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Technical Data Sheet
PartsTable / COMPONENT / AL1256-17
AL1256-17 ✓ 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: 0.022 INCHES MINIMUM AND 0.042 INCHES MAXIMUM IN, hole_diameter: 0.266 INCHES MINIMUM AND 0.276 INCHES MAXIMUM IN, overall_diameter: 0.422 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN, surface_treatment: CADMIUM OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-993-0511, 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
AL1256-17
NSN: 5310-00-993-0511
FSC: 5310
CAGE: 08484 — BREEZE-EASTERN LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.022 INCHES MINIMUM AND 0.042 INCHES MAXIMUM IN
hole_diameter0.266 INCHES MINIMUM AND 0.276 INCHES MAXIMUM IN
overall_diameter0.422 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
surface_treatmentCADMIUM OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
specification/standard_data43999-2W1 MANUFACTURERS STANDARD
material_document_and_classificationQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-993-0511
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: AL1256-17 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL OVERALL
•
SPECIFICATION/STANDARD DATA: 43999-2W1 MANUFACTURERS STANDARD
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: CADMIUM OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.266 INCHES MINIMUM AND 0.276 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL OVERALL
SPECIFICATION/STANDARD DATA43999-2W1 MANUFACTURERS STANDARD
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM OVERALL
PERIPHERAL SHAPE STYLEROUND
HOLE DIAMETER0.266 INCHES MINIMUM AND 0.276 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OVERALL DIAMETER0.422 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
CENTER HOLE SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
3646Interchangeable
interchangeable cross-reference
interchangeable
10288-53Interchangeable
interchangeable cross-reference
interchangeable
MPS3646Interchangeable
interchangeable cross-reference
interchangeable
101000045Interchangeable
interchangeable cross-reference
interchangeable
2W1-17-14-32Interchangeable
interchangeable cross-reference
interchangeable
ASAB27-1-1950MEDIUMSERIESInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AL1256-17?
AL1256-17 is a WASHER,FLAT.
What parts can replace AL1256-17?
There are 15 known substitutes for AL1256-17: 3646, 10288-53, MPS3646 and 12 more. Substitute compatibility should be verified for your specific system.
Is AL1256-17 still available?
AL1256-17 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026