Airtac SCJ50 Standard Cylinder SCJ50X40-40
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X40-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø50mm bore, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke40 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X40-40
The SCJ50X40-40 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering a 40mm adjustment range on a 40mm nominal stroke. In the 50mm bore class, it delivers 982 N of push force and 825 N of pull force at 0.5 MPa, making it a versatile actuator for applications needing precise end-position tuning without replacing the cylinder.
This tie-rod cylinder uses a rear-cap adjusting screw to shorten the stroke end, allowing for quick commissioning changes or wear take-up. It features a 20mm piston rod, PT1/4 ports, an M16x1.5 rod thread, and a 21mm air cushion for smooth deceleration. The body length A(SCJ) is 194mm, and it operates reliably on 40µm filtered air from 0.15 to 1.0 MPa.
Airtac SCJ50 Standard Cylinder SCJ50X40-40 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X40-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 40 mm |
| Stroke adjustment | Up to 40 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 SCJ50X40-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×40 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ50X40-40 Is Used
Commissioning & Setup
Ideal for machine builders who need to dial in the exact end-of-stroke position during initial setup, the 40mm adjustment screw allows for quick, tool-free fine-tuning without swapping out hard stops.
Wear Compensation
In clamping or pressing operations, the adjustable stroke can be periodically shortened to compensate for wear on tooling or workpieces, maintaining consistent clamp force without reprogramming a controller.
Product Changeover
Use the SCJ50X40-40 on a diverter gate or stop where different product sizes require a slightly different cylinder extension. The 40mm adjust range handles multiple formats with a single, simple mechanical adjustment.
Is the Airtac SCJ50 Standard Cylinder SCJ50X40-40 the Right Cylinder?
Choose the SCJ50X40-40 when you need to fine-tune the stroke end position within a 40mm window on a 50mm bore platform. If 982 N of push force at 0.5 MPa is insufficient, stepping up to a 63mm bore provides 1559 N of push force. Should your application require a fixed, non-adjustable stroke, the standard SC series cylinder is a more economical choice. For a direct replacement, match the 50mm bore, 40mm nominal stroke, 40mm adjust range, PT port thread, and basic mounting style.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ50X40-40 FAQ
The output force depends on your air pressure. At a standard 0.5 MPa, the cylinder produces 982 N of push force and 825 N of pull force (due to the 20mm rod). At the maximum operating pressure of 1.0 MPa, the theoretical push force is 1964 N.
A rear-cap adjusting screw limits the retract stroke end. The '-40' in the model code means you can shorten the nominal 40mm stroke by up to 40mm, effectively giving you a field-adjustable stroke range from 0 to 40mm. It does not adjust the extend speed or force.
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