Airtac SCJ50 Standard Cylinder SCJ50X90-40
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X90-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø50mm bore, 90mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke90 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X90-40
The SCJ50X90-40 is a 50 mm bore double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 40 mm of field-adjustable stroke-end reduction. This lets you dial in the exact stop position for commissioning, format changes, or wear compensation without replacing the cylinder or adding external hard stops. At 0.5 MPa it delivers 982 N push and 825 N pull, and at the maximum operating pressure of 0.9 MPa push force reaches 1767 N.
Built on the standard SC tie-rod platform, the SCJ50 body length A is 194 mm, with a 20 mm rod and M16x1.5 rod thread. The PT1/4 ports feed an adjustable air cushion (21 mm) that decelerates the piston near stroke end. This model is rated for strokes up to 1200 mm and operates on 40 µm filtered air from 0.15 to 1.0 MPa, with a speed range of 30-800 mm/s.
Airtac SCJ50 Standard Cylinder SCJ50X90-40 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X90-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 90 mm |
| Stroke adjustment | Up to 40 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 SCJ50X90-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×90 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ50X90-40 Is Used
Commissioning & Setup
During machine bring-up, the 40 mm rear screw lets technicians fine-tune the stroke end stop without disconnecting air lines or swapping cylinders, cutting setup time on multi-station assembly cells.
Product Changeover
On packaging or sorting lines that handle different box sizes, operators can quickly adjust the push stroke to match a new format, eliminating the need to stock multiple fixed-stroke cylinders.
Wear Compensation
In high-cycle clamping or pressing fixtures, the adjustable stroke end compensates for pad wear or tooling creep over time, maintaining consistent clamp force without mechanical shimming.
Is the Airtac SCJ50 Standard Cylinder SCJ50X90-40 the Right Cylinder?
Choose the SCJ50 when you need a mid-range force class and the ability to tweak stroke end position on the machine. If 982 N push at 0.5 MPa is marginal, stepping up to the 63 mm bore gives 1559 N push; if space or weight is tight, the 40 mm bore delivers 628 N. For applications that never need stroke adjustment, the fixed-stroke SC50 is a simpler, slightly shorter alternative. When side loads are present, add an external guide rail or switch to a guided cylinder.
For direct replacement, match the 50 mm bore, 90 mm nominal stroke, 40 mm adjust range, PT port thread, and basic mounting. If you need position sensing, order the -S magnet variant and pair it with CMSG/DMSG/EMSG sensors. The SCJ mounting system accepts FA front flange, LB foot, or TC centre trunnion accessories (part codes F-SC50FA, F-SC50LB, F-SC50TC).
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ50X90-40 FAQ
At 0.5 MPa the push force is 982 N and pull force is 825 N. At 0.7 MPa push rises to 1374 N, and at the 0.9 MPa maximum operating pressure it reaches 1767 N. Because it is a single-rod cylinder, push force is always higher than pull force due to the rod area.
The rear-cap adjusting screw sets the stroke end position within a 40 mm range; the nominal 90 mm stroke is the maximum. You can replace a fixed-stroke SC of the same bore and port thread with an SCJ, provided the SCJ's nominal stroke covers your required range and the adjust screw does not interfere with your mounting. The SCJ body is slightly longer than the equivalent SC to accommodate the screw mechanism.
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