MasterDrive 4B38SD 4-Groove B-Section 3.8in OD SD Bore V-Belt Sheave
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The MasterDrive 4B38SD is a new, 4-groove, B-section classical V-belt sheave designed for use with an SD-style (split taper) bushing, sold here with the bushing hardware bag included as shown. The part number decodes precisely: '4B' indicates four grooves for B-section V-belts (21/32 in. top width, 13/32 in. belt depth), '38' indicates a 3.8-inch pitch diameter, and 'SD' identifies compatibility with the SD QD (Quick Detach) bushing series, which accepts shaft diameters typically ranging from 1/2 in. to 1-7/16 in. depending on bushing selected. Cast from gray iron and finished with a standard gray enamel paint, this sheave is manufactured by MasterDrive (Masterdrive Power Transmission Products) and is suitable for HVAC fans, compressors, pumps, and general industrial machinery requiring B-section belt drives. The three-bolt SD bushing flange pattern and two set-screw ports visible on the hub face are consistent with standard QD bushing mounting practice; the SD bushing itself is not included — only the sheave and fastener hardware bag are present.
Product Specifications
| Manufacturer | MasterDrive (Masterdrive Power Transmission Products) |
| Part Number | 4B38SD |
| Number of Grooves | 4 |
| Belt Section | B-Section (Classical V-Belt) |
| Pitch Diameter | 3.8 in |
| Bushing Type | SD QD (Quick Detach) Split Taper |
| Bushing Included | No — bushing sold separately |
| Hardware Included | Yes — fastener/bolt hardware bag included |
| Material | Gray Cast Iron |
| Finish | Gray Enamel Paint |
| Belt Top Width (B-Section) | 21/32 in (0.656 in) |
| Bushing Bolt Pattern | 3-bolt SD flange |
| Condition | New |