Airtac SCJ50 Standard Cylinder SCJ50X400-100S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-100S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 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-100 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X400-100S
The SCJ50X400-100 is a 50 mm bore double-acting single-rod cylinder with a field-adjustable stroke end, offering a nominal 400 mm maximum stroke and a 100 mm rear-screw adjustment range. At 0.5 MPa it delivers 982 N push and 825 N pull, using a 20 mm diameter piston rod and PT1/4 ports, making it a solid mid-range actuator for tasks that need regular end-position tweaking.
Because the adjusting screw is in the rear cap, operators can dial in the exact stroke end without removing the cylinder or adding external hard stops—ideal for commissioning trials, format changeovers, and taking up wear on tooling. The built-in magnet (suffix -S) lets CMSG/DMSG/EMSG sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing, and the 21 mm air cushion at each end decelerates the piston quietly.
Airtac SCJ50 Standard Cylinder SCJ50X400-100S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 100 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 SCJ50X400-100S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -100 | 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 SCJ50X400-100S Is Used
Commissioning & Setup
Fine-tune the end position during machine bring-up without swapping cylinders. The 100 mm screw range lets technicians dial in the exact stroke after mounting.
Wear Compensation
On clamping or pressing fixtures, the adjustable stroke takes up pad wear over time, maintaining consistent contact force without reprogramming the machine.
Format Changeover
Adjust the push stroke for different product sizes on a packaging line. Operators can reset the stop in seconds, cutting downtime between batches.
Is the Airtac SCJ50 Standard Cylinder SCJ50X400-100S the Right Cylinder?
Step up to a 63 mm bore SCJ (1559 N push at 0.5 MPa) if your load demands more force, or down to a 40 mm bore (628 N) to save air and space on lighter tasks. If you never need to alter the stroke after installation, the fixed-stroke SC50X400 is a simpler, lower-cost alternative. For a drop-in replacement, match the 50 mm bore, 400 mm nominal stroke, 100 mm adjust range, PT thread, and the -S magnet; the mounting style is basic, so add an FA front flange or LB foot bracket from the F-SC50 accessory range if needed. At 400 mm stroke, watch for side loading—consider an external guide rail or switch to a guided cylinder if the rod sees off-axis forces.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-100)
- ✓ 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 SCJ50X400-100S FAQ
At 0.5 MPa, push force is 982 N and pull force is 825 N. At the maximum operating pressure of 0.9 MPa, push reaches 1767 N. The pull force is lower because the 20 mm rod reduces the effective piston area on the return stroke.
Yes, if the original is an AirTAC SCJ with a 50 mm bore, 400 mm nominal stroke, 100 mm adjust range, PT ports, and a built-in magnet. Verify your mounting style—this basic version needs an accessory bracket (FA, LB, or TC) if your existing cylinder has one.
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