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Technical Data Sheet
4B5271 ✓ 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: STEEL OVERALL, thickness: 0.064 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN, hole_diameter: 0.433 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN, overall_diameter: 0.993 INCHES MINIMUM AND 1.030 INCHES MAXIMUM IN, special_features: WEAPON SYSTEM ESSENTIAL, surface_treatment: CADMIUM AND CHROMATE OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-514-6962, 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
4B5271
NSN: 5310-00-514-6962
FSC: 5310
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.064 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
hole_diameter0.433 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
overall_diameter0.993 INCHES MINIMUM AND 1.030 INCHES MAXIMUM IN
special_featuresWEAPON SYSTEM ESSENTIAL
surface_treatmentCADMIUM AND CHROMATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationMRAP BUFFALO MK2A2; MRAP - M-ATV DV178; MRAP - M-ATV; MEDIUM MINE PROTECTED VEHICLE - MMPV; ARMORED MULTI-PURPOSE VEHICLE (AMPV); A4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE
cross-sectional_shape_styleRECTANGULAR
nondefinitive_spec/std_dataA TYPE AND 1 GRADE AND A CLASS
criticality_code_justificationFEAT
NSN5310-00-514-6962
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4B5271 · 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 DIAMETER: 1.000 INCHES NOMINAL IN
NONDEFINITIVE SPEC/STD DATA: A TYPE
MATERIAL: STEEL OVERALL
HOLE DIAMETER: 0.438 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLE: ROUND
THICKNESS: 0.078 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL DIAMETER1.000 INCHES NOMINAL IN
NONDEFINITIVE SPEC/STD DATAA TYPE
MATERIALSTEEL OVERALL
HOLE DIAMETER0.438 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
THICKNESS0.078 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
CENTER HOLE SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
MS27183-15Interchangeable
interchangeable cross-reference
interchangeable
AN945-6Interchangeable
interchangeable cross-reference
interchangeable
331967Interchangeable
interchangeable cross-reference
interchangeable
MILW1085TYPEAInterchangeable
Same NIIN cross-reference
interchangeable
619024Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4B5271?
4B5271 is a WASHER,FLAT.
What parts can replace 4B5271?
There are 5 known substitutes for 4B5271: MS27183-15, AN945-6, 331967 and 2 more. Substitute compatibility should be verified for your specific system.
Is 4B5271 still available?
4B5271 is currently cancelled.
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