PHD Series GRM1 Miniature Workholding Clamp Review: Specs, Price and Applications
The PHD Series GRM1 is a miniature pneumatic workholding clamp with 225 lb total clamp force, weighing under 1 lb in a 45 x 45 x 120 mm envelope suited to confined spaces and robotic end effectors.
A cam mechanism keeps jaws closed if pressure is lost, it is field repairable in about 10 minutes with metric hex wrenches, accepts all GRM2 standard tips and offers four standard jaw openings.
Quick Verdict
An excellent force-to-weight clamp for robotic sheet metal tooling, with GRM2 tip compatibility.
PHD Series GRM1 Miniature Workholding Clamp at a Glance
Specification | Details |
Product type | Miniature pneumatic workholding clamp |
Total clamp force | 225 lb |
Weight | Under 1 lb |
Envelope | 45 x 45 x 120 mm |
Locking | Cam keeps jaws closed on pressure loss |
Service | Field repair in about 10 minutes |
Tips | Accepts all GRM2 standard tips |
Jaw openings | Four standard |
Price | Request a quote |
Design and Operating Principle
GRM clamps are used on press-line and body-shop tooling to clamp sheet metal edges during transfer. A pneumatic cylinder drives a cam or toggle that closes the jaw, and locking in the closed position means the panel stays clamped if air is lost.
Under 1 lb, the GRM1 adds little mass to robot tooling while delivering 225 lb, and shared GRM2 tips simplify spare parts.
Integration and Selection
Choose jaw opening and tips for the flange, mount along the panel, and add switches if needed.
Stock GRM2 tips across clamp sizes.
Industry Applications
Industry | Typical use |
Automotive | Body panel transfer |
Appliances | Panel handling |
Metal fabrication | Robot transfer tooling |
Aerospace | Sheet handling |
Functional Uses
Sheet metal clamping
Robot end effector clamping
Fail-safe locking
Quick field repair
Pros and Cons
Advantages
225 lb force
Under 1 lb
Cam locking
Shared GRM2 tips
Limitations
Opening size limits
Pneumatic supply needed
Sheet edges only
Who Should Consider the PHD Series GRM1 Miniature Workholding Clamp?
The GRM1 suits robotic sheet metal tooling.
Price and Availability
Price: Request a quote. PHD prices the GRM1 by size, options and quantity. Budget for jaw tooling, mounting, air supply, sensors and commissioning as part of the complete installation.
Further Reading
PHD Series GRM1 Miniature Workholding Clamp FAQ
What clamp force does GRM1 provide?
225 lb total.
How much does it weigh?
Under 1 lb.
What is its envelope?
45 x 45 x 120 mm.
Does it hold on air loss?
Yes, the cam keeps jaws closed.
Which tips does it accept?
All GRM2 standard tips.
How much does it cost?
Request a quote from PHD.
