Airtac SCJ50 Standard Cylinder SCJ50X250-30S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-30S 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, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke250 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X250-30S
The SCJ50X250-30S is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a nominal 250 mm stroke, featuring a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. This allows precise fine-tuning of the piston stop position without removing the cylinder from the machine. At 0.5 MPa, it delivers 982 N of push force and 825 N of pull force, driven by a 20 mm diameter piston rod, making it a robust actuator for medium-duty linear applications.
This model includes a built-in magnet (suffix -S), enabling direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for reliable end-of-stroke detection. The cylinder body length A(SCJ) is 194 mm, and it features an adjustable air cushion of 21 mm for smooth deceleration. It uses PT1/4 port threads and an M16x1.5 rod thread, operating on 40 µm filtered air within a standard temperature range of -20 to +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X250-30S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 250 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 SCJ50X250-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×250 | 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 SCJ50X250-30S Is Used
Commissioning & Setup
Fine-tune the end-stop position of a material pusher on a new assembly line by up to 30 mm without re-machining mounts, speeding up the initial system debug and validation phase.
Format Changeovers
Quickly adjust the stroke of a diverter gate on a packaging conveyor to handle different box widths, eliminating the need for mechanical stop adjustments and reducing changeover downtime.
Wear Compensation
Compensate for the gradual wear of a gripper jaw or a tooling tip by incrementally adjusting the cylinder's stroke end, maintaining consistent clamping force and part contact without replacing the actuator.
Is the Airtac SCJ50 Standard Cylinder SCJ50X250-30S the Right Cylinder?
Choose the SCJ50X250-30S when you need a 982 N push force at 0.5 MPa and the ability to shorten the stroke end by up to 30 mm during commissioning or changeovers. If your force requirement increases, stepping up to a 63 mm bore (SCJ63X250-30S) provides 1559 N of push force at the same pressure. For applications needing a fixed, non-adjustable stroke, the standard SC50X250 cylinder is a simpler, cost-effective alternative. This cylinder is a direct replacement for an existing AirTAC SCJ50X250-30S with a PT port, basic mounting, and magnet.
For this 250 mm stroke length, ensure the load is guided to prevent side-loading and rod bending. If external guidance is not feasible, consider a guided cylinder assembly to protect the rod and bearing seals from premature wear.
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 SCJ50X250-30S FAQ
At the standard 0.5 MPa operating pressure, the push force is 982 N and the pull force is 825 N. The maximum push force at the 0.9 MPa operating limit is 1767 N. The theoretical maximum force at 1.0 MPa is 200 kgf.
A rear-cap adjusting screw sets the physical end-stop for the piston's return stroke, allowing you to shorten the stroke by up to 30 mm from the 250 mm nominal maximum. This is a mechanical stop, not a locking device. The cylinder will not hold its position if air pressure is lost; an external rod lock or pilot-operated check valve is required for load holding.
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 SCJ50X250-30S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.