• The total length is 125 mm shorter and the weight is 7 kg lighter than the conventional type. Furthermore, offers a mis-operation prevention mechanism where the hydraulic and manual switch is toothed.
  • Made of ductile cast iron, minimizing bending and breakage during tightening.
  • Sliding parts have been flame heat treated (HRC45) and offer excellent wear resistance.
  • The hydraulic pump is finished as a pump that is capable of powerful clamping with low trouble from over 3, operational tests.
  • The optimal jaw opening from 3 positions is obtained by adjusting the position where opening and closing starts.
  • High accuracy that surpasses the former JIS standards grade.

Special Mounting bolt set – Compatible T-slot width 18 mm … 2 sets
Standard guide block (2 pieces per set) compatible groove width 18 mm … 1 set
Handle … 1 piece

Clamping Method

(1) Clamping method by hydraulic pressure

・With the matching parts of the switching collar and socket separated, rotate the handle in the clockwise direction.
・The jaw plates touch the workpiece, and the internal clutch engages with a clamping force of approximately 10 kN.
・After the clutch has engaged, only the handle and socket rotate, and the hydraulic clamping operation is performed.
・Clamping force and handle operation (after the clutch is engaged)




Handle Operation 3 marking lines (Rotation) 1 2 3 4
Clamping Force (kN) 12 20 30 40

・The clamping stroke by hydraulic pressure is approximately 1.8 mm.


(2) Clamping method by screw

・Slide the switching collar towards the socket side, and with the switching collar and socket interlocked, rotate the handle in the clockwise direction.
(While interlocked, the clutch does not operate).
・Clamping by screw has a maximum of approximately 10 kN.

(3) Combination of clamping by screw and clamping by hydraulic pressure

・When clamping workpieces that deform easily and workpieces where the workpiece surface is a cast surface, perform clamping using the screw and then perform clamping using hydraulic pressure.
・Perform the clamping operation by screw as shown in (2) and then perform clamping by hydraulic pressure as shown in (1).
・The clamping force is (clamping force by screw) + (clamping force by hydraulic pressure).
・For workpieces where large deformation may occur, check that the workpiece is securely fixed after clamping.


Parts Details


When ordering parallel productsA and B align within 0.01 no matter how many pieces

Order multi-jaw specification products (suffix G)
When ordering, specify the groove width of the machine you are using.
Can only be manufactured when newly purchasing Matched specification products.





Accuracy Standards (Static Accuracy)

No Inspection Points (per 100 mm) Former
JIS Standard
(O Grade)
1 Parallelism between bottom surface of main body and sliding surface 0.015 0.010
2 Perpendicularity between jaw plate and sliding surface (smaller than right angle) 0.030 0.015
3 Perpendicularity between T-slot and jaw plate surface of stationary jaw side. 0.015 0.015
4 Parallelism between T-slot and jaw plate surface of stationary jaw side. 0.015 0.015
(Clamping Accuracy)
5 Parallelism between top surface of clamped test block and bottom surface of main body 0.020 0.015
6 Lift-up of top surface of test block when clamped 0.030 0.015
No. Jaw Width Jaw Depth Jaw Opening Standard Guide Block Width Clamping Force kN Weight (kg)
LTH3P150S 156 57 300 18 40 41
LTH3P150SG 156 57 300 18 40 41


Hydraulic Unit

Compatible Models