The FESTO 185698 HGWM-08-EZ-G8 is a micro angle gripper engineered for compact pneumatic handling tasks where installation space is limited but repeatable gripping performance is still required. It belongs to FESTO’s HGWM series, a family designed for miniature automation assemblies, light-duty part handling, and precise motion in small-format equipment. Official FESTO product data identifies this model as HGWM-08-EZ-G8, size 8, with a maximum opening angle of 14°, product weight of 13 g, M3 pneumatic connection, and clamped mounting style.
Unlike larger industrial grippers built for heavy parts and wide jaw travel, the HGWM-08-EZ-G8 is aimed at tasks where compactness, low moving mass, and simple integration are more important than brute gripping force. That makes it relevant for electronics assembly, light packaging operations, miniature handling modules, laboratory automation, and other systems that require controlled gripping in restricted spaces. FESTO describes the HGWM family as a micro gripper for very tight installation spaces, available in sizes 8 and 12, which confirms its positioning as a miniature pneumatic gripping solution rather than a general-purpose heavy-duty unit.
Key Technical Data
| Item | Specification |
|---|---|
| Brand | FESTO |
| Part Number | 185698 |
| Model | HGWM-08-EZ-G8 |
| Product Type | Angle gripper |
| Series | HGWM |
| Size | 8 |
| Mode of Operation | Single-acting |
| Gripper Function | Closed |
| Number of Gripper Jaws | 2 |
| Maximum Opening Angle | 14° |
| Pneumatic Connection | M3 |
| Product Net Weight | 13 g |
| Type of Mounting | Clamped |
| Housing Material | High-alloy stainless steel |
| Gripper Jaw Material | High-alloy steel |
| Cover Cap Material | POM |
| Compliance | RoHS-compliant |
The table above is based on official FESTO product information and FESTO technical documentation for the HGWM series and the specific part number 185698.
Product Design and Operating Principle
The HGWM-08-EZ-G8 uses a wedge-shaped drive and a single-acting operating principle, both of which are characteristic of the HGWM family. In practice, this means the gripper is designed to perform a defined angular jaw movement using pneumatic actuation, while spring return supports its reset behavior. FESTO’s technical documentation for the HGWM series lists the constructional design as wedge-shaped drive, with angle gripper function and two gripper jaws.
The “EZ” configuration indicates a closed gripper function, and FESTO lists the maximum opening angle for the HGWM-08-EZ-G8 as 14°. This is important because the opening angle directly affects how the gripper interacts with small parts. A controlled angular opening is often preferable in compact automation when the workpiece does not require a large jaw stroke but does require repeatable pick-and-place action. The angular motion also helps reduce the installation footprint compared with larger parallel grippers that may need more body length or more complex guide structures.
Why This Model Is Suitable for Compact Automation
The strongest commercial and engineering advantage of the HGWM-08-EZ-G8 is not one dramatic specification. It is the combination of very small size, light 13 g weight, stainless-steel body construction, and micro-gripper geometry. In compact automation design, low component mass matters. A gripper that weighs only 13 g places minimal load on small slides, miniature linear axes, rotary modules, and lightweight robot end effectors. That can support higher cycle efficiency, reduced inertia, and easier mechanical integration.
Its clamped mounting design is also significant. The “G8” variant in FESTO’s HGWM documentation corresponds to the version with clamping shaft, which is intended for straightforward mechanical integration into compact assemblies. This style can be useful when the designer wants a simple and secure installation method in a small fixture or machine module. FESTO’s dimensional documentation clearly lists the HGWM-08-EZ-G8 under the “with clamping shaft” configuration.
Materials and Durability
FESTO lists the housing material of the HGWM-08-EZ-G8 as high-alloy stainless steel, with high-alloy steel for the gripper jaws and POM for the cover cap. That material selection tells you this is not a low-end plastic micro gripper intended only for demonstration equipment. Stainless-steel construction gives the product better structural rigidity and corrosion resistance than many lightweight alternatives. The steel jaws also support stable contact behavior in repeated gripping cycles, especially in precision applications involving small mechanical parts. FESTO additionally states that the product is RoHS-compliant.
From a buyer’s perspective, this material combination matters because small grippers are often used in systems where dimensional stability and clean repeated motion are more important than raw force. In such environments, body stiffness and wear resistance can have a bigger impact on long-term performance than absolute gripping torque alone. The HGWM-08-EZ-G8 appears positioned accordingly: compact, rigid, and intended for precision-oriented miniature handling. That is a reasonable inference from the official construction and material data.
Motion Characteristics and Precision-Oriented Use
Official FESTO product data for the HGWM-08-EZ-G8 lists maximum angular gripper jaw backlash ax, ay of 0.5°, maximum gripper jaw backlash Sz of 0.03 mm, and repetition accuracy of the gripper of ≤0.02 mm. Those figures are relevant because they indicate the product is intended for applications where repeatability matters. A miniature gripper with weak repeatability is rarely useful in automated assembly. By contrast, the published values for this model suggest it is suitable for consistent handling of small parts where positional stability is necessary.
FESTO’s older HGWM documentation also identifies the series as a micro angle gripper, again reinforcing the product’s intended use in tight-space handling rather than broad-stroke gripping. In real machine-building terms, that means the HGWM-08-EZ-G8 is best considered for parts that are small, relatively light, and geometrically suited to angular jaw gripping. It is not the right product for bulky or high-mass workpieces, but it is a logical choice for compact handling points inside finely packaged automation equipment.
Typical Application Areas
| Application Area | Reason It Fits |
|---|---|
| Electronics assembly | Small size and precise gripping behavior |
| Miniature handling modules | Low weight and compact installation |
| Laboratory automation | Controlled pneumatic movement in tight spaces |
| Light packaging systems | Suitable for small components and compact stations |
| Precision assembly fixtures | Repeatable jaw motion and micro-gripper format |
These applications are consistent with the FESTO description of the HGWM family as a micro gripper for very tight installation spaces and with the technical characteristics published for the model.
Installation and Integration Considerations
The HGWM-08-EZ-G8 uses an M3 pneumatic connection, which is standard for a gripper of this scale and aligns with its compact design. The small pneumatic interface helps keep tubing and overall installation size under control, which is important in dense automation assemblies. FESTO’s dimensional documentation also shows that this “G8” version uses a clamping-shaft arrangement, which can simplify mounting where panel, bracket, or micro-module space is limited.
For engineers, the main design consideration is matching the gripper to the application class. This model is optimized for small components, compact motion, and tight installation envelopes. If the workpiece is too large, too heavy, or requires wide stroke movement, a larger gripper family would be more appropriate. But when the design target is a miniature pneumatic handling head, the HGWM-08-EZ-G8 is technically aligned with that requirement. That conclusion is supported by FESTO’s own series positioning and dimensional data.
Conclusion
The FESTO 185698 HGWM-08-EZ-G8 is a specialized micro angle gripper intended for small-scale pneumatic handling tasks in restricted installation spaces. Its published specifications show a product focused on compactness and precision: 13 g product weight, size 8 format, 14° maximum opening angle, M3 pneumatic connection, clamped mounting, stainless-steel housing, and two-jaw single-acting operation. For machine builders and automation integrators working on miniature assembly, light handling, or dense modular equipment, this model is a practical and technically credible choice where compact dimensions and repeatable motion are more important than high gripping force.
