• THK LT Ball Spline Nut (Medium-Torque, Cylindrical with Keyway)
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THK LT Ball Spline Nut (Medium-Torque, Cylindrical with Keyway)

THK LT Ball Spline Nut (Medium-Torque, Cylindrical with Keyway)

THK LT-type Ball Spline Nut, medium-torque cylindrical type with keyway — most compact configuration.

Key features

  • LT4/LT5: no retainer, do not remove nut from shaft (balls will fall out)
  • High-temperature option available for LT16–LT100
  • Sizes: LT4–LT100

Specifications

Type LT Ball Spline Nut, Medium-Torque
LT4 THK LT4, D=10mm L=16mm medium-torque, CT=0.59N·m C0T=0.78N·m | Model: LT4 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 10 mm | Length L: 16 mm | Keyway Width b: 2 mm (H8) | Keyway Depth t: 1.2 mm | Ball Rows: 4 | Dynamic Torque CT: 0.59 N·m | Static Torque C0T: 0.78 N·m | Dynamic Load C: 0.44 kN | Static Load C0: 0.61 kN | Static Moment MA1: 0.88 N·m | Nut Mass: 5.2 g | Shaft Mass: 0.1 kg/m | Options: ⚠️ No retainer — do NOT remove nut from shaft
LT5 THK LT5, D=12mm L=20mm medium-torque, CT=0.88N·m C0T=1.37N·m | Model: LT5 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 12 mm | Length L: 20 mm | Keyway Width b: 2.5 mm (H8) | Keyway Depth t: 1.2 mm | Ball Rows: 4 | Dynamic Torque CT: 0.88 N·m | Static Torque C0T: 1.37 N·m | Dynamic Load C: 0.66 kN | Static Load C0: 0.88 kN | Static Moment MA1: 1.5 N·m | Nut Mass: 9.1 g | Shaft Mass: 0.15 kg/m | Options: ⚠️ No retainer — do NOT remove nut from shaft
LT6 THK LT6, D=14mm L=25mm medium-torque, CT=0.98N·m C0T=1.96N·m | Model: LT6 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 14 mm | Length L: 25 mm | Keyway Width b: 2.5 mm (H8) | Keyway Depth t: 1.2 mm | Ball Rows: 4 | Dynamic Torque CT: 0.98 N·m | Static Torque C0T: 1.96 N·m | Dynamic Load C: 1.18 kN | Static Load C0: 2.16 kN | Static Moment MA1: 4.9 N·m | Nut Mass: 17.0 g | Shaft Mass: 0.23 kg/m | Options: Standard
LT8 THK LT8, D=16mm L=25mm medium-torque, CT=1.96N·m C0T=2.94N·m | Model: LT8 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 16 mm | Length L: 25 mm | Keyway Width b: 2.5 mm (H8) | Keyway Depth t: 1.2 mm | Ball Rows: 4 | Dynamic Torque CT: 1.96 N·m | Static Torque C0T: 2.94 N·m | Dynamic Load C: 1.47 kN | Static Load C0: 2.55 kN | Static Moment MA1: 5.9 N·m | Nut Mass: 18.0 g | Shaft Mass: 0.4 kg/m | Options: Standard
LT10 THK LT10, D=21mm L=33mm medium-torque, CT=3.92N·m C0T=7.84N·m | Model: LT10 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 21 mm | Length L: 33 mm | Keyway Width b: 3 mm (H8) | Keyway Depth t: 1.5 mm | Ball Rows: 4 | Dynamic Torque CT: 3.92 N·m | Static Torque C0T: 7.84 N·m | Dynamic Load C: 2.84 kN | Static Load C0: 4.9 kN | Static Moment MA1: 15.7 N·m | Nut Mass: 50.0 g | Shaft Mass: 0.62 kg/m | Options: Standard
LT13 THK LT13, D=24mm L=36mm medium-torque, CT=5.88N·m C0T=10.8N·m | Model: LT13 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 24 mm | Length L: 36 mm | Keyway Width b: 3 mm (H8) | Keyway Depth t: 1.5 mm | Ball Rows: 4 | Dynamic Torque CT: 5.88 N·m | Static Torque C0T: 10.8 N·m | Dynamic Load C: 3.53 kN | Static Load C0: 5.78 kN | Static Moment MA1: 19.6 N·m | Nut Mass: 55.0 g | Shaft Mass: 1.1 kg/m | Options: Standard
LT16 THK LT16, D=31mm L=50mm medium-torque, CT=31.4N·m C0T=34.3N·m | Model: LT16 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 31 mm | Length L: 50 mm | Keyway Width b: 3.5 mm (H8) | Keyway Depth t: 2.0 mm | Ball Rows: 6 | Dynamic Torque CT: 31.4 N·m | Static Torque C0T: 34.3 N·m | Dynamic Load C: 7.06 kN | Static Load C0: 12.6 kN | Static Moment MA1: 67.6 N·m | Nut Mass: 165.0 g | Shaft Mass: 1.6 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT20 THK LT20, D=35mm L=63mm medium-torque, CT=56.9N·m C0T=55.9N·m | Model: LT20 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 35 mm | Length L: 63 mm | Keyway Width b: 4 mm (H8) | Keyway Depth t: 2.5 mm | Ball Rows: 6 | Dynamic Torque CT: 56.9 N·m | Static Torque C0T: 55.9 N·m | Dynamic Load C: 10.2 kN | Static Load C0: 17.8 kN | Static Moment MA1: 118.0 N·m | Nut Mass: 225.0 g | Shaft Mass: 2.5 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT25 THK LT25, D=42mm L=71mm medium-torque, CT=105.0N·m C0T=103.0N·m | Model: LT25 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 42 mm | Length L: 71 mm | Keyway Width b: 4 mm (H8) | Keyway Depth t: 2.5 mm | Ball Rows: 6 | Dynamic Torque CT: 105.0 N·m | Static Torque C0T: 103.0 N·m | Dynamic Load C: 15.2 kN | Static Load C0: 25.8 kN | Static Moment MA1: 210.0 N·m | Nut Mass: 335.0 g | Shaft Mass: 3.9 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT30 THK LT30, D=47mm L=80mm medium-torque, CT=171.0N·m C0T=148.0N·m | Model: LT30 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 47 mm | Length L: 80 mm | Keyway Width b: 4 mm (H8) | Keyway Depth t: 2.5 mm | Ball Rows: 6 | Dynamic Torque CT: 171.0 N·m | Static Torque C0T: 148.0 N·m | Dynamic Load C: 20.5 kN | Static Load C0: 34.0 kN | Static Moment MA1: 290.0 N·m | Nut Mass: 375.0 g | Shaft Mass: 5.6 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT40 THK LT40, D=64mm L=100mm medium-torque, CT=419.0N·m C0T=377.0N·m | Model: LT40 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 64 mm | Length L: 100 mm | Keyway Width b: 6 mm (H8) | Keyway Depth t: 3.5 mm | Ball Rows: 6 | Dynamic Torque CT: 419.0 N·m | Static Torque C0T: 377.0 N·m | Dynamic Load C: 37.8 kN | Static Load C0: 60.5 kN | Static Moment MA1: 687.0 N·m | Nut Mass: 1.00 kg | Shaft Mass: 9.9 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT50 THK LT50, D=80mm L=125mm medium-torque, CT=842.0N·m C0T=769.0N·m | Model: LT50 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 80 mm | Length L: 125 mm | Keyway Width b: 8 mm (H8) | Keyway Depth t: 4.0 mm | Ball Rows: 6 | Dynamic Torque CT: 842.0 N·m | Static Torque C0T: 769.0 N·m | Dynamic Load C: 60.9 kN | Static Load C0: 94.5 kN | Static Moment MA1: 1340.0 N·m | Nut Mass: 1.95 kg | Shaft Mass: 15.5 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT60 THK LT60, D=90mm L=140mm medium-torque, CT=1220.0N·m C0T=1040.0N·m | Model: LT60 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 90 mm | Length L: 140 mm | Keyway Width b: 12 mm (H8) | Keyway Depth t: 5.0 mm | Ball Rows: 6 | Dynamic Torque CT: 1220.0 N·m | Static Torque C0T: 1040.0 N·m | Dynamic Load C: 73.5 kN | Static Load C0: 111.7 kN | Static Moment MA1: 1600.0 N·m | Nut Mass: 2.50 kg | Shaft Mass: 22.3 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT80 THK LT80, D=120mm L=160mm medium-torque, CT=2310.0N·m C0T=1920.0N·m | Model: LT80 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 120 mm | Length L: 160 mm | Keyway Width b: 16 mm (H8) | Keyway Depth t: 6.0 mm | Ball Rows: 6 | Dynamic Torque CT: 2310.0 N·m | Static Torque C0T: 1920.0 N·m | Dynamic Load C: 104.9 kN | Static Load C0: 154.8 kN | Static Moment MA1: 2510.0 N·m | Nut Mass: 4.68 kg | Shaft Mass: 39.6 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT100 THK LT100, D=150mm L=185mm medium-torque, CT=3730.0N·m C0T=3010.0N·m | Model: LT100 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 150 mm | Length L: 185 mm | Keyway Width b: 20 mm (H8) | Keyway Depth t: 7.0 mm | Ball Rows: 6 | Dynamic Torque CT: 3730.0 N·m | Static Torque C0T: 3010.0 N·m | Dynamic Load C: 136.2 kN | Static Load C0: 195.0 kN | Static Moment MA1: 3400.0 N·m | Nut Mass: 9.55 kg | Shaft Mass: 61.8 kg/m | Options: High-temp (metal retainer, ≤100°C)
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15 product codes available in this family
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THK LT Ball Spline Nut (Medium-Torque, Cylindrical with Keyway)

Brand THK·Ball Splines

Available part numbers (15)

LT4, LT5, LT6, LT8, LT10, LT13, LT16, LT20, LT25, LT30 + 5 more — see full table ↓

How to order

Send the THK part numbers and quantities through our RFQ form or to info@prosourcemro.com. We confirm price, availability and lead time within 1 business day — no account needed.

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Product codes & specifications
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Product codeSpec
LT4THK LT4, D=10mm L=16mm medium-torque, CT=0.59N·m C0T=0.78N·m | Model: LT4 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 10 mm | Length L: 16 mm | Keyway Width b: 2 mm (H8) | Keyway Depth t: 1.2 mm | Ball Rows: 4 | Dynamic Torque CT: 0.59 N·m | Static Torque C0T: 0.78 N·m | Dynamic Load C: 0.44 kN | Static Load C0: 0.61 kN | Static Moment MA1: 0.88 N·m | Nut Mass: 5.2 g | Shaft Mass: 0.1 kg/m | Options: ⚠️ No retainer — do NOT remove nut from shaft
LT5THK LT5, D=12mm L=20mm medium-torque, CT=0.88N·m C0T=1.37N·m | Model: LT5 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 12 mm | Length L: 20 mm | Keyway Width b: 2.5 mm (H8) | Keyway Depth t: 1.2 mm | Ball Rows: 4 | Dynamic Torque CT: 0.88 N·m | Static Torque C0T: 1.37 N·m | Dynamic Load C: 0.66 kN | Static Load C0: 0.88 kN | Static Moment MA1: 1.5 N·m | Nut Mass: 9.1 g | Shaft Mass: 0.15 kg/m | Options: ⚠️ No retainer — do NOT remove nut from shaft
LT6THK LT6, D=14mm L=25mm medium-torque, CT=0.98N·m C0T=1.96N·m | Model: LT6 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 14 mm | Length L: 25 mm | Keyway Width b: 2.5 mm (H8) | Keyway Depth t: 1.2 mm | Ball Rows: 4 | Dynamic Torque CT: 0.98 N·m | Static Torque C0T: 1.96 N·m | Dynamic Load C: 1.18 kN | Static Load C0: 2.16 kN | Static Moment MA1: 4.9 N·m | Nut Mass: 17.0 g | Shaft Mass: 0.23 kg/m | Options: Standard
LT8THK LT8, D=16mm L=25mm medium-torque, CT=1.96N·m C0T=2.94N·m | Model: LT8 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 16 mm | Length L: 25 mm | Keyway Width b: 2.5 mm (H8) | Keyway Depth t: 1.2 mm | Ball Rows: 4 | Dynamic Torque CT: 1.96 N·m | Static Torque C0T: 2.94 N·m | Dynamic Load C: 1.47 kN | Static Load C0: 2.55 kN | Static Moment MA1: 5.9 N·m | Nut Mass: 18.0 g | Shaft Mass: 0.4 kg/m | Options: Standard
LT10THK LT10, D=21mm L=33mm medium-torque, CT=3.92N·m C0T=7.84N·m | Model: LT10 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 21 mm | Length L: 33 mm | Keyway Width b: 3 mm (H8) | Keyway Depth t: 1.5 mm | Ball Rows: 4 | Dynamic Torque CT: 3.92 N·m | Static Torque C0T: 7.84 N·m | Dynamic Load C: 2.84 kN | Static Load C0: 4.9 kN | Static Moment MA1: 15.7 N·m | Nut Mass: 50.0 g | Shaft Mass: 0.62 kg/m | Options: Standard
LT13THK LT13, D=24mm L=36mm medium-torque, CT=5.88N·m C0T=10.8N·m | Model: LT13 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 24 mm | Length L: 36 mm | Keyway Width b: 3 mm (H8) | Keyway Depth t: 1.5 mm | Ball Rows: 4 | Dynamic Torque CT: 5.88 N·m | Static Torque C0T: 10.8 N·m | Dynamic Load C: 3.53 kN | Static Load C0: 5.78 kN | Static Moment MA1: 19.6 N·m | Nut Mass: 55.0 g | Shaft Mass: 1.1 kg/m | Options: Standard
LT16THK LT16, D=31mm L=50mm medium-torque, CT=31.4N·m C0T=34.3N·m | Model: LT16 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 31 mm | Length L: 50 mm | Keyway Width b: 3.5 mm (H8) | Keyway Depth t: 2.0 mm | Ball Rows: 6 | Dynamic Torque CT: 31.4 N·m | Static Torque C0T: 34.3 N·m | Dynamic Load C: 7.06 kN | Static Load C0: 12.6 kN | Static Moment MA1: 67.6 N·m | Nut Mass: 165.0 g | Shaft Mass: 1.6 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT20THK LT20, D=35mm L=63mm medium-torque, CT=56.9N·m C0T=55.9N·m | Model: LT20 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 35 mm | Length L: 63 mm | Keyway Width b: 4 mm (H8) | Keyway Depth t: 2.5 mm | Ball Rows: 6 | Dynamic Torque CT: 56.9 N·m | Static Torque C0T: 55.9 N·m | Dynamic Load C: 10.2 kN | Static Load C0: 17.8 kN | Static Moment MA1: 118.0 N·m | Nut Mass: 225.0 g | Shaft Mass: 2.5 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT25THK LT25, D=42mm L=71mm medium-torque, CT=105.0N·m C0T=103.0N·m | Model: LT25 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 42 mm | Length L: 71 mm | Keyway Width b: 4 mm (H8) | Keyway Depth t: 2.5 mm | Ball Rows: 6 | Dynamic Torque CT: 105.0 N·m | Static Torque C0T: 103.0 N·m | Dynamic Load C: 15.2 kN | Static Load C0: 25.8 kN | Static Moment MA1: 210.0 N·m | Nut Mass: 335.0 g | Shaft Mass: 3.9 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT30THK LT30, D=47mm L=80mm medium-torque, CT=171.0N·m C0T=148.0N·m | Model: LT30 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 47 mm | Length L: 80 mm | Keyway Width b: 4 mm (H8) | Keyway Depth t: 2.5 mm | Ball Rows: 6 | Dynamic Torque CT: 171.0 N·m | Static Torque C0T: 148.0 N·m | Dynamic Load C: 20.5 kN | Static Load C0: 34.0 kN | Static Moment MA1: 290.0 N·m | Nut Mass: 375.0 g | Shaft Mass: 5.6 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT40THK LT40, D=64mm L=100mm medium-torque, CT=419.0N·m C0T=377.0N·m | Model: LT40 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 64 mm | Length L: 100 mm | Keyway Width b: 6 mm (H8) | Keyway Depth t: 3.5 mm | Ball Rows: 6 | Dynamic Torque CT: 419.0 N·m | Static Torque C0T: 377.0 N·m | Dynamic Load C: 37.8 kN | Static Load C0: 60.5 kN | Static Moment MA1: 687.0 N·m | Nut Mass: 1.00 kg | Shaft Mass: 9.9 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT50THK LT50, D=80mm L=125mm medium-torque, CT=842.0N·m C0T=769.0N·m | Model: LT50 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 80 mm | Length L: 125 mm | Keyway Width b: 8 mm (H8) | Keyway Depth t: 4.0 mm | Ball Rows: 6 | Dynamic Torque CT: 842.0 N·m | Static Torque C0T: 769.0 N·m | Dynamic Load C: 60.9 kN | Static Load C0: 94.5 kN | Static Moment MA1: 1340.0 N·m | Nut Mass: 1.95 kg | Shaft Mass: 15.5 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT60THK LT60, D=90mm L=140mm medium-torque, CT=1220.0N·m C0T=1040.0N·m | Model: LT60 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 90 mm | Length L: 140 mm | Keyway Width b: 12 mm (H8) | Keyway Depth t: 5.0 mm | Ball Rows: 6 | Dynamic Torque CT: 1220.0 N·m | Static Torque C0T: 1040.0 N·m | Dynamic Load C: 73.5 kN | Static Load C0: 111.7 kN | Static Moment MA1: 1600.0 N·m | Nut Mass: 2.50 kg | Shaft Mass: 22.3 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT80THK LT80, D=120mm L=160mm medium-torque, CT=2310.0N·m C0T=1920.0N·m | Model: LT80 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 120 mm | Length L: 160 mm | Keyway Width b: 16 mm (H8) | Keyway Depth t: 6.0 mm | Ball Rows: 6 | Dynamic Torque CT: 2310.0 N·m | Static Torque C0T: 1920.0 N·m | Dynamic Load C: 104.9 kN | Static Load C0: 154.8 kN | Static Moment MA1: 2510.0 N·m | Nut Mass: 4.68 kg | Shaft Mass: 39.6 kg/m | Options: High-temp (metal retainer, ≤100°C)
LT100THK LT100, D=150mm L=185mm medium-torque, CT=3730.0N·m C0T=3010.0N·m | Model: LT100 | Type: LT Ball Spline Nut, Medium-Torque | OD D: 150 mm | Length L: 185 mm | Keyway Width b: 20 mm (H8) | Keyway Depth t: 7.0 mm | Ball Rows: 6 | Dynamic Torque CT: 3730.0 N·m | Static Torque C0T: 3010.0 N·m | Dynamic Load C: 136.2 kN | Static Load C0: 195.0 kN | Static Moment MA1: 3400.0 N·m | Nut Mass: 9.55 kg | Shaft Mass: 61.8 kg/m | Options: High-temp (metal retainer, ≤100°C)

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