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Technical Data Sheet
PartsTable / COMPONENT / MB1283PC4
MB1283PC4 ✓ 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,KEY is a the manufacturer industrial component. Key specifications include hole_diameter: 5.582 INCHES MINIMUM AND 5.617 INCHES MAXIMUM IN, hardness_rating: 50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM, outside_diameter: 6.531 INCHES MINIMUM AND 6.576 INCHES MAXIMUM IN, style_designator: KEY, material_thickness: 0.118 INCHES MINIMUM AND 0.132 INCHES MAXIMUM IN, external_key_quantity: 19. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-186-0984, 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
MB1283PC4
NSN: 5310-00-186-0984
FSC: 5310
CAGE: 20263 — MKT GEOTECHNICAL SYSTEMS (USA)
SPECIFICATIONS
hole_diameter5.582 INCHES MINIMUM AND 5.617 INCHES MAXIMUM IN
hardness_rating50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
outside_diameter6.531 INCHES MINIMUM AND 6.576 INCHES MAXIMUM IN
style_designatorKEY
material_thickness0.118 INCHES MINIMUM AND 0.132 INCHES MAXIMUM IN
external_key_quantity19
external_prebent_key_width0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
internal_prebent_key_width0.500 INCHES MINIMUM AND 0.590 INCHES MAXIMUM IN
internal_prebent_key_length0.250 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
overall_distance_including_keys7.438 INCHES MAXIMUM IN
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
NSN5310-00-186-0984
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MB1283PC4 · 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
•
EXTERNAL KEY QUANTITY: 19
•
OUTSIDE DIAMETER: 6.531 INCHES MINIMUM AND 6.576 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
MATERIAL: STEEL COMP 1005 OR STEEL COMP 1006 OR STEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1018 OR STEEL COMP 1025 OR STEEL COMP 1030 OR STEEL COMP 1035 OVERALL
•
EXTERNAL PREBENT KEY WIDTH: 0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
•
OVERALL DISTANCE INCLUDING KEYS: 7.438 INCHES MAXIMUM IN
•
HARDNESS RATING: 50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
TECHNICAL CHARACTERISTICS (FLIS)
EXTERNAL KEY QUANTITY19
OUTSIDE DIAMETER6.531 INCHES MINIMUM AND 6.576 INCHES MAXIMUM IN
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
MATERIALSTEEL COMP 1005 OR STEEL COMP 1006 OR STEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1018 OR STEEL COMP 1025 OR STEEL COMP 1030 OR STEEL COMP 1035 OVERALL
EXTERNAL PREBENT KEY WIDTH0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS7.438 INCHES MAXIMUM IN
HARDNESS RATING50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
MATERIAL THICKNESS0.118 INCHES MINIMUM AND 0.132 INCHES MAXIMUM IN
HOLE DIAMETER5.582 INCHES MINIMUM AND 5.617 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
S16073Interchangeable
interchangeable cross-reference
interchangeable
SRB305SInterchangeable
interchangeable cross-reference
interchangeable
1B4115Interchangeable
interchangeable cross-reference
interchangeable
W28Interchangeable
interchangeable cross-reference
interchangeable
BS5-1451PC30Interchangeable
interchangeable cross-reference
interchangeable
BS5-1559PC30Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MB1283PC4?
MB1283PC4 is a WASHER,KEY.
What parts can replace MB1283PC4?
There are 18 known substitutes for MB1283PC4: S16073, SRB305S, 1B4115 and 15 more. Substitute compatibility should be verified for your specific system.
Is MB1283PC4 still available?
MB1283PC4 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026