Airtac SCJ40 Standard Cylinder SCJ40X175-75S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X175-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø40mm bore, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke175 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X175-75S
The SCJ40X175-75S is a 40 mm bore double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, allowing the effective stroke to be shortened by up to 75 mm from the 175 mm nominal maximum via a rear-cap adjusting screw. This model includes a built-in magnet (suffix -S), enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel for precise end-of-stroke or mid-stroke position feedback without additional brackets.
At 0.5 MPa air pressure, it delivers 628 N of push force and 528 N on the pull stroke, with a 16 mm diameter piston rod and PT1/4 port connections. The cylinder body length A(SCJ) is 185 mm, and it features a 21 mm adjustable air cushion for smooth deceleration. Operating pressure ranges from 0.15 to 1.0 MPa, with a speed range of 30-800 mm/s, making it a versatile actuator for commissioning and format changeovers.
Airtac SCJ40 Standard Cylinder SCJ40X175-75S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X175-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 75 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 SCJ40X175-75S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×175 | Nominal (maximum) stroke length in mm. |
| -75 | 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 SCJ40X175-75S Is Used
Commissioning & Setup
The 75 mm adjustment range lets technicians dial in the exact stroke end-stop during initial machine setup without swapping cylinders or cutting rod extensions, saving hours of mechanical fitting time.
Multi-Format Packaging
On a packaging line running different box heights, the adjustable stroke allows a quick mechanical changeover for the pusher arm, eliminating the need for multiple fixed-stroke cylinders and reducing change parts inventory.
Wear Compensation
In clamping or pressing fixtures, the stroke can be incrementally advanced over the machine's life to compensate for wear on tooling or product contact surfaces, maintaining consistent clamp force without reprogramming.
Is the Airtac SCJ40 Standard Cylinder SCJ40X175-75S the Right Cylinder?
Choose the SCJ40 bore for applications needing up to 628 N of push force at standard plant air. If your load requires more, step up to the SCJ50 bore, which provides 982 N of push force at the same 0.5 MPa pressure. For a fixed, non-adjustable stroke, the standard SC series is a direct alternative, but you lose the ability to fine-tune the stroke end on the machine. The adjustable stroke is ideal for absorbing tolerance stack-ups during assembly or for machines that run multiple product sizes.
A genuine replacement must match the SCJ40 bore, 175 mm nominal stroke, and the full 75 mm adjustment range, with a PT port and the -S magnet option. For strokes of this length, ensure the rod is not subjected to high side loads; if lateral forces are present, couple the cylinder with an external linear guide or consider a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ 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 SCJ40X175-75S FAQ
At a standard 0.5 MPa (5 bar) air supply, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. The maximum push force at the 0.9 MPa operating limit is 1130 N.
A standard SC40 will fit the same mounting and port connections, but it has a fixed stroke. You would lose the 75 mm field-adjustable stroke feature. The correct direct replacement is an SCJ40X175-75S, which preserves the adjustable end-stop functionality and the built-in magnet for your sensors.
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