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Technical Data Sheet
PartsTable / COMPONENT / BACW10AU3
BACW10AU3 ✓ 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,CONCAVE is a the manufacturer industrial component. Key specifications include radius: 0.235 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN, material: STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 4130 OR STEEL COMP 4027 OVERALL, recess_depth: 0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN, hole_diameter: 0.252 INCHES MINIMUM AND 0.258 INCHES MAXIMUM IN, heat_treatment: AS FABRICATED, surface_finish: 63.0 MICROINCHES COUNTERBORE WALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-083-9303, 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
BACW10AU3
NSN: 5310-00-083-9303
FSC: 5310
CAGE: 81205 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
radius0.235 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN
materialSTEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 4130 OR STEEL COMP 4027 OVERALL
recess_depth0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
hole_diameter0.252 INCHES MINIMUM AND 0.258 INCHES MAXIMUM IN
heat_treatmentAS FABRICATED
surface_finish63.0 MICROINCHES COUNTERBORE WALL
hardness_rating38.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
outside_diameter0.375 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
style_designatorCONCAVE
surface_treatmentCADMIUM AND CHROMATE OVERALL
material_thickness0.078 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN
end_item_identificationKC-46 AIRCRAFT
NSN5310-00-083-9303
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: BACW10AU3 · 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
•
RADIUS: 0.235 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.375 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: CONCAVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-18729 MIL SPEC 3RD MATERIAL RESPONSE OR ASTM A322 ASSN STD 4TH MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
HEAT TREATMENT: AS FABRICATED
•
HARDNESS RATING: 38.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
•
SPECIFICATION/STANDARD DATA: 81205-BACW10AU MANUFACTURERS STANDARD
TECHNICAL CHARACTERISTICS (FLIS)
RADIUS0.235 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.375 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
STYLE DESIGNATORCONCAVE
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-18729 MIL SPEC 3RD MATERIAL RESPONSE OR ASTM A322 ASSN STD 4TH MATERIAL RESPONSE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
HEAT TREATMENTAS FABRICATED
HARDNESS RATING38.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
SPECIFICATION/STANDARD DATA81205-BACW10AU MANUFACTURERS STANDARD
MATERIAL THICKNESS0.078 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN
HOLE DIAMETER0.252 INCHES MINIMUM AND 0.258 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
60-7-30Interchangeable
interchangeable cross-reference
interchangeable
FFB571ANDCLASSCInterchangeable
interchangeable cross-reference
interchangeable
275128Interchangeable
interchangeable cross-reference
interchangeable
49476Interchangeable
interchangeable cross-reference
interchangeable
0S1875Interchangeable
interchangeable cross-reference
interchangeable
PA5368Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BACW10AU3?
BACW10AU3 is a WASHER,CONCAVE.
What parts can replace BACW10AU3?
There are 22 known substitutes for BACW10AU3: 60-7-30, FFB571ANDCLASSC, 275128 and 19 more. Substitute compatibility should be verified for your specific system.
What is the NSN for BACW10AU3?
BACW10AU3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-083-9303. 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