The SMC MHZ2-6C1 is a compact parallel type air gripper designed for precise gripping, stable centering, and repeatable handling in compact automation systems. It belongs to SMC’s MHZ2 Series, a family of parallel grippers built around a guide-integrated structure intended to deliver higher rigidity and better accuracy than a simple finger-actuated mechanism. In the official SMC documentation for the 6 mm model, the MHZ2 platform is specified as a parallel air gripper using compressed air, with 6 mm bore size, 4 mm open/close stroke on both sides, ±0.01 mm repeatability, and 180 cycles per minute maximum operating frequency. The same documentation lists the weight as 27 g, excluding the weight of any optional auto switch.
For the specific code MHZ2-6C1, the “C” designation corresponds to a single-acting, normally closed version in SMC’s order system, while the “1” finger option is associated with side tapped mounting. Distributor and configurator references for this exact part number also describe it as a single-acting normally closed, standard side-tapped model. In practical terms, that means the gripper is intended for applications where a normally closed gripping condition is preferred, especially when designers want a compact two-finger unit for small workpieces, indexing tasks, light assembly, or part retention during pneumatic operation.
Technical Summary
| Item | Specification |
|---|---|
| Brand | SMC |
| Model | MHZ2-6C1 |
| Product Type | Parallel Type Air Gripper |
| Series | MHZ2 Series |
| Bore Size | 6 mm |
| Operating Method | Single-acting, normally closed |
| Finger Style | Standard side tapped mounting |
| Fluid | Compressed air |
| Operating Pressure | 0.3 to 0.7 MPa |
| Ambient and Fluid Temperature | -10 to 60°C |
| Repeatability | ±0.01 mm |
| Maximum Operating Frequency | 180 c.p.m. |
| Open/Close Stroke | 4 mm (both sides) |
| Effective Gripping Force per Finger | 3.7 N (internal gripping, at 0.5 MPa, gripping point L = 20 mm) |
| Auto Switch | Base code without switch suffix; catalog notes built-in magnet for no-switch code |
| Product Net Weight | 27 g (excluding auto switch) |
The values above are based on SMC’s official specification and operation manual for the 6 mm MHZ2 platform, together with the order-configuration references for the MHZ2-6C1 code.
Compact Design with Practical Mechanical Advantages
One of the main reasons engineers choose the SMC MHZ2-6C1 is not simply because it is small, but because it offers a useful balance between compact size, guided movement, and stable gripping behavior. In many pneumatic handling systems, a standard actuator plus a separate guiding mechanism takes up more space, adds more mounting work, and may introduce alignment problems. The MHZ2 concept addresses that by combining the gripping mechanism and the guiding structure into a compact body, which helps improve installation efficiency and repeat motion quality. SMC describes the MHZ2 Series as a standard parallel type air gripper and specifies performance characteristics such as tight repeatability and controlled stroke, which support its use in precision-oriented automation.
The 27 g body weight is another important advantage. For small end effectors, indexing stations, electronic assembly fixtures, and compact transfer modules, component mass matters. A lighter gripper reduces the load on brackets, moving slides, and robot wrists, while still giving the designer a real mechanical gripping function rather than a simple push-only cylinder. Because the official manual gives a direct weight figure for the 6 mm MHZ2 version, this is not a guess or distributor estimate; it is a published value from SMC for the relevant size family.
Normally Closed Operation for Secure Part Handling
The single-acting, normally closed characteristic of the MHZ2-6C1 is one of the most meaningful parts of the model code. In SMC’s specification table for the 6 mm version, the “C” action is identified as normally closed. The gripping force value associated with that action is listed as 3.7 N per finger for internal gripping, based on 0.5 MPa supply pressure and a 20 mm gripping point distance. This makes the model suitable for tasks where holding security and controlled clamping are more important than maximum opening force.
From an application standpoint, normally closed grippers are often preferred when a designer wants a defined gripping direction and a more controlled default behavior during cycle transitions. That does not mean the product should be treated as a fail-safe safety device; SMC’s own operating manual explicitly warns that workpieces can still drop if circuit pressure decreases and recommends separate drop-prevention measures where needed. But for general automation, a normally closed gripping pattern is often useful in sorting, transfer, light insertion, and small-part retention systems.
Precision, Repeatability, and Small-Part Control
For small components, precision is usually more important than raw gripping size. The MHZ2-6C1 offers ±0.01 mm repeatability, which is a meaningful figure for compact pneumatic gripping. In applications such as miniature component transfer, plastic part handling, sensor assembly, or small fixture positioning, repeatable finger motion helps reduce mis-picks, inconsistent contact, and poor centering. The specified 4 mm stroke on both sides also indicates that this model is built for short, controlled motion rather than long travel.
The compact bore size and limited stroke should be understood correctly. This is not a large-payload heavy-duty gripper. It is a small precision gripping unit. That distinction matters. If the workpiece is long, off-center, or heavy relative to the finger geometry, a larger gripper or dual-gripper arrangement may be more appropriate. SMC’s manual directly advises users to keep attachments as light and short as possible and to choose a larger model or multiple grippers for long or large workpieces. That guidance is important because small grippers can lose stability quickly if the gripping point is too far from the finger base.
Suitability for Automation Equipment
The SMC MHZ2-6C1 is especially well suited to compact automation cells, light assembly machines, bench-top pneumatic systems, small transfer tooling, and precision gripping stations. Its specification range of 0.3 to 0.7 MPa operating pressure, combined with 180 c.p.m. maximum frequency, makes it a practical option for fast repetitive pneumatic handling where machine space is limited and the payload is modest. Its small size and low mass also make it attractive for designers building dense mechanisms where every millimeter of installation space matters.
Another useful point is that the order chart for the standard no-switch code notes “without auto switch (built-in magnet)”. That means the base part number does not include an auto switch suffix, but the body is still configured around built-in magnetic sensing compatibility. For machine builders, this is helpful because it gives some flexibility if position sensing is added later in the design cycle.
Installation and Selection Considerations
When selecting the MHZ2-6C1, the most important engineering question is not just “Will it fit?” but also “Is the workpiece within the realistic gripping and moment range for this size?” SMC’s manual emphasizes several core selection rules: keep the gripping point within the permitted range, keep fingers and attachments short and light, provide runoff space for thin or needle-shaped workpieces, and avoid excessive external or impact force. Those warnings are not generic filler. They are directly relevant to a 6 mm compact gripper, where even a small increase in finger length or eccentric load can noticeably reduce stability.
Because this is a side tapped mounting version, it is also suitable for installations where tooling attachment and compact integration are priorities. That finger option can simplify custom finger design in small fixtures and packaging equipment, particularly when designers need a clean mounting interface without excessive external brackets. Configurator and distributor references for the exact MHZ2-6C1 code consistently identify it as the side-tapped standard version.
Conclusion
The SMC MHZ2-6C1 is a compact, precise, and practical parallel air gripper for small-part handling in industrial automation. Its core strengths are clear: 6 mm bore, single-acting normally closed operation, 4 mm symmetrical stroke, ±0.01 mm repeatability, 27 g low body weight, and a standard side-tapped finger configuration that supports compact tooling design. For engineers and buyers who need a small pneumatic gripper with stable motion and predictable behavior, the MHZ2-6C1 is a solid choice for light-duty, high-repeatability gripping tasks.
