The SMC CDJ2B16-35Z-Z1Y00397 is a compact round body pneumatic cylinder built for reliable, repeatable linear motion in automation equipment where space is limited and cycle stability matters. At its core, this part belongs to the CJ2/CDJ2 family (miniature round cylinders), using a 16 mm bore and a 35 mm stroke—a very common combination for short-travel pushing, stoppers, small clamping assists, part positioning, and indexing mechanisms.
A useful way to understand SMC’s naming is that CDJ2 typically indicates a CJ2-type cylinder with a built-in magnet to support auto switches (for end-position detection). The CJ2/CDJ2 series is designed to be flexible with switch mounting and mounting options, and it’s widely used because it integrates easily into compact machine frames without requiring bulky brackets or adapters. SMC-focused distributors describing the CJ2-Z family highlight improvements such as fine adjustment of auto switch position and selectable band or rail switch mounting styles.
What the “Z1Y00397” Suffix Usually Means (In Practice)
The suffix Z1Y00397 is not commonly presented as a standard catalog option on most public product pages; instead, it often appears as a traceability / internal identification / special-order tag used in supply chains, listings, or inventory systems (for example, a lot or configuration identifier). When you see a long trailing code like this, the safest assumption for product description is:
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The functional cylinder specification is based on the CDJ2B16-35Z platform (16 mm bore, 35 mm stroke).
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The trailing identifier typically does not change the mechanical envelope in a way that affects basic selection, mounting, or weight, unless you have an SMC order sheet that says otherwise.
That’s why a solid product introduction should focus on the core configuration and clearly state the role of the suffix: identification rather than a new cylinder family.
Core Configuration: What You’re Buying
For the base model family, distributors commonly describe CDJ2/CJ2 round cylinders as:
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Double acting operation (air drives both extend and retract)
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Single rod design
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Rubber bumper cushioning as a common configuration
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Multiple mounting styles (including band mounting)
For a closely related public listing, CDJ2B16-35Z-B is described as a CJ2-Z series air cylinder and emphasizes the ability to select switch mounting type (band or rail) and adjust switch position.
A separate distributor product page for CDJ2B16-35Z-B confirms the 16 mm bore and 35 mm stroke, and explicitly lists “band-mounting style.”
Even if your exact suffix differs, these are the practical behaviors and integration expectations of the platform.
Specification Table (CDJ2B16-35Z Platform)
| Item | Specification / Description |
|---|---|
| Manufacturer | SMC |
| Series / Type | CJ2 / CDJ2 miniature round body cylinder platform |
| Model (requested) | CDJ2B16-35Z-Z1Y00397 |
| Bore size | 16 mm |
| Stroke length | 35 mm |
| Operating style | Double acting (typical for CDJ2/CJ2 round cylinders used in automation) |
| Rod style | Single rod (typical platform configuration) |
| Cushioning | Rubber bumper (common configuration; used in SMC weight table) |
| Mounting style indicator | “B” is commonly listed as band-mounting style on related models |
| Auto switch readiness | CDJ2 family commonly supports auto switches; CJ2-Z descriptions emphasize switch adjustability |
| Net Weight | 73.5 g |
| Gross Weight | 89 g |
Why This Cylinder Is Useful in Real Machines
1) Compact motion without “mechanical sprawl”
Round body cylinders in this size class are often chosen specifically to avoid large rectangular compact-cylinder bodies. If your station is crowded with sensors, guards, or cable routing constraints, a slim round body cylinder can be easier to place and easier to service. That space efficiency can reduce bracket complexity, which reduces long-term maintenance pain.
2) Double-acting control improves cycle stability
Double-acting cylinders give you controlled extend and controlled retract. In automation, that means the return motion is not dependent on a spring or gravity, so timing is more consistent across changes in lubrication, load friction, and speed settings.
3) Auto switch capability supports clean sequencing
In production equipment, simply assuming “it extended” is how you end up with intermittent jams and operator intervention. Cylinders in the CDJ2 ecosystem are widely used with auto switches to confirm end positions. CJ2-Z descriptions emphasize fine adjustment of auto switch position and selectable band/rail mounting styles, which is exactly the kind of detail that helps commissioning and troubleshooting.
4) 16 mm bore and 35 mm stroke is a practical “industrial small actuator”
A 16 mm bore provides meaningful thrust while keeping air consumption moderate. A 35 mm stroke provides enough travel to clear tolerances and part variation in stoppers, gates, and pushers, without turning into a long, flexible assembly.
Typical Applications
| Application | Why CDJ2B16-35Z Fits |
|---|---|
| Conveyor stopper / gate | 35 mm travel is often enough to block and release parts cleanly while staying compact |
| Small part pusher | Stable short stroke for transferring parts into nests or out of chutes |
| Light clamp assist | Helps hold or position parts where full clamp force is not required |
| Test/inspection fixtures | Repeatable extend/retract motion with switch feedback for sequencing |
| Packaging mechanisms | Compact form supports dense layouts and high cycling |
Integration Notes That Improve Reliability
Flow control and mounting stiffness usually matter more than the cylinder brand label.
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Use speed control close to the cylinder. Short strokes can create sharp impacts if airflow is unrestricted. Meter-out control is common to prevent slamming and improve repeatability.
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Avoid side loading. The piston rod is meant to transmit axial force, not act as a guide. If your mechanism has side load, use external guides or a linkage that keeps the rod aligned.
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Treat the suffix as identification unless proven otherwise. For CDJ2B16-35Z-Z1Y00397, the safest documentation practice is to describe the cylinder based on CDJ2B16-35Z core specs, and keep the trailing code as a purchasing/traceability identifier.
Summary
The SMC CDJ2B16-35Z-Z1Y00397 is best described as a CDJ2B16-35Z miniature round body pneumatic cylinder (16 mm bore, 35 mm stroke) with a long suffix that typically functions as an identification or special-order tag rather than a different mechanical platform. Related distributor sources confirm the 16 mm / 35 mm configuration and band-mounting style for the base model family.
