Airtac SCJ50 Standard Cylinder SCJ50X55-20
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X55-20 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, 55mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke55 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X55-20
The AirTAC SCJ50X55-20 is a double-acting, single-rod pneumatic cylinder featuring a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke reduction. This allows engineers to fine-tune the piston's end position for commissioning, format changes, or wear take-up without replacing the cylinder. The 50 mm bore delivers a push force of 982 N at 0.5 MPa, making it a capable mid-range actuator.
This model has a nominal 55 mm stroke, a 20 mm piston rod with M16x1.5 threads, and PT1/4 ports. The adjustable air cushion decelerates the piston smoothly, with a cushion length of 21 mm. Its tie-rod construction results in a body length of 194 mm, slightly longer than a fixed-stroke SC to accommodate the adjusting mechanism. The standard TPU seals operate reliably from -20 to +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X55-20 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X55-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 55 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 SCJ50X55-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×55 | 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 SCJ50X55-20 Is Used
Commissioning Fine-Tuning
Use the 20 mm adjust screw to precisely set the end stop during machine setup, eliminating the need to shim or reposition the cylinder body.
Product Format Changeover
Quickly adapt a pusher or stop gate for different product sizes on a packaging line by adjusting the stroke end without tools.
Wear Compensation
Adjust the stroke end to compensate for wear on gripper pads or tooling tips, maintaining consistent contact pressure over time.
Is the Airtac SCJ50 Standard Cylinder SCJ50X55-20 the Right Cylinder?
Select the SCJ50X55-20 when you need to dial in a precise stroke end position on a machine. If 982 N of push force at 0.5 MPa is insufficient, stepping up to an SCJ63 bore provides 1559 N. For applications where the stroke is permanently fixed and never needs adjustment, a standard SC50 cylinder is a simpler, more cost-effective choice. This SCJ model is a direct replacement for another AirTAC SCJ50 cylinder with a 55 mm nominal stroke, 20 mm adjust range, PT ports, and basic mounting. For strokes of 300 mm or more, evaluate side-loading and consider an external guide rail to prevent rod bending.
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 SCJ50X55-20 FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. The push force is higher because the rod reduces the effective piston area on the return stroke. The maximum operating force at 0.9 MPa is 1767 N push.
A screw in the rear cap acts as an internal stop for the piston, allowing you to shorten the stroke end by up to 20 mm. It does not change the cylinder's force or speed; it only limits how far the rod extends. The nominal 55 mm stroke is the maximum possible extension.
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