This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X185-50S, 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 SIJ125X185-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X185-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 185mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X185-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X185-50S
- 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 SIJ125X185-50S
The AirTAC SIJ125X185-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 185 mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, yielding a usable 135-185 mm forward travel. The direct replacement is the SAIJ125X185-50S, matching the interface, force, and mounting.
The SAIJ upgrade features a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches. Note the stop screw sets end position only; it is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X185-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X185-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X185-50S |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125X185-50S 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 SAIJ125X185-50S 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 SIJ125X185-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SIJ125X185-50S Is Used
Press Fit Tuning
Allows operators to fine-tune the 135-185 mm extend stroke on-site to dial in exact press fits without swapping cylinders.
Variable Carton Sealing
Accommodates fluctuating package heights by shortening the forward stroke up to 50 mm, ensuring consistent sealing pressure.
Adjustable End Stops
Replaces fixed external stops on heavy machinery by using the integrated screw to set precise 125 mm bore end positions.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X185-50S with the SAIJ125X185-50S
To replace the discontinued SIJ125X185-50S, order the direct replacement SAIJ125X185-50S, retaining your existing FA, LB, or TC ISO 15552 mounts. Choose the 50 mm adjust window if you need to trim the 185 mm extend stroke down to 135 mm on-site; this mechanism sets the end position but does not lock the load. The -S magnet enables position sensing. For stroke lengths of 300 mm or more, verify side-load limits to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X185-50S
- ✓ 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 SIJ125X185-50S FAQ
Yes, the SIJ125X185-50S is discontinued. The direct replacement is the SAIJ125X185-50S, which shares the same ISO 15552 interface, 125 mm bore, 185 mm stroke, 50 mm adjust window, G1/2 port, and mounting options. The SAIJ family also adds upgraded piston seals and lock variants like SAIL and BSAI.
Push forces are 8590 N at 0.7 MPa and 11045 N at 0.9 MPa, with a theoretical max of 1251 kgf at 1.0 MPa. The 50 mm adjust window allows trimming the 185 mm extend stroke down to 135 mm. The stop screw sets end position only and does not hold loads on air loss.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X185-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X185-50S replacement — usually within 7-8 hours.