
The GRW Series Grippers are precision pneumatic grippers designed for industrial automation. Key advantages include configurable synchronous or non-synchronous jaw motion, robust large diameter jaw guides for enhanced stability and moment capacity, manifold porting options on two mounting surfaces, availability in five sizes with imperial and metric versions, fast shipping (1-2 days), and a minimum rated life of 6 million cycles.
Orders must specify product line, series, type, synchronization mode, jaw style, design number (imperial or metric mounting/dowel/port configurations), size, total jaw travel, and any options such as manifold porting location, corrosion-resistant coatings, and sensor types (Hall effect or inductive proximity switches) with part numbers and cable lengths.
| Size | Nominal Total Jaw Travel (in/mm) | Close Grip Force at 87 psi (lb/N) | Gripper Weight (lb/kg) | Close or Open Time at 87 psi (sec) | Displacement (in³/cm³) | External Grip (in/lb) | Internal Grip (in/lb) |
|---|---|---|---|---|---|---|---|
| 16 | 0.79 / 20 | 36 / 160 | 0.69 / 0.3 | 0.09 | 0.25 / 4.0 | 0.41 / 26 | 0.49 / 31 |
| 25 | 2.09 / 53 | 90 / 400 | 2.5 / 1.1 | 0.14 | 1.59 / 26 | 1.03 / 66 | 1.21 / 78 |
| 32 | 2.56 / 65 | 170 / 756 | 5.3 / 2.4 | 0.24 | 3.19 / 52 | 1.96 / 126 | 2.17 / 140 |
| 40 | 3.58 / 91 | 207 / 921 | 11.2 / 5.1 | 0.30 | 7.0 / 114 | 2.38 / 154 | 2.61 / 168 |
| 50 | 4.61 / 117 | 429 / 1908 | 22.1 / 10.0 | 0.60 | 14.0 / 229 | 4.93 / 318 | 5.49 / 354 |
Operating Pressure: 30 to 100 psi (2 to 7 bar air)
Operating Temperature: -20°F to +180°F (-28°C to +82°C)
Rated Life: Minimum 6 million cycles
Grip Repeatability: ±0.002 in (±0.05 mm)
Lubrication: Factory lubricated for rated life
Maintenance: Field repairable
Jaw tooling should be designed to position the grip point as close to the gripper body as possible to minimize applied moment and jaw friction, which reduce effective grip force. Grip Force Factor (GF) values are provided for zero tooling length. Grip force decreases as tooling length increases, illustrated by graphs for different sizes.
Grip Force Calculation:
For detailed sizing and application support, refer to the PHD Product Sizing Catalog or online tools at www.phdinc.com/apps/sizing.
Comprehensive dimensional drawings and mounting hole specifications are provided for all five sizes (16, 25, 32, 40, 50), including nominal jaw travel, closed/open positions, mounting hole sizes and locations, dowel pin holes, and port locations in both imperial and metric units. Notes clarify that unmarked holes are for manufacturing use and dimensions are reference unless toleranced.
Mounting details include threaded hole sizes, dowel pin hole tolerances, and centerline references to ensure precise installation and tooling attachment.
Two manifold porting options are available:
Replacement kits include port plugs and O-rings, with part numbers specified for each size and manifold option.
This document is a comprehensive technical reference for the Series GRW pneumatic grippers by PHD Inc., covering specifications, design features, ordering information, dimensional data, manifold porting, corrosion resistance options, sensor integration, and best practices for installation and maintenance to support industrial automation applications.
GRW LOW PROFILE WITH MINIMAL JAW PLAY U.S. PATENT #6598918 INTERNATIONAL PATENT PENDING precision hardened steel synchronizer provides long life with minimal wear bronze bearings are self-lubricating and provide superior wear resistance (size 16 bearing material is hardcoated aluminum) hardened steel pins provide minimal wear large diameter steel jaw guides supported through the length of the body allow long tooling lengths and high moment capabilities internal and external shock pads provide impact absorption and decrease noise levels jaw guides press fit into jaws for efficient, direct load transfer large assembly fasteners for rugged construction anodized aluminum jaws provide large flat surfaces and precision dowel holes for accurate tooling attachment unit may be ordered without synchronizer or field converted to non-synchronous operation for gripping off-center hall and proximity switches available for sensing jaw position manifold porting available on 2 mounting surfaces provides a narrow package with long stroke hardcoated aluminum body with precision dowel holes provides accurate gripper mounting seals are specially formulated to provide long service life Major Benefits Industry Uses Units can be ordered without synchronous jaw motion or converted in the field Large diameter jaw guides provide superior jaw stability and high moment capacities Manifold porting options Two standard mounting surfaces Five sizes available in both imperial and metric versions 1-2 day shipping 6 million cycles minimum rated life Assembly machine builders Powdered metal Bearing manufacturing Automotive Light bulb manufacturing Robotics Vehicle lighting equipment Material handling 4-43
Open the catalog to page 1SYNCHRONIZATION 0 - Non-synchronized 1 - Synchronized MANIFOLD OPTIONS L11-UB99 - Manifold option in location 99 L11-UB37 - Manifold option in location 37 UNIT OPTIONS Z1 - Corrosion resistant coating on exposed ferrous parts except for jaw guides. OPTIONS (OMIT IF NOT REQUIRED) STANDARD PORT LOCATION TYPE Wide Body Parallel 8 mm THREADED INDUCTIVE PROXIMITY SWITCHES (40 & 50 mm BORE UNITS) PART NUMBER DESCRIPTION 51422-005-02 NPN (Sink) 2 meter cable 51422-006-02 PNP (Source) 2 meter cable OPEN POSITION CLOSED POSITION TOTAL JAW TRAVEL = (OPEN POSITION - CLOSED POSITION) MANIFOLD LOCATION MANIFOLD...
Open the catalog to page 2ENGINEERING DATA: SERIES GRW GRIPPERS F= TOTAL GRIP FORCE GRIP force CALCULATION Equations: SIZING AND APPLICATION ASSISTANCE See PHD Product Sizing Catalog for specific and complete sizing information. Online sizing assistance is available at: www.phdinc.com/apps/sizing METRIC: TOTAL GRIP FORCE [N] = (Pressure [bar] x GF) x Tooling Length Factor TOTAL GRIP FORCE [lb] = (Pressure [psi] x GF ) x Tooling Length Factor TOOLING LENGTH FACTOR Tooling Length PART TOOLING LENGTH FACTOR Body Surface Jaw tooling should be designed so that the grip point is as close to the body surface as possible. As...
Open the catalog to page 3DIMENSIONS: SERIES GRW GRIPPERS DIMENSIONS SHOWN APPLY TO ALL SIZES UNLESS NOTED OTHERWISE, SEE OTHER VIEWS FOR SIZE DEPENDENT FEATURES WITH SPOTFACE 1) DESIGNATED t IS CENTERLINE OF UNIT 2) METRIC INFORMATION SHOWN IN [ ] 3) UNMARKED HOLES ARE USED FOR PHD MANUFACTURING, CONTACT PHD IF DIMENSIONAL INFORMATION IS REQUIRED 4) CIRCLED NUMBERS INDICATE POSITIONS 5) *A CLOSED REFLECTS THE LARGEST POSSIBLE CLOSED DIMENSION A OPEN REFLECTS THE SMALLEST POSSIBLE OPEN DIMENSION All dimensions are reference only unless specifically toleranced. SOLUTIONS FOR INDUSTRIAL AUTOMATION
Open the catalog to page 4MOUNTING DIMENSIONS: SERIES GRW GRIPPERS All dimensions are reference only unless specifically toleranced. SOLUTIONS FOR INDUSTRIAL AUTOMATION
Open the catalog to page 5OPTIONS: SERIES GRW GRIPPERS L11-UB99 With this option the gripper is configured for manifold mounting on one of the two standard mounting surfaces, according to the selected option code. The standard ports are plugged. O-ring seals are provided for mounting between the gripper and the manifold. MANIFOLD REPLACEMENT KIT NUMBER SIZE 32 SIZE 25 SIZE 16 TYPE SIZE 40 65709-32-1-1 65709-25-1-1 IMPERIAL 65709-16-1-1 65709-40-1-1 65709-32-5-1 65709-25-5-1 65709-16-5-1 METRIC 65709-40-5-1 Manifold kit includes port plugs and o-rings. MANIFOLD OPTION L11-UB99 MANIFOLD OPTION L11-UB37 FOR CUSTOMER USE...
Open the catalog to page 6ACCESSORIES: SERIES GRW GRIPPERS PROXIMITY SWITCH KIT This kit equips the gripper with brackets to provide for the mounting of up to two 4 mm round proximity switches. Proximity switches must be ordered separately. See Switches and Sensors section for complete switch specifications. PROXIMITY SWITCH MOUNTING KITS KIT NUMBER SIZE STANDARD PLATING -Z1 PLATING 16 65710-16-20 68465-16-20 25 65710-25-53 68465-25-53 32 65710-32-65 68465-32-65 40 68457-40-91 68466-40-91 50 68457-50-117 68466-50-117 4 mm ROUND INDUCTIVE PROXIMITY PART NUMBER SWITCHES DESCRIPTION 18430-001-02 NPN (Sink) 2 meter cable...
Open the catalog to page 7ACCESSORIES: SERIES GRW GRIPPERS HALL EFFECT SWITCH KIT This kit equips the gripper with brackets to provide for the mounting of up to two 6 mm square Hall Effect switches. Hall Effect switches must be ordered separately. 6 mm SQUARE HALL EFFECT SWITCHES PART NUMBER COLOR DESCRIPTION 55803-1-02 Yellow NPN (Sink) 4.5-24 VDC, 2 meter cable 55804-1-02 Red PNP (Source) 4.5-24 VDC, 2 meter cable 55823-1 Yellow NPN (Sink) 4.5-24 VDC, Quick Connect 55824-1 Red PNP (Source) 4.5-24 VDC, Quick Connect HALL EFFECT SWITCH MOUNTING KITS KIT NUMBER SIZE STANDARD PLATING -Z1 PLATING 16 68446-16-20 68467-16-20...
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