This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X87, 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 SI40 Standard Cylinder SI40X87
The AirTAC Airtac SI40 Standard Cylinder SI40X87 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 87mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X87, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke87 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X87
- 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 SI40 Standard Cylinder SI40X87
The AirTAC SI40X87 is a discontinued double-acting ISO 15552 profile cylinder with an 87 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40X87, which shares the exact bore, stroke, force, port and mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet (-S) and cannot take a CS1-B/DS1-B sensor.
Airtac SI40 Standard Cylinder SI40X87 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X87 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X87 |
| Bore size | Ø40 mm |
| Stroke | 87 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40X87 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
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 | |
The SAI40X87 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40X87
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×87 | 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 SI40 Standard Cylinder SI40X87 Is Used
Clamp Actuation
Provides 628 N of push force at 0.5 MPa, ideal for securing mid-weight workpieces during machining operations.
Package Diversion
Drives 87 mm stroke diverters to route boxes on production lines, operating efficiently at 30-800 mm/s.
Replacing the Airtac SI40 Standard Cylinder SI40X87 with the SAI40X87
To replace this SI40X87, order the SAI40X87. Confirm the ISO 15552 mounting interface, 40 mm bore, 87 mm stroke, G1/4 port (PT/G/NPT) and your mounting accessory. Because this specific SKU has no magnet, it cannot accept a sensor. If you need to hold a load on air loss, a plain cylinder drifts; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. To size both ways: a neighbouring 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. For strokes over 300 mm, add a guide to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X87
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40X87 FAQ
Yes, the SI40X87 is discontinued. The direct replacement is the SAI40X87. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 87 mm stroke, 628 N force, G1/4 port and mounting interface.
This double-acting cylinder has a 16 mm rod, M12x1.25 thread, 27 mm cushion and G1/4 port. Force ratings are: 628 N push / 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Request a Quote for the SAI40X87
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X87 replacement — usually within 7-8 hours.