Metric Series Ball Nose Finishing Mills
Dapra Corporation is now offering a series of high-performance METRIC SERIES Ball Nose Cutters and Inserts in the most commonly used sizes and styles. Contact Dapra today for pricing on these metric sizes. Click here for our standard Ball Nose product line.
- Geometry and coatings produce superior surface finishes
- Excellent tool life reduces or eliminates costly bench work
- Ideal for unattended contour finishing applications
- High-speed runs reduce cycle time by 50%
- Precision-ground inserts achieve closer tolerances and longer life
- Hardened steel cutter bodies ensure close tolerance finishing
- Screw-on modular heads and heavy metal extensions fit industry standard cutting systems
Metric Ball Nose Steel Holders
- * Note: All Dapra Ball Nose end mills accept either inch or metric inserts of like sizes.
Example: BNEM0750 and GWR20 accept either a 3/4" or 20mm diameter insert.
BNEM0500 and GWR12 accept either a 1/2" or 12mm diameter insert. -
Steel Holder Ordering Information D Ø
DiameterHolder E
Effective LengthL
Overall LengthS
Shank Dia.DN
Neck Dia.Insert Screw Tapered Solid Metric 8mm GWR08-100-10-RZK 25mm 100mm 10mm 7mm GWS 08 Straight Solid Metric 10mm GWR10-130-10-RZ 25mm 130mm 10mm 9mm GWS 10 12mm GWR12-150-12-RZ 47mm 150mm 12mm 10.5mm GWS 12 12mm SC-GWR-12-180-12MM-RZ 38mm 180mm 12mm
(CARBIDE)10.5mm GWS 12 16mm GWR16-180-16-RZ 52mm 180mm 16mm 14.5mm GWS 16 20mm SC-GWR-20-250-18MM-RZ 57mm 250mm 18mm
(CARBIDE)17mm GWS 18 20mm GWR20-230-20-RZ 65mm 230mm 20mm 18mm GWS 20 25mm GWR25-250-25-RZ 70mm 250mm 25mm 22.5mm GWS 25 25mm SC-GWR-25-250-25MM-RZ 76mm 250mm 25mm
(CARBIDE)22mm GWS 25 32mm GWR32-250-32-RZ 70mm 250mm 32mm 27.5mm GWS 32 Undersized Shank GWR Cutters 12mm US-GWR12-150-11MM-RZ 25mm 150mm 11mm 10.5mm GWS 12 16mm US-GWR16-180-15MM-RZ 52mm 180mm 15mm 14.5mm GWS 16 20mm US-GWR20-230-18MM-RZ 65mm 230mm 18mm 18mm GWS 20 25mm US-GWR25-250-24MM-RZ 70mm 250mm 24mm 22.5mm GWS 25
Metric Ball Nose Modular Heads & Modular Extensions
Dapra's Line of Screw-On Heads Fits Industry Standard Cutting Systems
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- Compatible with ISO standard modular cutting systems
- Greater effective reach than solid end mills
- Close-tolerance mounting minimizes runout
- Wrench flats accept adjustable wrenches – no special wrenches needed
Metric Ball Nose Screw-On Heads Dia. Holder M E Flutes 12mm GWR12-MOD M8 27mm 2 16mm GWR16-MOD M8 28mm 2 20mm GWR20-MOD M10 32.5mm 2 25mm GWR25-MOD M12 42mm 2 32mm GWR32-MOD M16 45mm 2 Dapra's Modular Extensions Provide Even More Cutting Options
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- Made of high-density tungsten, providing extra resistance to vibration and deflection
- Machined on both ends; can be cut in half and used with two different modular heads
- Shank diameters either match or are undersize compared to cutting diameters
Heavy Metal Metric Modular Extensions Modular Head Dia. Part No. OAL M
Mounting ThreadS
Shank Dia.20mm ME-0750-18MM-900 230mm M10 18mm 25mm ME-1000-25MM-1100 280mm M12 25mm 32mm ME-125/150-25MM-1200 305mm M16 25mm
Metric Ball Nose Inserts*
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Helical Cutting Edge Inserts (HBN) D Ø
DiameterHelical (HBN) 10mm HBN-10MM 12mm HBN-12MM 16mm HBN-16MM 20mm HBN-20MM 25mm HBN-25MM 30mm HBN-30MM 32mm HBN-32MM 
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Inserts Without Chipbreaker D Ø
DiameterWithout Chipbreaker 10mm BNR-10MM-N 12mm BNR-12MM-N 16mm BNR-16MM-N 20mm BNR-20MM-N 25mm BNR-25MM-N 30mm BNR-30MM-N† 32mm BNR-32MM-N 
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Inserts With Chipbreaker D Ø
DiameterWithout Chipbreaker 8mm BNR-08MM-CB 10mm BNR-10MM-CB 12mm BNR-12MM-CB 16mm BNR-16MM-CB 20mm BNR-20MM-CB 25mm BNR-25MM-CB 32mm BNR-32MM-CB -
* For insert grades and coatings, see chart below. Other coatings are available upon request. Contact Dapra for more information.
† Use size 32 insert screws for 30mm inserts.
| Uncoated (Base Grade) |
with Coating | Description | Specifications |
|---|---|---|---|
| F1 | Micro-grain tungsten carbide with high edge strength and good toughness. Good for machining steels, high-temperature alloys, cast iron and nonferrous materials. | (C-2), (K10) | |
| FPX | Titanium carbon nitride (TiCN) is a functional hard coating offering an optimal combination of hardness, toughness and antifriction characteristics. TiCN is recommended for high shock resistance. | 3000 HV, 400°F, .4 Co | |
| FPO | Premium grade for high-performance milling of steels up to 54 HRC. High-temperature PVD coating provides the ultimate in heat resistance and tool life. | 3200 HV, 1100°F, .4 Co | |
| FPA | Aluminum titanium nitride (AlTiN) is recommended when extra hardness and heat resistance are required. AlTiN makes both machining at higher speeds and dry machining possible. | 3600 HV, 1100°F, .4 Co | |
| FP-GLH | Premium high-temperature grade. Unbeatable performance and wear resistance in high-heat applications such as harder steels, tough stainless steels and high-temperature alloys. | 3600 HV, 2000°F, .2 Co |
- Match coating to material being cut and available speed/RPM (see chart on Metric Ball Nose Reference Page).
- FPA and FP-GLH coatings are best suited for higher operating speeds (temperatures) and harder materials.
- FPX and FPO coatings are best suited for low to medium operating speeds (temperatures) and softer materials.
- Other coatings available on request. Contact factory for details.
Metric Ball Nose Spare Parts & Tools
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Metric Spare Parts & Tools Insert Screw Metric Insert Size Wrenches TORX® Torque N/m Miscellaneous Description Catalog No. GWS 08 8 T-8F Manual Special Anti-Seize Grease ASG-120 GWS 10 10 T-10F Manual GWS 12 12 T-15F 6.0 GWS 16 16 T-15F 6.2 GWS 20 20 T-20F 6.2 GWS 25 25 T-30L 6.5 GWS 32 30 / 32 T-30L 6.5 TORX® is a registered trademark of Camcar/Textron.
Dapra Ball Nose products are made in the USA.