Airtac SCJ50 Standard Cylinder SCJ50X400-10
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-10 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 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-10 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X400-10
The SCJ50X400-10 is a 50 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke. A rear-cap adjusting screw provides a 10 mm range to fine-tune the stroke end position, making it ideal for commissioning and process tweaks without swapping the cylinder. It delivers a push force of 982 N at 0.5 MPa and 1767 N at 0.9 MPa, using a 20 mm diameter piston rod and PT1/4 ports.
This adjustable-stroke model uses a tie-rod construction and features a variable air cushion for end-of-stroke deceleration. The body length is 194 mm plus the nominal 400 mm stroke, providing a compact yet powerful solution for applications requiring on-machine stroke adjustment. Operating pressure is 0.15-1.0 MPa with a speed range of 30-800 mm/s.
Airtac SCJ50 Standard Cylinder SCJ50X400-10 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 10 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 SCJ50X400-10
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -10 | 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 SCJ50X400-10 Is Used
Commissioning & Setup
The 10 mm rear adjustment screw lets technicians fine-tune the actuator's end position during initial machine setup, eliminating the need to fabricate custom shims or reposition hard stops.
Wear Compensation
On a conveyor diverter or stop gate, the adjustable stroke can be slightly increased over time to compensate for wear on a contact pad or tooling tip, maintaining consistent part engagement.
Small-Batch Format Changes
For a packaging machine handling different box heights, the operator can quickly adjust the stroke end by up to 10 mm to match a new product size without changing the cylinder or programming a new stop position.
Is the Airtac SCJ50 Standard Cylinder SCJ50X400-10 the Right Cylinder?
Choose the SCJ50X400-10 when you need to dial in a precise stroke end position within a 10 mm window during setup or format changes. If your force requirement is lower, the 40 mm bore SCJ40 series provides 628 N of push force at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC50 series is a direct alternative. To replace this cylinder, match a genuine AirTAC SCJ50 with a 400 mm nominal stroke, 10 mm adjust range, PT port thread, and basic mounting.
At a 400 mm stroke, be mindful of side-loading on the rod. If the load is not guided and perfectly axial, the piston rod may be subject to bending moments. In such cases, use an external guide rail or consider a guided cylinder to protect the rod bearings and seals from premature wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-10)
- ✓ 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 SCJ50X400-10 FAQ
The push force is 982 N at 0.5 MPa and 1767 N at 0.9 MPa. The pull force is lower due to the single 20 mm rod, providing 825 N at 0.5 MPa. The 10 mm adjustment range does not change the force output; it only sets the stroke end position.
No. The SCJ is a standard double-acting cylinder and will not hold its position if air pressure is lost or the control valve is centered. The air cushion only decelerates the piston near the stroke end. For mid-stroke holding, you must add an external mechanical brake, rod lock, or pilot-operated check valves.
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