Airtac SCJ50 Standard Cylinder SCJ50X50-20H
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X50-20H 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke50 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X50-20H
The SCJ50X50-20H is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw, allowing you to fine-tune the stroke end position by up to 20 mm without replacing 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 strong performer for medium-duty automation tasks. The Viton (FKM) seals extend the operating temperature range to 0–150 °C, ideal for hot environments.
This model uses a PT1/4 port and an M16x1.5 rod thread, with a 21 mm air cushion at each end for smooth deceleration. The body length A is 194 mm, slightly longer than a fixed-stroke SC to house the adjustment mechanism. It is a genuine AirTAC tie-rod cylinder, not an ISO 15552 profile, so dimensional interchangeability is limited to other SCJ cylinders of the same configuration.
Airtac SCJ50 Standard Cylinder SCJ50X50-20H Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X50-20H |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 50 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 SCJ50X50-20H
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×50 | 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 SCJ50X50-20H Is Used
Hot Press Fine-Tuning
Adjust the stroke end in high-temperature platen presses to set precise closure gaps, with the Viton seals ensuring reliable operation up to 150 °C.
Conveyor Stop Adjustment
Dial in the exact stop position for different box sizes on a packaging line by turning the rear screw, eliminating the need for mechanical shims.
Weld Fixture Compensation
Compensate for electrode tip wear in automated welding cells by incrementally extending the stroke end, maintaining consistent clamping force.
Is the Airtac SCJ50 Standard Cylinder SCJ50X50-20H the Right Cylinder?
Choose the SCJ50 when you need field-adjustable stroke end positioning in a 50 mm bore package. If your force requirement is lower, the SCJ40 provides 628 N of push at 0.5 MPa; for higher force, the SCJ63 delivers 1559 N. This adjustable-stroke unit is the right choice over a fixed-stroke SC when you anticipate commissioning tweaks, format changes, or need to compensate for tooling wear without swapping the cylinder. For a direct replacement, match the 50 mm bore, 50 mm nominal stroke, 20 mm adjustment range, PT1/4 ports, and Viton seals. The SCJ mounting system accepts Basic, FA, LB, or TC mounts, but not FB or clevis styles.
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 SCJ50X50-20H FAQ
At 0.5 MPa, it generates 982 N of push force and 825 N of pull force. The maximum push force at the 0.9 MPa operating limit is 1767 N. The pull force is lower because the rod reduces the piston area on the return stroke.
Yes, if the bore, port size, and mounting style match. The SCJ body is slightly longer to house the adjustment screw, so check the 194 mm body length against your available space. It is a direct functional upgrade when you need field adjustability.
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 SCJ50X50-20H
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.