The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X900-50S 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. Ø80mm bore, 900mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X900-50S is an 80 mm bore double-acting single-rod cylinder with a rear-cap adjusting screw that provides up to 50 mm of field-adjustable stroke-end reduction. Its 25 mm diameter piston rod delivers a push force of 2513 N at 0.5 MPa, making it a capable mid-range actuator for applications requiring on-machine fine-tuning without cylinder swaps.
This model includes a built-in magnet (suffix -S), allowing direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for reliable end-of-stroke detection. The standard PT3/8 port and 28 mm air cushion ensure smooth deceleration, with a body length A of 239 mm providing a compact footprint for its 900 mm nominal stroke.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X900-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 900 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
| 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 | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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. |
|---|---|
| 80 | Bore size in mm. |
| ×900 | 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 rear screw adjustment lets technicians fine-tune the stroke end position during initial machine commissioning, eliminating the need to swap cylinders or fabricate external hard stops to achieve the exact travel required.
On packaging or assembly lines running multiple product sizes, operators can quickly adjust the cylinder's stroke end to match a new format, reducing changeover time and the inventory of fixed-stroke cylinders.
In high-cycle clamping or pressing operations, the adjustable stroke can be periodically tweaked to compensate for tooling or pad wear, maintaining consistent clamp force and part quality without immediate replacement of wear parts.
Choose the SCJ80 when you need the 2513 N push force at 0.5 MPa that an 80 mm bore provides. If your load requires a more compact actuator, stepping down to the 63 mm bore yields 1559 N of push force; for heavier work, the 100 mm bore offers 3927 N. The 50 mm adjustable stroke range is ideal for commissioning trials or format changeovers where the exact end position must be dialed in on the machine.
For a direct replacement, match this model's 80 mm bore, 900 mm nominal stroke, 50 mm adjust range, PT3/8 port thread, basic mounting, and built-in magnet. At 900 mm of stroke, be mindful of side-loading on the 25 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. If a fixed stroke is all that is needed, the standard SC80X900-S is a simpler alternative.
Adjustable-stroke checklist
The push force at 0.5 MPa is 2513 N, and at the maximum operating pressure of 0.9 MPa it reaches 4523 N. The pull force is lower due to the 25 mm rod area, providing 2268 N at 0.5 MPa. These values are identical to the fixed-stroke SC80 cylinder.
Yes, the -S suffix means this SCJ80 has a built-in magnet. It is fully compatible with AirTAC's CMSG, DMSG, and EMSG series sensors, which clamp directly onto the cylinder's tie-rod barrel for piston position sensing.
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