Airtac SCJ50 Standard Cylinder SCJ50X135-30S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X135-30S 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, 135mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke135 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X135-30S
The SCJ50X135-30S is a double-acting, single-rod pneumatic cylinder that puts fine stroke control directly on the machine. Its rear-cap adjusting screw lets you shorten the stroke end by up to 30 mm in the field, which is ideal for dialling in precise stop positions during commissioning or format changes without swapping the cylinder. With a 50 mm bore and 20 mm rod, it delivers 982 N of push force at 0.5 MPa, placing it in a versatile mid-range force class.
This model includes a built-in magnet (-S suffix), so reed or solid-state sensors like CMSG/DMSG/EMSG clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing. The body length A(SCJ) is 194 mm, and the adjustable air cushion decelerates the piston smoothly at both ends. The 135 mm nominal stroke is well within the 1200 mm maximum for this bore, making it a standard, readily available configuration.
Airtac SCJ50 Standard Cylinder SCJ50X135-30S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X135-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 135 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.
Theoretical Output Force (Ø50mm)
| 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.
Model Code: Airtac SCJ50 Standard Cylinder SCJ50X135-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×135 | 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.
Where the Airtac SCJ50 Standard Cylinder SCJ50X135-30S Is Used
Commissioning & Setup
Fine-tune the actuator's end-stop by up to 30 mm on a new assembly line without removing the cylinder, slashing setup time and eliminating the need for custom spacer blocks.
Wear Compensation
On a high-cycle clamping or pressing fixture, periodically adjust the stroke end to compensate for tooling wear or material compression, maintaining consistent clamping force without reprogramming.
Format Changeovers
Quickly adapt a packaging machine's pusher stroke for different product sizes. The 30 mm adjustment range allows a single cylinder model to handle multiple SKUs, reducing changeover parts inventory.
Is the Airtac SCJ50 Standard Cylinder SCJ50X135-30S the Right Cylinder?
Choose the SCJ50 when you need the 982 N push force at 0.5 MPa that a 50 mm bore provides. If your application requires more force, stepping up to a 63 mm bore (SCJ63) gives you 1559 N of push at the same pressure; if space is tight and you can accept less force, the 40 mm bore (SCJ40) delivers 628 N. The 30 mm adjustable range on this model is perfect for applications needing moderate end-position flexibility. For a direct replacement, match the 50 mm bore, 135 mm nominal stroke, 30 mm adjust range, PT port thread, basic mounting, and the integrated magnet (-S). If your stroke never needs adjustment, a fixed-stroke SC50X135-S cylinder is a simpler, more cost-effective alternative.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ50 Standard Cylinder SCJ50X135-30S FAQ
At the standard 0.5 MPa operating pressure, this 50 mm bore cylinder provides 982 N of push force and 825 N of pull force. The pull force is lower because the 20 mm piston rod reduces the effective area on the return stroke. At the maximum operating pressure of 1.0 MPa, the push force reaches 1963 N.
Yes, provided the mounting and porting match. The SCJ50X135-30S is a direct dimensional replacement for another AirTAC SCJ50 with the same bore, nominal stroke, and adjust range. It is not a drop-in for a fixed-stroke SC cylinder because the SCJ body is longer to house the adjusting mechanism. Always verify the body length A(SCJ) of 194 mm fits your machine envelope.
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