Specifications: MG20X150S — AirTAC MG stainless steel mini cylinder, double acting, single rod, 20 mm bore and 150 mm stroke. PT1/8 port; magnetic piston.
Product Catalog
Download Airtac Product Catalog (PDF)
Download AirTAC 2022 Sensor and Mounting Compatibility Guide (PDF)
Download 2022 mounting brackets (PDF)
Download 2022 cylinder installation and weight tables (PDF)
For detailed product dimensions and mounting drawings, please download and refer to the PDF catalog.
Model Code Explained
| Code |
Meaning |
| MG |
stainless steel mini cylinder; double acting, single rod |
| 20 |
Cylinder bore: 20 mm |
| X150 |
Stroke: 150 mm |
| S |
Magnetic piston |
| No thread suffix |
PT pipe thread (catalog default) |
Technical Specifications
| Parameter |
Details |
| Model |
MG20X150S |
| Product type |
stainless steel mini cylinder |
| Operation |
double acting, single rod |
| Bore |
20 mm |
| Stroke |
150 mm |
| Piston-rod diameter |
8 mm |
| Rod-end thread |
M8 × 1.25 |
| Working medium |
Air filtered to 40 µm or finer |
| Operating pressure |
0.15–1.0 MPa |
| Proof pressure |
1.5 MPa |
| Operating temperature |
−20 to +70 °C |
| Piston speed |
30–800 mm/s |
| Port |
PT1/8 |
| Cushioning |
Bumper |
| Magnetic piston |
Included (S) |
| Stroke tolerance |
+1.0 / 0 mm up to 150 mm; +1.5 / 0 mm above 150 mm |
Features and Operation
- Alternating the supply and exhaust at the two cylinder ports drives extension and retraction.
- The tube and end-cover construction is not intended for dismantling. Protect the rod and sliding surfaces, and keep the load aligned with the cylinder axis.
External and Mounting Dimensions
The following symbols refer to the MG drawing for 20 mm bore, 150 mm stroke in the 2022 cylinder catalog, printed page 100. Values are in mm unless a thread or formula is stated. The symbols retain the drawing references and must not be rearranged into an unsupported length × width × height.
| Parameter |
Details |
| A — base length before the stroke term |
106 mm |
| AB |
35 mm |
| AC |
69 mm |
| B — body dimension in the drawing |
24 mm |
| R — outside-body dimension in the drawing |
26.5 mm |
| K — mounting-hole/thread detail |
M4 × 0.7, depth 7 |
| KB |
14 mm |
| EA |
16.5 mm |
| Overall length from the printed formula |
256 mm |
| Drawing length relation |
A + stroke |
For detailed product dimensions and mounting drawings, please download and refer to the PDF catalog.
Compatible Accessories and Sensors
| Accessory code |
Purpose and compatibility |
| F-MG20LB |
F-MG20LB: foot bracket for MG series, 20 mm bore. Optional; not implied by this model code. |
| F-MG20FA |
F-MG20FA: front flange for MG series, 20 mm bore. Optional; not implied by this model code. |
| F-MG20SDB |
F-MG20SDB: rear pivot bracket for MG series, 20 mm bore. Optional; not implied by this model code. The bracket is supplied with its matching pin. Requires the matching CB rear clevis; SDB alone is not the complete pivot connection. |
| F-MG20CB |
F-MG20CB: rear clevis for MG series, 20 mm bore. Optional; not implied by this model code. |
| F-ACQ20I |
F-ACQ20I: rod-end eye joint for MG series, 20 mm bore. Optional; not implied by this model code. |
| F-ACQ20Y |
F-ACQ20Y: rod-end fork joint for MG series, 20 mm bore. Optional; not implied by this model code. |
For this magnetic MG cylinder with 20 mm bore, the 2022 sensor selection table lists CMSG and DMSG with the round-cylinder mounting band F-MQS20. The band matches the stainless steel cylinder body; do not substitute a tie-rod bracket or a different bore size. Sensors and bands are selected separately and are not implied by the S piston-magnet code.
Fit the sensor into the band holder, wrap and fasten the band around the cylinder, move it to the required detection position, then tighten the sensor and band fasteners. Select the complete sensor order code to match the required supply voltage, output circuit, wiring and cable length; CMSG/DMSG here identify compatible sensor profiles.
Optional magnetic sensor order codes
-
CMSG — standard/A05 reed sensors
Two-wire reed operation at 5–240 V AC/DC.
CMSG-020, CMSG-030, CMSG-050, CMSG-100, CMSG-M08, CMSG-M08010, CMSG-M08020, CMSG-M08030, CMSG-M12, CMSG-M12010, CMSG-M12020, CMSG-M12030, A05-CMSG-020, A05-CMSG-030, A05-CMSG-050, A05-CMSG-100
-
CMSG-H — high-temperature reed sensors
Two-wire reed operation at 5–240 V AC/DC.
CMSG-020-H, CMSG-030-H, CMSG-050-H, CMSG-100-H, CMSG-M08-H, CMSG-M08010-H, CMSG-M08020-H, CMSG-M08030-H, CMSG-M12-H, CMSG-M12010-H, CMSG-M12020-H, CMSG-M12030-H
-
DMSG — two-wire electronic sensors
Two-wire electronic operation at 10–28 V DC.
DMSG-020, DMSG-030, DMSG-050, DMSG-100, DMSG-M08, DMSG-M08010, DMSG-M08020, DMSG-M08030, DMSG-M12, DMSG-M12010, DMSG-M12020, DMSG-M12030, DMSG-020-W, DMSG-030-W, DMSG-050-W, DMSG-100-W, A05-DMSG-020, A05-DMSG-030, A05-DMSG-050, A05-DMSG-100, A06-DMSG-020, A06-DMSG-030, A06-DMSG-050, A06-DMSG-100
-
DMSG — NPN electronic sensors
NPN three-wire output with a 5–30 V DC supply.
DMSG-N020, DMSG-N030, DMSG-N050, DMSG-N100, DMSG-NM08, DMSG-NM08010, DMSG-NM08020, DMSG-NM08030, DMSG-NM12, DMSG-NM12010, DMSG-NM12020, DMSG-NM12030, DMSG-N020-W, DMSG-N030-W, DMSG-N050-W, DMSG-N100-W
-
DMSG — PNP electronic sensors
PNP three-wire output with a 5–30 V DC supply.
DMSG-P020, DMSG-P030, DMSG-P050, DMSG-P100, DMSG-PM08, DMSG-PM08010, DMSG-PM08020, DMSG-PM08030, DMSG-PM12, DMSG-PM12010, DMSG-PM12020, DMSG-PM12030, DMSG-P020-W, DMSG-P030-W, DMSG-P050-W, DMSG-P100-W
-
EMSG — miniature two-wire sensors
A smaller G-profile sensor for magnetic MG, with two-wire operation at 10–28 V DC.
EMSG-020, EMSG-030, EMSG-050, EMSG-100, EMSG-M08, EMSG-M08010, EMSG-M08020, EMSG-M08030, EMSG-M12, EMSG-M12010, EMSG-M12020, EMSG-M12030, EMSG-020-W, EMSG-030-W, EMSG-050-W, EMSG-100-W, EMSG-M08-W, EMSG-M08010-W, EMSG-M08020-W, EMSG-M08030-W, EMSG-M12-W, EMSG-M12010-W, EMSG-M12020-W, EMSG-M12030-W, A05-EMSG-020, A05-EMSG-030, A05-EMSG-050, A05-EMSG-100, A06-EMSG-020, A06-EMSG-030, A06-EMSG-050, A06-EMSG-100
-
Two-wire mating cables (B)
For a matching M8 or M12 two-wire male sensor; ordered separately.
F-ECM08B020, F-ECM08B030, F-ECM08B050, F-ECM08B100, F-ECM12B020, F-ECM12B030, F-ECM12B050, F-ECM12B100
-
Three-wire mating cables (C)
For a matching M8 or M12 NPN/PNP male sensor; ordered separately.
F-ECM08C020, F-ECM08C030, F-ECM08C050, F-ECM08C100, F-ECM12C020, F-ECM12C030, F-ECM12C050, F-ECM12C100
For CMSG reed options, maximum limits are 100 mA, 10 W and 200 Hz, with no internal consumption or leakage. Standard/A05 versions have a maximum 2.5 V drop at 100 mA DC. H versions have no residual voltage or indicator LED.
Two-wire DMSG/EMSG operate at 2.5–100 mA, up to 2.8 W and 1,000 Hz. Maximum consumption is 3 mA, residual voltage 3.5 V and leakage current 0.06 mA.
NPN/PNP DMSG outputs are rated to 30 V / 200 mA, 6 W and 1,000 Hz. Maximum consumption is 5 mA, residual voltage 0.7 V and leakage current 0.01 mA.
Sensor direct-lead endings 020/030/050/100 mean 2/3/5/10 m. M08/M12 mean M8/M12 male connectors with 0.5 m leads; M08010/M08020/M08030 and M12010/M12020/M12030 have 1/2/3 m leads. Female-cable endings 020/030/050/100 mean 2/3/5/10 m. Lead length is independent of cylinder stroke.
Match the female cable to the male connector size and wire count; direct-lead sensors need no mating cable. B pinout is 1 brown (+), 4 blue (−), 3 unused; C is 1 brown (+), 3 blue (−), 4 black output. Verify the cable’s electrical, temperature and environmental ratings.
A05 is flex-resistant robotics cable; A06 is oil-resistant flex cable. Both have a recommended minimum bend radius of 19 mm and use direct leads only, without NPN/PNP, M8/M12 or W options; A05-CMSG also excludes H. W denotes waterproof: DMSG-W is direct-lead only; listed EMSG-W also offers connectors. Check connector sealing separately.
Ordinary, W, A05 and A06 sensors operate at −10 to +70°C; CMSG-H at −10 to +125°C. The cylinder remains limited to +70°C: use the common operating range. Ordinary/H/A05 are IP64; W/A06 are IP68. These are sensor ratings, not cylinder, connector or assembly ratings.
Observe both current and load-capacity limits; controller inputs must tolerate the residual voltage and leakage. Reed, two-wire electronic, NPN and PNP circuits are not interchangeable. CMS has no protection circuit; DMS/EMS include reverse-polarity and surge protection. Insulate and complete wiring before energizing; separate it from power/high-voltage wiring.
Tighten sensor screws to 0.15–0.20 N·m, never above 0.25 N·m; band and cylinder fasteners need their own specifications. Set detection at the actuation-range centre. Avoid impact, cable tension and flexing caused by motion; inspect fixings, cables and indication periodically.
Keep non-waterproof sensors dry; avoid prolonged immersion even with waterproof types. Verify oil/chemical compatibility. Avoid explosive atmospheres, aggressive chemicals, rapid temperature changes, welding interference and magnetic debris. Protect industry cables against unsuitable heat, dust, water and oil, and shield oil-resistant versions from weld spatter.
Optional cylinder-port connections
If you use the 6 mm OD tubing in the circuit reference in this description, choose a straight connection or a speed controller at each cylinder port as needed. The two listed parts are alternatives at the same connection point, not a pair to install together. Keep the two cylinder chamber lines separate.
-
PC601: PT1/8 male × 6 mm tube OD
Straight cylinder-to-tube connection; no speed adjustment
-
PTL601A: PT1/8 male × 6 mm tube OD; A-type flow direction
Cylinder-port meter-out speed control, replacing the straight fitting at that port
The A-type controller meters air leaving the cylinder through its threaded end to the tube and allows free flow in the reverse direction. Its recommended 0.08 N·m cap-rotation torque is not the torque for screwing it into the cylinder.
Seal the PT tapered thread correctly. These standard gray fittings accept soft nylon or polyurethane tubing and are rated for 0–1 MPa and −20 to +70°C. Stay within the working limits of the cylinder, tubing and every connected part. Check tube insertion and wrench clearance, and order the selected accessories separately.
Weight Reference
218 g — catalog reference weight. Matched to the printed series, bore, stroke, cover and magnetic-option weight reference. Catalog weights and estimates are for reference only; actual product weight prevails.
Force Reference
Calculated theoretical force at 0.5 MPa: extension 157.0 N; retraction 131.9 N, using bore 20 mm and rod diameter 8 mm. This pressure × effective-area calculation excludes friction, acceleration and safety/load factors; it is not a guaranteed usable load. Check the actual operating pressure and mechanism load.
Internal Components and Materials
| Component |
Catalog material |
| Tube |
Stainless steel |
| Piston rod |
S45C, hard-chromed and ground |
| Front / rear covers |
Aluminum alloy |
| O-rings |
NBR |
| Bumper |
TPU |
| Wear ring |
Wear-resistant material |
| Magnet |
Plastic magnet |
Series Ordering Reference
Standard strokes listed for this bore and operating variant: 10, 15, 20, 25, 30, 40, 50, 60, 75, 80, 100, 125, 150, 175, 200 mm. These are alternative order selections; they are not additional travel available from the current cylinder.
The catalog separately lists a long-stroke construction range of 201–500 mm. It is distinct from the standard-stroke list above; use the long-stroke dimensions and weights for that range. The separately printed maximum and permissible strokes are 500 and 800 mm respectively.
Select the operating variant, bore, stroke, magnetic option, rear-cover form, mounting accessory and pipe-thread option from the corresponding ordering chart. Do not transfer rear-cover or mount choices between single-rod, double-rod and adjustable-stroke versions without checking their dedicated row.
Selection, Installation and Use
- Select the bore and operating pressure from the required force, then check the stroke, moving load, speed, cushioning and mounting method for the mechanism.
- Flush the air lines before connection. Keep sealing tape or sealant clear of the first 1–2 thread turns and prevent water, particles or corrosive gases entering the cylinder.
- Keep the rod axis aligned with the load. Provide guides or supports where needed; avoid direct side loading and twisting of an unguided piston rod.
- Start speed adjustment with the flow-control valve closed and open it gradually. Meter-out control is the usual reference circuit; verify the actual single-acting or double-acting circuit.
- Factory-prelubricated cylinders can be used without additional lubrication. If a lubricator is used, the general instructions specify additive-free ISO VG32 turbine oil and continued lubrication.
- Isolate the air supply and exhaust residual pressure before servicing. Secure retained loads and prevent unexpected movement on restart. Protect against freezing, corrosion and strong external magnetic fields where magnetic sensing is used.
Circuit-selection reference at a theoretical 500 mm/s: for 20 mm bore the general catalog lists effective area 0.8 mm², valve examples 5V110M5 / 5V120M5, pneumatic-pilot alternatives 4A110M5 / 4A120M5, flow control PTLM5, silencer BSLM5, and tubing 6 mm OD × 4 mm ID. These are selection examples, not included components or a guaranteed installed speed; check actual port/thread adapters, pressure loss, tube length and load.
