The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-30TC 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.
The SCJ50X125-30 is a 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 50 mm bore, it delivers 982 N of push force at 0.5 MPa (1767 N at the 0.9 MPa maximum operating pressure), making it a strong mid-range actuator for tasks that need fine-tuned positioning without swapping the cylinder.
This model features a centre trunnion (TC) mount for pivoting applications and a 20 mm diameter piston rod with M16x1.5 male threads. The adjustable air cushion is 21 mm long, and the PT1/4 ports supply filtered air. The body length A(SCJ) is 194 mm plus the nominal 125 mm stroke, giving a compact installed envelope for its force class.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-30TC |
|---|---|
| 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.
| 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. |
| ×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.
Fine-tune the end position of a clamping or pressing tool during machine commissioning without dismounting the cylinder. The 30 mm screw adjustment lets technicians quickly dial in the exact stroke needed.
Adjust the stop position for different product sizes on a packaging or sorting line. The SCJ50X125-30 allows operators to accommodate format changes in minutes using only a wrench on the rear screw.
Take up mechanical play or tooling wear in a long-running fixture. The adjustable stroke end can be periodically reset to maintain precise part contact without replacing the actuator or adding shims.
Choose the SCJ50X125-30 when you need to dial in a precise stroke end during commissioning or format changes, with 30 mm of adjustment range. If your force requirement is lower, the SCJ40 series provides 628 N push at 0.5 MPa; for higher force, the SCJ63 steps up to 1559 N. This adjustable-stroke cylinder is ideal for end-stop tuning, but if your application needs a fixed, repeatable stroke with no field adjustment, the standard SC series is a simpler choice.
For replacement, match the 50 mm bore, 125 mm nominal stroke, 30 mm adjust range, PT port thread, and TC centre trunnion mounting (F-SC50TC bracket). The 125 mm stroke is well within the 1200 mm maximum standard stroke for this bore, so side-loading is not a primary concern, but always ensure the rod is aligned with the load path to prevent bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 982 N and the pull force is 825 N (due to the 20 mm rod area). At the maximum operating pressure of 0.9 MPa, the push force reaches 1767 N. The theoretical maximum at 1.0 MPa is 200 kgf.
Yes, if you need field-adjustable stroke. The SCJ50X125-30 matches the 50 mm bore and 125 mm nominal stroke of an SC50X125, but adds a rear adjusting screw for up to 30 mm of stroke-end reduction. Ensure the mounting (TC centre trunnion) and PT1/4 ports match your existing setup.
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