PartsTable
Technical Data Sheet
P581 ✓ 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 COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL BODY, leg_length: 0.562 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN, nut_height: 0.875 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNF, overall_length: 2.312 INCHES MINIMUM AND 2.438 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-050-3335, 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
P581
NSN: 5310-00-050-3335
FSC: 5310
CAGE: 22888 — FMC CORP (USA)
SPECIFICATIONS
materialSTEEL BODY
leg_length0.562 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
nut_height0.875 INCHES NOMINAL IN
thread_class3B
thread_seriesUNF
overall_length2.312 INCHES MINIMUM AND 2.438 INCHES MAXIMUM IN
connection_typeTHREADED EXTERNAL PIPE FIRST FLUID END CONNECTION
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
connection_stylePLAIN ALL ENDS
style_designatorMALE COUPLING HALF
thread_directionRIGHT-HAND
features_providedSELF-SEALING
NSN5310-00-050-3335
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: P581 · 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
LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT
NOMINAL THREAD SIZE: 0.750 INCHES IN
THREAD QUANTITY PER INCH: 16
THREAD SERIES: UNF
THREAD CLASS: 3B
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633-CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL
WIDTH ACROSS FLATS: 1.063 INCHES NOMINAL IN
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
LOCKING FEATUREPREVAILING TORQUE WITH NONMETALLIC INSERT
NOMINAL THREAD SIZE0.750 INCHES IN
THREAD QUANTITY PER INCH16
THREAD SERIESUNF
THREAD CLASS3B
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633-CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL
WIDTH ACROSS FLATS1.063 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
THREAD DIRECTIONRIGHT-HAND
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
333Interchangeable
interchangeable cross-reference
interchangeable
149022Interchangeable
interchangeable cross-reference
interchangeable
2X699BInterchangeable
interchangeable cross-reference
interchangeable
PS1-4245-1Interchangeable
interchangeable cross-reference
interchangeable
A-A-59439Interchangeable
interchangeable cross-reference
interchangeable
M4109-13-16-00CInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is P581?
P581 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace P581?
There are 14 known substitutes for P581: 333, 149022, 2X699B and 11 more. Substitute compatibility should be verified for your specific system.
Is P581 still available?
P581 is currently cancelled.
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