Airtac SCJ50 Standard Cylinder SCJ50X400-40
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-40 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke400 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X400-40
The SCJ50X400-40 is a double-acting, single-rod pneumatic cylinder that integrates a rear-cap adjusting screw, giving you 40 mm of field-adjustable stroke-end control on a 400 mm nominal body. At 0.5 MPa it delivers 982 N push and 825 N pull, driven by a 20 mm piston rod, making it a solid mid-range actuator for applications that need repeatable end-stop tuning.
This 50 mm bore tie-rod cylinder uses PT1/4 ports and includes a 21 mm air cushion at each end to decelerate the piston quietly. The body length A(SCJ) is 194 mm plus stroke, so the assembly remains compact even with the adjustment mechanism. The screw only sets the stroke end position within the 40 mm range; it does not alter force, speed, or the cylinder's 0.15–1.0 MPa operating window.
Airtac SCJ50 Standard Cylinder SCJ50X400-40 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 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 SCJ50X400-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×400 | 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 SCJ50X400-40 Is Used
Commissioning & Setup Trials
The 40 mm adjustment range lets technicians dial in the exact stroke end on a new assembly station without swapping cylinders or machining custom stops, cutting commissioning time.
Wear Compensation on Pushers
On a packaging line pusher that gradually wears its contact pad, the rear screw can be tweaked to restore the precise push distance, keeping product placement accurate between maintenance intervals.
Format Changeover in Clamping
When a woodworking clamp must handle two material thicknesses, the operator adjusts the stroke end by up to 40 mm to set the clamp gap, avoiding a full cylinder swap for each batch.
Is the Airtac SCJ50 Standard Cylinder SCJ50X400-40 the Right Cylinder?
Step up to a 63 mm bore if your load consistently exceeds 1374 N push at 0.5 MPa; step down to 40 mm (628 N push) for lighter, faster-cycling fixtures. The SCJ is the right pick when you need to dial in a stroke end on the machine—during commissioning, format changeovers, or to take up tooling wear—without adding external hard stops. If your stroke is fixed and never needs field adjustment, the standard SC50X400 saves cost and a small amount of length.
For a direct replacement, match an SCJ50 with a 400 mm nominal stroke, -40 adjust range, PT thread, and the same mounting accessory. At 400 mm, side-load and rod buckling become real concerns: keep the load axially aligned, use an external guide rail, or consider a guided cylinder if off-axis forces are unavoidable. The SCJ mounting subset includes FA front flange (F-SC50FA), LB foot (F-SC50LB), and TC centre trunnion with TCM1 bracket (F-SC50TC).
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 SCJ50X400-40 FAQ
A screw in the rear cap limits how far the piston retracts, shortening the stroke end by up to 40 mm. The 400 mm in the code is the maximum nominal stroke; you can reduce it anywhere within that 40 mm window. The screw adjusts position only—it does not change the cylinder's force, speed, or cushioning.
At the standard 0.5 MPa operating pressure, the SCJ50X400-40 produces 982 N pushing and 825 N pulling. At the maximum 1.0 MPa, push force reaches 1963 N. Because it is a single-rod cylinder, push force is always greater than pull force due to the rod area on the return side.
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