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PartsTable / COMPONENT / 12H49-A
12H49-A ✓ 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 thickness: 0.250 INCHES NOMINAL IN, hole_diameter: 6.000 INCHES MINIMUM AND 6.015 INCHES MAXIMUM IN, special_features: CUT 1.625 IN. BY 45 DEG 4 CORNERS IN, width_across_flats: 10.000 INCHES NOMINAL IN, peripheral_shape_style: OCTAGON, center_hole_shape_style: ROUND.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-186-0683, 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
12H49-A
NSN: 5310-01-186-0683
FSC: 5310
CAGE: 2Y614 — LINK-BELT CRANES, L.P., LLLP (USA)
SPECIFICATIONS
thickness0.250 INCHES NOMINAL IN
hole_diameter6.000 INCHES MINIMUM AND 6.015 INCHES MAXIMUM IN
special_featuresCUT 1.625 IN. BY 45 DEG 4 CORNERS IN
width_across_flats10.000 INCHES NOMINAL IN
peripheral_shape_styleOCTAGON
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-01-186-0683
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12H49-A · 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
•
THICKNESS: 0.250 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
HOLE DIAMETER: 6.000 INCHES MINIMUM AND 6.015 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 10.000 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: OCTAGON
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
THICKNESS0.250 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
HOLE DIAMETER6.000 INCHES MINIMUM AND 6.015 INCHES MAXIMUM IN
WIDTH ACROSS FLATS10.000 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEOCTAGON
CENTER HOLE SHAPE STYLEROUND
SPECIAL FEATURESCUT 1.625 IN. BY 45 DEG 4 CORNERS IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
12-H-0049Interchangeable
interchangeable cross-reference
interchangeable
755002A7767-1Interchangeable
interchangeable cross-reference
interchangeable
12-4-49Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 12H49-A?
12H49-A is a WASHER,FLAT.
What parts can replace 12H49-A?
There are 3 known substitutes for 12H49-A: 12-H-0049, 755002A7767-1, 12-4-49. Substitute compatibility should be verified for your specific system.
What is the NSN for 12H49-A?
12H49-A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-186-0683. 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