Airtac SCJ40 Standard Cylinder SCJ40X450-40
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X450-40 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, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke450 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X450-40
The SCJ40X450-40 is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a 450 mm nominal stroke, featuring a rear adjusting screw that provides up to 40 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. The 16 mm diameter piston rod and PT1/4 port supply a push force of 628 N at 0.5 MPa, scaling to 1130 N at the maximum operating pressure of 0.9 MPa.
Built on the rugged AirTAC SC tie-rod platform, the SCJ40X450-40 body length A is 185 mm plus the 450 mm stroke, making it slightly longer than a fixed-stroke SC of the same dimensions. The adjustable screw only sets the stroke end; it does not alter the cylinder's force output or speed. Standard TPU seals and PT threads are fitted, and the 21 mm air cushion at each end decelerates the piston smoothly. For position sensing, a magnet-equipped variant (-S suffix) can be ordered to accept CMSG/DMSG sensors.
Airtac SCJ40 Standard Cylinder SCJ40X450-40 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X450-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 450 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 SCJ40X450-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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 SCJ40X450-40 Is Used
Commissioning & Setup
Engineers can fine-tune the end-stop position on a 450 mm stroke actuator during initial machine bring-up, compensating for stack-up tolerances in welded frames or fabricated brackets without re-machining parts.
Product Format Changeover
On a packaging line, the 40 mm adjust range lets operators quickly shift a pusher's end position to handle different box sizes, eliminating the need for mechanical hard stops or cylinder swaps between batches.
Wear Compensation
In high-cycle clamping or pressing fixtures, the stroke-end screw can be advanced over time to take up wear on tooling or gripper pads, maintaining consistent clamp force without replacing the entire cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X450-40 the Right Cylinder?
Choose the SCJ40X450-40 when you need to dial in a precise end-of-stroke position within a 40 mm window on a 450 mm nominal stroke. If your force requirement grows, stepping up to the 50 mm bore SCJ50 provides 982 N of push at 0.5 MPa. For applications where the stroke is fixed and never needs adjustment, the standard SC40X450 is a simpler, cost-effective alternative. This SCJ model is a direct replacement for another AirTAC SCJ40X450-40 with PT ports and basic mounting.
At a 450 mm stroke, the extended rod is susceptible to side loading and bending. Ensure the load is guided externally with a linear rail or rod guide, or consider a guided cylinder if lateral forces are present. The cylinder mounts via the basic body threads or with optional FA front flange or LB foot brackets from the SCJ accessory subset.
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 SCJ40X450-40 FAQ
At the standard 0.5 MPa operating pressure, the push force is 628 N. This increases to 879 N at 0.7 MPa and reaches a maximum of 1130 N at the 0.9 MPa upper limit. The pull force is lower at 528 N (0.5 MPa) due to the 16 mm rod reducing the piston area on the retract side.
Yes, the SCJ40X450-40 is dimensionally compatible with the SC40X450 body and mounting points, but it adds a rear adjusting screw. If you need the adjustable stroke feature, it is a direct swap. Ensure the port thread (PT) matches your existing fittings. If you do not need the adjustability, the standard SC40X450 is a more economical choice.
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