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BACW10BW55 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

BACW10BW55: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OR STEEL COMP 4340 OVERALL, hole_diameter: 8.893 INCHES MINIMUM AND 8.973 INCHES MAXIMUM IN, surface_finish: 63.0 MICROINCHES TOP, hardness_rating: 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM, outside_diameter: 9.660 INCHES MINIMUM AND 9.680 INCHES MAXIMUM IN, special_features: INTERNAL KEYS 180.0 DEGREES APART OFFSET 8 DEG 15 MIN 55 SEC FROM CENTER LINE OF EXTERNAL KEYS. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-144-7392, 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
BACW10BW55
NSN: 5310-01-144-7392
FSC: 5310 — Nuts and Washers
CAGE: 77272 — THE BOEING COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OR STEEL COMP 4340 OVERALL
hole_diameter8.893 INCHES MINIMUM AND 8.973 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES TOP
hardness_rating32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM
outside_diameter9.660 INCHES MINIMUM AND 9.680 INCHES MAXIMUM IN
special_featuresINTERNAL KEYS 180.0 DEGREES APART OFFSET 8 DEG 15 MIN 55 SEC FROM CENTER LINE OF EXTERNAL KEYS
style_designatorKEY
surface_treatmentPHOSPHATE OVERALL
material_thickness0.096 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
external_key_quantity4
internal_key_quantity2
external_straight_key_width0.270 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
NSN5310-01-144-7392
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: BACW10BW55 · 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 FINISH: 63.0 MICROINCHES BOTTOM
•
INTERNAL STRAIGHT KEY WIDTH: 0.480 INCHES MINIMUM AND 0.490 INCHES MAXIMUM IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 4.280 INCHES MINIMUM AND 4.300 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: DOD-P-16232,TY Z,CL 4 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
OVERALL DISTANCE INCLUDING KEYS: 10.000 INCHES MINIMUM AND 10.020 INCHES MAXIMUM IN
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM
•
STYLE DESIGNATOR: KEY
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES BOTTOM
SURFACE FINISH63.0 MICROINCHES TOP
INTERNAL STRAIGHT KEY WIDTH0.480 INCHES MINIMUM AND 0.490 INCHES MAXIMUM IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY4.280 INCHES MINIMUM AND 4.300 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONDOD-P-16232,TY Z,CL 4 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
OVERALL DISTANCE INCLUDING KEYS10.000 INCHES MINIMUM AND 10.020 INCHES MAXIMUM IN
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-18729 MIL SPEC 1ST MATERIAL RESPONSE OR AMS 6415 ASSN STD 2ND MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER9.660 INCHES MINIMUM AND 9.680 INCHES MAXIMUM 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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is BACW10BW55?
BACW10BW55 is a WASHER,KEY.
What is the NSN for BACW10BW55?
BACW10BW55 is cataloged in the U.S. Government catalog under NSN 5310-01-144-7392. 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.