Airtac SCJ40 Standard Cylinder SCJ40X75-50S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X75-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø40mm bore, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke75 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X75-50S
The SCJ40X75-50S is a 40 mm bore double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, delivering 628 N of push force at 0.5 MPa. A rear-cap adjusting screw provides a 50 mm adjustment range, allowing the effective stroke to be tuned from 75 mm down to 25 mm without removing the cylinder—ideal for commissioning and fine-tuning end positions.
This model includes a built-in magnet (-S), enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors on the tie-rod barrel for reliable end-of-stroke detection. With a 16 mm diameter rod, PT1/4 ports, and a 21 mm air cushion, it operates smoothly across a 30-800 mm/s speed range on filtered air at 0.15-1.0 MPa.
Airtac SCJ40 Standard Cylinder SCJ40X75-50S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X75-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 50 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.
Theoretical Output Force (Ø40mm)
| 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.
Model Code: Airtac SCJ40 Standard Cylinder SCJ40X75-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
Where the Airtac SCJ40 Standard Cylinder SCJ40X75-50S Is Used
Commissioning & Setup
The 50 mm adjustment range lets technicians fine-tune the stroke end position on a new machine during initial setup without swapping cylinders or machining external stops.
Format Changeovers
Quickly adjust the push stroke for different product sizes on a packaging line. The rear screw makes format changes fast and repeatable without disassembling the actuator.
Wear Compensation
As gripper pads or tooling tips wear down over time, the stroke end can be incrementally extended via the adjusting screw to maintain consistent contact and part engagement.
Is the Airtac SCJ40 Standard Cylinder SCJ40X75-50S the Right Cylinder?
Choose the SCJ40X75-50S when you need to dial in a precise stroke end position within a 50 mm window. If your force requirement is lower, the 32 mm bore SCJ32 series provides 402 N of push force at 0.5 MPa; for significantly higher force, step up to the SCJ50 which delivers 982 N. This adjustable-stroke model is the right choice over a fixed-stroke SC when the application involves format changeovers or wear take-up that requires periodic stroke-end adjustment.
For direct replacement, match an AirTAC SCJ adjustable-stroke cylinder with a 40 mm bore, 75 mm nominal stroke, 50 mm adjustment range, PT ports, and a built-in magnet. If the rod is subject to side loads, consider adding an external linear guide or switching to a guided cylinder assembly to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ40 Standard Cylinder SCJ40X75-50S FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (due to the 16 mm rod reducing the piston area on the return stroke). The maximum push force at the 0.9 MPa operating limit is 1130 N.
Yes, if you need the adjustable stroke feature. The SCJ40X75-50S has the same 40 mm bore, 75 mm nominal stroke, and port size as an SC40X75, but includes a rear adjusting screw with a 50 mm range. Ensure the slightly longer body length A(SCJ) of 185 mm fits your mounting space.
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