Airtac SCJ40 Standard Cylinder SCJ40X40-30H
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X40-30H 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, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke40 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X40-30H
The SCJ40X40-30H is a 40 mm bore, double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. This allows machine builders to fine-tune the piston stop position during commissioning or changeovers without removing the cylinder. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, using a 16 mm diameter piston rod and PT1/4 ports.
This variant is built with Viton (FKM) seals, extending the operating temperature range from the standard -20 to +70°C up to 0 to +150°C, making it suitable for hot environments or applications with aggressive media. The body length A is 185 mm, and the cylinder features an adjustable air cushion for smooth end-of-stroke deceleration. The maximum standard stroke for this bore is 1200 mm, and the proof pressure is 1.5 MPa.
Airtac SCJ40 Standard Cylinder SCJ40X40-30H Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X40-30H |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 40 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 SCJ40X40-30H
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 SCJ40X40-30H Is Used
Commissioning & Setup
The 30 mm adjustable stroke lets technicians fine-tune the end position on a new machine without fabricating shims or custom stops, speeding up factory acceptance testing.
Product Changeover
On a packaging line, the stroke can be quickly adjusted to accommodate different box heights or product sizes, minimizing downtime between batches.
Clamp Wear Compensation
In a high-cycle welding or assembly fixture, the adjusting screw can be advanced to compensate for wear on the clamp pads, maintaining consistent clamping force over time.
Is the Airtac SCJ40 Standard Cylinder SCJ40X40-30H the Right Cylinder?
Choose the SCJ40 when you need to dial in a precise stroke end position within a 30 mm window, a common requirement for format changeovers on packaging lines or wear take-up on clamping fixtures. If the 628 N push force at 0.5 MPa is insufficient, stepping up to the 50 mm bore (SCJ50) provides 982 N of push force. For applications that do not require stroke adjustability, the fixed-stroke SC40 series offers a simpler, more cost-effective solution.
This model is a direct replacement for an existing AirTAC SCJ40X40-30H with PT ports, basic mounting, and Viton seals. For a guided, rigid assembly that prevents rod rotation, consider pairing this cylinder with an external guide or selecting a dedicated guided cylinder series.
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 SCJ40X40-30H FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. The theoretical force at 1.0 MPa is 128 kgf.
Yes, if you need the added stroke adjustability. The SCJ40X40-30H has the same bore, rod diameter, and port size as an SC40, but the body is slightly longer to accommodate the adjusting screw. Ensure the 30 mm adjustment range does not interfere with your machine's existing tooling.
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