ActionJac 1HL-BSJ-DC 20:1

Inch Worm Gear Ball Screw Jack, Double Clevis, 1 Ton Capacity, 20:1 Gear Ratio, Screw Lead 0.5"

Double Clevis Jacks are used when it is necessary to move a load through an arc, such as tracking antennas, hinged doors or air dampers. One clevis is mounted on the end of the lift shaft and the other clevis is welded to a heavy duty stem cover, which is welded to the housing. Depending on size, Double clevis designs are available with optional accessories such as boots, motor mounts, right-angle reducers, motors, encoders and rotary limit switches.


Mounting hardware for double clevis jacks should be specified as heat treated alloy steel clevis pins with at least 100,000 psi ultimate tensile strength.

Double clevis jacks used horizontally will have reduced column strength and life. For most horizontal applications, Nook recommends the use of an Electric Cylinder (contact Nook Engineering for more information).

To configure a part number, download 2D/3D models, or request a quote, please select the "Quote or Download" tab and click the "Configure" button. (Step 4 of 4)

Product ActionJac 1HL-BSJ-DC 20:1
Capacity [Ton] 1
Gear Ratio 20:1
Turns of Worm per Inch Travel 40
Torque to Raise 1 lb. [in-lb] 0.0114
Torque to Raise 1 lb. Keyed [in-lb] 0.0125
Lifting Screw Diameter [in] 0.75
Screw Lead [in] 0.500
Root Diameter [in] 0.602
BackDrive Holding Torque [ft-lb] 1.5
Tare Drag Torque [in-lb] 3
Performance Specifications
Maximum Allowable Input [hp] 0.25
Maximum Input Torque [in-lb] 9
Maximum Worm Speed at Rated Load Non-keyed [rpm] 691
Maximum Worm Speed at Rated Load Keyed [rpm] 628
Maximum Load at 1750 RPM Non-keyed [lb] 790
Maximum Load at 1750 RPM Keyed [lb] 718
Starting Torque 1.5 x Running Torque
Base 0 Travel [lb] 8
Per Inch of Travel [lb] 0.04
Grease [lb] 0.5

To continue, please configure your item below.

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