Ningbo Lianchuang Hewo Precision Tools Co., Ltd
| Packaging Details | standard packaging |
| Delivery Time | 7-10day |
| Supply Ability | 1000000 Piece/Pieces per Month |
| Point Angle | 90 Degrees |
| Material | High-speed Steel |
| Coolant Hole | Available |
| Accuracy | ±0.001 Inch |
| Flute Type | Single Flute |
| dc | (21-32) |
| Surface Finish | Bright Or Black Oxide |
| Helix Angle | 30 Degrees |
| Brand Name | ARNOLD |
| Place of Origin | China |
| Certification | ISO9001:2000 |
| Model Number | GD-DH (21-32) |
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Product Specification
| Packaging Details | standard packaging | Delivery Time | 7-10day |
| Supply Ability | 1000000 Piece/Pieces per Month | Point Angle | 90 Degrees |
| Material | High-speed Steel | Coolant Hole | Available |
| Accuracy | ±0.001 Inch | Flute Type | Single Flute |
| dc | (21-32) | Surface Finish | Bright Or Black Oxide |
| Helix Angle | 30 Degrees | Brand Name | ARNOLD |
| Place of Origin | China | Certification | ISO9001:2000 |
| Model Number | GD-DH (21-32) | ||
| High Light | Medical Device Speed Steel Gun Drills ，Medical Device indexable gun drill ，Excellent Surface Finish indexable gun drill | ||
A Gun Drill is a specialized deep hole drilling tool originally developed for manufacturing gun barrels—hence the name. It is designed to drill very deep and precise holes with excellent straightness, roundness, and surface finish.
Gun drills are widely used in industries like aerospace, automotive, mold making, medical devices, and hydraulics.
Key Features
Deep Hole Capability:
Capable of drilling depths exceeding 100 times the diameter (100×D) or more.
High Precision:
Excellent straightness, roundness, and surface finish.
Single-Flute Design:
Easier chip evacuation, though it requires slower feed rates.
Internal Coolant Flow:
Enables continuous cutting and efficient chip removal.
Comparison with Other Drilling Methods
| Feature | Gun Drill | Twist Drill | BTA Drill |
|---|---|---|---|
| Deep Hole Capability | Excellent (>100×D) | Limited (<5–10×D) | Superior (>150×D) |
| Hole Quality | High | Moderate | High |
| Chip Removal | Internal Coolant | External Coolant | Dual Flow (ID/OD) |
| Cost | Medium | Low | High |
|
**DC** |
***LF*** |
**PL** |
DCONMS |
**BD** |
**LS** |
Insert |
|
21.00 |
266.00 |
3.20 |
32.00 |
20.00 |
60.0 |
TOGT 10.. |
|
22.00 |
278.00 |
3.40 |
32.00 |
21.00 |
60.0 |
TOGT 11.. |
|
23.00 |
289.00 |
3.40 |
32.00 |
22.00 |
60.0 |
TOGT 11.. |
|
24.00 |
301.00 |
3.40 |
32.00 |
23.00 |
60.0 |
TOGT 11.. |
|
25.00 |
312.00 |
3.40 |
32.00 |
24.00 |
60.0 |
TOGT 11.. |
|
26.00 |
324.00 |
3.60 |
40.00 |
25.00 |
70.0 |
TOGT 12.. |
|
27.00 |
335.00 |
3.60 |
40.00 |
26.00 |
70.0 |
TOGT 12.. |
|
28.00 |
337.00 |
3.60 |
40.00 |
27.00 |
70.0 |
TOGT 12.. |
|
29.00 |
360.00 |
4.57 |
40.00 |
27.00 |
69.0 |
TOGT 13.. |
|
30.00 |
383.00 |
4.57 |
40.00 |
29.00 |
69.0 |
TOGT 13.. |
|
31.00 |
383.00 |
4.57 |
40.00 |
29.00 |
69.0 |
TOGT 13.. |
|
32.00 |
395.00 |
4.57 |
40.00 |
30.00 |
69.0 |
TOGT 13.. |
Common Applications
Firearm Barrels:
The original application.
Automotive Industry:
Used for crankshafts, fuel injectors, valve bodies, etc.
Aerospace Components:
Fuel lines, hydraulic manifolds, and structural elements.
Mold Making:
Cooling channels in injection molds.
Medical Devices:
Such as surgical tools, bone drills, and cannulas.
Company Details
Business Type:
Manufacturer
Year Established:
2016
Total Annual:
6000000-8000000
Employee Number:
100~120
Ecer Certification：
Verified Supplier
Ningbo Lianchuang Hewu Precision Tools Co., Ltd. specializes in providing comprehensive solutions for precision cutting technology. We offer customers high-quality metal cutting tools, including indexable inserts, carbide cutting tools, PCD cutting tools, as well as design development and technical ... Ningbo Lianchuang Hewu Precision Tools Co., Ltd. specializes in providing comprehensive solutions for precision cutting technology. We offer customers high-quality metal cutting tools, including indexable inserts, carbide cutting tools, PCD cutting tools, as well as design development and technical ...
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