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Technical Data Sheet
PartsTable / COMPONENT / 8B1056
8B1056 ✓ 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 GEAR CLUSTER is a the manufacturer industrial component. Key specifications include height: 0.250 INCHES NOMINAL IN, diameter: 0.746 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN, material: STEEL COMP 1115 OVERALL, head_style: FLAT, chamfer_length: 0.101 INCHES NOMINAL IN, style_designator: STRAIGHT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-276-3666, 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
8B1056
NSN: 5315-00-276-3666
FSC: 5315
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
height0.250 INCHES NOMINAL IN
diameter0.746 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN
materialSTEEL COMP 1115 OVERALL
head_styleFLAT
chamfer_length0.101 INCHES NOMINAL IN
style_designatorSTRAIGHT
pin_chamfer_angle25.0 DEGREES NOMINAL
pin_head_diameter0.938 INCHES NOMINAL IN
under_head_length2.047 INCHES NOMINAL IN
first_hole_diameter0.204 INCHES NOMINAL IN
hole_arrangement_styleONE END DRILLED
distance_from_centerline_of_hole_to_end_of_pin0.297 INCHES NOMINAL IN
NSN5315-00-276-3666
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 8B1056 · 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
•
PIN HEAD DIAMETER: 0.938 INCHES NOMINAL IN
•
HEIGHT: 0.250 INCHES NOMINAL IN
•
DIAMETER: 0.746 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN
•
HOLE ARRANGEMENT STYLE: ONE END DRILLED
•
UNDER HEAD LENGTH: 2.047 INCHES NOMINAL IN
•
CHAMFER LENGTH: 0.101 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT
•
FIRST HOLE DIAMETER: 0.204 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
PIN HEAD DIAMETER0.938 INCHES NOMINAL IN
HEIGHT0.250 INCHES NOMINAL IN
DIAMETER0.746 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN
HOLE ARRANGEMENT STYLEONE END DRILLED
UNDER HEAD LENGTH2.047 INCHES NOMINAL IN
CHAMFER LENGTH0.101 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT
FIRST HOLE DIAMETER0.204 INCHES NOMINAL IN
PIN CHAMFER ANGLE25.0 DEGREES NOMINAL
HEAD STYLEFLAT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
12152WInterchangeable
interchangeable cross-reference
interchangeable
D535Interchangeable
interchangeable cross-reference
interchangeable
639229Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 8B1056?
8B1056 is a GEAR CLUSTER.
What parts can replace 8B1056?
There are 3 known substitutes for 8B1056: 12152W, D535, 639229. Substitute compatibility should be verified for your specific system.
What is the NSN for 8B1056?
8B1056 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-276-3666. 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