NSN5310-00-122-5799
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 117-31923 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
4147600-50Interchangeable
interchangeable cross-reference
interchangeable
2N2BInterchangeable
interchangeable cross-reference
interchangeable
KMS9N2LNRInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 117-31923?
117-31923 is a NUT,ENGINE MOUNT TO.
What parts can replace 117-31923?
There are 3 known substitutes for 117-31923: 4147600-50, 2N2B, KMS9N2LNR. Substitute compatibility should be verified for your specific system.
What is the NSN for 117-31923?
117-31923 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-122-5799. 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