The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X250-20STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø63mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X250-20STC is a double-acting, single-rod pneumatic cylinder that delivers 1559 N of push force at 0.5 MPa, making it a robust choice for medium-duty automation tasks. Its defining feature is a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction, allowing engineers to fine-tune the 250 mm nominal stroke without dismounting the cylinder or adding external hard stops.
This model is equipped with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion (TC) mount, supplied with the TCM1 bracket (F-SC63TC), which is ideal for applications requiring the cylinder to pivot. The 20 mm rod and 28 mm air cushion ensure smooth, reliable operation, with a body length A(SCJ) of 197 mm.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X250-20STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 20 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. |
| -20 | 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.
Quickly adjust the end position by up to 20 mm to accommodate different product sizes on a packaging line without stopping production for a cylinder swap.
Fine-tune the final clamping depth or pressing stroke in a fixture, compensating for part tolerance variations to ensure consistent quality.
Adjust the stroke end to take up mechanical wear in a linkage or tooling over time, maintaining precise machine timing without replacing parts.
Choose the SCJ63X250-20STC when you need a 63 mm bore's force profile (1559 N push at 0.5 MPa) and the ability to pivot the cylinder body. If your force requirements are lower, stepping down to a 50 mm bore reduces push force to 982 N; for higher demands, an 80 mm bore provides 2513 N. The TC trunnion mount is the correct choice for swinging loads, but if you need a fixed, surface-mounted installation, consider the same cylinder with an LB foot mount.
For a direct replacement, match the SCJ63 bore, 250 mm nominal stroke, 20 mm adjustment range, PT port thread, TC mount, and built-in magnet. At this 250 mm stroke, ensure the rod is not subjected to significant side loads; if lateral forces are present, an external guide rail or a switch to a guided cylinder is necessary to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder provides a push force of 1559 N and a pull force of 1402 N. The maximum push force at 0.9 MPa is 2805 N. The pull force is lower due to the area of the 20 mm piston rod.
A screw in the rear cap acts as an internal, adjustable end-stop for the piston. Turning the screw shortens the stroke by up to 20 mm from the 250 mm nominal maximum. It sets the physical stroke end, not the force or speed, and does not lock the piston in place when air pressure is removed.
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