Airtac SCJ40 Standard Cylinder SCJ40X50-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø40mm bore, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke50 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X50-20S
The SCJ40X50-20S is a 40 mm bore, double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly in your hands. A rear-cap adjusting screw provides up to 20 mm of field-adjustable stroke reduction, so you can dial in the exact end position without swapping the cylinder or adding external hard stops. With a 16 mm diameter piston rod and PT1/4 ports, it delivers 628 N of push force at 0.5 MPa, making it a capable actuator for medium-duty positioning tasks.
This model includes a built-in magnet, allowing easy attachment of CMSG/DMSG/EMSG reed or solid-state sensors directly onto the tie-rod barrel for precise end-of-stroke or mid-stroke position feedback. The standard TPU seal operates reliably from -20 to +70 °C, and the body length A(SCJ) is 185 mm, providing a compact footprint for integration into machinery where space and adjustability are both critical.
Airtac SCJ40 Standard Cylinder SCJ40X50-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SCJ40 Standard Cylinder SCJ40X50-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -20 | 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 SCJ40 Standard Cylinder SCJ40X50-20S Is Used
Commissioning & Setup
Fine-tune the end-of-stroke position during machine installation to perfectly align with mating tooling or fixtures, eliminating the need for shims or custom spacers.
Wear Compensation
Adjust the stroke end to take up mechanical play or seal wear over time in clamping or pressing operations, maintaining consistent contact force without reprogramming.
Format Changeover
Quickly adapt the cylinder's stop position for different product sizes on a packaging or sorting line, reducing downtime between batches with a simple screw adjustment.
Is the Airtac SCJ40 Standard Cylinder SCJ40X50-20S the Right Cylinder?
Choose the SCJ40X50-20S when your application needs a 50 mm nominal stroke with the ability to trim the end position by up to 20 mm during commissioning or changeovers. If you require more force, stepping up to a 50 mm bore provides 982 N of push at the same 0.5 MPa pressure. For applications where the stroke never needs field adjustment, a fixed-stroke SC40X50 cylinder offers a simpler, slightly shorter alternative. This adjustable-stroke unit is a direct replacement for another AirTAC SCJ40 cylinder with the same 50 mm nominal stroke, 20 mm adjust range, PT ports, and magnet, ensuring consistent fit and function.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ40 Standard Cylinder SCJ40X50-20S FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. The theoretical force at 1.0 MPa is 128 kgf.
A rear-cap screw mechanically limits how far the piston can extend, shortening the stroke end by up to 20 mm. It is not a speed or force control. The cylinder's speed is managed by external flow controls in your pneumatic circuit.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SCJ Adjustable-Stroke Cylinders
Request a Quote for Airtac SCJ40 Standard Cylinder SCJ40X50-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.