The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-30S 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X400-30S is a 50 mm bore double-acting single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. With a nominal 400 mm stroke and a 20 mm diameter piston rod, it delivers 982 N of push force and 825 N of pull force at 0.5 MPa, making it a solid mid-range actuator for applications where the end position must be tuned during commissioning or changeover without swapping the cylinder.
This model includes a built-in magnet (-S suffix), allowing easy clamp-on mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for precise end-of-stroke detection. The body length A(SCJ) is 194 mm, and the adjustable air cushion helps decelerate the piston quietly at both ends. Operating pressure ranges from 0.15 to 1.0 MPa on filtered air.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 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.
| 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×400 | 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.
The 30 mm rear screw adjustment lets technicians dial in the exact stroke end position on a new machine without fabricating custom hard stops, speeding up initial setup and debugging.
On packaging or assembly lines with multiple product sizes, the adjustable stroke allows a single actuator to be quickly reset for different push or placement depths, reducing downtime between batches.
In repetitive material-handling tasks, the stroke can be slightly extended over time to compensate for wear on gripper pads or tooling tips, maintaining consistent part contact without replacing the cylinder.
Choose the SCJ50X400-30S when you need a 50 mm bore with a 400 mm nominal stroke and the ability to fine-tune the stroke end by up to 30 mm. If your force requirement is lower, stepping down to a 40 mm bore (628 N push at 0.5 MPa) saves space; for more force, the 63 mm bore provides 1559 N push. This adjustable-stroke unit is a direct replacement for another AirTAC SCJ50X400-30S with a PT port and built-in magnet. For a fixed, non-adjustable stroke, the SC series is a simpler alternative. At 400 mm of stroke, ensure the rod is adequately supported against side loads—consider an external guide rail or a guided cylinder if lateral forces are present in the application.
Adjustable-stroke checklist
At the standard maximum operating pressure of 1.0 MPa, the theoretical push force is 1963 N. At the common 0.7 MPa supply pressure, it generates 1374 N of push force. The pull force is always lower due to the 20 mm rod area.
A fixed-stroke SC50X400 cylinder will fit the same mounting and port connections, but you will lose the 30 mm field-adjustable stroke-end feature. If your process requires periodic stroke tuning, you must replace it with another SCJ50X400-30S adjustable-stroke cylinder.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.