Concave Linear Motion Spline

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GJFG Concave Linear Motion Spline

The GJFG concave liner motion spline with flange spline nut has a round cross section. A larger journal diameter is allowed in its design than that of the convex spline. When the balls roll and circulate in the raceway and the ball return path, the spline nut and spline shaft are moving linearly.

The concave linear motion spline features compact structure and easy assembly. In addition, with the help of the retainer, balls will be kept in its place even if the spline shaft is drawn out of the nut. The spline shaft is made of HRC58 quenched alloy steel, and the spline nut is made of HRC58 quenched alloy steel or carburized and quenched alloy structural steel. The use of quality material helps achieve long service life and high hardness.

The concave linear motion spline is designed with precisely machined R-shaped groove, and the groove comes with a diameter approximate to that of the ball diameter. In this way, the contact area of the ball is increased to acquire higher load bearing capacity. Since the concave spline uses interference fit, the balls are able to evenly and smoothly transmit the torque coming from the spline shaft or the spline nut. As zero clearance or interference fit in the rotational direction is realizable, the concave spline is capable of operating in high speed straight motion and rotation.

The GJFG concave linear motion spline is commonly used in the spindle of spot welding machine, tool post, indexing shaft, arms of industrial robot, automatic loaders, measuring instrument, main shaft of automatic plotting machine, wire winders, and main shaft of packaging machine, etc.

Technical Specifications of the GJFG Concave Linear Motion Spline (Unit: mm)
Model Shaft Outer Diameter d0(h7) Nut Outer Diameter D(h6) Nut Length L1 Max. Shaft Length L Flange Diameter D1 Mounting Hole Center Distance D2 Flange Thickness H
GJFG16 0 16 -0.018 0 31 -0.016 0 50 -0.2 400 0 51 -0.2 40 7
GJFG20 0 20 -0.021 0 35 -0.016 0 63 -0.2 500 0 58 -0.2 45 9
GJFG25 0 25 -0.021 0 42 -0.016 0 71 -0.3 700 0 65 -0.3 52 9
GJFG30 0 30 -0.021 0 48 -0.016 0 80 -0.3 1000 0 75 -0.3 60 10
GJFG40 0 40 -0.025 0 64 -0.019 0 100 -0.3 1000 0 100 -0.3 82 14
GJFG50 0 50 -0.025 0 80 -0.019 0 125 -0.3 1400 0 124 -0.3 102 16
GJFG60 0 60 -0.03 0 90 -0.022 0 140 -0.3 1400 0 134 -0.3 112 16
GJFG80 0 80 -0.03 0 120 -0.022 0 160 -0.4 1400 0 168 -0.3 144 20
GJFG100 0 100 -0.035 0 150 -0.025 0 190 -0.4 1400 0 200 -0.3 170 25
GJFG120 0 120 -0.035 0 180 -0.025 0 220 -0.4 1400 0 252 -0.3 216 30
Model Counter Sunk Hole Depth h Counter Sunk Hole Diameter d2 Via hole diameter d1 Lubrication hole diameter d Lubrication hole position F Basic torque rating
Dynamic torque CT (Nm) Static torque COT (Nm)
GJFG16 4.4 8 4.5 2 18 32 30
GJFG20 5.4 9.5 5.5 2 22 55 55
GJFG25 5.4 9.5 5.5 3 26.5 103 105
GJFG30 6.5 11 6.6 3 30 148 171
GJFG40 8.6 14 9 4 36 375 415
GJFG50 11 17.5 11 4 46.5 760 840
GJFG60 11 18 11 5 54 1040 1220
GJFG80 12.8 20 13.5 5 60 1920 2310
GJFG100 16.8 26 17.5 5 70 3010 3730
GJFG120 20.6 32 22 6 80 4100 5200

YiGong is a professional concave linear motion spline manufacturer based in China. We provide various types of products such as concave linear motion spline, ball screw, linear motion bushing, and miniature linear guide.

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