Airtac SCJ50 Standard Cylinder SCJ50X120-40S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X120-40S 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, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke120 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X120-40S
The SCJ50X120-40 is a double-acting, single-rod pneumatic cylinder that puts stroke-end tuning directly on the machine. With a 50 mm bore and a 20 mm rod, it delivers 982 N of push force at 0.5 MPa (1767 N at 0.9 MPa), while the rear adjusting screw lets you shorten the effective stroke by up to 40 mm from the 120 mm nominal maximum.
A built-in magnet (-S suffix) allows CMSG/DMSG/EMSG sensors to clamp directly onto the tie-rod barrel for non-contact position sensing. The cylinder uses PT1/4 ports, M16x1.5 rod threads, and a 21 mm air cushion to decelerate the piston quietly at end of travel. Body length A(SCJ) is 194 mm, making it a compact choice when field adjustability is needed.
Airtac SCJ50 Standard Cylinder SCJ50X120-40S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X120-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 120 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 SCJ50X120-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×120 | 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 SCJ50X120-40S Is Used
Commissioning & Setup
Fine-tune the end position of a clamp or stop on a new assembly fixture without machining shims or moving hard stops, saving hours of mechanical adjustment.
Product Changeover
Adjust the stroke end to accommodate different box or pallet sizes on a packaging line. The 40 mm range covers multiple SKU formats with a single cylinder part number.
Wear Compensation
Take up mechanical play or seal compression over time in a pressing or crimping station. The rear screw lets operators restore the exact stroke end without disassembling the tooling.
Is the Airtac SCJ50 Standard Cylinder SCJ50X120-40S the Right Cylinder?
Choose the SCJ50X120-40 when you need to dial in a stroke end position during commissioning or after tooling wear, without swapping the cylinder. If 982 N push is marginal, stepping up to a 63 mm bore (SCJ63, 1559 N push at 0.5 MPa) adds force while keeping the same M16x1.5 rod thread. For applications that do not require stroke adjustability, the fixed-stroke SC50 offers a simpler, lower-cost alternative.
This model is a direct replacement for another AirTAC SCJ50 with a 120 mm nominal stroke, 40 mm adjust range, PT ports, basic mounting, and the -S magnet. If side loads are present, add an external guide rail or consider a guided cylinder, as the rod bearing is not designed to carry transverse forces.
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 SCJ50X120-40S FAQ
Push force is 982 N at 0.5 MPa, 1374 N at 0.7 MPa, and 1767 N at the maximum operating pressure of 0.9 MPa. Pull force is lower because of the 20 mm rod: 825 N at 0.5 MPa. The adjusting screw does not change the force output.
Yes, if the original cylinder has a 50 mm bore, 120 mm nominal stroke, 40 mm adjust range, PT ports, basic mounting, and a magnet. Match the -{adj} value and all suffix codes exactly to ensure the same stroke adjustability and sensor compatibility.
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