Airtac SCJ50 Standard Cylinder SCJ50X50-40STC
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X50-40STC 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke50 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X50-40STC
The SCJ50X50-40STC puts fine stroke-end tuning directly in your hands with a 40 mm rear-cap adjusting screw, letting you dial in the exact end position on a 50 mm nominal stroke without swapping the cylinder. This double-acting, single-rod tie-rod unit delivers 982 N of push force at 0.5 MPa, driven by a 20 mm diameter piston rod, and is built for rapid commissioning and format changes.
This model comes factory-equipped with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and a centre trunnion (TC) pivot mount, supplied with the TCM1 bracket, making it ideal for swinging or pivoting machine elements. The standard PT1/4 ports and TPU seals suit filtered-air systems from -20 to +70 °C, with a 21 mm air cushion smoothing the end of every stroke.
Airtac SCJ50 Standard Cylinder SCJ50X50-40STC Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X50-40STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 50 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 SCJ50X50-40STC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×50 | 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 SCJ50X50-40STC Is Used
Format Changeovers
Quickly adjust the stroke end stop by up to 40 mm when switching product sizes on packaging or labeling machines, eliminating the need for mechanical stop blocks.
End-Stop Fine-Tuning
Dial in the precise push position for a pressing or clamping operation during initial commissioning, with the centre trunnion allowing the cylinder to self-align.
Pivoting Diverter Gates
Use the TC mount for a swinging diverter arm on a conveyor, where the 40 mm screw adjustment lets you fine-tune the gate's open and closed positions.
Is the Airtac SCJ50 Standard Cylinder SCJ50X50-40STC the Right Cylinder?
Choose the SCJ50X50-40STC when you need to fine-tune a 50 mm stroke end by up to 40 mm on a pivoting assembly. If 982 N of push force at 0.5 MPa is marginal, stepping up to a 63 mm bore provides 1559 N, while a 40 mm bore offers 628 N for lighter, more compact needs. The centre trunnion mount handles angular motion; for a rigid, fixed-axis installation, consider the same cylinder with an LB foot mount or basic body mounting.
For replacement, match an SCJ adjustable-stroke cylinder with a 50 mm bore, 50 mm nominal stroke, and a -40 adjust range. Ensure the port thread is PT, the magnet is present, and the mounting is the TC centre trunnion with TCM1 bracket (F-SC50TC). If your application requires a fixed, non-adjustable stroke, the standard SC series is a more economical choice.
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 SCJ50X50-40STC FAQ
As a single-rod cylinder, push and pull forces differ. At 0.5 MPa, the push force is 982 N and the pull force is 825 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1767 N. The 40 mm stroke-end adjustment does not change the cylinder's force output.
The -40 suffix means a rear adjusting screw can shorten the stroke end by up to 40 mm from the 50 mm nominal maximum. It is a direct dimensional replacement for another SCJ50X50-40 cylinder. It can replace a fixed-stroke SC50X50 only if you need the field-adjustability and the slightly longer body length is acceptable.
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