APT BHR8D Boring Head w/ Integrated R-8 Shank New
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The APT (American Precision Tools) BHR8D is a new, USA-made adjustable boring head with an integrated R-8 shank, designed for use in Bridgeport-style knee mills and other milling machines that accept the R-8 spindle taper. The head body features a knurled adjustment ring with a graduated micrometer-style dial for precise boring diameter adjustment, two offset boring bar clamping holes visible on the front face for accepting standard boring bars, and a smooth cylindrical shank ground to R-8 taper specifications. As confirmed by the label, APT designates this as part number BHR8D — "BHR" indicating Boring Head with R-8 integrated shank, and "8D" referencing the body series/size — manufactured by APT Carbide Tools to accept industry-standard boring bar shanks. This is new old stock, still in original manufacturer packaging.
Product Specifications
| Brand | APT (American Precision Tools) |
| MPN | BHR8D |
| Shank Type | R-8 Integrated |
| Country of Manufacture | USA |
| Condition | New |
| Compatible Spindle | R-8 (Bridgeport-style milling machines) |
| Adjustment Style | Micrometer dial graduated ring |
| Body Finish | Black oxide |
| Boring Bar Holes | 2 |