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31566 ✓ 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 TERMINAL,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include phase: SINGLE, material: COPPER ALLOY, nut_style: HEXAGON, pad_shape: CIRCULAR, nut_height: 0.340 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN, control_type: THERMOSTAT. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-021-8582, 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
31566
NSN: 5310-00-021-8582
FSC: 5310
CAGE: 13841 — TIFFIN PARTS, L.L.C. DIV SUBSIDIARY OF PETTIBONE CORP. (USA)
SPECIFICATIONS
phaseSINGLE
materialCOPPER ALLOY
nut_styleHEXAGON
pad_shapeCIRCULAR
nut_height0.340 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
control_typeTHERMOSTAT
current_typeAC
inside_depth17.500 INCHES NOMINAL IN
inside_width12.000 INCHES NOMINAL IN
power_rating1.6 KILOWATTS MAXIMUM
thread_class2B
water_jacketNOT PROVIDED
NSN5310-00-021-8582
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 31566 · 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
•
THREAD CLASS: 2B
•
WIDTH ACROSS FLATS: 0.7280 INCHES MINIMUM AND 0.7500 INCHES MAXIMUM IN
•
THREAD SERIES: UNF
•
THREAD QUANTITY PER INCH: 20
•
NOMINAL THREAD SIZE: 0.438 INCHES IN
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
NONDEFINITIVE SPEC/STD DATA: A TYPE
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
WIDTH ACROSS FLATS0.7280 INCHES MINIMUM AND 0.7500 INCHES MAXIMUM IN
THREAD SERIESUNF
THREAD QUANTITY PER INCH20
NOMINAL THREAD SIZE0.438 INCHES IN
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
NONDEFINITIVE SPEC/STD DATAA TYPE
MATERIALSTEEL OVERALL
NUT HEIGHT0.340 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
100658Interchangeable
interchangeable cross-reference
interchangeable
FFS92Interchangeable
interchangeable cross-reference
interchangeable
4204Interchangeable
interchangeable cross-reference
interchangeable
RHS25KInterchangeable
interchangeable cross-reference
interchangeable
4030Interchangeable
interchangeable cross-reference
interchangeable
4619Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 31566?
31566 is a TERMINAL,QUICK DISCONNECT.
What parts can replace 31566?
There are 25 known substitutes for 31566: 100658, FFS92, 4204 and 22 more. Substitute compatibility should be verified for your specific system.
Is 31566 still available?
31566 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