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127B-A4-12 — WASHER,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

127B-A4-12: WASHER,LOCK.

The WASHER,LOCK is a the manufacturer industrial component. Key specifications include hole_diameter: 12.2 MILLIMETERS NOMINAL MM, style_designator: SPLIT HELICAL-RIGHT HAND, material_thickness: 2.5 MILLIMETERS NOMINAL MM, end_item_identification: 7386293(53711) ENGINE ASSY, part_name_assigned_by_controlling_agency: (INAVY)WASHER. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-560-0269, 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
127B-A4-12
NSN: 5310-01-560-0269
FSC: 5310 — Nuts and Washers
CAGE: 15526 — METRIC AND MULTISTANDARD COMPONENTS CORP (USA)
SPECIFICATIONS
hole_diameter12.2 MILLIMETERS NOMINAL MM
style_designatorSPLIT HELICAL-RIGHT HAND
material_thickness2.5 MILLIMETERS NOMINAL MM
end_item_identification7386293(53711) ENGINE ASSY
part_name_assigned_by_controlling_agency(INAVY)WASHER
NSN5310-01-560-0269
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 127B-A4-12 · 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
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
•
MATERIAL THICKNESS: 2.5 MILLIMETERS NOMINAL MM
•
HOLE DIAMETER: 12.2 MILLIMETERS NOMINAL MM
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
MATERIAL THICKNESS2.5 MILLIMETERS NOMINAL MM
PART NAME ASSIGNED BY CONTROLLING AGENCY(INAVY)WASHER
END ITEM IDENTIFICATION7386293(53711) ENGINE ASSY
HOLE DIAMETER12.2 MILLIMETERS NOMINAL MM
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 1
127B-A4M12Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 127B-A4-12?
127B-A4-12 is a WASHER,LOCK.
What parts can replace 127B-A4-12?
There is 1 known substitute for 127B-A4-12: 127B-A4M12. Substitute compatibility should be verified for your specific system.
What is the NSN for 127B-A4-12?
127B-A4-12 is cataloged in the U.S. Government catalog under NSN 5310-01-560-0269. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.