The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X250-50STC 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. Ø63mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X250-50STC is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that provides 50 mm of field-adjustable stroke reduction. This allows fine-tuning of the stroke end position from 200 mm up to the nominal 250 mm without swapping the cylinder. With a 20 mm rod and PT1/4 ports, it delivers 1559 N of push force at 0.5 MPa, scaling up to 2805 N at the maximum operating pressure of 0.9 MPa.
This specific model includes a built-in magnet for barrel-mounted sensors and a centre trunnion (TC) mounting, supplied with the TCM1 bracket for pivoting applications. The body length A(SCJ) is 197 mm, and the integrated air cushion is 28 mm long, providing reliable end-of-stroke deceleration. It is a genuine AirTAC component built for repeatable, adjustable positioning tasks.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X250-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 250 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, 28 mm |
| Max stroke | Up to 1500 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 | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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. |
|---|---|
| 63 | Bore size in mm. |
| ×250 | 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.
The 50 mm adjustment screw allows engineers to quickly dial in the exact stroke end position during machine commissioning, eliminating the need to swap fixed-stroke cylinders for trial-and-error fitting.
On packaging lines, use the adjustable stroke to accommodate different product sizes. The 250 mm nominal stroke with a 50 mm reduction range handles multiple box heights without mechanical stop changes.
In clamping or pressing fixtures, the stroke can be incrementally extended via the rear screw to compensate for tooling or pad wear over time, maintaining consistent clamp force without reprogramming.
Choose the SCJ63 bore when your application needs the 1559 N push force at 0.5 MPa it provides. If your force requirement is lower, stepping down to an SCJ50 bore reduces push force to 982 N; for higher demands, the SCJ80 bore offers 2513 N. The 50 mm adjustment range on this model is ideal for commissioning processes or format changes where the stop position needs significant variation. For fixed-stroke applications, a standard SC cylinder is a simpler, more cost-effective choice. When replacing this unit, match the 63 mm bore, 250 mm nominal stroke, 50 mm adjust range, PT port thread, centre trunnion mounting (F-SC63TC), and the integrated magnet (-S). For a 250 mm stroke, ensure the rod is not subjected to high side loads; an external guide or a guided cylinder is recommended if lateral forces are present.
Adjustable-stroke checklist
The push force is 1559 N at 0.5 MPa and 2805 N at 0.9 MPa. The pull force is lower due to the single 20 mm rod, providing 1402 N at 0.5 MPa. These values are identical to the fixed-stroke SC63 cylinder.
Yes, this is a direct replacement for any AirTAC SCJ63 cylinder with a 250 mm nominal stroke and 50 mm adjust range, provided the old unit also used a centre trunnion mount (TC), PT ports, and a magnet sensor option. The mounting bracket code is F-SC63TC.
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