
The AirTAC Airtac B01-MACJ Special Cylinder B01-MACJ25X175-20S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø0mm bore and 175mm stroke, PT/G air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service. A variable air cushion at both ends lets you tune end-of-stroke deceleration on site.
Two models share a 175 mm stroke; this one, the MACJ25X175-20S, carries a 20 mm adjust window, giving a working range of 155-175 mm on the extend side. Like every MACJ it is double-acting with a variable air cushion at both ends, drawing 245.3 N of push and 206.1 N of pull at 0.5 MPa (35.6 psi) from its 25 mm bore. At 0.7 MPa the push climbs to 343.4 N.
AirTAC builds the MA body by rolling the aluminium covers and a stainless block onto the barrel, so there are no tie rods to work loose under vibration. The built-in magnet is part of the standard spec, dropping CMSG / DMSG / EMSG switches straight on. For sizing, treat about 147 N as the dependable force at 0.5 MPa - that supports a vertical lift near 12 kg with a 2:1 cushion for part weight.
| Model | Airtac B01-MACJ Special Cylinder B01-MACJ25X175-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø0 mm |
| Stroke | 175 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | PT/G |
| Rod thread |
| 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 | Variable air cushion, both ends |
| Max standard stroke | Up to 300 mm |
Specifications follow the official AirTAC MA-series datasheet. Barrel: stainless-steel tube (round-body, riveted rolling-packed construction); piston rod: carbon steel with 20µm hard-chrome plating; covers: aluminium alloy. Thread options: PT (blank) / G / NPT. Every MA-series cylinder ships with a built-in magnet for CMSG / DMSG / EMSG position sensors.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 0 N | 0 N |
| 0.7 MPa | 0 N | 0 N |
| Max (@1.0 MPa) | 0 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 0 | Bore size in mm. |
| ×175 | Stroke length in mm. |
| -20 | Adjustable stroke window (mm the extend stroke can be shortened on site). |
| -S | Built-in magnet for CMSG / DMSG / EMSG sensors (standard on MA series). |
| CA / U / CM | Back-cover type: CA pivot, U flat-end, CM round-end. |
MA-family variants: MA / MAC (double acting ±cushion), MSA / MTA (single acting push / pull), MAD / MACD (double rod ±cushion), MAJ / MACJ (adjustable stroke ±cushion), MAR (cushioned with integrated F/U mount). Mounting accessories: FA flange, LB foot, SDB pivot; plus I and Y knuckles. Thread PT (blank) / G / NPT.
Gate cylinder on an automotive dashboard bin conveyor: 155-175 mm of settable travel matches bin widths across two model variants.
Reject pusher on a bottling line: at 0.7 MPa the 343.4 N push clears a fallen bottle from the lane without stopping the conveyor.
Index stop on a rotary cap feeder table: the built-in magnet and a CMSG switch confirm the stop is home before the table turns.
Sizing check: against this model's 245.3 N push at 0.5 MPa, the 20 mm MACJ offers 157.0 N and the 32 mm step offers 402.2 N - pick the smaller if force is idle, the larger if duty cycles are heavy. Bear in mind the trim screw holds position only while air holds the piston; it is not a load-holding device. FA flange and LB foot mounts, plus I / Y knuckles, suit most fixtures, and every unit ships with the magnet for CMSG / DMSG / EMSG switches. At 175 mm of stroke, route side loads into a guide - do not cantilever them on the rod.
Quick checklist
Push 245.3 N and pull 206.1 N at 0.5 MPa; push 343.4 N at 0.7 MPa; theoretical maximum 50 kgf for the 25 mm bore. Air supply 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), rod speed 30-800 mm/s, extend stroke trimmable 155-175 mm.
FA flange and LB foot are the standard mounts, with I and Y rod knuckles available for pivot loads; the adjustable-stroke version has no SDB or back-cover code, so plan the fixture around flange or foot.
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