It is made of No. 45 steel, which is a kind of iron, but it is harder than ordinary iron!

The length of the coupling is unified as: 22mm

There are three types of outer diameters according to different apertures: 14mm, 16mm, 20mm

The rigid coupling is a 90-degree fastening design and is fastened by four machine-meter screws!

Made of pure steel, the hole diameter error is 0.03mm (basically negligible), through hole design, the length of the two holes each occupies half of the coupling!

It is widely used in electric motors, hardware, molds, and mechanical transmission occasions. Welcome to wholesale and customize!

Four machine screws are provided for each coupling, and a tightening wrench is provided for each order! Need more, you can take a single shot! (There are two screw specifications)

Size description:

The following 9 types, the outer diameter of the coupling is 14mm, and the length is 22mm:

4-4 means the hole diameter on one side is 4mm, and the hole diameter on the other end is 4mm; (the side holes use M4 machine-meter screws)
4-5 means 4mm diameter on one side and 5mm diameter on the other end; (M4 machine-meter screws are used for the side holes)
4-6 means the diameter of one side is 4mm and the other end is 6mm; (the side holes use M4 machine screws)
5-5 means the diameter of one side is 5mm, and the other end is 5mm; (the side holes use M4 machine screws)
5-6 means the diameter of one side is 5mm, and the other end is 6mm; (the side holes use M4 machine screws)
5-8 means the diameter of one side is 5mm, and the other end is 8mm; (the side holes use M4 machine screws)
6-6 means the diameter of one side is 6mm and the other end is 6mm; (the side holes use M4 machine screws)
6-8 means the diameter of one side is 6mm, and the other end is 8mm; (the side holes use M4 machine screws)
8-8 means that one side has a hole diameter of 8mm and the other end has a hole diameter of 8mm; (the side holes use M4 machine screws)
 
The following 3 types, the outer diameter of the coupling is 16mm, and the length is 22mm:

6-10 means the diameter of one side is 6mm, and the other end is 10mm; (the side holes use M4 machine screws)
8-10 means that one side has a hole diameter of 8mm and the other end has a hole diameter of 10mm; (the side holes use M4 machine screws)
10-10 means the hole diameter on one side is 10mm, and the hole diameter on the other end is 10mm; (the side holes use M4 machine-meter screws)
 
The following 3 types; the outer diameter of the coupling is 20mm, and the length is 22mm:
 
8-12 means that one side has a hole diameter of 8mm and the other end has a hole diameter of 12mm; (the side holes use M5 machine-meter screws)
10-12 means the hole diameter is 10mm on one side, and the hole diameter on the other end is 12mm; (the side holes use M5 machine-meter screws)
12-12 means that one side has a hole diameter of 12mm, and the other end has a hole diameter of 12mm; (the side holes use M5 machine-meter screws)