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Technical Data Sheet
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BMC103 ✓ 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 material: STEEL COMP 416F OVERALL, thickness: 0.045 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN, hole_diameter: 0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN, heat_treatment: AS FABRICATED, hardness_rating: 26.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM, overall_diameter: 0.300 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-475-3950, 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
BMC103
NSN: 5310-00-475-3950
FSC: 5310
CAGE: 13796 — BAKER MACHINE CO (USA)
SPECIFICATIONS
materialSTEEL COMP 416F OVERALL
thickness0.045 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN
hole_diameter0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
heat_treatmentAS FABRICATED
hardness_rating26.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
overall_diameter0.300 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
surface_treatmentOXIDE FILM OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationAMS5610 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-475-3950
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: BMC103 · 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
•
SURFACE TREATMENT: OXIDE FILM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5610 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THICKNESS: 0.045 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN
•
CENTER HOLE SHAPE STYLE: ROUND
•
PERIPHERAL SHAPE STYLE: ROUND
•
OVERALL DIAMETER: 0.300 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
HOLE DIAMETER: 0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTOXIDE FILM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5610 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THICKNESS0.045 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN
CENTER HOLE SHAPE STYLEROUND
PERIPHERAL SHAPE STYLEROUND
OVERALL DIAMETER0.300 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
HOLE DIAMETER0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
HEAT TREATMENTAS FABRICATED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
48245Interchangeable
interchangeable cross-reference
interchangeable
77R3LR1JInterchangeable
interchangeable cross-reference
interchangeable
77R3LR1MILL6085AInterchangeable
interchangeable cross-reference
interchangeable
48015Interchangeable
interchangeable cross-reference
interchangeable
486937C1Interchangeable
interchangeable cross-reference
interchangeable
641E7631Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BMC103?
BMC103 is a WASHER,FLAT.
What parts can replace BMC103?
There are 8 known substitutes for BMC103: 48245, 77R3LR1J, 77R3LR1MILL6085A and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for BMC103?
BMC103 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-475-3950. 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