Airtac SCJ50 Standard Cylinder SCJ50X15-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X15-20S 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, 15mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke15 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X15-20S
The SCJ50X15-20S delivers 982 N of push force at 0.5 MPa in a compact, field-adjustable package. Its 20 mm rear-end adjusting screw lets you fine-tune the stroke end position during commissioning or changeovers without swapping the cylinder, making it ideal for short-stroke clamping or ejector tasks where precise end-stop control is critical.
This model features a built-in magnet for direct mounting of CMSG/DMSG/EMSG sensors, enabling reliable end-of-stroke detection. The 20 mm rod and M16x1.5 thread provide robust guidance, while the PT1/4 port ensures straightforward pneumatic connection. The body length is 194 mm, offering a slightly longer envelope than the fixed-stroke SC equivalent.
Airtac SCJ50 Standard Cylinder SCJ50X15-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X15-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 15 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 SCJ50X15-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×15 | 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 SCJ50X15-20S Is Used
Commissioning Fine-Tuning
Dial in the exact end-stop position during machine setup without needing to swap out hard stops or remachine mounting brackets.
Short-Stroke Clamping
Provides a precise, adjustable 15 mm stroke for consistent clamping force in assembly fixtures, with the screw preventing over-travel.
Wear Take-Up on Stops
Compensate for mechanical wear on external stops over time by simply adjusting the rear screw, maintaining process accuracy.
Is the Airtac SCJ50 Standard Cylinder SCJ50X15-20S the Right Cylinder?
For applications needing more force, stepping up to the SCJ63 provides 1559 N of push at the same pressure. If your task requires a fixed, non-adjustable stroke, the standard SC50 series is a more economical choice. This SCJ50X15-20S is a direct replacement for any AirTAC SCJ50 cylinder with a 15 mm nominal stroke, 20 mm adjust range, PT ports, and a magnet sensor option.
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 SCJ50X15-20S FAQ
At 0.5 MPa, it provides 982 N of push force and 825 N of pull force. The maximum push force at the 1.0 MPa operating limit is 1767 N.
A screw in the rear cap allows you to shorten the stroke end by up to 20 mm. The 15 mm in the model code is the nominal maximum stroke; the screw only limits extension, not retraction.
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Related AirTAC SCJ Adjustable-Stroke Cylinders
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