The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X40-30 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, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X40-30 is a 50 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap adjusting screw lets you shorten the effective stroke by up to 30 mm without removing the cylinder from the machine, making it ideal for commissioning trials and fine-tuning end positions. At 0.5 MPa, it delivers 982 N of push force and 825 N of pull force, with a 20 mm piston rod and M16x1.5 rod thread.
This adjustable-stroke cylinder shares the same tie-rod body architecture as the fixed-stroke SC series, with a body length A of 194 mm. It operates on 40 µm filtered air from 0.15 to 1.0 MPa and includes an adjustable air cushion (21 mm) to decelerate the piston at stroke end. The standard PT1/4 port and TPU seals suit ambient temperatures from -20 to +70 °C.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X40-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 40 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. |
| ×40 | 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.
Adjust the 30 mm stroke-end screw during initial machine build to perfectly align the cylinder's end position with mating tooling, eliminating the need for shims or custom stops.
In clamping or pressing fixtures, use the rear screw to take up mechanical play as gripper pads or tooling surfaces wear over time, maintaining consistent contact force without reprogramming.
Quickly adapt the stroke for different product sizes on a packaging line by turning the rear adjuster, avoiding the downtime of a full cylinder swap when running short batches.
Choose the SCJ50X40-30 when you need to dial in a precise stroke end during setup or after tooling wear, without swapping the cylinder. If 825 N of pull force is marginal, stepping up to the 63 mm bore provides 1402 N of pull at the same 0.5 MPa. For applications that never require stroke adjustment, the fixed-stroke SC50X40 is a simpler, cost-effective alternative. This model replaces any AirTAC SCJ50X40-30 with PT ports and basic mounting; if your original had a magnet or bracket, match the suffix code exactly. For strokes over 300 mm in the 50 mm bore, consider an external guide to protect the 20 mm rod from side loads.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The pull force is lower because the 20 mm piston rod reduces the effective area on the return stroke.
Yes, if you need the 30 mm stroke-end adjustment. The SCJ50X40-30 has the same bore, nominal stroke, port (PT1/4), and tie-rod mounting footprint as the SC50X40. Ensure the slightly longer rear cap with the adjusting screw fits your available space.
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