Guhring 6511-7.940 RT 100 T Universal 5/16" Extra Long HSS-E Twist Drill
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The Guhring RT 100 T Universal (series 6511) is a premium extra-long HSS-E (cobalt-alloyed high-speed steel) twist drill bit in 7.94 mm (5/16") diameter, made in Germany and distributed under Guhring's ExclusiveLine brand. The "RT 100 T" designation identifies this as a right-hand twist drill from Guhring's versatile Universal series, ground to DIN 1869 extra-long proportions with a black oxide steam-tempered surface treatment for improved corrosion resistance and lubricity. The drill features a standard cylindrical shank (reduced shank is not indicated), 118° point angle typical for this series, and is engineered for drilling steel, cast iron, aluminum, and non-ferrous metals across a wide range of materials — consistent with its "Universal" classification. Internal Guhring catalog number 6511-7.940 and item number 23944323 confirm this is a new, individually packaged unit (qty. 1) in the original Guhring clear plastic tube. Compatible with standard drill chucks and collet-style toolholders accepting a cylindrical shank in the 7.94 mm / 5/16" range.
Product Specifications
| Brand | Guhring |
| Series / Product Line | RT 100 T Universal |
| Catalog Number | 6511-7.940 |
| Item Number | 23944323 |
| Drill Diameter (Metric) | 7.94 mm |
| Drill Diameter (Imperial) | 5/16 in |
| Material / Grade | HSS-E (cobalt-alloyed high-speed steel) |
| Surface Treatment | Black oxide (steam tempered) |
| Length Series | Extra Long (DIN 1869) |
| Shank Type | Cylindrical (straight) |
| Cut Direction | Right-hand (RH) |
| Point Angle | 118° |
| Country of Origin | Germany |
| Quantity | 1 pc |
| Condition | New |