The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X300-10S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø40mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X300-10S is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 10 mm of field-adjustable stroke reduction. This lets commissioning engineers fine-tune the end position without swapping the cylinder or machining external stops. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa, making it a capable mid-range actuator for positioning tasks.
This model includes a built-in magnet (suffix -S), so standard CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The body length A is 185 mm, the PT1/4 port keeps plumbing compact, and the adjustable air cushion decelerates the 300 mm stroke smoothly. It is a genuine AirTAC component built for repeatable, on-machine tuning.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X300-10S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 10 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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, 21 mm |
| Max stroke | Up to 1200 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 | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -10 | 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 10 mm rear adjuster lets technicians dial in the exact stroke end position during machine commissioning, eliminating the need to shim or reposition the cylinder body.
On packaging or assembly lines, operators can quickly tweak the stroke to accommodate different product sizes without mechanical disassembly, reducing downtime between batches.
In clamping or pressing fixtures, the screw adjusts the stroke end to take up pad wear over time, maintaining consistent contact force without replacing the actuator.
Choose this 40 mm bore when you need around 628 N of push force at standard plant air pressure. If your load is lighter and space is tight, stepping down to a 32 mm bore (402 N push) saves weight; for heavier tooling, the 50 mm bore delivers 982 N. The 10 mm adjust range is ideal for fine end-stop calibration on a 300 mm stroke. For longer strokes, watch for side-loading on the 16 mm rod—an external guide rail or a guided cylinder may be required to prevent rod bending.
This SCJ replaces any AirTAC SCJ40X300-10S directly. When matching an existing unit, confirm the 40 mm bore, 300 mm nominal stroke, 10 mm adjustment range, PT1/4 thread, basic mount, and the magnetic piston option. If you do not need field adjustability, the fixed-stroke SC series offers a simpler, lower-cost alternative with the same mounting footprint.
Adjustable-stroke checklist
At 0.5 MPa, the theoretical push force is 628 N and the pull force is 528 N (reduced by the 16 mm rod area). At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. Always apply a safety factor for real-world dynamic loads.
A rear-cap screw sets the stroke end position within a 10 mm range, effectively shortening the 300 mm nominal stroke. Choose the SCJ when your application requires fine end-position tuning on the machine, such as during setup or format changes. If the stroke is fixed and never needs field adjustment, the standard SC series is a more economical choice.
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