This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X450-40, 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 SIJ125X450-40
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X450-40 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 450mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X450-40, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X450-40
- 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 SIJ125X450-40
The AirTAC SIJ125X450-40 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 410-450 mm extend window from the 450 mm nominal maximum. As a direct replacement, the SAIJ125X450-40 matches the interface, force, and mounting.
The SAIJ successor retains the exact ISO 15552 dimensions but incorporates an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. Note this SKU lacks a -S magnet, so it cannot accept legacy CS1-B/DS1-B sensors. The stop screw sets end position only; it is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-40 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X450-40 |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125X450-40 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 SAIJ125X450-40 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 SIJ125X450-40
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SIJ125X450-40 Is Used
Press Fit Tuning
Allows on-site extend stroke trimming by up to 40 mm to dial in exact press-fit depths for large 125 mm bore assembly operations without machining spacers.
Divert Stop Adjustment
Provides a field-adjustable end position for heavy product diverters, letting operators shift the stop point within the 410-450 mm window for varying pallet sizes.
Pallet Positioning
Offers adjustable end-stops for heavy load positioning fixtures where the exact extend point must be tuned on the factory floor to accommodate fixture wear.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-40 with the SAIJ125X450-40
To replace the discontinued SIJ125X450-40, order the direct replacement SAIJ125X450-40, which preserves the 450 mm stroke, 40 mm adjust window, G1/2 port, and FA/LB/TC mountings. Choose the 40 mm adjust window if your end-position tuning falls within 410-450 mm; for longer trims, select a larger adjust figure. Because the 450 mm stroke exceeds 300 mm, verify side-load limits and use external guides to prevent rod bending. This non-magnetic SKU cannot host a sensor; for load holding without live air, use an external rod lock or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X450-40
- ✓ 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 SIJ125X450-40 FAQ
Yes, the SIJ125X450-40 is discontinued. The direct replacement is the SAIJ125X450-40, which shares the identical ISO 15552 interface, 450 mm stroke, 40 mm adjust window, 125 mm bore, G1/2 port, and mounting options. The SAIJ family also features an upgraded piston seal for longer life.
The external stop screw provides a 40 mm adjust window, allowing the extend stroke to be shortened from the 450 mm nominal maximum down to 410 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X450-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X450-40 replacement — usually within 7-8 hours.