Airtac SCJ40 Standard Cylinder SCJ40X225-30
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X225-30 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, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke225 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X225-30
The SCJ40X225-30 is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a 225 mm nominal stroke, featuring a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. This allows fine-tuning of the piston stop position without replacing the cylinder, ideal for commissioning and format changes. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, with a 16 mm diameter piston rod and PT1/4 ports.
The cylinder body has a length of 185 mm (A dimension) and includes an adjustable air cushion for smooth deceleration. Its operating pressure range is 0.15-1.0 MPa, with a proof pressure of 1.5 MPa, and it is rated for speeds of 30-800 mm/s. This model uses the standard TPU seal and PT thread configuration.
Airtac SCJ40 Standard Cylinder SCJ40X225-30 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X225-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 225 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.
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 SCJ40X225-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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.
Where the Airtac SCJ40 Standard Cylinder SCJ40X225-30 Is Used
Commissioning Trials
Fine-tune the end-stop position during machine setup by adjusting the rear screw up to 30 mm, eliminating the need to swap cylinders for small stroke changes.
Format Changeover
Quickly adapt to different product sizes on a packaging line by adjusting the stroke end without mechanical disassembly, reducing downtime between batches.
Wear Compensation
Take up mechanical play or tooling wear over time by slightly extending the effective stroke via the rear adjuster, maintaining consistent process quality.
Is the Airtac SCJ40 Standard Cylinder SCJ40X225-30 the Right Cylinder?
This 40 mm bore model suits applications needing up to 628 N of push force at 0.5 MPa. If higher force is required, stepping up to the 50 mm bore provides 982 N at the same pressure, while the 32 mm bore offers a more compact option at 402 N. For applications where the stroke length is fixed and never needs adjustment, the standard SC series fixed-stroke cylinder is a simpler alternative.
A direct replacement must match the 40 mm bore, 225 mm nominal stroke, and 30 mm adjustment range, with PT port threads. This SCJ cylinder accepts the FA front flange or LB foot mount from the SCJ accessory subset, but does not support FB or CA/CB mounts. For strokes over 300 mm, consider an external guide to prevent rod bending under side loads.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ40X225-30 FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N due to the 16 mm rod. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N.
A rear-cap screw allows you to shorten the stroke end by up to 30 mm from the nominal 225 mm. It sets the piston stop position mechanically and does not adjust speed or force.
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