The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X250-50S 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, 250mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X250-50S is an 80 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke. A rear-cap adjusting screw provides up to 50 mm of stroke-end reduction, allowing the effective stroke to be fine-tuned anywhere between 200 mm and the 250 mm nominal maximum without replacing the cylinder. This model includes a built-in magnet for direct mounting of CMSG/DMSG/EMSG sensors.
At 0.5 MPa, it delivers 2513 N of push force and 2268 N on the pull stroke, with a 25 mm diameter piston rod and PT3/8 ports. The cylinder body length (A dimension) is 239 mm, and it features a 28 mm adjustable air cushion for smooth deceleration. The standard TPU seals are rated for operating temperatures from -20 to +70 °C.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X250-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 250 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. |
| ×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.
The 50 mm adjustment range allows engineers to precisely set the stroke end position on a new machine without machining custom stops, significantly reducing setup time during initial commissioning.
Ideal for conveyor diverters or product pushers handling different box sizes. Operators can quickly adjust the cylinder's reach by up to 50 mm to accommodate a new product format on the line.
In high-cycle clamping or pressing fixtures, the adjustable stroke can be used to take up mechanical wear on tooling contact surfaces, maintaining consistent clamp force and cycle timing over the life of the fixture.
Choose the SCJ80X250-50S when you need substantial force for medium-to-heavy automation tasks but require the ability to dial in the exact stroke end position during commissioning or for format changes. If 2513 N of push force at 0.5 MPa is insufficient, the next step up is the 100 mm bore SCJ series, which provides 3927 N of push force. For applications where the stroke is fixed and never needs field adjustment, a standard SC80X250 cylinder is a more economical choice.
For a 250 mm stroke, be mindful of side loads which can cause rod bending. If the load is not guided, use an external guide rail or consider a guided cylinder. This model is a direct replacement for any AirTAC SCJ80X250-50S cylinder with a PT port and basic mounting. The built-in magnet (S suffix) allows for easy integration of reed or solid-state sensors for end-of-stroke detection.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 2513 N, and the pull force is 2268 N. At the maximum operating pressure of 0.9 MPa, the push force increases to 4523 N. These values are identical to a fixed-stroke SC80 cylinder, as the adjustable stroke mechanism does not alter the piston area.
A screw in the rear end cap acts as an internal, adjustable end-stop for the piston. Turning the screw changes the retracted stroke end position within a 50 mm range. This allows you to shorten the stroke from the nominal 250 mm down to 200 mm. It does not affect the cylinder's force or speed, only its physical stopping point.
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