Pneumatic Grippers

Single acting pneumatic grippers are ideal for large or small parts with weight ranging from 2 – 500 lbs. Our line of custom STD-G (“Gripper”) series of grippers are an excellent choice for end-effectors on robots, manipulators or cranes.

The STD-G series of products are a family of lightweight, high-moment capacity pneumatic grippers. The grippers are single acting meaning, there is one stationary and one moving jaw.

Our grippers use high quality, re-circulating rail type linear bearings to support the moving jaw. Many competing solutions rely on telescoping sliders to support the moving jaw(s); these support substantially lower load at full stroke than when at minimum stroke. As a consequence, telescoping sliders cannot grip a part as far out from the gripper bodies as our grippers can.

Pneumatic Gripper Features and Benefits

All grippers are equipped with a standard pilot-operated (PO) check valve in one port. This valve serves a critical function in ensuring the reliability and safety of the gripper’s operation. In the unlikely event of a pneumatic failure, the PO check valve will trap air, thereby preventing any loss of grip from the gripper’s jaws.

This feature guarantees the secure handling of the gripped material, reducing the risk of accidents or damages. A crucial aspect of its design and operation, this PO valve provides an extra layer of protection.

High moment capacity, part can be held a great distance from the gripper
Ideal for Robots, Manipulators, and Cranes
Adjustable hard-stop to allow fine tuning of gripper stroke
In the event of air failure, the jaws will remain gripped
Integral sensor used to notify operators of a successful grip.
High quality re-circulating ball, linear rail bearings (THK)
High quality double acting cylinders (SMC)
Lightweight anodized aluminum chassis
Many possible mounting arrangements
Additional screw locations on gripper side plates for guarding or mounting.

Technical Specifications

In order to size pneumatic grippers, a grip moment must be calculated. The grip moment is calculated through the following equation:

= (grip force x distance from point of contact to center of cylinder)

The tables and technical specifications sheets for each of the four gripper models provide the grip force and moment rating as referenced in the formulas.

Detailed Design Specs

Name	Stroke	Grip Force (@100psi)	Max Pressure	Weight	Jaw Moment Rating
G24	3.9″	160 lbf	120 psi	10 lbf	2000 in-lbf
G31	1.4″	255 lbf	120 psi	7 lbf	3000 in-lbf
G46	5.9″	255 lbf	120 psi	18 lbf	4600 in-lbf
G54	3.9″	435 lbf	120 psi	20 lbf	5000 in-lbf
G56	5.9″	435 lbf	120 psi	23 lbf	5000 in-lbf

Pneumatic Gripper Mounting Configurations

HORIZONTAL MOUNTING

JAW MOMENT = GRIP FORCE x L2
MOMENT ‘A’ = (LOAD x L1) + (JAW SELF WEIGHT x JAW CENTER OF GRAVITY (FROM CYLINDER))

VERTICAL MOUNTING

JAW MOMENT = (GRIP FORCE+LOAD) x L2
MOMENT ‘B’ = (LOAD x L1) + (JAW SELF WEIGHT x JAW CENTER OF GRAVITY (FROM CYLINDER))

DOWNWARD FACING

If the gripper is to be used to lift a load vertically while facing the ground, and the part is held by friction only, then normally only the jaw moment needs to be calculated: JAW MOMENT = GRIP FORCE x L2.

If the load is held mechanically, the combined bending and normal loading on the linear bearing will need to be calculated.

Get In Touch