Airtac SCJ50 Standard Cylinder SCJ50X250-100
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø50mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke250 mm
- Stroke adjust-100 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X250-100
The AirTAC SCJ50X250-100 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, giving you a 100 mm tuning range on the machine without swapping the unit. Its 50 mm bore delivers 982 N of push force at 0.5 MPa, rising to 1767 N at the maximum operating pressure of 0.9 MPa, making it a solid mid-range actuator for clamping, pressing, and positioning tasks.
A rear-cap adjusting screw shortens the nominal 250 mm stroke by up to 100 mm, letting commissioning engineers dial in the exact stop point for format changes or wear take-up. The cylinder uses a 20 mm diameter piston rod, PT1/4 ports, and a 21 mm air cushion for smooth deceleration. The tie-rod body length (A dimension) is 194 mm plus stroke, and the unit is compatible with the SCJ mounting subset: basic, FA, LB, and TC centre trunnion.
Airtac SCJ50 Standard Cylinder SCJ50X250-100 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 100 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 SCJ50X250-100
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -100 | 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 SCJ50X250-100 Is Used
Commissioning & Process Tuning
The 100 mm rear adjustment lets technicians fine-tune the end-of-stroke position during machine setup without fabricating custom stops, dramatically cutting commissioning time on assembly fixtures.
Product Format Changeover
On packaging or sorting lines, operators can quickly adjust the cylinder's stroke to handle different product sizes or box dimensions, eliminating mechanical change parts and reducing downtime between batches.
Wear Compensation in Clamping
In high-cycle clamping operations, the adjustable stroke compensates for jaw or pad wear over time. A simple turn of the rear screw restores the correct clamping position, maintaining consistent part quality without disassembly.
Is the Airtac SCJ50 Standard Cylinder SCJ50X250-100 the Right Cylinder?
This 50 mm bore model suits applications needing a push force around 982 N at standard plant pressure. If your load requires more force, stepping up to the 63 mm bore (1559 N push at 0.5 MPa) is the logical move; for a lighter, more compact solution, the 40 mm bore provides 628 N. The 100 mm adjustment range is the largest standard option for this series, offering maximum on-machine flexibility.
When ordering a direct replacement, match the bore (50 mm), nominal stroke (250 mm), and the full -100 adjustable range code. Ensure the port thread is PT, and if your current unit uses a mounting bracket, specify the correct SCJ accessory (e.g., FA front flange or LB foot). For this 250 mm stroke, rod buckling is not a primary concern at typical pressures, but if the application involves significant side loads, consider adding an external guide rail or switching to a guided cylinder to protect the rod and bearing.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-100)
- ✓ 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 SCJ50X250-100 FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N (pull force is lower due to the 20 mm rod area). At the maximum operating pressure of 0.9 MPa, the push force reaches 1767 N. The adjustable stroke screw does not alter the cylinder's force output.
A rear-cap screw mechanically limits the piston's retraction stroke end, giving you an adjustable range of 100 mm from the nominal 250 mm stroke. Choose the SCJ when you need to fine-tune the stop position on the machine for different setups or to compensate for wear. If your application has a single, fixed stroke that never changes, the standard SC series is a more economical choice.
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