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3-51228-1 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

3-51228-1: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OVERALL, thickness: 0.090 INCHES NOMINAL IN, hole_diameter: 1.125 INCHES NOMINAL IN, overall_diameter: 1.849 INCHES NOMINAL IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-804-9977, 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
3-51228-1
NSN: 5310-00-804-9977
FSC: 5310 — Nuts and Washers
CAGE: 79U29 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OVERALL
thickness0.090 INCHES NOMINAL IN
hole_diameter1.125 INCHES NOMINAL IN
overall_diameter1.849 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleBLANK RECTANGULAR
outside_left_corner_chamfer_angle45.0 DEGREES NOMINAL
material_document_and_classificationMIL-S-6758 MIL SPEC ALL MATERIAL RESPONSES OVERALL
NSN5310-00-804-9977
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 3-51228-1 · 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
•
OUTSIDE LEFT CORNER CHAMFER ANGLE: 45.0 DEGREES NOMINAL
•
OVERALL DIAMETER: 1.849 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6758 MIL SPEC ALL MATERIAL RESPONSES OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: BLANK RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL COMP 4130 OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 1.125 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OUTSIDE LEFT CORNER CHAMFER ANGLE45.0 DEGREES NOMINAL
OVERALL DIAMETER1.849 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6758 MIL SPEC ALL MATERIAL RESPONSES OVERALL
CROSS-SECTIONAL SHAPE STYLEBLANK RECTANGULAR
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL COMP 4130 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER1.125 INCHES NOMINAL IN
THICKNESS0.090 INCHES NOMINAL IN
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3-51228-1?
3-51228-1 is a WASHER,FLAT.
What is the NSN for 3-51228-1?
3-51228-1 is cataloged in the U.S. Government catalog under NSN 5310-00-804-9977. 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.