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Technical Data Sheet
PartsTable / COMPONENT / 81631
81631 ✓ 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 HOIST ASSEMBLY is a the manufacturer industrial component. Key specifications include height: 0.180 INCHES NOMINAL IN, diameter: 0.121 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN, material: STEEL COMP 4340 OVERALL, head_style: DEE, undercut_width: 0.080 INCHES NOMINAL IN, first_end_style: SQUARE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-787-2166, 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
81631
NSN: 5315-00-787-2166
FSC: 5315
CAGE: 02121 — GOODRICH AEROSPACE CANADA LTD (CAN)
SPECIFICATIONS
height0.180 INCHES NOMINAL IN
diameter0.121 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
materialSTEEL COMP 4340 OVERALL
head_styleDEE
undercut_width0.080 INCHES NOMINAL IN
first_end_styleSQUARE
effective_length0.220 INCHES NOMINAL IN
style_designatorGROOVE
pin_head_diameter0.300 INCHES NOMINAL IN
surface_treatmentCADMIUM OVERALL
under_head_length0.360 INCHES NOMINAL IN
undercut_diameter0.075 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
NSN5315-00-787-2166
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 81631 · 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
•
SURFACE TREATMENT: CADMIUM OVERALL
•
EFFECTIVE LENGTH: 0.220 INCHES NOMINAL IN
•
STYLE DESIGNATOR: GROOVE
•
HEIGHT: 0.180 INCHES NOMINAL IN
•
UNDER HEAD LENGTH: 0.360 INCHES NOMINAL IN
•
UNDERCUT WIDTH: 0.080 INCHES NOMINAL IN
•
FIRST END STYLE: SQUARE
•
HEAD STYLE: DEE
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTCADMIUM OVERALL
EFFECTIVE LENGTH0.220 INCHES NOMINAL IN
STYLE DESIGNATORGROOVE
HEIGHT0.180 INCHES NOMINAL IN
UNDER HEAD LENGTH0.360 INCHES NOMINAL IN
UNDERCUT WIDTH0.080 INCHES NOMINAL IN
FIRST END STYLESQUARE
HEAD STYLEDEE
DIAMETER0.121 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
MATERIALSTEEL COMP 4340 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
85250Interchangeable
interchangeable cross-reference
interchangeable
81631Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 81631?
81631 is a HOIST ASSEMBLY.
What parts can replace 81631?
There are 2 known substitutes for 81631: 85250, 81631. Substitute compatibility should be verified for your specific system.
What is the NSN for 81631?
81631 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-787-2166. 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