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N-581 — Technical Data Sheet

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— · 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

VALVE,REGULATING,FLUID PRESSURE. Key specifications include filter: NOT INCLUDED, material: RUBBER CHLOROPRENE CLASS CR FLOW CONTROL DEVICE, nut_style: SLOTTED, HEXAGON, body_style: STRAIGHT THRU, nut_height: 0.438 INCHES NOMINAL IN, thread_class: 2B. This part is cataloged in the Federal Logistics Information System under NSN 5310-00-208-4725, 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
N-581
NSN: 5310-00-208-4725
FSC: 5310
CAGE: 78500 — MERITOR HEAVY VEHICLE SYSTEMS, LLC (USA)
SPECIFICATIONS
filterNOT INCLUDED
materialRUBBER CHLOROPRENE CLASS CR FLOW CONTROL DEVICE
nut_styleSLOTTED, HEXAGON
body_styleSTRAIGHT THRU
nut_height0.438 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
regulation_typeAUTOMATIC SINGLE STAGE
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.750 INCHES NOMINAL IN
flow_control_deviceDISK
NSN5310-00-208-4725
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: N-581 · 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 DIRECTION: RIGHT-HAND
•
THREAD CLASS: 2B
•
THREAD SERIES: UNF
•
BEARING SURFACE TYPE: WASHER FACED
•
THREAD QUANTITY PER INCH: 20
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
WIDTH ACROSS FLATS: 0.750 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2B
THREAD SERIESUNF
BEARING SURFACE TYPEWASHER FACED
THREAD QUANTITY PER INCH20
NOMINAL THREAD SIZE0.500 INCHES IN
WIDTH ACROSS FLATS0.750 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
SURFACE TREATMENTCADMIUM OVERALL
NUT HEIGHT0.438 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
SN54157J-00InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
DM54157JInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
SN54157J10InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
203047InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
YB2310J722InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
30 N581 25TO60PSIInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is N-581?
N-581 is a VALVE,REGULATING,FLUID PRESSURE.
What parts can replace N-581?
There are 6 known substitutes for N-581: SN54157J-00, DM54157J, SN54157J10 and 3 more. Substitute compatibility should be verified for your specific system.
Is N-581 still available?
N-581 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: October 2026