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The Black & Decker 390426-00 is a heavy-duty industrial outer flange, also classified as an outer clamp washer or disc nut, designed to secure 7-inch to 9-inch grinding, cutting, and abrasive disks to the drive spindles of high-speed angle grinders. Engineered by Stanley Black & Decker, this forged steel component maintains axial clamping forces under extreme rotational stress and is compatible with various industrial tool brands including DeWALT and Craftsman.
Features
Anti-Slippage Concentric Clamping: Inner recess aligns with spindle diameter to establish zero horizontal runout
Optimized Force Distribution: Large surface area minimizes localized clamping pressures on grinding wheel cores to prevent micro-fractures
Thermal Dissipation Architecture: Forged carbon steel pulls operational heat away from spindle bearings and the abrasive arbor zone
OEM Quality Assurance: Factory-supplied component matched to original gear reduction case balancing profiles
Precision-Ground Flange Landing Face: Provides uniform torque distribution across Type 27 depressed center and Type 1 straight wheels
Heat-Treated Substrate: Rockwell hardness optimized to prevent internal thread stripping during sudden torque spikes or wheel stalls
Corrosion Resistance: Conversion coating protects against moisture, cutting fluids, and concrete dust
Dual-Orientation Compatibility: Reversible hub profile accommodates both thin cutting wheels and thick grinding wheels
Specifications
Manufacturer Part Number (MPN): 390426-00
Global Trade Item Number (GTIN): 0697478110586
Universal Product Code (UPC): 697478110586
Thread Profile: 5/8"-11 TPI (Threads Per Inch) internal threading
