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JTB Screw Jacks Selection Guide


Example Model: (1)JTB-5T  -  (2)US  -  (3)500  -  (4)H  -  (5)II  -  (6)C  -  (7)PP

(1). Sizes
JTB-1T, JTB-2.5T, JTB-5T, JTB-10T, JTB-15T, JTB-20T, JTB-25T, JTB-35T.
Note: click your required model website directly, there are specifications tables (
bottom position) and assembly drawings for your reference.
 
(2). Configuration and Designs
US = Upright Translating Screw Design      IS = Inverted Translating Screw Design
UK = Upright Anti-Rotation Screw Design   IK = Inverted Anti-Rotation Screw Design
UR = Upright Rotating Screw Design          IR = Inverted Rotating Screw Design
Note: The ball screw of a translating screw design jack must be attached to the load (guided) which prevents the ball screw from rotating. Add linear guides, rails or rolls are recommended.
Note: If your application involves a load which is unattached, unguided or the load is free to rotate and not translate, then a anti-rotation screw design jack are required to prevent ball screw rotation. For ball screw jack with anti-rotation device which are supplied with a square nut on the lifting ball screw's end, inside a square cover pipe.


(3). Stroke (mm)
There are no standard travel length and all screw jacks travel length are built with customers required. 
Note: If compressive loads, must consider the lead screw permissible buckling load.

(4). Gear Ratios
Model H:
High Ratio
Stroke (mm),
Per Turn of Input Shaft
L:
Slow Ratio
Stroke (mm),
Per Turn of Input Shaft
JTB-1T 1/6 0.83 1/24 0.21
JTB-2.5T 1/6 0.83 1/24 0.21
JTB-5T 1/6 1.67 1/24 0.42
JTB-10T 1/8 1.25 1/24 0.42
JTB-15T 1/8 1.25 1/24 0.42
JTB-20T 1/8 1.5 1/24 0.5
JTB-25T 1/10.667 1.5 1/32 0.5
JTB-35T 1/10.667 1.875 1/32 0.625

(5). Screw End Conditions
Standard lead screw end conditions include I=top plate, II=clevis end, III=plain end, IV=threaded end, VI=fork end, VII=rod end, and no screw end with full threads lead screw.


(6). Worm (Input Shaft) Types & Motor Flange Input Types
A=Left side shaft          B=Right side shaft          C=Double input shaft
M1= Left side shaft, Right side motor flange   
M2= Right side motor flange
M3= Right side shaft, Left side motor flange   
M4= Left side motor flange
Note: Motor flange input types, if need to purchase the motor from us, your purchase orders must be marked. Otherwise, we only sale screw jack with motor flange.


(7). Accessories
Screw jacks with a comprehensive range of accessories like FC=Flex couplings, UJ=Universal joints, TUJ=Telescopic universal joints, CS=Connecting shafts, HW=Hand wheels, PB=Pillow blocks, FB=Flange blocks, RE=Rod ends, LSB=Linear shafts and bearings, LGB=Linear guides and bearings, TSC=Telescopic spring covers, BB=Bellows boot, PP=Protection tubes, TAP=Trunnion adapter plates, TMB=Trunnion mounting brackets, MF=Motor flanges, WGR=Worm gear speed reducers, HGR=Helical gear reducers, EM=Single phase or three phase induction motors, STM=Stepper motors, SEM=Servo motors, DCGM=DC geared motors, REN=Rotary encoders, LS=Travel limit switches, FIN=Frequency inverters, PIN=Position indicators, SN=Stop nuts, TN=Travel nuts, SNU=Safety nuts.

Warning:
1. Input RPM should not exceed 1500 RPM.
2. Never exceed the screw jacks static and dynamic capacity.
3. Never exceed the power listed in our screw jacks specification tables. If the maximum power recommendation is exceeded, reduce the speed, use a larger capacity screw jacks, choose another screw jacks ratio, or consider a more efficient screw jack.

Sample Part Number

JTB Series - US - 300 - H - II - C - PP