Airtac SCJ40 Standard Cylinder SCJ40X450-50S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X450-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 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-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X450-50S
The SCJ40X450-50S is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a nominal 450 mm stroke, featuring a rear-cap adjusting screw that provides a 50 mm field-adjustable range for the stroke end. This allows fine-tuning of the piston stop position without removing the cylinder, ideal for commissioning and format changeovers. 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.
This model includes a built-in magnet (-S suffix) for direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel, enabling precise end-of-stroke or mid-stroke position feedback. The body length A is 185 mm, and the air cushion length is 21 mm. Operating pressure ranges from 0.15 to 1.0 MPa, with a maximum push force of 1130 N at 0.9 MPa.
Airtac SCJ40 Standard Cylinder SCJ40X450-50S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X450-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 50 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 SCJ40X450-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×450 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ40X450-50S Is Used
Commissioning & Setup
The 50 mm adjust range allows engineers to precisely dial in the actuator stop point during initial machine setup, compensating for stack-up tolerances without needing to shim or modify mounting brackets.
Format Changeovers
On packaging or sorting lines, the adjustable stroke lets operators quickly change the pusher or stopper position for different product sizes, minimizing downtime between production runs.
Wear Compensation
In high-cycle clamping or pressing fixtures, the stroke can be gradually extended over time to compensate for pad or tooling wear, maintaining consistent contact force without replacing the cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X450-50S the Right Cylinder?
Choose the SCJ40X450-50S when you need a mid-range force of 628 N push at 0.5 MPa and the ability to dial in the stroke end by up to 50 mm on the machine. If your application requires more force, step up to the 50 mm bore SCJ series, which provides 982 N push at the same pressure. For applications where the stroke is fixed and never needs adjustment, the standard SC40X450 fixed-stroke cylinder is a simpler, more cost-effective alternative. This cylinder is a direct replacement for another AirTAC SCJ40 adjustable-stroke unit with the same 450 mm nominal stroke, 50 mm adjust range, PT ports, and magnet. For the 450 mm stroke length, ensure the rod is properly guided or supported externally if significant side loads are present to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ40X450-50S FAQ
At the standard 0.5 MPa operating pressure, the cylinder provides 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. The pull force is lower due to the area of the 16 mm piston rod.
It can physically mount in the same space, but the SCJ body is slightly longer to house the adjusting screw. It is a direct functional replacement only if you need the adjustable stroke feature. For a simple fixed-stroke replacement, the standard SC40X450 is the correct match.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SCJ Adjustable-Stroke Cylinders
Request a Quote for Airtac SCJ40 Standard Cylinder SCJ40X450-50S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.