Airtac SCJ50 Standard Cylinder SCJ50X55-30S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X55-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø50mm bore, 55mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke55 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X55-30S
The SCJ50X55-30S is a double-acting, single-rod pneumatic cylinder that puts stroke-end adjustment directly into the rear cap. A 30 mm adjusting screw lets you shorten the nominal 55 mm stroke in fine increments, so machine commissioning and format changeovers happen with a simple turn instead of a cylinder swap. At 0.5 MPa it delivers 982 N push and 825 N pull, and the 20 mm rod diameter gives solid rigidity for medium-duty positioning tasks.
This model includes a built-in magnet, so CMSG/DMSG/EMSG sensors clamp straight onto the tie-rod barrel for reliable end-of-stroke detection. The port is PT1/4, the rod thread is M16x1.5, and the adjustable air cushion provides a 21 mm deceleration zone. The body length A(SCJ) is 194 mm, making it a compact drop-in where stroke flexibility matters more than fixed dimensions.
Airtac SCJ50 Standard Cylinder SCJ50X55-30S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X55-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 55 mm |
| Stroke adjustment | Up to 30 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 SCJ50X55-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×55 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ50X55-30S Is Used
Commissioning Fine-Tuning
Dial in the exact 55 mm or shorter stroke during machine setup without removing the cylinder. The 30 mm adjust range lets technicians quickly compensate for assembly tolerances.
Wear Take-Up in Clamping
In repetitive clamping fixtures, the adjustable stroke end compensates for pad wear over time. A quick turn of the rear screw restores full clamping force without replacing the cylinder.
Format Changeovers
On packaging lines that run different product sizes, the SCJ50X55-30S allows operators to reset the pusher stroke in seconds. The built-in magnet ensures the new end position is always confirmed by a sensor.
Is the Airtac SCJ50 Standard Cylinder SCJ50X55-30S the Right Cylinder?
Step up to the SCJ63 bore for 1559 N push at 0.5 MPa when the 982 N of the 50 bore is borderline, or drop to the SCJ40 with 628 N push if space and weight are the primary constraints. If your application never needs stroke adjustment, the fixed-stroke SC50 cylinder is a simpler, slightly shorter alternative. For a direct replacement, match the 50 mm bore, 55 mm nominal stroke, 30 mm adjust range, PT1/4 port, basic mounting, and the -S magnet option. At this 55 mm stroke, rod bending from side loads is minimal, but any off-axis force should still be managed with an external guide.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ50X55-30S FAQ
At the standard 0.5 MPa operating pressure, the push force is 982 N and the pull force is 825 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1964 N. The adjustable stroke screw does not alter these force values.
Yes, if you need field-adjustable stroke. The SCJ body is slightly longer to house the adjusting screw, but the bore, port (PT1/4), rod thread (M16x1.5), and mounting footprint are identical to the SC50. Ensure the 30 mm adjustment range covers your stroke variation needs.
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