The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X75-30N is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø80mm bore, 75mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X75-30N is a double-acting, single-rod pneumatic cylinder that delivers a push force of 2513 N at 0.5 MPa, making it a capable actuator for medium-to-heavy industrial tasks. Its defining feature is the rear-cap adjusting screw, which provides up to 30 mm of stroke-end adjustment, allowing engineers to fine-tune the piston's stopping position on the fly without disassembling the machine.
This model is built with a 25 mm diameter piston rod and PT3/8 ports, featuring NBR (nitrile) seals as standard. The tie-rod construction houses an adjustable air cushion (28 mm) for smooth deceleration, and the cylinder body has a length of 239 mm (A dimension). It operates reliably within a standard temperature range of -20 to +70 °C and a pressure range of 0.15 to 1.0 MPa.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X75-30N |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 30 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. |
| ×75 | Nominal (maximum) stroke length in mm. |
| -30 | 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 30 mm adjustment range on the SCJ80X75-30N allows robotic end-of-arm tooling to be precisely dialed in for different product batches, eliminating the need for mechanical shims during changeovers.
In material handling, a mechanical stop can wear down over time. This cylinder's rear screw lets operators quickly take up the slack to maintain exact positioning of a diverter gate without replacing the stop.
When clamping workpieces of slightly varying thicknesses on a fixture, the stroke-end adjuster sets the final clamp position, preventing over-travel that could damage a thinner part while ensuring a full stroke on a thicker one.
Select the SCJ80 when your application requires a push force around 2513 N at 0.5 MPa. If your force requirements are lower, stepping down to the SCJ63 bore, which provides 1559 N of push force, can reduce air consumption and physical size. For higher demands, the SCJ100 bore offers a substantial increase to 3927 N of push force.
This adjustable-stroke model is the correct choice over a fixed-stroke SC cylinder when you need to compensate for tooling wear or fine-tune an end position during commissioning. For replacement, ensure the new unit matches the 80 mm bore, 75 mm nominal stroke, 30 mm adjustment range, PT port thread, and NBR seal material. If the rod is subjected to significant side loads, an external guide rail or a switch to a guided cylinder is recommended to prevent rod bending and premature seal failure.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder generates a push force of 2513 N and a pull force of 2268 N. The push force is greater because the single piston rod reduces the effective area on the return side. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5026 N.
A screw mechanism in the rear cap acts as an internal, movable end-stop for the piston. By turning the screw, you can shorten the cylinder's outward stroke by up to 30 mm from its nominal 75 mm maximum. This is a mechanical stroke limiter only; it does not adjust the cylinder's speed or force, and it will not hold the piston in place if air pressure is lost.
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