Screw-On Tool Heads & Modular Extensions

Modular Head Extension Dapra's Carbide Core Modular Extensions Are Ideal for Standard Inch End Mill Holders

Solid Carbide Modular Extensions

Dapra's NEW solid carbide modular extensions are ideal for use with modular heads during finishing applications. They feature:

  • Optimum rigidity for reduced deflection and chatter
  • No braze joints
  • Thru-coolant for delivery of air or coolant right at the cutting edge
Solid Carbide Modular Extensions
Solid Carbide Modular Extensions
For Head Dia. Extension Part No. Shank Dia. Effective Length OAL Thread A
.500" SC-ME-0500-6500-C .500" 1.500" 6.5" M8 .460"
.750" SC-ME-0750-7700-C .750" 2.250" 7.7" M10 .709"
1.000" SC-ME-1000-8300-C 1.000" 5.000" 8.3" M12 .890"/.950"

Caution: Solid carbide modular extensions are best suited for finishing and semi-finishing applications. They are not generally recommended for roughing applications due to carbide rigidity.

Carbide Core Modular Extensions

Carbide Core Modular Extensions
For Head Dia. Extension Part No. Shank Dia. Effective Length OAL Thread CC A CAD File
.750"/20mm CC-ME-0750-3500C-SS 0.750" 3.7" 5.77" M10 3/8" x 4.0" .660" DXF
.750"/20mm CC-ME-0750-3500C 1.000" 3.7" 6.0" M10 7/16" x 4.0" .660" DXF
1.000"/25mm CC-ME-1000-4500C 1.000" 4.7" 7.0" M12 7/16" x 5.0" .935" DXF
1.250"/1.500" CC-ME-1250-5500C 1.250" 5.7" 8.0" M16 1/2" x 6.0" 1.175" DXF

Extensions feature a cylindrical shank, with no Weldon flats. Hold with high-performance milling chucks or heat/mechanical shrink holders, or mill Weldon flats and use a short-length solid end mill holder.

2" Add-On Extensions
For Head Dia. Extension Part No. Effective Length Thread CAD File
.750"/20mm ME-0750-2"C EXTENSION ADAPTER 2.0" M10 DXF
1.000"/25mm ME-1000-2"C EXTENSION ADAPTER 2.0" M12 DXF
1.250"/1.500" ME-1250-2"C EXTENSION ADAPTER 2.0" M16 DXF
Carbide Core Modular Extensions


Screw-on modular tool headsDapra Modular Heads Screw on to Industry Standard Systems!

Dapra produces a full selection of Ball Nose, Square Shoulder and Toroid screw-on heads. Advantages include:

Square Shoulder Modular Heads

Square Shoulder Screw-On Modular Tool Head
Square Shoulder Screw-On Heads
Dia. Holder M DOC E Flutes Inserts Open-End Wrench CAD File
.750" SSEM0750-MOD-R35-2C M10 .350" 1.50" 2 10mm 9/16" DXF
.750" SSEM0750-MOD-R45-2C M10 .430" 1.50" 2 12mm 9/16" DXF
1.000" SSEM1000-MOD-R45-3C M12 .430" 1.50" 3 12mm 11/16" DXF
1.250" SSEM1250-MOD-R45-4C M16 .430" 1.75" 4 12mm 15/16" DXF
1.000" SSEM1000-MOD-R55-2C M12 .600" 1.50" 2 16mm 11/16" DXF
1.250" SSEM1250-MOD-R55-2C M16 .600" 1.75" 2 16mm 15/16" DXF
1.500" SSEM1500-MOD-R55-2C M16 .600" 1.75" 2 16mm 15/16" DXF

Ball Nose Modular Heads

Ball Nose Modular Tool Heads
Ball Nose Screw-On Heads
Dia. Holder M E Flutes Wrench CAD File
.500"/12mm GWR12-MOD M8* 1.05" 2 3/8" DXF
.625"/16mm GWR16-MOD M8* 1.11" 2 7/16" DXF
.750"/20mm GWR20-MOD M10 1.28" 2 9/16" DXF
1.000"/25mm GWR25-MOD M12 1.65" 2 11/16" DXF
1.250"/32mm GWR32-MOD M16 1.78" 2 15/16" DXF

* M8 modular extensions not available. Use ISO standard bars.


Toroid Modular Heads

Metric Screw-On Tool Head
Toroid Screw-On Heads
"R" Value Dia. Holder M E IC Flutes Wrench Insert CAD File
OPMH/RPMH
R3 .750" TREM075-MOD-R3-2C† M10 1.50" .375" 2 9/16" RDCH-32/HFDCH-32 DXF/DXF
R4‡ 1.000" TREM100-MOD-R4-2C‡ M12 1.50" .500" 2 11/16" RDCH-43 DXF/DXF
R4 1.250" TREM125-MOD-R4-3 M16 1.75" .500" 3 15/16" RDCH-43/HFDCH-43/SXEH-432 DXF/DXF
R4 1.500" TREM150-MOD-R4-3 M16 1.75" .500" 3 15/16" RDCH-43/HFDCH-43/SXEH-432 DXF/DXF
R6 1.500" TREM150-MOD-R6-2 M16 1.75" .750" 2 15/16" RXCH-63/OXCH-634 DXF/DXF

† TREM075-MOD-R3-2 does not come with top clamp.

‡ Uses RDCH-43 / RPMH-44 / OPMH-442 Inserts only.


Modular Screw-On Head ExtensionsModular Screw-On Head Extensions

Modular Screw-On Head Extensions

Modular Tool Head Extensions
Modular Extensions
Cutting Dia. Extension Part No. Overall Length M Shank Diameter
.750" / 20mm ME-0750-18MM-900-C 9" M10 18mm
1.000" / 25mm ME-1000-25MM-1100-C 11" M12 25mm
1.250" ME-125/150-25MM-1200-C 12" M16 25mm
1.500" ME-125/150-25MM-1200-C 12" M16 25mm

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