✨ 4mm-10mm Bore Rigid Coupling Set Screw, Shaft Coupler Connector for 3D Printers
🖼️ Product Images | 45 Steel Rigid Shaft Coupling With Set Screws Visual Guide
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🔍 About This Heavy-Duty 45 Steel Rigid Shaft Coupling
This heavy-duty 45 Steel Rigid Shaft Coupling is engineered for high-precision mechanical shaft transmission. Different from ordinary iron and stainless steel, it adopts high-strength 45 steel material with higher hardness and better compression resistance, ensuring ultra-stable torque transmission. Featured with professional 90° vertical fastening structure and 8 sets of M4 fixing screws, this rigid coupling provides super strong clamping force, effectively eliminating shaft shaking and rotation clearance. With ultra-high precision 0.05mm aperture tolerance and full-size shaft diameter options, it is widely used for motor connection, hardware equipment, mold processing and various mechanical transmission scenarios. Each product is equipped with complete fixing screws and a free tightening wrench, cost-effective and ready for direct installation.
⭐ Key Features of Our 45 Steel Rigid Shaft Coupling
- ✅ High Hardness 45 Steel Material: Made of premium 45 steel material, which belongs to high-strength iron material. Its hardness and rigidity are far higher than ordinary iron, with strong compression resistance and deformation resistance. It can maintain stable performance under high torque and high-speed operation, not easy to deform or loose.
- ✅ 90° Vertical 8-Screw Fastening: Adopts professional 90° vertical symmetrical fastening structure, matched with 8 M4 fixing screws. The multi-point uniform clamping design provides super strong locking force, completely eliminating shaft shaking, displacement and rotation clearance, realizing zero-clearance precise transmission.
- ✅ Ultra-high Precision 0.05mm Tolerance: Strict industrial precision machining, aperture tolerance controlled within 0.05mm. The through-hole design ensures smooth shaft fitting, high coaxiality, effectively ensuring the accuracy and stability of mechanical operation. Note: Not recommended for ultra-high precision equipment with extremely strict requirements.
- ✅ Symmetrical Through-hole Structure: Reasonable shaft half-clamping design, uniform stress on both ends, balanced transmission force, effectively reducing equipment vibration and wear, greatly extending the service life of motors and mechanical equipment.
- ✅ Complete Size Coverage: Covers common mainstream bore sizes from 4mm to 10mm, including special 6.35mm specification. Rich size options meet various matching needs of different motor shafts and mechanical equipment.
- ✅ Wide Application Scenarios: Ideal for stepper motors, servo motors, 3D printers, tool jigs, mold equipment, mechanical modification and DIY precision transmission projects.
- ✅ Complete Accessories Included: Every coupling comes with 8 fixing screws and one tightening wrench for immediate installation.
- ✅ Round-The-Clock Professional Customer Support: Online service team provides timely guidance on size selection, installation tips and all pre & after-sales consultation issues.
📊 Technical Specifications | Rigid Shaft Coupling Details
| Specification | Details |
|---|---|
| Product Name | 4mm-10mm Bore Rigid Coupling Set Screw, Shaft Coupler Connector for 3D Printers |
| Material | High-strength 45 Steel (Harder Than Ordinary Iron, Higher Rigidity) |
| Product Type | Rigid Shaft Coupling / Fixed Shaft Connector |
| Total Length | 35mm (Uniform for all specifications) |
| Outer Diameter | 14mm / 16mm (Depends on bore size) |
| Fastening Structure | 90° Vertical Fastening Design, Fixed by 8PCS M4 Machine Screws |
| Precision Tolerance | Ultra-high precision 0.05mm aperture error |
| Structure Feature | Through-hole design, symmetrical shaft clamping structure |
| Package Accessories | 8PCS Fixing Screws + 1PC Tightening Wrench |
| Available Bore Sizes | 4-4,4-5,4-6,4-7,4-8,5-5,5-6,5-7,5-8,6-6,6-7,6-8,6.35-6.35,6.35-8,7-7,7-8,8-8,8-10,10-10 |
| Applicable Scenarios | 3D Printers, Stepper/Servo Motors, Mechanical Equipment, Mold & Hardware Fixtures, DIY Mechanical Projects |
| After-Sales Guarantee | Free return and exchange for manufacturing defects, full professional support for size matching, installation guidance and product usage questions |
❓ Frequently Asked Questions | 45 Steel Rigid Shaft Coupling FAQ
What application fields are these rigid shaft couplings suitable for?
This 45 steel rigid shaft coupling with set screws has extensive cross-industry applicability: 1. Motor Equipment: Shaft connection and torque transmission for stepper motors, servo motors and small motors; 2. Mechanical Transmission: Shaft connection, power transmission and synchronous operation of various mechanical equipment; 3. Hardware & Mold Industry: Hardware fixture connection, mold equipment assembly; 4. DIY Mechanical Projects: Custom mechanical modification, experimental equipment assembly and precision transmission fixing including 3D printers.
What bore combinations are available for this rigid coupling?
We provide mainstream bore combinations ranging from 4mm to 10mm, including the commonly used special size 6.35mm. Two outer diameter options: OD14mm and OD16mm with uniform length of 35mm. Available sizes: 4-4,4-5,4-6,4-7,4-8,5-5,5-6,5-7,5-8,6-6,6-7,6-8,6.35-6.35,6.35-8,7-7,7-8,8-8,8-10,10-10.
What are the advantages of 8PCS 90° set screw fastening design?
The symmetrical 90° vertical layout with 8 M4 screws creates uniform multi-point clamping force. It provides powerful locking performance, completely eliminates shaft offset, vibration and rotational backlash, achieving zero-backlash precise power transmission even under high speed and load conditions.
How to select the correct coupling size?
First measure the diameter of two shafts you want to connect, then choose the matching bore combination. Confirm the thickness of clamped components fits the total length of 35mm. Please contact customer service for confirmation if you are unsure about dimensions before purchase.
Important installation reminders?
Tighten all 90° set screws evenly to guarantee uniform stress and good coaxiality to avoid shaft deviation. Do not over-tighten to prevent thread or coupling deformation. Note: This coupling is made of 45 steel instead of stainless steel.
🏆 Why Choose Our 45 Steel Rigid Shaft Couplings?
Our rigid shaft couplings are manufactured from high-strength 45 steel, harder and more durable than regular iron. 8-screw 90° fastening design delivers excellent clamping force and zero-clearance transmission. With 0.05mm high precision tolerance and abundant bore combinations covering 4mm to 10mm, they are ideal for 3D printers, motors, fixtures and DIY mechanical equipment. Each coupling is supplied with matching screws and tightening wrench. All items pass strict quality inspection, supported by all-day customer service, your cost-effective solution for precise shaft connection!
✨ Purchase Notice: Please confirm required shaft diameter and select proper bore combination before ordering. The aperture tolerance is 0.05mm, check whether it meets your precision requirements. Tighten set screws evenly, avoid excessive force. This product is made of 45 steel (not stainless steel). Not recommended for long-term use in strong acid & alkali environments. If defective goods received, attach clear item photos for free return or exchange. Our professional support team will reply all inquiries within 24 hours – add to cart now!
On 31/07/2026 at 13:21:26 AEST, seller added the following information: