Airtac SCJ40 Standard Cylinder SCJ40X50-20TC
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-20TC 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 SCJ40X50-20TC
The SCJ40X50-20TC is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a 50 mm nominal stroke, featuring a rear-cap adjusting screw that provides up to 20 mm of stroke-end reduction. This allows you to fine-tune the piston stop position on the fly without replacing the cylinder, making it ideal for commissioning trials and format changeovers. The TC suffix indicates a centre trunnion mount, supplied with the TCM1 bracket, enabling the cylinder to pivot smoothly in swinging applications.
At 0.5 MPa, this cylinder delivers 628 N of push force and 528 N of pull force, with a maximum push of 1130 N at 0.9 MPa. The 16 mm diameter piston rod provides robust guidance, while the PT1/4 port ensures straightforward pneumatic connection. Its tie-rod construction and 21 mm adjustable air cushion at each end contribute to reliable, long-lasting operation in industrial environments.
Airtac SCJ40 Standard Cylinder SCJ40X50-20TC Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-20TC |
|---|---|
| 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 SCJ40X50-20TC
| 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 SCJ40X50-20TC Is Used
Format Changeovers
Quickly adjust the stroke end to accommodate different product sizes on a packaging line without swapping out the cylinder or mechanical stops, minimizing downtime.
Pivoting Diverter Gates
The centre trunnion mount allows the cylinder to swing, and the 20 mm adjustment range lets you fine-tune the gate's open and closed positions for reliable material sorting.
Commissioning & Wear Take-Up
During machine setup, the stroke can be dialed in precisely. Over time, the screw can be adjusted to compensate for mechanical wear in linkages, maintaining cycle accuracy.
Is the Airtac SCJ40 Standard Cylinder SCJ40X50-20TC the Right Cylinder?
Choose the SCJ40X50-20TC when you need a mid-range force cylinder that can be pivoted and requires precise, field-adjustable stroke end positioning. If your application demands more force, stepping up to a 50 mm bore provides 982 N of push force at 0.5 MPa. For a purely linear, non-pivoting setup, the same cylinder with an LB foot mount or basic mount might be a simpler choice. If stroke adjustment is not needed, a fixed-stroke SC40X50 cylinder is a direct alternative.
This model is a direct replacement for any AirTAC SCJ40X50-20TC cylinder with a centre trunnion mount and PT ports. The F-SC40TC mounting kit is included. For applications requiring piston position sensing, consider the SCJ40X50-20TCS variant, which includes a built-in magnet for use with CMSG/DMSG sensors.
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 SCJ40X50-20TC FAQ
At the standard 0.5 MPa operating pressure, the push force is 628 N and the pull force is 528 N. The maximum push force at 0.9 MPa is 1130 N. The pull force is lower because the rod takes up area on the piston.
Yes, the SCJ40X50-20TC is dimensionally compatible with the SC series for the same bore and stroke, but it adds a rear adjusting screw. Ensure the additional length of the adjusting mechanism fits your machine. The mounting accessories, like the TC trunnion, are also interchangeable.
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