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Y5-4 ✓ 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 WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, nut_style: HEXAGON, nut_height: 0.0937 INCHES NOMINAL IN, thread_class: 2B, hole_diameter: 1.094 INCHES NOMINAL IN, thread_series: UNIFIED NATIONAL COARSE (UNC). This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-274-9242, 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
Y5-4
NSN: 5310-00-274-9242
FSC: 5310
CAGE: 03670 — TYCO FIRE PRODUCTS LP (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleHEXAGON
nut_height0.0937 INCHES NOMINAL IN
thread_class2B
hole_diameter1.094 INCHES NOMINAL IN
thread_seriesUNIFIED NATIONAL COARSE (UNC)
outside_diameter1.719 INCHES NOMINAL IN
style_designatorKEY
thread_directionRIGHT-HAND
material_thickness0.093 INCHES NOMINAL IN
width_across_flats0.250 INCHES NOMINAL IN
nominal_thread_size0.112 INCHES IN
NSN5310-00-274-9242
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: Y5-4 · 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
•
OVERALL DISTANCE INCLUDING KEYS: 2.000 INCHES NOMINAL IN
•
EXTERNAL STRAIGHT KEY WIDTH: 0.234 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-750,COMP A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
STYLE DESIGNATOR: KEY
•
MATERIAL THICKNESS: 0.093 INCHES NOMINAL IN
•
EXTERNAL KEY QUANTITY: 2
•
HOLE DIAMETER: 1.094 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 1.719 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL DISTANCE INCLUDING KEYS2.000 INCHES NOMINAL IN
EXTERNAL STRAIGHT KEY WIDTH0.234 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-750,COMP A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
STYLE DESIGNATORKEY
MATERIAL THICKNESS0.093 INCHES NOMINAL IN
EXTERNAL KEY QUANTITY2
HOLE DIAMETER1.094 INCHES NOMINAL IN
OUTSIDE DIAMETER1.719 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
Y-54Interchangeable
interchangeable cross-reference
interchangeable
SH7-3Interchangeable
interchangeable cross-reference
interchangeable
Y8-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is Y5-4?
Y5-4 is a WASHER,KEY.
What parts can replace Y5-4?
There are 3 known substitutes for Y5-4: Y-54, SH7-3, Y8-4. Substitute compatibility should be verified for your specific system.
What is the NSN for Y5-4?
Y5-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-274-9242. 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