Airtac SAIJ80 Adjustable Cylinder SAIJ80BX70-20S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80BX70-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 70mm stroke, G3/8 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ80 mm
- Stroke70 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80BX70-20S
The AirTAC SAIJ80X70-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 50 to 70 mm for precise end-position tuning. It delivers a robust 2513 N push force at 0.5 MPa, making it well-suited for heavier positioning tasks. The unit features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for CMSE and DMSE sensors.
This model utilizes PT tapered port threads and relies on variable air cushions at both ends to decelerate the load. The rear adjuster acts strictly as a mechanical stop to trim the stroke during commissioning; it does not lock or hold the load without live air pressure. For applications requiring position holding without continuous air, the SAIL or BSAI series is recommended.
Airtac SAIJ80 Adjustable Cylinder SAIJ80BX70-20S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80BX70-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 70 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ80 Adjustable Cylinder SAIJ80BX70-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×70 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ80 Adjustable Cylinder SAIJ80BX70-20S Is Used
Machine Setup Tuning
Dial in the exact 50-70 mm end-stop during initial commissioning to perfect a pressing operation without machining new spacer rings.
Product Changeover
Quickly trim the stroke back by up to 20 mm on a packaging line when switching to a slightly shorter product variant, minimizing downtime.
Heavy Duty Positioning
Leverage the 2513 N push force at 0.5 MPa to shift heavy jigs or clamps into a precise working zone before an external lock engages.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80BX70-20S the Right Cylinder?
Selecting this 80 mm bore over a 63 mm neighbor provides a significant thrust upgrade, jumping from 1559 N to 2513 N at 0.5 MPa, which is critical if your tooling requires extra power within a compact footprint. The 20 mm adjustment range is ideal when you need to dial in the exact end-stop on a machine without physically swapping cylinders or adding external stopper blocks. Because the nominal stroke is 70 mm, no external side-load guide is strictly required, but the 25 mm rod and M20x1.5 thread handle substantial side loads if they occur.
When matching this for an ISO 15552 replacement, verify the 80 mm bore, 70 mm stroke, 20 mm adjustment, PT port threads, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, intentionally omitting FB, CA, CB, and CR. Remember that the air cushion and mechanical stopper only decelerate and set travel limits, so a pilot-operated check valve is needed to hold loads safely without live air.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ80 Adjustable Cylinder SAIJ80BX70-20S FAQ
This 80 mm bore cylinder generates a push force of 2513 N and a pull force of 2268 N at 0.5 MPa. At the maximum operating pressure of 1.0 MPa, it provides up to 513 kgf of push force.
The rear adjuster screw acts as a mechanical stop that allows you to shorten the nominal 70 mm stroke by up to 20 mm, creating a usable travel window of 50 to 70 mm. It is a travel stop, not a lock, so it will not hold the load without live air pressure.
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