Segment families and height notation

Both segment tables cover 52–350 mm diameters with a 24 mm segment length. Width rises from 3.5 mm through 4 and 4.5 mm to 5 mm as the diameter rows increase. The normal segment table shows 8+2 mm height, while the roof-shaped table shows 10+2 mm. The source explains that 10+2 means 12 mm total height including a 2 mm welding layer. Confirm the required shape, material and drilling method before choosing between these entries.

Complete drill-bit configuration

The barrel table uses a 1-1/4-inch UNC connection, 400 mm effective length and 470 mm total length for the captured range. Listed thickness is 2 or 2.5 mm, and segment count increases from 5 at 52 mm diameter to 21 at 350 mm. Normal, roof and grooved-turbine shapes are named. Drill-bit arc, segment thickness and curvature can be customized, so an approved drawing should accompany any non-standard order.

The old page attributes bond strength, heat resistance and core removal to the laser-welded design, but publishes no comparative test.

Core-drilling order record

• Material, reinforcement and required hole
• Drill model, spindle and 1-1/4-inch UNC fit
• Diameter, barrel length and segment shape
• Wet/dry method, cooling and core removal
• Hole quality, time and segment-wear record

Keep concrete, asphalt and stone trials separate. Retain the bit label and approved drawing with the first accepted hole so customized arc or segment details are not lost on a repeat order.