Spare: High-Precision Spindle for Vertical RAM Turret Milling Machines with/without Bearing and chuck-nut R8 With Bearing
This R8 spindle unit is optimized for lightweight vertical turret milling applications requiring versatile tool holding options. It delivers a direct replacement fit with polished surfaces to minimize runout during finishing passes. • Compatible with R8 taper machine head specifications • Drawbar thread M12x1.5 mm for quick tool changes • Weight 5.86 Kgs with heat-treated alloy steel body • Runout tolerance ≤ 0.005–0.01 mm for fine surface quality
Specifications
For: R8 With Bearing- Spindle Type
- R8
- Drawbar Thread
- M12x1.5 mm
- Runout
- ≤ 0.005–0.01 mm
- Installation
- Direct replacement
- Compatible Bearings
- 7207 / 6206 (varies by head design)
- Surface Hardness
- HRC 58–62
- Overall Length
- 540-600 mm ((varies by model)
- Material
- High-strength alloy steel (heat-treated)
- Finish
- Polished, hardened surface
- Weight
- 5.86 Kgs
Configurations
Click a row to switch| Variant | Drawbar Thread | Spindle Type | Compatible Bearings | Price |
|---|---|---|---|---|
| NT40/ISO40 With Bearing | M16x2.5 mm | ISO40/NT40 | 7207 / 6206 (varies by head design) | ₹24,800 |
| NT30/ISO30 With Bearing | M12x1.75 mm | ISO30/NT30 | 7207 / 6206 (varies by head design) | ₹21,900 |
| R8 With Bearing | M12x1.5 mm | R8 | 7207 / 6206 (varies by head design) | ₹20,700 |
| R8 without Bearing | M12x1.5 mm | R8 | 7207 / 6206 (varies by head design) | ₹14,500 |
| NT30/ISO30 without Bearing | M12x1.75 mm | ISO30/NT30 | 7207 / 6206 (varies as per design) | ₹15,600 |
| NT40/ISO40 without bearing | M16x2 mm | ISO40/NT40 | 7207 / 6206 (varies by head design) | ₹17,300 |
Maintenance & Care
- Regular lubrication extends bearing life and spindle performance
- Inspect runout levels periodically to ensure continued accuracy
- Store in dry environment to prevent corrosion on polished surfaces
- Follow manufacturer guidelines for bearing replacement intervals
Operational Reliability
- Maintains tight tolerances under high-speed cutting conditions
- Reduces vibration to improve surface finish on machined parts
- Engineered to withstand continuous industrial usage cycles
- Provides consistent rotational stability for precision tooling
Installation & Compatibility
- Direct replacement installation minimizes downtime during upgrades
- Complete assembly includes bearings and chuck-nut for immediate use
- Compatible with standard bearings such as 7207 / 6206 depending on head design
- Drawbar thread typically M12 or 1/2"-13 UNC for secure locking
- Typical unit weight is approximately 6.2 Kgs for logistics planning
Durable Construction
- Built from high-strength alloy steel for structural integrity
- Heat-treated surface hardness reaches HRC 58–62 for durability
- Polished, hardened surface finish minimizes friction and wear
- Overall length typically ranges from 540–600 mm for various models
Precision Performance
- Delivers runout tolerance of ≤ 0.005–0.01 mm for machining accuracy
- Compatible with ISO40/NT40 spindle types for broad machine fit
- Optimized for Vertical RAM Turret Milling Machines operations
- Ensures consistent rotational stability during high-speed cutting
More questions buyers ask
What is the function of a milling machine spindle?
The spindle is the rotating axis of a milling machine that holds the cutting tool or tool holder, providing the necessary torque and speed for machining operations.
How do I choose between NT40, NT30, and R8 spindles?
The choice depends on your machine's spindle taper specification. NT40 is for heavy-duty, NT30 for medium, and R8 is standard for many turret milling machines.
What does 'runout' mean in a spindle?
Runout refers to the deviation of the spindle from its true axis of rotation. Lower runout (e.g., ≤ 0.005 mm) ensures higher machining precision.
Are bearings included with these spindles?
We offer both options: variants with pre-installed high-quality bearings and variants without bearings for those who prefer to source their own.
What material are Pentagon spindles made from?
They are manufactured from high-strength alloy steel, heat-treated to a surface hardness of HRC 58–62 for maximum wear resistance.
Can I replace the spindle myself?
Yes, these are designed as direct replacements for standard vertical RAM turret milling machines, though professional installation is recommended to ensure alignment.
What maintenance is required for the spindle?
Regular lubrication, periodic runout checks, and keeping the spindle clean and free from corrosion are essential for long service life.
What is the typical weight of these spindles?
The weight varies by model, typically ranging from 5.7 kg to 6.2 kg.
Do these spindles come with a warranty?
Yes, all Pentagon machine spares are backed by our standard industrial warranty and after-sales support.
How do I order a spare spindle for my machine?
You can order directly through our website by selecting the variant that matches your machine's taper and bearing requirements.
Who should choose the NT40/ISO40 With Bearing variant?
Ideal for workshops requiring heavy-duty milling performance with a complete, ready-to-install assembly.
Who should choose the NT30/ISO30 With Bearing variant?
Best for medium-duty milling machines where a balanced, pre-assembled spindle is needed for quick maintenance.
Who should choose the R8 With Bearing variant?
Perfect for standard turret milling machines that use R8 tooling and require a reliable, high-precision replacement.
Who should choose the R8 without Bearing variant?
Suitable for technicians who prefer to install their own specific brand of bearings or have existing bearings in good condition.
Who should choose the NT30/ISO30 without Bearing variant?
Designed for cost-conscious maintenance where the user already has compatible bearings available.
Who should choose the NT40/ISO40 without bearing variant?
Best for heavy-duty users who want to customize their bearing setup or have spare bearings on hand.
How does NT40 compare to R8 in terms of performance?
NT40 provides higher rigidity and torque capacity compared to R8, making it better suited for heavy-duty cutting tasks.
Is there a significant difference between spindles with and without bearings?
Spindles with bearings offer a 'plug-and-play' solution, while those without provide flexibility for custom bearing choices and cost savings.
Which spindle taper is most common for turret mills?
R8 is the most common for standard turret mills, while NT30 and NT40 are common for more robust, industrial-grade machines.
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Full description
This R8 spindle unit is optimized for lightweight vertical turret milling applications requiring versatile tool holding options. It delivers a direct replacement fit with polished surfaces to minimize runout during finishing passes. • Compatible with R8 taper machine head specifications • Drawbar thread M12x1.5 mm for quick tool changes • Weight 5.86 Kgs with heat-treated alloy steel body • Runout tolerance ≤ 0.005–0.01 mm for fine surface quality