Airtac SCJ50 Standard Cylinder SCJ50X125-30S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-30S 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, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke125 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X125-30S
The SCJ50X125-30S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, providing 982 N of push force at 0.5 MPa. The rear-cap adjusting screw allows the stroke end position to be shortened by up to 30 mm without replacing the cylinder, ideal for commissioning fine-tuning and format changeovers. This model features a 20 mm piston rod and PT1/4 ports.
A built-in magnet (denoted by the -S suffix) allows for direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for precise end-of-stroke detection. The cylinder uses a durable TPU seal as standard, operates within a -20 to +70 °C temperature range, and has a body length of 194 mm. It delivers a theoretical maximum push force of 1767 N at 0.9 MPa.
Airtac SCJ50 Standard Cylinder SCJ50X125-30S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 125 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 SCJ50X125-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×125 | 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 SCJ50X125-30S Is Used
Commissioning & Setup
Fine-tune the end-stop position during initial machine setup by adjusting the rear screw, eliminating the need to shim or reposition the cylinder body.
Format Changeovers
Quickly adapt the stroke length for different product sizes on a packaging line by adjusting the screw stop, reducing downtime between batches.
Wear Compensation
Compensate for mechanical wear in tooling or fixtures over time by incrementally adjusting the cylinder's stroke end to maintain precise positioning.
Is the Airtac SCJ50 Standard Cylinder SCJ50X125-30S the Right Cylinder?
Select the SCJ50X125-30S when you need to fine-tune the stroke end position on a machine without swapping the cylinder. For higher force requirements, stepping up to the 63 mm bore provides 1559 N of push force at 0.5 MPa. If a fixed stroke is acceptable and cost is a primary concern, the standard SC50X125 cylinder is a direct alternative. For replacement, match the 50 mm bore, 125 mm nominal stroke, 30 mm adjustment range, PT port thread, and the S magnet option. This cylinder uses a basic mount; if a pivoting action is required, consider the SCJ50X125-30STC model with a centre trunnion.
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 SCJ50X125-30S FAQ
At the standard 0.5 MPa operating pressure, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N.
Yes, the -S suffix means this model has a built-in magnet. It is fully compatible with AirTAC CMSG, DMSG, and EMSG series sensors, which clamp directly onto the cylinder's tie-rod barrel.
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 SCJ50X125-30S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.