45mm Series CNC Drag Chain - Bridge Open Type

45mm Series Overview

The 45mm series CNC drag chain (bridge open type) is molded from 30% glass-fiber reinforced PA66 nylon for heavy-duty CNC applications. With 45mm inner height, this series accommodates cables up to 40mm outer diameter and offers internal widths from 50mm to 300mm — making it the ideal choice for large CNC equipment with substantial cable bundles. Also referred to as 45mm cable carrier, 45mm cable chain, or 45mm cable track.

When to Choose the 45mm Series

The 45mm series is the right choice when your 25mm or 35mm series drag chains are too narrow for your cable bundle, and you need a larger cross-section for heavy cables, thicker hoses, or multiple lines running together. This series is ideally suited for large cable bundles — typically up to 14 to 20 standard cables or hoses, depending on the width you select. It works best on heavy-duty CNC equipment such as large machining centers, heavy-duty lathes, gantry milling machines, and laser cutting systems where substantial cable loads and larger routing spaces are the norm. The open bridge design still allows for fast heat dissipation and easy cable access, even with larger bundles. The 45mm series also handles longer travel distances better than smaller series, making it suitable for machines with extended axis strokes.

Not recommended for: tight installation spaces that require a smaller 25mm or 35mm series, or extremely heavy cable bundles that demand a 55mm or larger chain. For those applications, consider our smaller series or 55mm series instead.

Material - 30% Glass-Fiber Reinforced PA66

Our 45mm series CNC drag chain is molded from 30% glass-fiber reinforced PA66 nylon. This material formulation delivers significantly higher strength and impact resistance compared to unfilled nylon, making it well-suited for the repeated flexing and mechanical stress encountered in heavy-duty CNC applications. The glass-fiber reinforcement also provides exceptional wear resistance, giving the chain a service life of over 10 million cycles under normal operating conditions.

The material maintains stable performance across a broad temperature range from -40°C to +130°C, ensuring reliable operation in both cold workshops and high-heat machining environments. It offers good resistance to oils, coolants, and mild acids or alkalis, so it won't swell or crack after prolonged exposure to industrial fluids commonly found in machine tool applications. The compound is UL94 V-2 rated for flame retardancy, adding a layer of safety protection. Additionally, the material's natural damping properties keep operating noise below 60dB, which is beneficial for precision machining environments where low noise is preferred.

45mm Series Size Chart

Item No	Internal Dimensions      (H x W)    mm	External Dimensions       (H x W)          mm	Bending   Radius    (R)             mm	Pitch           mm	Chain Links per Meter     pcs	Opening Principle	Max cable diameter               mm
YDLRB4550	45X50	65X77	R75       R100     R125     R150     R175     R200    R250   R300	68.1	15	bridge    type	40.5
YDLRB4560	45X60	65X87
YDLRB4575	45X75	65X102
YDLRB4590	45X90	65X117
YDLRB45100	45X100	65X127
YDLRB45117	45X117	65X145
YDLRB45125	45X125	65X152
YDLRB45150	45X150	65X177
YDLRB45175	45X175	65X202
YDLRB45200	45X200	65X227
YDLRB45250	45X250	65X277
YDLRB45300	45X300	65X327

Bridge Open Type - Key Advantages

The bridge open type design means the chain is openable at the top with a screwdriver. This provides three key benefits: fast heat dissipation – airflow keeps cables cool during high-speed operation; easy installation – openable chain links allow cables to be laid in without threading; visual inspection – cables remain partially visible, making it easy to spot wear or damage. Additionally, the bridge type is significantly lighter than steel drag chains — about one-third the weight — which reduces the load on your machine's drive system and allows for faster acceleration and deceleration, even with larger cable bundles.

Common Applications for 45mm Series

The 45mm series is commonly used on heavy-duty CNC equipment where cable bundles are large and substantial. Typical applications include large CNC machining centers, heavy-duty CNC lathes, gantry milling machines, CNC laser cutters, CNC plasma cutters, woodworking CNC routers, and heavy industrial automation equipment. For machines with extremely heavy cable loads or very long travel distances, we recommend moving up to the 55mm or 65mm series — the 45mm series is best suited for equipment with large cable requirements and standard to extended routing spaces.

Related Product - Enclosed Type

Need full chip and coolant protection for your 45mm series?See our 45mm Enclosed Type CNC Drag Chain:
[Internal link to /cnc-drag-chain-enclosed-type/45-series]