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PartsTable / COMPONENT / 12778
12778 ✓ 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 TRANSFORMER,POWER is a the manufacturer industrial component. Key specifications include shape: FLAT, width: 11.000 INCHES NOMINAL IN, length: 103.250 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING BLADE, thickness: 1.250 INCHES NOMINAL IN, bevel_type: SINGLE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-274-8038, 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
12778
NSN: 5310-00-274-8038
FSC: 5310
CAGE: 13841 — TIFFIN PARTS, L.L.C. DIV SUBSIDIARY OF PETTIBONE CORP. (USA)
SPECIFICATIONS
shapeFLAT
width11.000 INCHES NOMINAL IN
length103.250 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING BLADE
quantity6
thickness1.250 INCHES NOMINAL IN
bevel_typeSINGLE
body_stylePLAIN, SOLID
scale_namePRESSURE
body_length1.000 INCHES MAXIMUM IN
blade_length21.000 MILLIMETERS NOMINAL MM
hole_diameter1.266 INCHES NOMINAL IN
NSN5310-00-274-8038
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12778 · 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: COPPER ALLOY OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
THICKNESS: 0.247 INCHES MINIMUM AND 0.253 INCHES MAXIMUM IN
•
HOLE DIAMETER: 1.266 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OVERALL DIAMETER: 2.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY OVERALL
CENTER HOLE SHAPE STYLEROUND
THICKNESS0.247 INCHES MINIMUM AND 0.253 INCHES MAXIMUM IN
HOLE DIAMETER1.266 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OVERALL DIAMETER2.250 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
12778Interchangeable
interchangeable cross-reference
interchangeable
3715Interchangeable
interchangeable cross-reference
interchangeable
H-954-3Interchangeable
interchangeable cross-reference
interchangeable
PRH-954-3Interchangeable
interchangeable cross-reference
interchangeable
671205Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 12778?
12778 is a TRANSFORMER,POWER.
What parts can replace 12778?
There are 5 known substitutes for 12778: 12778, 3715, H-954-3 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 12778?
12778 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-274-8038. 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