The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X185-50 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, 185mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X185-50 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the piston stop position by up to 50 mm without removing the cylinder from the machine. With a 63 mm bore and 20 mm rod, it delivers 1559 N of push force and 1402 N of pull force at 0.5 MPa, making it a capable mid-range actuator for tasks that need precise mechanical end-point setting.
This adjustable-stroke model uses a rear-cap adjusting screw to shorten the nominal 185 mm stroke, ideal for commissioning trials, format changeovers, or taking up mechanical wear over time. It features a 28 mm air cushion for smooth deceleration, PT1/4 ports, and an M16x1.5 rod thread. The body length A is 197 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjustment mechanism.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X185-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 185 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. |
| ×185 | 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 operators to dial in the exact stroke end position during machine commissioning, compensating for stack-up tolerances in tooling without needing to swap the cylinder.
On packaging or sorting lines, quickly adjust the pusher stroke to handle different product sizes. The SCJ63X185-50 provides the mid-range force needed for diverting cartons or trays.
In clamping or pressing fixtures, the adjustable stroke can be periodically shortened to take up mechanical wear on pads or linkages, maintaining consistent clamping force without reprogramming the machine.
Choose this 63 mm bore when your application needs more force than the 40 mm bore (628 N push at 0.5 MPa) but does not require the bulk of an 80 mm cylinder (2513 N push). The 50 mm adjustment range is particularly useful where the final stroke length is determined during machine setup. If your stroke is fixed and never needs field changes, the standard SC series offers a simpler, more compact solution. For a direct replacement, match the SCJ63 bore, 185 mm nominal stroke, 50 mm adjust range, PT port thread, basic mounting, and no magnet.
At a 185 mm stroke, this cylinder is well within standard limits, but always ensure the rod is not subjected to excessive side loading. If lateral forces are present, pair the cylinder with an external guide rail or consider a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
A rear-cap screw lets you shorten the stroke end by up to 50 mm from the nominal 185 mm maximum. It is a mechanical stop, not a force or speed control. Use the SCJ when you need to fine-tune the stroke on-site; if your stroke is always fixed, the SC series is a more cost-effective choice.
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