2D–5D Compact SP/SQ Indexable U-Drill for Small-Diameter Holes
Compact SP-series indexable U-drills for small-diameter CNC holes. The supplied selection chart covers Ø13–24.5 mm with SP05, SP06 and SP07 insert families and lists 2×D to 5×D depth classes. Select the complete body by hole diameter and depth, then confirm the matching insert, shank and coolant connection.
Key Configuration
*Selection-chart ranges; confirm the orderable diameter and usable depth for each complete body model.
For a quotation: Send the hole diameter, drilling depth, workpiece grade, holder and coolant details, and required quantity. We will confirm the body and matching SP insert code.
Consistent Quality
Consistent geometry across repeat orders.
Flexible Orders
Small batches and mixed sizes available.
OEM Support
Custom marking, labels and packaging.
Standard & Custom
Standard sizes and custom configurations.
Product Overview
Precision Small-Bore Machining Redefined
The Compact U-Drill Series represents a breakthrough in small-diameter deep hole drilling technology. Specifically engineered with SP (Short Pitch) and SO (Special Optimized) geometries, these tools overcome the traditional limitations of machining bores under 25mm diameter. By combining an ultra-rigid compact body design with advanced insert technology, this series delivers unprecedented stability and precision in confined machining spaces where conventional tools typically fail.
Technical Specifications
| Parameter | Specification |
|---|---|
| Tool Series | SP-Type (General Purpose) / SO-Type (Optimized for Hard Materials) |
| Diameter Range | φ6.0mm – φ24.9mm (Standard), φ4.0mm Available on Request |
| Depth Capability | 2D, 3D, 4D, 5D Standard Configurations |
| Insert Locking | Double-Wedge Centrifugal Safety System |
| Coolant Pressure | Up to 70 Bar Through-Tool Coolant |
| Shank Options | HSK-E32, Capto C4-C6, BT30-40, Custom |
| Body Material | High-Tensile Alloy Steel with Anti-Corrosion Treatment |
| Runout Tolerance | ≤ 0.008mm at 4×D |
| Surface Finish | Ra 1.6μm Achievable in Single Operation |
Design Innovations
1. Geometry-Optimized Body Design
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SP-Type (Short Pitch): Features reduced flute pitch for maximum rigidity in general steel and cast iron applications, minimizing deflection during interrupted cuts
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SO-Type (Special Optimized): Incorporates harmonic-dampening mass distribution and variable helix angles specifically engineered for stainless steels, superalloys, and hardened materials
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Asymmetric Body Reinforcement: Proprietary design places additional material on the pressure side while maintaining adequate chip clearance
2. Micro-Precision Insert System
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Sub-Miniature Inserts: Available in 3.5mm and 4.5mm cutting edge lengths with six corner usability
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Multi-Layer Coating: TiAlN+AlCrN hybrid coating with graded interface technology
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Chipbreaker Evolution: Fifth-generation chipbreaker design maintains consistent chip control from 0.05-0.25mm/rev feed rates
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Integrated Wiper Geometry: Built-in wiper flats deliver superior surface finish without secondary tools
3. Enhanced Coolant Dynamics
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Dual-Orifice Design: Front and side coolant outlets create optimized flow patterns for different materials
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Venturi Chip Evacuation: Accelerated coolant flow through specially shaped channels creates vacuum-assisted chip removal
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Thermal Barrier Coating: Internal surfaces feature ceramic-based coating to reduce heat transfer to tool body
Performance Data
Machining Efficiency Comparison
| Operation | Conventional Drill | Competitive U-Drill | Our Compact U-Drill |
|---|---|---|---|
| Setup Time (min) | 15-20 | 8-12 | 3-5 |
| Tool Life (meters) | 50-80 | 120-180 | 250-350 |
| Surface Finish (Ra) | 3.2-6.4μm | 2.5-3.2μm | 1.6-2.0μm |
| Straightness (at 5D) | 0.08-0.12mm | 0.04-0.06mm | 0.015-0.025mm |
| Cost per Hole | $0.85-1.20 | $0.45-0.65 | $0.22-0.35 |
Material-Specific Performance
| Material Group | Recommended Feed (mm/rev) | Cutting Speed (m/min) | Coolant Pressure (Bar) |
|---|---|---|---|
| Carbon Steel (C<0.3%) | 0.08-0.15 | 180-220 | 20-30 |
| Stainless Steel (304/316) | 0.06-0.12 | 90-120 | 30-40 |
| Cast Iron (GG25) | 0.10-0.18 | 150-180 | 15-25 |
| Aluminum Alloy | 0.15-0.25 | 300-400 | 10-20 |
| Titanium (Ti-6Al-4V) | 0.04-0.08 | 50-70 | 40-50 |
Size Chart & Specifications
The SP selection chart identifies compact drill-body groups from Ø13 to Ø24.5 mm with SP05, SP06 and SP07 insert families. It lists 2×D, 3×D, 4×D and 5×D depth classes; confirm availability and usable cutting length for each complete drill-body code.
| Drill Diameter (mm) | Insert Family | Screw | Wrench |
|---|---|---|---|
| Ø13–13.5 | SP05 | M2.2 × 5 | T6 |
| Ø14–15.5 | SP05 | M2.2 × 5 | T6 |
| Ø16–21.5 | SP06 | M2.2 × 5 | T6 |
| Ø22–24.5 | SP07 | M2.5 × 7 | T6 |
Chart note: These are insert-family and hardware references, not a full dimensional drawing. Confirm the body diameter, usable drilling depth, shank diameter, overall length, exact insert code and supplied hardware for the ordered model.
How to Select the Drill Body
Cutting Data & Application Note
Start with grade-specific cutting speed and feed recommendations for the selected SP insert and workpiece. Check chip evacuation, coolant delivery, machine stability and hole quality at the actual diameter and depth. Speed, feed, tool life, finish and cost per hole depend on the complete tool configuration and machining conditions.
U-Drill Customization & OEM
Share the hole diameter, drilling depth, workpiece material, machine connection and current tool reference. We can review a standard indexable U-drill configuration or an application-specific drill body, then confirm the matching insert pockets, center and peripheral inserts, coolant arrangement and order details. Available modifications depend on the approved drawing and production feasibility.
Information for a Custom Quote
Use the following checklist for a replacement body or a new drilling application. Dimensions and options are confirmed for each model.
| Item | Details to Provide |
|---|---|
| Hole & Reach | Finished hole diameter and tolerance; blind or through hole; required drilling depth in mm; entry and exit conditions. |
| Body & Holder | Existing body code or drawing, depth ratio, shank style and size, holder model and available clearance. |
| Inserts & Hardware | Pocket family, center and peripheral insert codes, grades, screw specifications and required spares. |
| Application | Workpiece grade and hardness, machine type, coolant supply and current cutting conditions. |
| Order & OEM | Quantity, target delivery date, marking, packaging, drawings and inspection records required. |
| Performance Target | Hole quality, chip evacuation, insert life or cycle-time issue to be addressed; sample-trial criteria if needed. |
From Request to Approval
Fit note: Similar drill diameters or insert shapes do not establish pocket interchangeability. Verify the complete body model, insert designation and screw specification before ordering.
Send your drawing and requirements through our contact form.
U-Drill Quality Control
Quality checks are based on the approved drill-body drawing and the ordered insert configuration. State critical hole tolerances, body dimensions, coolant requirements and any reporting needs before production so the inspection scope can be agreed for the specific model.
Inspection & Documentation
The drawing and purchase specification define acceptance criteria. Confirm the inspection method, sampling level and documents needed for the order.
| Check Area | What to Confirm |
|---|---|
| Body Dimensions | Cutting diameter, usable depth, overall length, shank dimensions and drawing tolerances. |
| Insert Seats & Hardware | Center and peripheral pockets, seating faces, screw threads, required fasteners and tool fit. |
| Coolant & Condition | Specified connection and channel provision, visible damage, burrs and corrosion protection; any functional check by agreement. |
| Insert Identification | Complete insert codes, center/peripheral positions, grade and coating when inserts are included. |
| Requested Records | Dimensional report, material record, sample approval or batch identification when agreed in the order. |
Quality note: The drill body's inspection does not guarantee a finished hole tolerance or surface finish. Those results also depend on the selected inserts, workpiece, machine setup, coolant and cutting conditions; confirm them in a trial when critical.
Order & Delivery
Send a line-by-line list of drill-body codes, depth ratios and quantities. Specify whether inserts, screws and wrenches are included. Stock, minimum order quantity, sample availability and dispatch or production lead time are confirmed by configuration.
Send your model list and inspection requirements through our contact form for availability and delivery confirmation.
Product FAQs
Which small diameters are listed in the SP chart?
The compact selection shown here covers Ø13–24.5 mm. SP05 is listed for Ø13–15.5 mm, SP06 for Ø16–21.5 mm and SP07 for Ø22–24.5 mm. Confirm the complete body code for the exact diameter.
Are 2×D, 3×D, 4×D and 5×D available in every diameter?
The selection chart identifies these depth classes for the SP series but does not list every body dimension. Check the model-specific drawing for the orderable diameter and usable drilling depth.
Are SP05, SP06 and SP07 inserts interchangeable?
No interchangeability is established by the family names. Match the complete insert code, screw and pocket to the selected drill body before ordering replacements.
Does this chart specify an SQ insert option?
The supplied selection chart identifies SP05, SP06 and SP07 only. If you need an SQ configuration, send its separate drill-body drawing or complete model code for review.
What coolant pressure and cutting data should I use?
Confirm coolant pressure and flow for the exact body, insert grade, material and drilling depth. Use grade-specific speed and feed data as a starting point, then validate chip clearance and hole quality in a trial cut.
Is a specific hole tolerance or Ra finish guaranteed?
No series-wide hole tolerance, straightness or surface finish follows from the selection chart. Agree the target for your workpiece and verify it using the actual tool, inserts, machine and coolant setup.
Ordering & OEM FAQs
What information is needed for a quotation?
Send the hole diameter and tolerance, drilling depth in mm, workpiece material, machine holder, coolant capability, quantity and any current body or insert code.
Are the inserts, screws and wrench included?
Specify whether you need a drill body only or a complete kit. The quotation should identify the included insert codes, screw sizes, wrench and spare parts.
Can I request a different shank or depth?
Share the holder interface and required usable depth. A custom configuration is reviewed against the drawing, insert seat, coolant passage, quantity and production feasibility.
Can I evaluate a sample before a larger order?
Request the complete body and insert combination and define the workpiece, hole depth and inspection criteria. Sample availability and lead time are confirmed for the selected model.
Related Series & Inquiry
For other insert families and larger diameter groups, see the 2D–5D Indexable U-Drill range. For the exact body drawing and quotation, send your application requirements.
Need Sizes, Pricing or Custom Options?
Send us the required tool type, sizes, quantities, workpiece material and any OEM or custom requirements. We will confirm suitable specifications, availability, lead time and quotation details.
Drawings, size lists and reference photos are welcome.
