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440637 ✓ 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,SELF-LOCKING,PLATE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: PLATE, nut_height: 0.171 INCHES MAXIMUM IN, nut_length: 0.682 INCHES MAXIMUM IN, lubrication: DRY FILM LUBRICANT, plate_width: 0.357 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-205-8740, 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
440637
NSN: 5310-00-205-8740
FSC: 5310
CAGE: 82577 — RAYTHEON COMPANY DBA RAYTHEON (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_stylePLATE
nut_height0.171 INCHES MAXIMUM IN
nut_length0.682 INCHES MAXIMUM IN
lubricationDRY FILM LUBRICANT
plate_width0.357 INCHES MAXIMUM IN
temp_rating450.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNJC
locking_featurePREVAILING TORQUE ALL METAL DESIGN
plate_thickness0.140 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
NSN5310-00-205-8740
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 440637 · 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
•
THICKNESS: 0.016 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-766,CLASS 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
OVERALL DIAMETER: 0.266 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL COMP 304 OVERALL
•
HOLE DIAMETER: 0.189 INCHES MINIMUM AND 0.194 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESFLIGHT SAFETY CRITICAL AIRCRAFT PART
THICKNESS0.016 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-766,CLASS 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
CENTER HOLE SHAPE STYLEROUND
OVERALL DIAMETER0.266 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL COMP 304 OVERALL
HOLE DIAMETER0.189 INCHES MINIMUM AND 0.194 INCHES MAXIMUM IN
HARDNESS RATING25.0 ROCKWELL C MINIMUM
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
571037Interchangeable
interchangeable cross-reference
interchangeable
FFS85TYPE2STYLE10PInterchangeable
interchangeable cross-reference
interchangeable
MIL-W-16878/4Interchangeable
interchangeable cross-reference
interchangeable
439-4444-000Interchangeable
interchangeable cross-reference
interchangeable
HP3-EXBHB93Interchangeable
interchangeable cross-reference
interchangeable
HL11VAP-6-7Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 440637?
440637 is a NUT,SELF-LOCKING,PLATE.
What parts can replace 440637?
There are 23 known substitutes for 440637: 571037, FFS85TYPE2STYLE10P, MIL-W-16878/4 and 20 more. Substitute compatibility should be verified for your specific system.
Is 440637 still available?
440637 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026