The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X300-40 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. Ø80mm bore, 300mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X300-40 is an 80 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap adjusting screw provides up to 40 mm of stroke shortening, allowing precise end-position tuning without removing the cylinder. At 0.5 MPa, it delivers 2513 N of push force and 2268 N of pull force, driven through a 25 mm diameter piston rod.
This tie-rod cylinder uses PT3/8 ports and features an adjustable air cushion for smooth deceleration. The body length A(SCJ) is 239 mm, accommodating a nominal 300 mm stroke that falls well within the 1500 mm maximum standard stroke for this bore. It is configured with a basic mount, TPU seals, and standard PT threads.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X300-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 40 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. |
| ×300 | 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.
Engineers can precisely dial in the end-stop position on a new assembly line using the 40 mm adjustment range, eliminating the need to fabricate custom shims or hard stops.
Quickly adapt a pneumatic pusher or diverter for different product widths on a packaging conveyor by adjusting the stroke end screw, minimizing downtime between production runs.
In high-cycle clamping or pressing operations, the adjustable stroke can be used to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent applied position.
Choose the SCJ80X300-40 when you need to fine-tune the stroke end position during commissioning or changeovers. If 2513 N of push force at 0.5 MPa is insufficient, stepping up to the 100 mm bore provides 3927 N. For applications requiring a fixed, non-adjustable stroke, the standard SC80X300 is a direct alternative. A direct replacement must match the 80 mm bore, 300 mm nominal stroke, 40 mm adjust range, PT3/8 ports, and basic mounting.
For this 300 mm stroke length, consider the potential for side loading and rod bending. If the load is not guided, an external guide rail or switching to a guided cylinder is recommended to protect the rod and seals from premature wear.
Adjustable-stroke checklist
The push force is 2513 N at 0.5 MPa and 4523 N at the maximum operating pressure of 0.9 MPa. The pull force is lower due to the single 25 mm rod, providing 2268 N at 0.5 MPa.
A rear-cap screw lets you shorten the stroke end by up to 40 mm. Select this SCJ model when you anticipate needing to fine-tune the piston's end position on the machine, rather than using a fixed-stroke SC cylinder which requires external stops for any adjustment.
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