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PartsTable / COMPONENT / A201-4
A201-4 ✓ 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,SHAFT,FLEXIBLE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, body_style: HOLE MOUNTED, bore_shape: STRAIGHT BOTH ENDS, body_length: 0.380 INCHES NOMINAL IN, bore_length: 0.1880 INCHES NOMINAL BOTH ENDS IN, design_type: INSULATOR W/FLEXIBLE ROD ACTION. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-014-5629, 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
A201-4
NSN: 5310-00-014-5629
FSC: 5310
CAGE: 51403 — BENMAR HEATER DIV STACEE MFG INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
body_styleHOLE MOUNTED
bore_shapeSTRAIGHT BOTH ENDS
body_length0.380 INCHES NOMINAL IN
bore_length0.1880 INCHES NOMINAL BOTH ENDS IN
design_typeINSULATOR W/FLEXIBLE ROD ACTION
recess_depth0.088 INCHES NOMINAL IN
body_diameter0.810 INCHES NOMINAL IN
bore_diameter0.1880 INCHES NOMINAL BOTH ENDS IN
hole_diameter0.172 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
actuator_styleROUND, FLUSH
inclosure_typeFULLY INCLOSED
NSN5310-00-014-5629
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A201-4 · 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
•
RECESS DEPTH: 0.088 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 2.138 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.172 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.037 INCHES NOMINAL IN
•
STYLE DESIGNATOR: RECESSED
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL HEIGHT0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
RECESS DEPTH0.088 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER2.138 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
HOLE DIAMETER0.172 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
MATERIAL THICKNESS0.037 INCHES NOMINAL IN
STYLE DESIGNATORRECESSED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
QS200M68WInterchangeable
interchangeable cross-reference
interchangeable
7048624Interchangeable
interchangeable cross-reference
interchangeable
4730002782480Interchangeable
interchangeable cross-reference
interchangeable
20068Interchangeable
interchangeable cross-reference
interchangeable
5226094Interchangeable
interchangeable cross-reference
interchangeable
379Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A201-4?
A201-4 is a COUPLING,SHAFT,FLEXIBLE.
What parts can replace A201-4?
There are 15 known substitutes for A201-4: QS200M68W, 7048624, 4730002782480 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A201-4?
A201-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-014-5629. 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