Airtac SCJ50 Standard Cylinder SCJ50X200-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X200-20S 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, 200mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke200 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X200-20S
The SCJ50X200-20S is a double-acting, single-rod pneumatic cylinder that adds a rear-cap adjusting screw for on-machine stroke-end tuning. Its 20 mm adjustment range lets you dial in the final position without swapping the cylinder or adding external hard stops—ideal for commissioning trials and format changeovers. The built-in magnet (suffix -S) allows CMSG/DMSG/EMSG reed or solid-state sensors to clamp directly onto the tie-rod barrel for clean end-of-stroke sensing.
At 0.5 MPa air pressure this 50 mm bore unit delivers 982 N pushing force and 825 N on the return stroke, with a 20 mm rod and PT1/4 ports. The adjustable air cushion decelerates the piston over the last 21 mm of travel, and the body length A(SCJ) is 194 mm plus stroke. With a 200 mm nominal stroke it stays within the 1200 mm maximum for bore 50, so it is a standard-configuration cylinder.
Airtac SCJ50 Standard Cylinder SCJ50X200-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X200-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 200 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 SCJ50X200-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×200 | 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 SCJ50X200-20S Is Used
Commissioning & Setup
The 20 mm rear screw lets technicians fine-tune the end position during initial machine bring-up without repeatedly swapping shims or hard stops.
Format Changeovers
On packaging lines that run multiple box sizes, the adjustable stroke is reset in seconds to match a new product length, cutting downtime between batches.
Wear Compensation
As gripper pads or tooling tips wear down over thousands of cycles, the stroke-end screw can be advanced slightly to restore the exact contact point.
Is the Airtac SCJ50 Standard Cylinder SCJ50X200-20S the Right Cylinder?
Choose this 50 mm bore when the 40 mm SCJ (628 N push at 0.5 MPa) is too light but the 63 mm (1559 N push) would oversize the machine. The SCJ is the right family whenever you need to fine-tune the stroke end during setup or after wear; if the stroke length is fixed and never needs field adjustment, the simpler SC fixed-stroke cylinder saves cost and length. For a direct replacement, match the 50 mm bore, 200 mm nominal stroke, 20 mm adjust range, PT port thread, basic mount, and the -S magnet option—only another SCJ50X200-20S will drop in without re-plumbing or re-timing sensors. At 200 mm stroke, side-load forces are moderate, but if the rod sees off-axis loads, add an external guide rail or switch to a guided cylinder to protect the rod bearing and seal.
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 SCJ50X200-20S FAQ
At the standard 0.5 MPa operating pressure the cylinder produces 982 N on the push stroke and 825 N on the pull stroke. At the maximum operating pressure of 1.0 MPa, push force reaches 1963 N. The push force is higher than the pull force because the single rod reduces the piston area on the return side.
Yes, the SCJ50X200-20S is mechanically identical to the non-magnet SCJ50X200-20 in bore, stroke, adjust range, port size, and mounting dimensions. The only difference is the built-in magnet, which adds sensor compatibility without changing the cylinder envelope—you can swap it in and optionally add CMSG/DMSG sensors later.
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