The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X25-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø50mm bore, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X25-30S is a single-rod, double-acting tie-rod cylinder that puts fine stroke-end tuning directly in your hands via a rear-cap adjusting screw. With a 50 mm bore delivering 982 N of push force at 0.5 MPa (up to 1767 N at 0.9 MPa) and a 20 mm piston rod, it handles moderate clamping and positioning tasks where the final stroke length must be dialed in on the machine.
This model carries the -S suffix, meaning a built-in magnet is fitted along the barrel. That lets you clip on CMSG, DMSG, or EMSG reed or solid-state sensors to detect piston position without external brackets. The 30 mm adjustment range allows you to shorten the 25 mm nominal stroke end by up to 30 mm, making it ideal for commissioning trials or processes that need a variable end stop.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X25-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 30 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×25 | Nominal (maximum) stroke length in mm. |
| -30 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Fine-tune the retract or extend end position during machine bring-up without swapping cylinders or machining hard stops. The 30 mm range gives commissioning engineers a generous window to dial in the exact stroke.
The built-in magnet (-S) and CMSG/DMSG sensors confirm piston arrival at the adjusted stroke end, enabling closed-loop confirmation in pick-and-place or diverting stations where the stop point is changed between product runs.
In clamping fixtures, use the adjusting screw to compensate for pad wear or workpiece thickness variation over time, maintaining consistent clamp force without reprogramming or adding shims.
Choose this SCJ when your application benefits from a field-tweakable stroke end rather than a fixed mechanical stop. If you need more force, step up to the 63 mm bore (1559 N push at 0.5 MPa); if space is tight, the 40 mm bore provides 628 N. For a fixed, non-adjustable stroke, the standard SC series is a simpler, cost-effective alternative. This unit replaces another AirTAC SCJ50X25-30S with PT ports, basic mounting, and a magnet.
At a 25 mm stroke, rod bending from side loads is rarely a concern, but always align the load axially with the rod. If the load path is inherently off-axis, add an external guide rail or consider a guided cylinder to protect the rod bearing and seal.
Adjustable-stroke checklist
A screw in the rear cap limits how far the piston can retract, shortening the stroke end by up to 30 mm. The 25 mm in the model code is the nominal maximum stroke; you set the actual working stroke anywhere within that 30 mm adjustment band by turning the screw.
At 0.5 MPa, it delivers 982 N pushing and 825 N pulling. The push force is higher because the single 20 mm rod reduces the effective piston area on the pull side. Maximum push force at the 0.9 MPa operating limit is 1767 N.
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