Airtac SCJ40 Standard Cylinder SCJ40X75-40S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X75-40S 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. Ø40mm bore, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke75 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X75-40S
The SCJ40X75-40S brings field-adjustable stroke control to a 40 mm bore platform, delivering a push force of 628 N at 0.5 MPa. Its rear-cap adjusting screw provides up to 40 mm of stroke-end reduction, allowing machine builders to fine-tune the end position without swapping the cylinder or adding external hard stops. The 16 mm diameter piston rod and PT1/4 porting keep it compatible with standard pneumatic circuits.
This model includes a built-in magnet, so CMSG, DMSG, or EMSG sensors can be clamped directly onto the tie-rod barrel for non-contact position sensing. The adjustable air cushion decelerates the piston smoothly at both ends, and the body length A(SCJ) is 185 mm, making it a compact solution for applications where the stroke needs to be dialled in precisely during commissioning or changeover.
Airtac SCJ40 Standard Cylinder SCJ40X75-40S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X75-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 40 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 SCJ40X75-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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.
Where the Airtac SCJ40 Standard Cylinder SCJ40X75-40S Is Used
Commissioning & Setup
Engineers can dial in the exact stroke end position during machine commissioning, compensating for assembly tolerances without re-machining mounting brackets.
Format Changeover
On packaging lines, the 40 mm adjust range lets operators quickly reset a pusher or diverter stroke for a new box size, reducing downtime between production runs.
Wear Compensation
In clamping or pressing fixtures, the screw can be advanced over time to take up wear on tooling, maintaining consistent contact force without replacing the actuator.
Is the Airtac SCJ40 Standard Cylinder SCJ40X75-40S the Right Cylinder?
Step up to the SCJ50 series when you need more force—the 50 mm bore delivers 982 N of push at 0.5 MPa. If your application doesn't require stroke adjustability, the fixed-stroke SC40 cylinder is a simpler, more cost-effective alternative. For a direct replacement, match the 40 mm bore, 75 mm nominal stroke, 40 mm adjust range, PT thread, and the -S magnet option; mounting is basic, so no bracket is included.
At a 75 mm stroke, rod bending is not a primary concern, but always align the load axially to prevent side-load wear on the rod bearing and piston seal.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ40X75-40S FAQ
At 0.5 MPa, this double-acting single-rod cylinder produces 628 N pushing and 528 N pulling. The push force is higher because pressure acts on the full bore area, while the pull force subtracts the 16 mm rod area.
A screw in the rear cap limits how far the piston can retract, shortening the stroke end by up to 40 mm. The 75 mm nominal stroke is the maximum; you set the effective stroke anywhere within that 40 mm reduction range. It does not adjust speed or force.
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