Specifications
| Variant | Price | Material | Weight |
|---|---|---|---|
| R8 (4mm -18mm) | ₹480.00 | High-quality spring steel (EN47) | 0.4 kg Approx |
| R8-3-20 | ₹3,800.00 | Hardened Alloy Steel (commonly 20CrMnTi or equivalent) | 3 – 5 kg |
Description
High Precision Single-Piece R8 Type Collets (4mm -18mm)
R8 direct-mount collets are precise, rigid, and cost-effective for milling machines with R8 spindles.
They are best when you use a limited set of tool shank sizes, and when high rigidity matters.
However, they’re less flexible than ER collet systems for covering many diameters.
Proper installation, cleaning, and maintenance are critical for performance and longevity.
R8 collets are commonly used in manual milling machines like Bridge ports and other knee mills. These direct-in-spindle collets hold round-shank tools securely without needing a separate chuck. They are inserted directly into the machine spindle and secured with a drawbar.
Features:
Key Features of Single-Piece R8 Type Collets:
1. Fixed-Size Design: Each collet holds one specific tool diameter precisely (e.g., 6 mm, 10 mm).
2. Direct Spindle Fit (R8): Inserts directly into an R8 spindle — no adapter or chuck required.
3. Drawbar Actuation: Secured using a drawbar, typically with a 7/16"-20 UNC thread.
4. Hardened Tool Steel: Made from heat-treated alloy steel for durability, wear resistance, and long life.
5. High Concentricity: Offers low runout (typically ≤ 0.015 mm) for better tool alignment and finish.
6. Sizes from 4 mm to 18 mm: Covers a wide range of tool sizes for milling, drilling, and reaming.
7. Quick Tool Change: Allows fast tool swaps without additional collet nut or chuck components.
8. Simple, Reliable Operation: Fewer components reduce maintenance and setup complexity.
Advantages:
High Precision Clamping: Designed to fit a specific tool size exactly, offering excellent concentricity and low runout.
Direct Mounting: Fits directly into the R8 spindle—no need for collet chucks or adapters.
Simple and Robust Design: Fewer components mean less maintenance and lower chance of mechanical failure.
Fast Tool Changes: Tool changes are quick and efficient—just loosen or tighten the drawbar.
High Clamping Force: Provides strong grip for medium-duty milling and drilling without slippage.
Cost-Effective: More affordable than full chuck systems; ideal for small shops and manual setups.
Durable Construction: Made from hardened steel, offering long service life under regular use.
Perfect for Manual Mills: Ideal for machines like Bridgeport, Rung Fu, Jet, and similar knee mills.
Function:
Single-Piece R8 Type Collets Collet Function:
1. Tool Holding: Firmly grips round-shank tools such as drills, end mills, reamers, and taps.
2. Direct Spindle Mounting: Fits directly into R8 spindles — no chuck or holder needed.
3. Precision Centering: Maintains accurate tool alignment with minimal runout for clean, precise cuts.
4. Drawbar Actuation: Operates via a drawbar from the top of the milling machine for tightening or releasing the tool.
5. Stable Clamping Force: Provides secure tool holding even during heavy cutting or vibration.
6. Size-Specific Fit: Each collet is machined to one tool diameter, ensuring tight tolerances and repeatability.
Application:
Applications of Single-Piece R8 Type Collets:
1. Holding end mills, drill bits, taps, and reamers directly in the spindle
2. Ideal for Bridgeport-type manual milling machines
3. Used in educational, fabrication, toolroom, and maintenance shops
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