The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-50STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø50mm bore, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X400-50STC is a double-acting, single-rod pneumatic cylinder with a 50 mm bore, a nominal 400 mm stroke, and a 50 mm rear adjusting screw for fine-tuning the stroke end position without removing the cylinder. It delivers 982 N of push force and 825 N of pull force at 0.5 MPa, making it a strong mid-range actuator for applications where the stroke length must be dialled in precisely during commissioning or changeovers.
This model includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion pivot mount (-TC), supplied with the TCM1 bracket (F-SC50TC), allowing the cylinder to swing through an arc. The 20 mm piston rod features M16x1.5 threads, PT1/4 ports, and a 21 mm air cushion for smooth deceleration. The body length A(SCJ) is 194 mm plus the stroke.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 50 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. |
| -50 | 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.
In a packaging line handling boxes of varying lengths, the 50 mm adjustment range lets operators quickly dial in the correct end-stop position for each product run without mechanical disassembly.
The TC centre trunnion mount allows the cylinder to swing freely, making it ideal for actuating a diverter gate on a conveyor. The adjustable stroke fine-tunes the gate's open angle to prevent product jams.
For a welding fixture clamp, the 50 mm adjust screw compensates for wear on the clamp pads over time, maintaining consistent clamping force without needing to reprogram a servo or swap out shims.
Choose this SCJ50 when you need approximately 100 kgf of push force and the ability to adjust the stroke end by up to 50 mm on the machine. If your force requirement is lower, the SCJ40 provides 628 N of push; for a step up in power, the SCJ63 delivers 1559 N. This 400 mm stroke is well within the 1200 mm maximum for the 50 mm bore.
Because the stroke is 300 mm or longer, be mindful of side loading on the extended rod. For applications with significant lateral force, use an external guide rail or consider a guided cylinder instead. For direct replacement, match an SCJ50X400-50 with a centre trunnion mount, PT ports, and a magnet-equipped barrel. If you do not need the adjustable stroke, the fixed-stroke SC series is a simpler alternative.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this cylinder generates 982 N of push force and 825 N of pull force. The push force is higher because the single piston rod reduces the effective area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 200 kgf.
This SCJ50X400-50STC is a direct replacement for any AirTAC SCJ adjustable-stroke cylinder with a 50 mm bore, a 400 mm nominal stroke, a 50 mm adjustment range, PT ports, a centre trunnion (TC) mount, and a magnetic piston. Verify that your existing mounting bracket matches the F-SC50TC pattern.
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