Piab GSZ Spring Loaded Sprue Plier Arm Review: Specs, Price and Applications
The Piab GSZ is an inline spring-loaded arm for GRZ 20-16 part and sprue pliers. It lets the gripper absorb the mold's ejector stroke.
It is used when sprues and runner systems do not stay on the ejector pins after ejection. The arm is end ported for quick-touch pneumatic connectors and comes with a clampable shaft (C) or threaded shaft (M) with jam nut and lock washers for plate mounting.
Quick Verdict
A simple compliance element that makes sprue picking reliable by letting the gripper follow the ejector stroke instead of fighting it.
Piab GSZ Spring Loaded Sprue Plier Arm at a Glance
Specification | Details |
Product type | Spring-loaded sprue plier arm |
Compatible grippers | GRZ 20-16 part/sprue pliers |
Function | Absorbs mold ejector stroke |
Porting | End ported for quick-touch connectors |
Shaft options | Clampable (C) or threaded (M) |
Threaded mounting | Jam nut and lock washers |
Price | Request a quote |
Design and Operating Principle
When a sprue does not stay on the ejector pins, the robot must grip it while ejection happens. A rigid gripper would collide with the moving sprue or ejector plate. The GSZ spring lets the gripper move back with the ejector stroke while keeping hold.
End porting routes air through the arm so hoses do not snag, and the two shaft styles fit different EOAT frame designs.
Integration and Selection
Mount the GSZ on the EOAT frame, attach a GRZ 20-16 plier and synchronise gripping with ejection in the robot and molding machine sequence.
Choose clampable shafts for adjustable frames and threaded shafts for plate mounting.
Industry Applications
Industry | Typical use |
Injection molding | Sprue removal during ejection |
Plastics | Runner system handling |
Automotive | Molded part take-out |
Consumer goods | High-speed molding cells |
Functional Uses
Ejector stroke compensation
Sprue gripping during ejection
EOAT compliance
Hose routing
Pros and Cons
Advantages
Absorbs ejector stroke
End ported
Two shaft options
Pairs with GRZ pliers
Limitations
Specific to GRZ 20-16
No numeric spring data on A3
Molding niche
Who Should Consider the Piab GSZ Spring Loaded Sprue Plier Arm?
The GSZ suits molders whose sprues fall off ejector pins.
Price and Availability
Price: Request a quote. Piab prices GSZ arms by configuration, options and quantity. Budget for the complete solution, including mounting, vacuum or air supply, valves, sensors and commissioning, rather than the component alone.
Further Reading
Piab GSZ Spring Loaded Sprue Plier Arm FAQ
What is the GSZ?
An inline spring-loaded arm for GRZ 20-16 sprue pliers.
Why use it?
To absorb the mold ejector stroke when sprues don't stay on ejector pins.
How is air connected?
It is end ported for quick-touch connectors.
What shaft options exist?
Clampable (C) or threaded (M).
What comes with threaded shafts?
A jam nut and lock washers.
How much does it cost?
Request a quote from Piab.
