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BACW10BW20 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

BACW10BW20: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 2.610 INCHES MINIMUM AND 2.630 INCHES MAXIMUM IN, outside_diameter: 3.240 INCHES MINIMUM AND 3.260 INCHES MAXIMUM IN, special_features: INTERNAL KEYS 180 DEG APART OFFSET 16 DEG 12 MIN FROM CENTER LINE OF EXTERNAL KEYS, style_designator: KEY, material_thickness: 0.046 INCHES MINIMUM AND 0.054 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-920-5440, 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
BACW10BW20
NSN: 5310-00-920-5440
FSC: 5310 — Nuts and Washers
CAGE: 81205 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter2.610 INCHES MINIMUM AND 2.630 INCHES MAXIMUM IN
outside_diameter3.240 INCHES MINIMUM AND 3.260 INCHES MAXIMUM IN
special_featuresINTERNAL KEYS 180 DEG APART OFFSET 16 DEG 12 MIN FROM CENTER LINE OF EXTERNAL KEYS
style_designatorKEY
material_thickness0.046 INCHES MINIMUM AND 0.054 INCHES MAXIMUM IN
external_key_quantity4
internal_key_quantity2
external_straight_key_width0.150 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
internal_straight_key_width0.290 INCHES MINIMUM AND 0.300 INCHES MAXIMUM IN
overall_distance_including_keys3.500 INCHES MINIMUM AND 3.580 INCHES MAXIMUM IN
material_document_and_classificationMIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-920-5440
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: BACW10BW20 · 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
•
INTERNAL STRAIGHT KEY WIDTH: 0.290 INCHES MINIMUM AND 0.300 INCHES MAXIMUM IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 1.090 INCHES MINIMUM AND 1.110 INCHES MAXIMUM IN
•
OVERALL DISTANCE INCLUDING KEYS: 3.500 INCHES MINIMUM AND 3.580 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 3.240 INCHES MINIMUM AND 3.260 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.046 INCHES MINIMUM AND 0.054 INCHES MAXIMUM IN
•
EXTERNAL STRAIGHT KEY WIDTH: 0.150 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
INTERNAL STRAIGHT KEY WIDTH0.290 INCHES MINIMUM AND 0.300 INCHES MAXIMUM IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY1.090 INCHES MINIMUM AND 1.110 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS3.500 INCHES MINIMUM AND 3.580 INCHES MAXIMUM IN
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER3.240 INCHES MINIMUM AND 3.260 INCHES MAXIMUM IN
MATERIAL THICKNESS0.046 INCHES MINIMUM AND 0.054 INCHES MAXIMUM IN
EXTERNAL STRAIGHT KEY WIDTH0.150 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY4
SPECIAL FEATURESINTERNAL KEYS 180 DEG APART OFFSET 16 DEG 12 MIN FROM CENTER LINE OF EXTERNAL KEYS
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
114D6095-1Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 BACW10BW20?
BACW10BW20 is a WASHER,KEY.
What parts can replace BACW10BW20?
There is 1 known substitute for BACW10BW20: 114D6095-1. Substitute compatibility should be verified for your specific system.
What is the NSN for BACW10BW20?
BACW10BW20 is cataloged in the U.S. Government catalog under NSN 5310-00-920-5440. 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.