The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X275-40 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, 275mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X275-40 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke family. With an 80 mm bore and a 275 mm nominal stroke, it delivers a push force of 2513 N at 0.5 MPa, making it a strong mid-range actuator for industrial tasks. The defining feature is the rear-cap adjusting screw, which provides up to 40 mm of field-adjustable stroke-end reduction, allowing machine builders to fine-tune the piston stop position without swapping the cylinder or adding external hard stops.
This model uses a 25 mm diameter piston rod and PT3/8 pneumatic ports. The tie-rod construction incorporates an adjustable air cushion (28 mm long) to decelerate the piston near the end of its travel, reducing impact and noise. The body length A for this SCJ series is 239 mm, and the standard operating speed range is 30-800 mm/s. It is a genuine AirTAC component, built for reliable service in filtered-air systems up to 1.0 MPa.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X275-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 275 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. |
| ×275 | 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.
The 40 mm adjustable stroke end allows technicians to precisely dial in the piston stop position during initial machine setup, eliminating the need to fabricate shims or reposition external sensors.
On packaging or sorting lines, operators can quickly adjust the stroke to accommodate different product sizes or pallet patterns without stopping production for a cylinder swap, reducing downtime.
In clamping or pressing fixtures, the adjusting screw can be advanced over time to take up mechanical wear in tooling or linkages, maintaining consistent clamp force and position without replacing the actuator.
Select the SCJ80X275-40 when you need a 275 mm stroke with the ability to shorten the end position by up to 40 mm during commissioning or changeovers. If your force requirement is lower, consider stepping down to the 63 mm bore SCJ63 series, which provides 1559 N of push at 0.5 MPa. For higher force, the 100 mm bore SCJ100 series offers 3927 N. A fixed-stroke SC80 cylinder is the better choice if the stroke length is permanently fixed, as it eliminates the adjusting mechanism. For precise, side-loaded applications, especially with a stroke exceeding 300 mm, evaluate an external guide rail or a guided cylinder to prevent rod bending.
As a direct replacement, this unit matches another AirTAC SCJ80X275-40 with the same 40 mm adjustable range, PT3/8 ports, and basic mounting. The SCJ series accepts a subset of SC mounting accessories: FA front flange, LB foot mount, or TC centre trunnion with a TCM1 bracket. Note that FB flange and CA/CB clevis mounts are not available for this adjustable-stroke cylinder.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this 80 mm bore cylinder generates 2513 N of push force and 2268 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. The maximum push force at 0.9 MPa is 4523 N.
You can replace a fixed-stroke SC80 cylinder with an SCJ80X275-40 if you need the 40 mm adjustable stroke-end feature. Ensure the replacement matches the 275 mm nominal stroke, PT3/8 port thread, and your required mounting style (basic, FA, LB, or TC). The SCJ body is slightly longer to house the adjusting screw, so verify the available space in your machine.
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