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4M248-1 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

4M248-1: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024 OVERALL, hole_diameter: 0.785 INCHES MINIMUM AND 0.800 INCHES MAXIMUM IN, outside_diameter: 1.200 INCHES NOMINAL IN, surface_treatment: CHROMATE OVERALL, material_thickness: 0.063 INCHES NOMINAL IN, wire_hole_diameter: 0.070 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-184-3786, 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
4M248-1
NSN: 5310-01-184-3786
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024 OVERALL
hole_diameter0.785 INCHES MINIMUM AND 0.800 INCHES MAXIMUM IN
outside_diameter1.200 INCHES NOMINAL IN
surface_treatmentCHROMATE OVERALL
material_thickness0.063 INCHES NOMINAL IN
wire_hole_diameter0.070 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN
tapered_key_minor_width0.120 INCHES NOMINAL IN
overall_distance_including_keys1.470 INCHES MINIMUM AND 1.570 INCHES MAXIMUM IN
material_document_and_classificationQQ-A-250/4,T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-C-5541,TY 2,CL 1A MIL SPEC SINGLE TREATMENT RESPONSE OVERALL A
NSN5310-01-184-3786
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4M248-1 · 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
•
WIRE HOLE DIAMETER: 0.070 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-5541,TY 2,CL 1A MIL SPEC SINGLE TREATMENT RESPONSE OVERALL A
•
OVERALL DISTANCE INCLUDING KEYS: 1.470 INCHES MINIMUM AND 1.570 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-250/4,T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 1.200 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.063 INCHES NOMINAL IN
•
TAPERED KEY MINOR WIDTH: 0.120 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIRE HOLE DIAMETER0.070 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-5541,TY 2,CL 1A MIL SPEC SINGLE TREATMENT RESPONSE OVERALL A
OVERALL DISTANCE INCLUDING KEYS1.470 INCHES MINIMUM AND 1.570 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/4,T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER1.200 INCHES NOMINAL IN
MATERIAL THICKNESS0.063 INCHES NOMINAL IN
TAPERED KEY MINOR WIDTH0.120 INCHES NOMINAL IN
SPECIAL FEATURESDISTANCE FROM WIRE HOLE CENTER TO END OF TAPERED KEY 0.060 IN.; DISTANCE FROM WIRE HOLE CENTER TO TOP OF TAPERED PREBENT KEY 0.120 IN.; TAPERED KEY PREBENT 30 DEG MIN,40 DEG MAX; HOLE WIDTH ACROSS FLATS 0.655 IN. MIN,0.670 IN. MAX; DISTANCE FROM CENTERLINE TO FLATTED BOTTOM OF WASHER 0.485 IN. MIN,0.515 IN. MAX; DISTANCE FROM BOTTOM OF WASHER TO INSIDE OF PREBENT KEY 1.160 IN. IN
SURFACE TREATMENTCHROMATE OVERALL
MATERIALALUMINUM ALLOY 2024 OVERALL
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
M4248-1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 4M248-1?
4M248-1 is a WASHER,KEY.
What parts can replace 4M248-1?
There is 1 known substitute for 4M248-1: M4248-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 4M248-1?
4M248-1 is cataloged in the U.S. Government catalog under NSN 5310-01-184-3786. 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.