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Henan San Kuang Machinery Technology Co., Ltd., established in 2014 with a factory area of 10,000–30,000 square meters and an annual export value of US$2.5–5 Million, is a professional manufacturer of industrial transmission parts. Our Custom Machined Pin Bush Coupling With Keyway & Set Screw is designed to deliver reliable torque transmission in demanding machinery applications. Combining precision machining with rugged materials, this coupling ensures minimal backlash, easy installation, and long service life for your equipment. We serve clients across North America, South America, Europe, Southeast Asia, Africa, and the Middle East with ISO9001 quality management — your trusted partner for tailor-made coupling solutions.
Product Overview
The pin bush coupling is a flexible coupling that uses elastomeric bushes (or pins) to transmit torque while accommodating slight misalignments. Our version comes with a pre-cut keyway and set screw for secure shaft connection, eliminating the need for additional modifications. It is widely used in conveyors, pumps, fans, gearboxes, and other industrial equipment where shock absorption and vibration dampening are required.
Key Features & Technical Specifications
Precision Machined Pin & Bush Assembly — Ensures consistent fit and torque capacity.
Keyway & Set Screw Standard — Quick and secure shaft mounting; no additional drilling needed.
Material Options — High-strength steel or ductile cast iron for durability and wear resistance.
Customizable Dimensions — Bore, overall length, pin diameter, and bush hardness can be tailored to your application.
Low Maintenance — Oil-less design with self-lubricating bushings available upon request.
Misalignment Compensation — Accepts angular, parallel, and axial misalignment up to certain limits (design dependent).
Surface Treatment — Black oxide, phosphating, or galvanizing optional to resist corrosion.
| Parameter | Typical Range / Value |
|---|---|
| Bore Diameter (d) | 10 mm – 100 mm (customizable) |
| Overall Length (L) | 30 mm – 200 mm (custom) |
| Outer Diameter (D) | 50 mm – 250 mm (design dependent) |
| Number of Pins | 4 – 12 (based on size) |
| Bush Material | Nitrile rubber / Polyurethane (custom) |
| Torque Capacity | Up to 5000 N·m (varies with size) |
| Set Screw Thread | M6 – M20 (standard hex socket) |
| Keyway Dimension | Per DIN 6885 or customer specification |
Advantages for End Users
Reduced Downtime — Pre-machined keyway and set screw allow quick installation on site, no extra processing.
Enhanced Equipment Protection — The elastomeric bushes absorb shock loads and dampen vibration, extending life of connected components.
Cost-Effective Customization — We can adjust bore, keyway, and overall dimensions without expensive tooling changes.
Global Compatibility — Designed to meet international shaft standards (metric, inch) — suitable for export to your region.
Reliable Performance — Each coupling is inspected before shipment to ensure concentricity and balance.
Trusted by industries worldwide: Henan San Kuang Machinery Technology Co., Ltd. operates a 10,000+ m² factory with 51–100 skilled workers, achieving annual export revenue of US$2.5–5 Million. We hold ISO9001 certification and have shipped couplings to ports of Shanghai, Lianyungang, Qingdao, and Tianjin. Our experienced team can provide tailored solutions (e.g., special keyway forms, alternative bush materials) within fast lead times — usually 15–30 working days for custom orders. We welcome drawings or samples for reverse engineering. Contact us for a quote and let our precision machining solve your transmission needs.
Frequently Asked Questions
Q1: What materials are available for the pin bush coupling?
A: Standard materials are high-strength carbon steel (e.g., 45#) or ductile cast iron (QT400-18). For harsh environments, stainless steel or alloy steel can be supplied upon request. Bushings are typically made of nitrile rubber or polyurethane; other elastomers are customizable.
Q2: Can I order a coupling with a non-standard bore diameter?
A: Yes, we specialize in custom machining. You can specify any bore diameter, keyway size, and set screw location. Just send us your shaft dimensions and we will produce to your drawing or reverse engineer from a sample.
Q3: What is the maximum torque capacity of this coupling?
A: Torque capacity depends on the coupling size, number of pins, and bush material. For a typical 60 mm bore coupling, it can handle up to 2000 N·m. Larger custom designs can exceed 5000 N·m. Contact our engineering team for exact calculations based on your application.
Q4: Does the coupling come with a warranty?
A: Yes, we offer a standard 12-month warranty against manufacturing defects under normal operating conditions. Extended warranties may be arranged for bulk orders.
Q5: What is the typical lead time for custom orders?
A: For prototype/pilot orders, lead time is 15–20 working days after drawing approval. For mass production (100+ units), it is 25–35 working days. Urgent orders can be expedited with prior discussion.
Q6: How do you ensure the keyway and set screw are aligned?
A: During CNC machining, we use precision fixtures to cut the keyway at a specific clock position (e.g., 90° or 0° relative to set screw). The set screw hole is drilled and tapped exactly 180° opposite the keyway for balanced locking. Each unit is verified with a go/no-go gauge.
Q7: Can I get a sample before placing a bulk order?
A: Absolutely. Sample orders are welcome. We can produce one piece for fit testing. Sample cost and shipping are negotiable, and the cost can be deducted from future bulk orders.
Q8: What packaging do you use for export?
A: Each coupling is individually wrapped with anti-rust paper, then packed in wooden cases or cartons with foam inserts. For large quantities, we use plywood pallets or export-standard crates. Shipping marks and documentation are prepared according to your instructions.
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