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Technical Data Sheet
PartsTable / COMPONENT / X-1288
X-1288 ✓ 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 SOCKET,SOCKET WRENCH is a the manufacturer industrial component. Key specifications include height: 0.125 INCHES NOMINAL IN, diameter: 0.368 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN, material: STEEL OVERALL, head_style: FLAT, chamfer_length: 0.078 INCHES NOMINAL IN, overall_length: 4.500 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 5315-00-050-5017, 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
X-1288
NSN: 5315-00-050-5017
FSC: 5315
CAGE: 79410 — LIBERTY VENTURES INTI, LLC (USA)
SPECIFICATIONS
height0.125 INCHES NOMINAL IN
diameter0.368 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN
materialSTEEL OVERALL
head_styleFLAT
chamfer_length0.078 INCHES NOMINAL IN
overall_length4.500 INCHES NOMINAL IN
drive_end_shapeSQUARE SINGLE END INTERNAL
special_featuresSTANDARD LENGTH
style_designatorINTERNAL-INTERNAL
features_providedMANUAL TOOL
pin_chamfer_angle15.0 DEGREES NOMINAL
pin_head_diameter0.500 INCHES NOMINAL IN
NSN5315-00-050-5017
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: X-1288 · 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
•
HEIGHT: 0.125 INCHES NOMINAL IN
•
UNDER HEAD LENGTH: 1.125 INCHES NOMINAL IN
•
PIN HEAD DIAMETER: 0.500 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
DIAMETER: 0.368 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN
•
CHAMFER LENGTH: 0.078 INCHES NOMINAL IN
•
HEAD STYLE: FLAT
•
HOLE ARRANGEMENT STYLE: ONE END DRILLED
TECHNICAL CHARACTERISTICS (FLIS)
HEIGHT0.125 INCHES NOMINAL IN
UNDER HEAD LENGTH1.125 INCHES NOMINAL IN
PIN HEAD DIAMETER0.500 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
DIAMETER0.368 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN
CHAMFER LENGTH0.078 INCHES NOMINAL IN
HEAD STYLEFLAT
HOLE ARRANGEMENT STYLEONE END DRILLED
PIN CHAMFER ANGLE15.0 DEGREES NOMINAL
STYLE DESIGNATORSTRAIGHT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
35786Interchangeable
interchangeable cross-reference
interchangeable
12-806Interchangeable
interchangeable cross-reference
interchangeable
125333HInterchangeable
interchangeable cross-reference
interchangeable
7117044Interchangeable
interchangeable cross-reference
interchangeable
7117044-6Interchangeable
interchangeable cross-reference
interchangeable
505-017Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is X-1288?
X-1288 is a SOCKET,SOCKET WRENCH.
What parts can replace X-1288?
There are 16 known substitutes for X-1288: 35786, 12-806, 125333H and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for X-1288?
X-1288 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-050-5017. 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