The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X75-30SH 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. Ø40mm bore, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X75-30SH is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering a 30 mm adjustment range via a rear-cap screw. This model delivers 628 N of push force at 0.5 MPa and is built with high-temperature Viton (FKM) seals, extending its operating range from 0 to +150 °C for demanding environments.
A built-in magnet allows direct mounting of CMSG/DMSG/EMSG sensors for precise end-of-stroke detection without additional brackets. The 40 mm bore features a 16 mm piston rod, PT1/4 ports, and a 21 mm air cushion, making it a robust solution for applications requiring fine-tuned positioning and hot-condition resilience.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X75-30SH |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 30 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. |
| ×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 Viton seals and 30 mm adjustment range allow operators to quickly reset the stroke end for different product sizes on heated packaging or sealing lines, withstanding ambient temperatures up to 150 °C.
Engineers can dial in the exact 75 mm maximum stroke during machine setup, using the rear screw to compensate for tooling tolerances and achieve perfect alignment before locking the setting.
With 628 N of push force and sensor-ready position feedback, this cylinder reliably actuates diverters near ovens or dryers, where the adjustable stroke helps take up wear on gate seals over time.
Choose this SCJ40 model when you need to fine-tune the stroke end position by up to 30 mm on the machine, avoiding the need for external hard stops. If more force is required, step up to the 50 mm bore SCJ50 series, which provides 982 N of push force at the same 0.5 MPa pressure. For applications demanding a fixed, non-adjustable stroke, the standard SC40 series is a more economical alternative.
This specific SCJ40X75-30SH is a direct replacement for any AirTAC SCJ adjustable cylinder with a 40 mm bore, 75 mm nominal stroke, 30 mm adjustment range, PT ports, a magnet, and Viton seals. For strokes of 300 mm or longer, consider an external guide rail to protect the 16 mm rod from side-load bending.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. The pull force is lower due to the area of the 16 mm piston rod. Maximum push force at 0.9 MPa is 1130 N.
Yes, if you need an adjustable stroke. The SCJ40X75-30SH mounts identically to an SC40 fixed-stroke cylinder but adds a rear adjusting screw. Ensure your replacement matches the 40 mm bore, PT1/4 ports, and that you need the 30 mm stroke-end adjustment range. The Viton seals are essential if your old cylinder operated above 70 °C.
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