This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X70H, 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 SI50 Standard Cylinder SI50X70H
The AirTAC Airtac SI50 Standard Cylinder SI50X70H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 70mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X70H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke70 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X70H
- 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 SI50 Standard Cylinder SI50X70H
The AirTAC SI50X70H is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 70 mm stroke, delivering 982 N push force at 0.5 MPa. This high-temperature variant uses Viton H seals for 0 to 150 C environments. It features a G1/4 port and M16x1.5 rod thread. Note this SKU lacks a magnet, so it cannot accept position sensors.
The direct replacement is the SAI50X70H, retaining identical ISO 15552 mounting dimensions, output force, and port size. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. For load-holding needs the SI lacked, explore the SAIL or BSAI lock variants.
Airtac SI50 Standard Cylinder SI50X70H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X70H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X70H |
| Bore size | Ø50 mm |
| Stroke | 70 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X70H carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50X70H produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X70H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×70 | 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 SI50 Standard Cylinder SI50X70H Is Used
Hot Stamp Ejection
Uses the 982 N push force and Viton H seals to eject parts from 150 C stamping dies safely.
High-Temp Diverting
Actuates diverter arms on heat-treat lines, where standard NBR seals would degrade.
Packaging Press
Provides a compact 70 mm stroke for sealing and pressing operations in automated wrappers.
Replacing the Airtac SI50 Standard Cylinder SI50X70H with the SAI50X70H
To replace the SI50X70H, order the SAI50X70H to guarantee the same ISO 15552 interface, 50 mm bore, 70 mm stroke, G1/4 port, and Viton H high-temperature seals. Because this specific SKU has no magnet (-S), it cannot support legacy CS1-B/DS1-B sensors; if sensing is required, specify a magnet on the new SAI order. Sizing both ways: the 50 mm bore yields 982 N push at 0.5 MPa, while the neighbouring 40 mm bore offers 628 N. Remember a standard cylinder drifts without live air—the cushion only decelerates—so for suspended loads use an external pilot check valve or the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X70H
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X70H FAQ
Yes, the SI50X70H is discontinued. The direct replacement is the SAI50X70H. It is dimensionally interchangeable per ISO 15552, matching the 50 mm bore, 70 mm stroke, G1/4 port, and mounting fixtures, but features an upgraded piston seal.
The 50 mm bore uses a G1/4 air port. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. The rod is 20 mm with an M16x1.5 thread.
Request a Quote for the SAI50X70H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X70H replacement — usually within 7-8 hours.