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R11739 ✓ 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,FLAT is a the manufacturer industrial component. Key specifications include material: IRON OVERALL, thickness: 0.500 INCHES NOMINAL IN, hole_diameter: 2.255 INCHES MINIMUM AND 2.257 INCHES MAXIMUM IN, overall_diameter: 6.000 INCHES NOMINAL IN, center_hole_width: 1.881 INCHES MINIMUM AND 1.883 INCHES MAXIMUM IN, peripheral_shape_style: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-430-9442, 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
R11739
NSN: 5310-00-430-9442
FSC: 5310
CAGE: 23926 — KOMATSU AMERICA CORPORATION (USA)
SPECIFICATIONS
materialIRON OVERALL
thickness0.500 INCHES NOMINAL IN
hole_diameter2.255 INCHES MINIMUM AND 2.257 INCHES MAXIMUM IN
overall_diameter6.000 INCHES NOMINAL IN
center_hole_width1.881 INCHES MINIMUM AND 1.883 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleDEE
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-430-9442
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: R11739 · 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
•
CENTER HOLE WIDTH: 1.881 INCHES MINIMUM AND 1.883 INCHES MAXIMUM IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
OVERALL DIAMETER: 6.000 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
HOLE DIAMETER: 2.255 INCHES MINIMUM AND 2.257 INCHES MAXIMUM IN
•
MATERIAL: IRON OVERALL
•
CENTER HOLE SHAPE STYLE: DEE
•
THICKNESS: 0.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE WIDTH1.881 INCHES MINIMUM AND 1.883 INCHES MAXIMUM IN
PERIPHERAL SHAPE STYLEROUND
OVERALL DIAMETER6.000 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
HOLE DIAMETER2.255 INCHES MINIMUM AND 2.257 INCHES MAXIMUM IN
MATERIALIRON OVERALL
CENTER HOLE SHAPE STYLEDEE
THICKNESS0.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
11739Interchangeable
interchangeable cross-reference
interchangeable
SCC51707Interchangeable
interchangeable cross-reference
interchangeable
C15651Interchangeable
interchangeable cross-reference
interchangeable
MS35489-21Interchangeable
interchangeable cross-reference
interchangeable
AN931-12-23Interchangeable
interchangeable cross-reference
interchangeable
BS-53787-50Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is R11739?
R11739 is a WASHER,FLAT.
What parts can replace R11739?
There are 6 known substitutes for R11739: 11739, SCC51707, C15651 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for R11739?
R11739 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-430-9442. 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