CNC Spindle Drawbar Force Gauge | BT30/40/50 & HSK32–100 Tension Meter
Product Overview
The CNC Spindle Drawbar Force Gauge is a professional tension meter designed for accurate measurement of spindle clamping force (drawbar pull force) on CNC machining centers, milling machines, and other industrial spindle systems. It covers the most common spindle interfaces, including BT30, BT40, BT50 and HSK32, HSK40, HSK50, HSK63, HSK80, HSK100, as well as SK, CAT, ISO, and BBT series.
Regular drawbar force testing prevents tool pull-out, reduces workpiece scrap, extends spindle life, and ensures consistent machining accuracy. This gauge is widely used by machine tool maintenance teams, spindle rebuilders, and quality control departments.
Technical Specifications
| Parameter | Value / Description |
|---|---|
| Measurement accuracy | Grade 0.003 – 0.005 |
| Body material | 20CrMnTi alloy steel, quenched & hardened |
| Corrosion resistance | High (anti-rust treatment) |
| Impact resistance | Excellent (hardened structure) |
| Pressure gauge | German WIKA oil pressure gauge |
| Pressure unit conversion | 1 KG/cm² on gauge = 10 KG actual drawbar force |
| Internal area constant | 10.00875 (gauge pressure ×10 = tensile force in KG) |
| Hydraulic oil type | R68 (for preload restoration) |
Key Features
1. High Precision Measurement
The gauge delivers repeatable accuracy within 0.003–0.005 grade, allowing operators to detect clamping force degradation before it affects production quality.
2. Durable Alloy Steel Construction
Made of 20CrMnTi – a low-alloy steel known for its excellent hardenability, impact resistance, and wear resistance. After quenching and tempering, the body maintains high gloss and long service life even under shop floor conditions.
3. Simple Readout & Conversion
No complex electronics needed. The analog pressure gauge shows direct pressure values. Multiply the reading by 10 to obtain the actual drawbar pull force in kilograms.
Example: Gauge shows 25 KG → actual drawbar force = 250 KG.
4. Restorable Preload Design
Unlike disposable testers, this gauge allows field restoration of internal preload. Simply add R68 hydraulic oil and adjust the A rod – no special tools or factory service required.
5. Wide Compatibility
One gauge body with interchangeable adapters covers BT, HSK, SK, CAT, ISO, and BBT spindle tapers from size 20 to 100. Ideal for workshops with mixed machine brands.
6. Portable & Ready to Use
Compact size, no external power needed. Comes with refined packaging and multi-angle real-shot display for easy identification.
Detail Advantages
Precision Manufacturing, Superior Quality
High-Quality Steel
20CrMnTi Steel
Made of 20 alloy steel,
Precision manufactured, stable performance,
Not easily corroded, multiple production and inspection procedures
Product Features
Hardened by quenching,
Strong shock resistance,
Not easily rusted,
Impact resistance,
Long service life,
High gloss
Refined Packaging
Multi-angle real-shot display
Tensile Gauge Usage Precautions
A: Before using the tensile gauge, ensure the internal preload is normal.
1. Visually check if the pointer does not return to zero; there is still preload.
2. Manually check if the torsion pressure gauge and body rotate.
3. No rotation indicates there is still preload; rotation indicates no preload.
4. Tensile gauge pressure design: 1KG/CM = 10KG = 100N
5. Use a German WIKA oil pressure gauge.
B: Method to restore preload on the tensile gauge
1. Remove the B indicator plug.
2. Loosen the A indicator rod one turn.
3. Push the A rod inward (to reduce the oil level in the oil chamber).
4. Fill the B port with R68 hydraulic oil, then lock the indicator plug in.
5. Tighten the A rod; the C pressure gauge pointer will move upward.
6. Then... Loosen the stopper to allow a slight seepage of internal oil, adjusting the internal pressure until the pressure reading falls within the range of 10KG~30KG.
C: Tensile Gauge Reading Method
1. The internal area of this tensile gauge is 10.00875. Therefore, multiplying the pressure data indicated by the gauge pointer by 10 gives the correct tensile force. Relative to the Newton unit displayed on the electronic tensile gauge: 1 Newton = 9.8KG.
2. The pressure unit displayed on this product is 1KG = 10KG tensile force.
| Serial Number | Product Specifications | Precision (Grade) |
| 1 | BT30 | 0.003-0.005 |
| 2 | BT40 | 0.003-0.005 |
| 3 | BT50 | 0.003-0.005 |
| 4 | HSK32A | 0.003-0.005 |
| 5 | HSK40A | 0.003-0.005 |
| 6 | HSK50A | 0.003-0.005 |
| 7 | HSK63A | 0.003-0.005 |
| 8 | HSK80A | 0.003-0.005 |
| 9 | HSK100A | 0.003-0.005 |
| 10 | SK40 | 0.003-0.005 |
| 11 | SK50 | 0.003-0.005 |
| 12 | CAT40 | 0.003-0.005 |
| 13 | CAT50 | 0.003-0.005 |
| 14 | ISO20 | 0.003-0.005 |
| 15 | ISO25 | 0.003-0.005 |
| 16 | BBT40 | 0.003-0.005 |
| 17 | BBT50 | 0.003-0.005 |
Applications
Routine spindle maintenance in CNC machining workshops
Drawbar force calibration after spindle rebuild or repair
Troubleshooting tool pull-out or poor surface finish
Incoming inspection of new or used machine tools
Quality assurance for machine tool builders and resellers
Why Choose This Spindle Pull Force Gauge?
Customer Concern Our Solution
Inaccurate readings Precision grade 0.003–0.005, factory calibrated
Short product life 20CrMnTi steel, quenched, anti-corrosion
Hard to maintain Restorable preload + R68 oil refill
Limited spindle compatibility 17+ models available including BT and HSK
No OEM support Custom logo and packaging service
Contact & Support
For bulk orders, OEM branding, or technical consultation, please use the contact form or email us directly.
About Us
FAQ
A1: Founded in 2015, MSK (Tianjin) Cutting Technology Co., Ltd. is a professional manufacturer of high-performance carbide tools. We are certified under ISO 9001 by Rheinland and utilize advanced international equipment, including German SACCKE five-axis grinding centers, German ZOLLER six-axis tool inspection systems, and Taiwan PALMARY precision machines.
A2: We are a direct factory specializing in carbide cutting tools.
A3: Yes, absolutely. If you have a designated forwarder in China, we will gladly arrange delivery to them.
A4: We typically accept T/T (bank transfer). Other terms may be discussed based on order volume and cooperation history.
A5: Yes. We welcome OEM and customized orders. In addition, we offer label printing services to meet your branding needs.
A6:
Cost control – You get high-quality products at competitive prices.
Quick response – Our professional team provides quotes and answers your questions within 48 hours.
High quality – We are committed to delivering 100% high-quality products, backed by our integrity.
After-sales support & technical guidance – We provide tailored after-sales service and technical assistance based on your specific requirements.
