Airtac SCJ50 Standard Cylinder SCJ50X40-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X40-20S 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. Ø50mm bore, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke40 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X40-20S
The SCJ50X40-20S is a double-acting, single-rod tie-rod cylinder that lets you fine-tune the stroke end position by up to 20 mm via a rear-cap adjusting screw, without swapping the unit. With a 50 mm bore and 20 mm rod, it delivers 982 N of push force at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa, making it a strong choice for mid-range pneumatic tasks that need on-machine adjustability.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG sensors clamp directly onto the barrel for reliable end-of-stroke detection. The body length A(SCJ) is 194 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjustment mechanism, and the PT1/4 port keeps plumbing straightforward.
Airtac SCJ50 Standard Cylinder SCJ50X40-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X40-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 40 mm |
| Stroke adjustment | Up to 20 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 SCJ50X40-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×40 | 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 SCJ50 Standard Cylinder SCJ50X40-20S Is Used
Commissioning & Setup
Dial in the exact stroke end during machine commissioning with the 20 mm rear screw adjustment, eliminating the need for external hard stops or shims.
Format Changeovers
Quickly adapt the cylinder stroke for different product sizes on packaging or assembly lines, reducing downtime between batches.
Wear Compensation
Take up mechanical play or seal wear over time by slightly extending the effective stroke, maintaining consistent clamping or pressing force.
Is the Airtac SCJ50 Standard Cylinder SCJ50X40-20S the Right Cylinder?
Choose the SCJ50 when your application needs around 982 N of push force at standard shop air. If you require more force, the SCJ63 delivers 1559 N push at 0.5 MPa; for a lighter, more compact solution, the SCJ40 provides 628 N. The 20 mm adjustable range is ideal for commissioning trials or format changeovers where the stroke end must be dialled in precisely. If your stroke is fixed and you never need to adjust it, a standard SC50 cylinder is a simpler, cost-effective alternative. For a direct replacement, match the 50 mm bore, 40 mm nominal stroke, 20 mm adjust range, PT port thread, and the built-in magnet; the basic mounting style accepts the same foot (LB) or flange (FA) accessories from the SCJ subset.
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 SCJ50 Standard Cylinder SCJ50X40-20S FAQ
At 0.5 MPa, the cylinder produces 982 N pushing and 825 N pulling. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The pull force is lower because the 20 mm rod reduces the effective piston area on the return stroke.
You can, provided the 40 mm nominal stroke and 20 mm adjust range suit your application. The SCJ body is slightly longer (194 mm) to house the adjusting screw. Ensure your mounting and porting (PT1/4) match, and note that the built-in magnet on this -S variant requires sensor-compatible mounting space.
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