Airtac SCJ50 Standard Cylinder SCJ50X75-20
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X75-20 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke75 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X75-20
The SCJ50X75-20 is a tie-rod, double-acting single-rod cylinder that delivers a push force of 982 N at 0.5 MPa, making it a capable mid-range actuator for tasks needing on-machine stroke tuning. Its rear-cap adjusting screw provides up to 20 mm of stroke-end reduction, allowing the effective travel to be dialled in between 55 mm and the nominal 75 mm without removing the cylinder.
With a 20 mm piston rod and M16x1.5 rod thread, the unit uses PT1/4 ports and incorporates a 21 mm air cushion for smooth end-of-stroke deceleration. The body length A is 194 mm, and the standard operating pressure spans 0.15–1.0 MPa, suiting it for general industrial automation where commissioning tweaks or format changes demand a flexible stop position.
Airtac SCJ50 Standard Cylinder SCJ50X75-20 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X75-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 75 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 SCJ50X75-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SCJ50X75-20 Is Used
Commissioning & Setup
Fine-tune the end position of a clamp or stop during machine commissioning by adjusting the rear screw, eliminating the need to fabricate shims or relocate external sensors for small stroke changes.
Product Changeover
Quickly adapt a diverter gate's throw distance when switching between product sizes on a packaging line, using the 20 mm adjustment range to set the exact travel needed without swapping the cylinder.
Wear Compensation
Take up mechanical play in a pressing or clamping fixture over time by advancing the stroke end with the adjusting screw, maintaining consistent contact force as tooling or pads wear.
Is the Airtac SCJ50 Standard Cylinder SCJ50X75-20 the Right Cylinder?
Choose the SCJ50X75-20 when you need to fine-tune the stroke end point by up to 20 mm directly on the machine, avoiding external hard stops. If the force requirement is lower, stepping down to the 40 mm bore reduces push force to 628 N at 0.5 MPa; for higher force, the 63 mm bore offers 1559 N. Should your application need a fixed, non-adjustable stroke, the standard SC series is a simpler alternative.
The exact replacement match is an AirTAC SCJ adjustable-stroke cylinder with a 50 mm bore, 75 mm nominal stroke, 20 mm adjust range, PT ports, and basic mounting. For strokes of 300 mm or more, evaluate side-load conditions and consider an external guide rail or a guided cylinder to protect the rod bearing from bending moments.
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 SCJ50X75-20 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 single rod reduces the effective piston area on the return stroke. Maximum push force at the 0.9 MPa operating limit is 1767 N.
A screw in the rear cap lets you shorten the stroke end by up to 20 mm. The nominal 75 mm stroke is the maximum; turning the screw moves the piston's stopping point inward, giving you an effective stroke anywhere between 55 mm and 75 mm. It does not alter the cylinder's force or speed.
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