The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø63mm bore, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X350-40 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, built on a robust tie-rod design. Its rear-cap adjusting screw provides up to 40 mm of stroke-end reduction, allowing you to fine-tune the 350 mm nominal stroke for commissioning or format changes without swapping the cylinder. With a 20 mm piston rod and PT1/4 ports, it delivers a substantial 1559 N of push force at 0.5 MPa, scaling to 2805 N at the maximum operating pressure of 0.9 MPa.
This genuine AirTAC cylinder includes an adjustable air cushion for smooth deceleration and operates reliably between -20 and +70 °C on 40 µm filtered air. The basic mounting configuration provides a clean starting point for integration, with a body length of 197 mm plus the stroke. The 40 mm adjustment range is ideal for applications requiring precise end-stop positioning, such as clamping mechanisms or material stops that experience wear over time.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 40 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. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -40 | 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 40 mm rear adjustment screw lets technicians precisely set the stroke end during machine commissioning without iterative cylinder swaps, accelerating the setup of new packaging or assembly lines.
In clamping or pressing fixtures, the adjustable stroke can be extended over time to compensate for wear on tooling or contact surfaces, maintaining consistent clamping force without replacing the actuator.
For machines processing multiple product sizes, the SCJ63X350-40 enables quick stroke-end adjustments to handle different box heights or part thicknesses, reducing changeover downtime compared to fixed-stroke cylinders.
Select the SCJ63X350-40 when you need a 63 mm bore's force class—1559 N push at 0.5 MPa—combined with the ability to dial in the stroke end on the machine. If your force requirement is lower, stepping down to a 50 mm bore (982 N push) saves space and air consumption; for higher force, the 80 mm bore (2513 N push) is the next step up. The adjustable-stroke SCJ is the right choice over a fixed-stroke SC when your application involves commissioning trials, format changeovers, or a need to compensate for wear without adding external hard stops.
For a direct replacement, match the 63 mm bore, 350 mm nominal stroke, 40 mm adjustment range, PT port thread, and basic mounting. At this 350 mm stroke, be mindful of side-loading on the 20 mm rod. If the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and ensure long seal life. This model accepts the SCJ mounting subset: FA front flange (F-SC63FA), LB foot mount (F-SC63LB), or TC centre trunnion (F-SC63TC with TCM1 bracket).
Adjustable-stroke checklist
At 0.5 MPa, this single-rod cylinder generates 1559 N of push force (full bore area) and 1402 N of pull force (annular area minus the 20 mm rod). At the maximum operating pressure of 0.9 MPa, the push force increases to 2805 N. The push force is always greater than the pull force due to the single-rod design.
A rear-cap adjusting screw allows you to shorten the stroke end by up to 40 mm from the 350 mm nominal maximum. This is a mechanical stop adjustment, not a speed or force control. Choose the SCJ over a fixed-stroke SC when you need to fine-tune the end position on the machine for tasks like commissioning, wear take-up, or format changes, eliminating the need to stock multiple fixed-stroke lengths.
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