Airtac SCJ50 Standard Cylinder SCJ50X55-50S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X55-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø50mm bore, 55mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke55 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X55-50S
The AirTAC SCJ50X55-50S is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a nominal 55 mm stroke, featuring a rear-cap adjusting screw that provides up to 50 mm of stroke-end reduction. This allows the effective stroke to be fine-tuned anywhere between 5 mm and 55 mm directly on the machine, eliminating the need for external hard stops. The built-in magnet enables direct mounting of CMSG/DMSG/EMSG sensors for reliable, non-contact position sensing.
With a 20 mm diameter rod and PT1/4 ports, the SCJ50X55-50S delivers a push force of 982 N at 0.5 MPa and 1767 N at 0.9 MPa. Its pull force is 825 N at 0.5 MPa due to the rod area. The cylinder includes an adjustable air cushion (21 mm length) for smooth deceleration and has a body length A of 194 mm, making it a compact solution for applications requiring on-the-fly stroke adjustment.
Airtac SCJ50 Standard Cylinder SCJ50X55-50S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X55-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 55 mm |
| Stroke adjustment | Up to 50 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 SCJ50X55-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×55 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ50X55-50S Is Used
Commissioning & Setup
The 50 mm adjustment range lets technicians dial in the exact stroke end during machine commissioning without swapping cylinders or machining custom stops, drastically reducing setup time.
Format Changeovers
On packaging or assembly lines, the adjustable stroke allows operators to quickly adapt the cylinder's end position for different product sizes or tooling, minimizing downtime between production runs.
Wear Compensation
In clamping or pressing operations, the stroke can be incrementally extended over time to compensate for wear on gripper pads or tooling, maintaining consistent clamping force without replacing parts.
Is the Airtac SCJ50 Standard Cylinder SCJ50X55-50S the Right Cylinder?
Choose the SCJ50X55-50S when you need a field-adjustable stroke end within a 50 mm range and the 982 N push force at 0.5 MPa meets your load requirements. If you need more force, step up to the 63 mm bore SCJ63 series, which provides 1559 N of push force at the same pressure. For applications that do not require stroke adjustability, the fixed-stroke SC50 series offers a simpler, more cost-effective alternative.
This model is a direct replacement for any AirTAC SCJ50 cylinder with a 55 mm nominal stroke, a 50 mm adjustment range, PT ports, a basic mount, and a magnet. For strokes of 300 mm or more, evaluate the side-loading on the 20 mm rod; an external guide rail or a switch to a guided cylinder may be necessary to prevent rod bending and ensure long seal life.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ50X55-50S FAQ
The push force is 982 N at 0.5 MPa and 1767 N at 0.9 MPa. The pull force is lower, at 825 N at 0.5 MPa, because the 20 mm piston rod reduces the effective area on the return stroke.
A rear adjusting screw lets you shorten the stroke end by up to 50 mm. Choose this SCJ model when your application requires fine-tuning the end position during setup, for different product formats, or to take up wear. If your stroke length is fixed and never needs adjustment, the standard SC series is a more economical choice.
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