This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X50-40S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-40S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X50-40S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 50mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X50-40S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X50-40S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-40S
The AirTAC SIJ125X50-40S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 40 mm on-site, yielding a usable 10-50 mm extend window from the 50 mm nominal maximum. The direct replacement is the SAIJ125X50-40S.
The SAIJ successor shares the identical ISO 15552 mounting interface, force, and adjust window, but upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. Remember the stop screw sets end position; it is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-40S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X50-40S |
| Bore size | Ø125 mm |
| Stroke | 50 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ125X50-40S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAIJ125X50-40S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-40S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-40S Is Used
Press Fit Tuning
Allows operators to fine-tune the extend stroke by up to 40 mm on-site to dial in exact press-fit depths for large bearings without swapping cylinders.
Divert Stop Adjustment
Provides a variable end position for diverter arms on heavy-duty conveyors, letting maintenance crews shorten the extend stroke by up to 40 mm to accommodate new package sizes.
Pallet Positioning
Offers adjustable end-of-stroke positioning for pallet stops, enabling quick 10-50 mm extend stroke tweaks on the factory floor to align varying pallet widths.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-40S with the SAIJ125X50-40S
To replace the discontinued SIJ125X50-40S, order the exact direct replacement SAIJ125X50-40S to retain the 50 mm nominal stroke, 40 mm adjust window, G1/2 port, and ISO 15552 mounting. Choose the 40 mm adjust window if your field tuning requires trimming the extend stroke by up to 40 mm on-site. Mounting options include Basic, FA, LB, and TC. The -S suffix provides a piston magnet for position sensing. For stroke lengths >=300 mm, verify side-load tolerance to prevent rod binding. The stop screw sets end position and does not hold loads on air loss; for held loads use SAIL/BSAI or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X50-40S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-40S FAQ
Yes, the SIJ125X50-40S is discontinued. The direct replacement is the SAIJ125X50-40S. It shares the same ISO 15552 interface, 125 mm bore, 50 mm stroke, 40 mm adjust window, G1/2 port, and mounting options, but features an upgraded piston seal.
This double-acting double-rod cylinder has a 125 mm bore with a 32 mm rod. The external stop screw provides a 40 mm adjust window, allowing you to trim the extend stroke from the 50 mm nominal maximum down to 10 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X50-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X50-40S replacement — usually within 7-8 hours.