The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X250-50 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 SCJ63X250-50 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the retract position by up to 50 mm without swapping the unit. With a 63 mm bore, it delivers 1559 N of push force and 1402 N of pull force at 0.5 MPa, making it a solid mid-range actuator for tasks that need repeatable end-stop tweaking.
The rear-cap adjusting screw shortens the stroke end within its 50 mm range, while the 20 mm diameter piston rod and 28 mm air cushion ensure smooth deceleration. The body length A(SCJ) is 197 mm, and the cylinder operates on filtered air from 0.15 to 1.0 MPa. Standard PT1/4 ports and an M16x1.5 rod thread keep integration simple.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X250-50 |
|---|---|
| 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.
During machine commissioning, the 50 mm adjusting screw lets technicians dial in the exact retract position for sensors, clamps, or stops without re-plumbing or changing the cylinder.
On packaging lines that handle multiple product sizes, the adjustable stroke allows operators to quickly reset the end position for different box heights or pallet layers.
In high-cycle pressing or clamping stations, the stroke can be lengthened slightly over time to compensate for pad or tooling wear, maintaining consistent contact force.
Choose this 63 mm bore when the 50 mm bore's 982 N push at 0.5 MPa is marginal and you need the next step up in force without moving to the larger 80 mm frame. If your application does not require on-machine stroke adjustment, the fixed-stroke SC63X250 is a simpler, lower-cost alternative. For a direct replacement, match an AirTAC SCJ63X250-50 with the same bore, 250 mm nominal stroke, 50 mm adjust range, PT ports, and basic mounting.
At a 250 mm stroke, rod bending under side load becomes a consideration. If the load is not guided externally, add an external guide rail or switch to a guided cylinder to protect the rod and bearing from premature wear.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder produces 1559 N pushing and 1402 N pulling. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 3118 N. Pull force is always lower because the rod reduces the effective piston area on the retract side.
Yes, this is a direct replacement for any AirTAC SCJ63 cylinder with a 250 mm nominal stroke and a 50 mm adjustable range. Confirm your port thread (PT), mounting style, and magnet option match. The adjustable stroke end and tie-rod construction are identical to the original design.
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