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PartsTable / COMPONENT / 5278618
5278618 ✓ 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 PIN,STRAIGHT,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, first_end_style: CHAMFERED, hardness_rating: 55.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM OVERALL, features_provided: CASEHARDENED, pin_overall_length: 4.625 INCHES NOMINAL IN, first_hole_diameter: 0.219 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-527-8618, 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
5278618
NSN: 5315-00-527-8618
FSC: 5315
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL OVERALL
first_end_styleCHAMFERED
hardness_rating55.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM OVERALL
features_providedCASEHARDENED
pin_overall_length4.625 INCHES NOMINAL IN
first_hole_diameter0.219 INCHES NOMINAL IN
pin_overall_diameter0.5560 INCHES MINIMUM AND 0.5590 INCHES MAXIMUM IN
second_hole_diameter0.219 INCHES NOMINAL IN
first_end_taper_angle45.0 DEGREES NOMINAL
first_end_taper_length0.031 INCHES NOMINAL IN
hole_arrangement_styleBOTH END DRILLED
second_end_relationship_with_first_endIDENTICAL
NSN5315-00-527-8618
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 5278618 · 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
•
FIRST END STYLE: CHAMFERED
•
DISTANCE FROM CENTERLINE OF HOLE TO END OF PIN: 0.250 INCHES NOMINAL IN
•
FEATURES PROVIDED: CASEHARDENED
•
PIN OVERALL DIAMETER: 0.5560 INCHES MINIMUM AND 0.5590 INCHES MAXIMUM IN
•
SECOND END RELATIONSHIP WITH FIRST END: IDENTICAL
•
PIN OVERALL LENGTH: 4.625 INCHES NOMINAL IN
•
FIRST HOLE DIAMETER: 0.219 INCHES NOMINAL IN
•
CENTER TO CENTER DISTANCE BETWEEN HOLES: 4.125 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
FIRST END STYLECHAMFERED
DISTANCE FROM CENTERLINE OF HOLE TO END OF PIN0.250 INCHES NOMINAL IN
FEATURES PROVIDEDCASEHARDENED
PIN OVERALL DIAMETER0.5560 INCHES MINIMUM AND 0.5590 INCHES MAXIMUM IN
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
PIN OVERALL LENGTH4.625 INCHES NOMINAL IN
FIRST HOLE DIAMETER0.219 INCHES NOMINAL IN
CENTER TO CENTER DISTANCE BETWEEN HOLES4.125 INCHES NOMINAL IN
HOLE ARRANGEMENT STYLEBOTH END DRILLED
HARDNESS RATING55.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 1
MT 3075-6Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5278618?
5278618 is a PIN,STRAIGHT,HEADLESS.
What parts can replace 5278618?
There is 1 known substitute for 5278618: MT 3075-6. Substitute compatibility should be verified for your specific system.
What is the NSN for 5278618?
5278618 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-527-8618. 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