Airtac SCJ50 Standard Cylinder SCJ50X90-50
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X90-50 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, 90mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke90 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X90-50
The SCJ50X90-50 is a double-acting, single-rod pneumatic cylinder with a 50 mm bore, a 90 mm nominal stroke, and a 50 mm rear adjusting screw that lets you fine-tune the stroke end position in the field. It delivers 982 N of push force and 825 N of pull force at 0.5 MPa, using a 20 mm diameter piston rod and PT1/4 ports. The adjustable cushion and tie-rod construction make it a practical workhorse for general automation tasks where the end stop needs to be dialed in precisely without swapping the cylinder.
This model’s 50 mm adjustment range is particularly useful for commissioning trials or format changeovers where the exact stroke length is determined on the machine. The body length A for the SCJ50 series is 194 mm, and the standard operating speed range is 30-800 mm/s. As a genuine AirTAC component, it is built for reliable service with filtered air from 0.15 to 1.0 MPa and an ambient temperature range of -20 to +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X90-50 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X90-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 90 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 SCJ50X90-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×90 | 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 SCJ50X90-50 Is Used
Commissioning & Setup
The 50 mm adjustment screw allows technicians to dial in the exact stroke end position during initial machine setup, eliminating the need for trial-and-error shimming or fixed mechanical stops.
Product Format Changeover
Quickly adapt the cylinder stroke for different product sizes on a packaging or assembly line. The rear screw adjustment is far faster than unbolting and repositioning a fixed-stroke cylinder.
Wear Compensation
In clamping or pressing applications, the adjustable stroke can be extended slightly over time to compensate for tooling wear or material compression, maintaining consistent clamp force without replacing parts.
Is the Airtac SCJ50 Standard Cylinder SCJ50X90-50 the Right Cylinder?
Choose the SCJ50X90-50 when you need a robust mid-bore cylinder with a generous 50 mm of on-machine stroke adjustment. If the 982 N push force at 0.5 MPa is insufficient, stepping up to an SCJ63 bore provides 1559 N of push force at the same pressure. For applications where the stroke is permanently fixed and never needs field adjustment, the standard SC50 series offers a more economical, fixed-stroke alternative. This SCJ model is a direct dimensional replacement for another AirTAC SCJ50 cylinder with the same 90 mm nominal stroke, 50 mm adjust range, PT ports, and basic mounting.
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 SCJ50X90-50 FAQ
The theoretical push force is 982 N at 0.5 MPa and 1767 N at 0.9 MPa. The pull force on the rod-retract stroke is lower due to the 20 mm rod area, providing 825 N at 0.5 MPa. The 50 mm adjustment screw changes only the stroke end position, not the cylinder's force output.
No, like all standard double-acting cylinders, the SCJ50X90-50 will not hold its position if air pressure is exhausted or the directional valve is centered. The adjustable screw sets the stroke end but does not act as a lock. If load holding without live pressure is required, you must add a pilot-operated check valve or an external mechanical rod brake.
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