Gundrill-Deephole Drilling

Gundrills can reach almost endless depth, resulting in excellent straightness and close tolerance, though at a relatively lower speed.

  • Depth: 6000mm
  • Feed: 0.05~0.12mm/r
  • RPM: 60~80 rpm
  • Materials of gundrills: carbide, PCD, CBN
  • Advantages: straightness and close tolerance IT7, Ra0.5~2
  • Application: hydraulic holes, tube plates
  • OEM/ODM: Customized logo, packaging (MOQ 10 pieces)
  • Lead time:
    • 1 – 50 pieces: 10 days
    • >50 pieces: 15 days
  • Shipping fee: please contact for an immediate quotation
  • Supply: Wholesale or factory OEM supply
  • Seller’s shipping method(sample):DHL
    Estimated delivery: 2 weeks
    Estimated shipping Fee: $10 to $30 for 10 pieces
    Shipping fee calculation (download PDF), or contact us for quotation


Gundrill was initially for making deep holes when making guns, requiring high straightness and precision in diameter. Therefore, gundrilling must reach “endless” depth, resulting in excellent straightness and close tolerance. The hole quality achieved by the gundrilling process equals reaming or boring. Compared to other deep hole drilling methods, such as solid carbide deep hole drilling and BTA drilling, the disadvantage of gundrilling is the relatively lower penetration rate.
The gundrilling process begins from a precise pre-drilled pilot hole or drills bushing if the process is operated on a deep hole drilling machine. The coolant is fed through the coolant hole in the tool, and the chips are exhausted through the V-shaped groove (flute) on the drill tube from the drilled hole. Gundrilling technology has been developed and used in broader applications, such as deep hydraulic holes, tube plates in the energy industry, etc.

Inquiry CodeItemsFluteHole Diameter
D (mm)
GD-1201Single Flute gundrill1D2~D200Brazed carbide head
GD-1202Two Flute gundrill2D2~D200For non-ferrous materials
GD-1203Indexable gundrill1/2D12~D28With indexable inserts
GD-1204Solidcarbide gundrills1/2D0.7~D12Higher Penetration Rates
GD-1205Step gundrills1CustomManufactured per drawings

Custom, CNC production, Measure, Inspection

Extensive CNC Softwares

*Milling,turning,drilling and more
*Parametric programming

grinding wheel

Precise Grinding

*In-process dressing
*Branded carbide rods

CNC grinding program

CNC program library

*Repeatability and Consistancy
*Programming Efficiency

Presetting and Measuring

*Zoller and PG1000
*Trackable calibration

tool inspection


*Dedicated inspector
*Trackable inspection data


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  • To receive a correct replacement or full credit, kindly inform us within 14 days of receipt, in case the item you received is faulty. In the case of returned goods that are not defective, there will be a 20% return handling fee deducted from the original purchase price. Please ensure that the returned goods reach us within 14 days of the original purchase date, otherwise no credit will be issued. Contact us for more details in Return and Refund policies. If you decide to return and apply for refund, please download and fill in the Return Form, and attached the file to:

We use DHL global serive to deliver packages efficiently. Here is the Shipping Instruction and Shipping Rate at which you can simply estimate the shipping cost, or contact us for up-to-date calculation.