Airtac SCJ50 Standard Cylinder SCJ50X70-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X70-20S 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, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke70 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X70-20S
The SCJ50X70-20S is a double-acting, single-rod pneumatic cylinder with a 20 mm field-adjustable stroke range, letting you fine-tune the end position without swapping the unit. With a 50 mm bore and 20 mm rod, it delivers 982 N of push force at 0.5 MPa, making it a solid mid-range actuator for tasks that need repeatable end-stop adjustment.
This model includes a built-in magnet, so you can mount CMSG, DMSG, or EMSG reed and solid-state sensors directly onto the tie-rod barrel for reliable end-of-stroke detection. The PT1/4 port and M16x1.5 rod thread keep it compatible with common pneumatic fittings and tooling.
Airtac SCJ50 Standard Cylinder SCJ50X70-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X70-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 70 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 SCJ50X70-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×70 | 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 SCJ50X70-20S Is Used
Commissioning Trials
Adjust the stroke end by up to 20 mm during machine setup to perfectly align with mating parts without re-plumbing the cylinder.
Format Changeover
Quickly adapt the actuator's end position for different product sizes on a packaging or assembly line, reducing downtime between batches.
Wear Compensation
Take up mechanical play or seal wear over time by advancing the rear adjusting screw, maintaining consistent clamping or pressing force.
Is the Airtac SCJ50 Standard Cylinder SCJ50X70-20S the Right Cylinder?
Choose the SCJ50X70-20S when you need to dial in the stroke end on the machine. If 982 N of push force at 0.5 MPa is not enough, stepping up to the 63 mm bore provides 1559 N. For a fixed-stroke solution without the adjusting screw, the standard SC series is a direct alternative. To replace this cylinder, match the 50 mm bore, 70 mm nominal stroke, 20 mm adjust range, PT port thread, basic mounting, and the -S magnet option.
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 SCJ50X70-20S FAQ
At 0.5 MPa, it generates 982 N of push force and 825 N of pull force. The push force is higher because the single rod reduces the piston area on the return side. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1964 N.
A screw in the rear cap lets you shorten the stroke end by up to 20 mm from the nominal 70 mm. It sets a mechanical stop for the piston, so you can fine-tune the extension without affecting the cylinder's force or speed capability.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SCJ Adjustable-Stroke Cylinders
Request a Quote for Airtac SCJ50 Standard Cylinder SCJ50X70-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.