Specifications: RMH25X800ST is a 25 mm bore, 800 mm stroke RMH magnetically coupled rodless cylinder. Magnetically coupled rodless cylinder with miniature linear guide.
Product Catalog
Download Airtac Product Catalog (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
Code
Meaning
RMH
Magnetically coupled rodless cylinder with miniature linear guide
25
25 mm cylinder bore
X800
800 mm stroke
S
Position-sensing magnet included
T
NPT port-thread option
Technical specifications
Parameter
Details
Acting type
Double acting
Fluid
Air filtered through a 40 μm element
Operating pressure
0.2–0.7 MPa
Proof pressure
1.2 MPa
Operating temperature
−20 to +70 °C
Operating speed
50–400 mm/s
Stroke tolerance
0 / +1.5 mm
Safe magnetic holding force
345 N
Air port
NPT1/8
Cushioning
Fixed cushioning
Maximum catalog stroke for this bore
800 mm
Current configuration dimensions
Dimensions are millimeters unless a thread is shown. Each letter follows the source drawing; the letters are not interchangeable with overall length or hole spacing. Values marked “+ stroke” below include this product’s stroke. Read the drawing for diameter symbols, depths and mounting orientation.
Parameter
Details
A + stroke
937 mm (137 + 800)
AD
17.5
AF
77
B
76
C
45
CA
43
D
27.8
E
22.5
F
12.5
G
2
H
21.5
I
M14×1.5
J
9.5
JA
5.5
JB + stroke
924 mm (124 + 800)
JC
20
K
M5×0.8 depth6
KB
40
KC
28
L
M6×1 depth8
LA
M6×1 depth8
LB
26
LC
7
LD
5.5
LE
12
M
1.5
P
NPT1/8
PA
0
PB
11
PC
22
PD
0
Q
43.5
S
16
T
22
N
17
N × 50 mm
850 mm
Stroke adjustment
≤ 16 mm
For detailed product dimensions and mounting drawings, please download and refer to the PDF catalog.
Guide loading and stroke-dependent limits
Parameter
Details
Maximum load for catalog arrangement 1
4.8 kg, at strokes up to 500 mm
Maximum load for catalog arrangement 2
8 kg, at strokes up to 500 mm
The two arrangements are different load orientations in the source diagrams. For longer strokes, use the corresponding load / stroke curve. Do not apply either maximum indiscriminately to a side-mounted or offset load. The body and guide permit top or side workpiece mounting; both air connections are on the same side.
Cushioning options
Parameter
Details
Current standard equipment
Two adjustment screws and fixed cushioning
Optional external absorber for this bore
ACA1412-1
The 2022 specification identifies fixed cushioning and separately optional external hydraulic shock absorbers. An optional absorber is not included merely because the family overview discusses cushioning.
Magnetic coupling and intermediate stopping
The piston and external carriage are coupled magnetically, with no mechanical link through the cylinder wall. Keep the working load and impact energy within the catalog limits; excessive pressure or stopping energy can separate the coupling.
Parameter
Details
Maximum pressure with an external intermediate stop
0.55 MPa
Maximum permitted kinetic energy for an intermediate stop made by the pneumatic circuit
0.45 J
These are two separate stopping methods in the RMS installation instructions. Use a shock absorber at an external limit stop, adjust it for smooth deceleration and provide cushioning at both ends. For a pneumatic intermediate stop, check the energy limit. The guided series refers back to these RMS precautions; none of these figures permits pressure above the operating specification.
Internal structure and materials
1. Left fixed cover: Aluminum alloy.
2. Body: Aluminum alloy.
3. C retaining ring: TPU (as printed).
4. O-ring: NBR.
5. Flat washer: Stainless steel.
6. Dust scraper: Plastic.
7. Body cover: Aluminum alloy.
8. O-ring: NBR.
9. Magnet: Rare-earth material.
10. Outer magnet spacer: Cold-rolled steel.
11. Magnet: Rare-earth material.
12. Inner magnet spacer: Cold-rolled steel.
13. Connecting rod: Stainless steel.
14. Wear ring: Wear-resistant material.
15. Piston seal: TPU.
16. Bumper: NBR.
17. Piston: Aluminum alloy.
18. Stainless tube: Stainless steel.
19. Hex nut: Stainless steel.
20. O-ring: NBR.
21. Right fixed cover: Aluminum alloy.
22. Steel ball: Stainless steel.
23. Plug screw: Medium-carbon or low-carbon alloy steel.
24. Fixing plate: Aluminum alloy.
25. Press block: Plastic.
26. Magnet: Rare-earth material.
27. Connecting block: Aluminum alloy.
28. Hex-socket countersunk screw: Alloy steel.
29. Miniature linear-guide assembly: Assembly.
30. Hex-socket countersunk screw: Alloy steel.
31. Hex-socket countersunk screw: Alloy steel.
32. Bumper: TPU.
33. Hex nut: Alloy steel.
34. Adjustment screw: Alloy steel.
Position sensing
The dedicated product and sensor selection tables specify H-profile magnetic sensors for this series and size. Select the full sensor order code separately for the required output, voltage, cable and connector; the profile letter does not identify the electrical specification. Sensor switches and separately ordered holders are not included unless the product configuration expressly lists them.
The source thrust-versus-pressure graphs extend to 1.0 MPa for illustration. This does not increase the 0.7 MPa maximum operating pressure. Use the appropriate load / speed graph and the safe magnetic holding-force limit when sizing.
Pneumatic circuit selection reference
The 2022 selection example for a 25 mm cylinder bore uses a theoretical speed of 500 mm/s and an effective flow area of 1.3 mm². It is a circuit-sizing example, not a guaranteed installed speed or a supplied package. Match the actual cylinder port, valve capacity and tubing. This product uses NPT1/8; a reference accessory with a different thread is not a direct screw-in connection.
Parameter
Details
Single / double solenoid valve example
5V110M5 / 5V120M5
Single / double air-pilot valve example
4A110M5 / 4A120M5
Flow control / silencer example
PTLM5 / BSLM5
Tube outside / inside diameter
6 / 4 mm
Installation and operating conditions
Flush the piping before connection and use clean, conditioned compressed air with the filtration specified for this cylinder. Keep sealant clear of the first 1–2 thread turns.
Align the actuator and load; provide protection from moving parts and unexpected motion after a loss or restoration of air or electrical power. Exhaust residual pressure before maintenance or removal.
Start with the flow-control valve closed and open gradually to the required speed. Check cushioning against the actual speed, load and stopping energy; a closed-center valve does not guarantee prolonged load holding or precise intermediate stopping.
Protect the sliding surfaces, prevent moisture from freezing and keep contaminants out of the ports. Protect stored equipment from corrosion. Follow the dedicated lubrication instructions; where continued lubrication is selected, the general catalog specifies additive-free ISO VG32 turbine oil.
Optional magnetic sensors and matching cables
H-profile: CMSH — standard/A05 reed sensorsTwo-wire reed operation at 5–240 V AC/DC.CMSH-020, CMSH-030, CMSH-050, CMSH-100, CMSH-M08, CMSH-M08010, CMSH-M08020, CMSH-M08030, CMSH-M12, CMSH-M12010, CMSH-M12020, CMSH-M12030, A05-CMSH-020, A05-CMSH-030, A05-CMSH-050, A05-CMSH-100
H-profile: CMSH — high-temperature reed sensors (final -H suffix)Two-wire reed operation at 5–240 V AC/DC.CMSH-020-H, CMSH-030-H, CMSH-050-H, CMSH-100-H, CMSH-M08-H, CMSH-M08010-H, CMSH-M08020-H, CMSH-M08030-H, CMSH-M12-H, CMSH-M12010-H, CMSH-M12020-H, CMSH-M12030-H
H-profile: DMSH — two-wire electronic sensorsTwo-wire electronic operation at 10–28 V DC.DMSH-020, DMSH-030, DMSH-050, DMSH-100, DMSH-M08, DMSH-M08010, DMSH-M08020, DMSH-M08030, DMSH-M12, DMSH-M12010, DMSH-M12020, DMSH-M12030, DMSH-020-W, DMSH-030-W, DMSH-050-W, DMSH-100-W, A05-DMSH-020, A05-DMSH-030, A05-DMSH-050, A05-DMSH-100, A06-DMSH-020, A06-DMSH-030, A06-DMSH-050, A06-DMSH-100
H-profile: DMSH — NPN electronic sensorsNPN three-wire output with a 5–30 V DC supply.DMSH-N020, DMSH-N030, DMSH-N050, DMSH-N100, DMSH-NM08, DMSH-NM08010, DMSH-NM08020, DMSH-NM08030, DMSH-NM12, DMSH-NM12010, DMSH-NM12020, DMSH-NM12030, DMSH-N020-W, DMSH-N030-W, DMSH-N050-W, DMSH-N100-W
H-profile: DMSH — PNP electronic sensorsPNP three-wire output with a 5–30 V DC supply.DMSH-P020, DMSH-P030, DMSH-P050, DMSH-P100, DMSH-PM08, DMSH-PM08010, DMSH-PM08020, DMSH-PM08030, DMSH-PM12, DMSH-PM12010, DMSH-PM12020, DMSH-PM12030, DMSH-P020-W, DMSH-P030-W, DMSH-P050-W, DMSH-P100-W
H-profile: EMSH — miniature two-wire sensorsMiniature two-wire electronic operation at 10–28 V DC.EMSH-020, EMSH-030, EMSH-050, EMSH-100, EMSH-M08, EMSH-M08010, EMSH-M08020, EMSH-M08030, EMSH-M12, EMSH-M12010, EMSH-M12020, EMSH-M12030, EMSH-020-W, EMSH-030-W, EMSH-050-W, EMSH-100-W, EMSH-M08-W, EMSH-M08010-W, EMSH-M08020-W, EMSH-M08030-W, EMSH-M12-W, EMSH-M12010-W, EMSH-M12020-W, EMSH-M12030-W, A05-EMSH-020, A05-EMSH-030, A05-EMSH-050, A05-EMSH-100, A06-EMSH-020, A06-EMSH-030, A06-EMSH-050, A06-EMSH-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
The listed options are alternatives, not a required set. The H in CMSH/DMSH/EMSH identifies the sensor profile; a final -H on a CMS order code instead selects the high-temperature reed version.
CMSH reed sensors are limited to 100 mA, 10 W and 200 Hz, with no internal consumption or leakage. Standard/A05 voltage drop is at most 2.5 V at 100 mA DC; versions with the final -H suffix have no residual voltage or indicator LED.
Two-wire DMSH and EMSH require 2.5–100 mA loads, up to 2.8 W and 1,000 Hz. Maximum consumption, residual voltage and leakage are 3 mA, 3.5 V and 0.06 mA respectively.
NPN/PNP DMSH outputs are rated to 30 V / 200 mA, 6 W and 1,000 Hz. Maximum consumption, residual voltage and leakage are 5 mA, 0.7 V and 0.01 mA respectively. Check controller input compatibility as well as load ratings.
Sensor and female-cable endings 020/030/050/100 mean 2/3/5/10 m. M08/M12 sensors have M8/M12 male connectors on 0.5 m leads; M08010/M08020/M08030 and M12010/M12020/M12030 give 1/2/3 m leads. Lead length does not depend on cylinder stroke.
Match female cables to the male connector size and wire count; direct-lead sensors need none. B pinout: 1 brown (+), 4 blue (−), 3 unused. C pinout: 1 brown (+), 3 blue (−), 4 black output. Check the mating cable and connector ratings separately.
A05 flex-resistant robotics cable and A06 oil-resistant flex cable have a recommended minimum bend radius of 19 mm. Both are two-wire direct-lead types, without M8/M12, NPN/PNP or W options; A05-CMSH also excludes the final high-temperature -H suffix. W means waterproof: DMSH-W has direct leads only; the listed EMSH-W options also include connectors.
Sensor temperature limits are −10 to +70°C, or −10 to +125°C for CMSH versions with the final -H suffix. The RMH cylinder remains limited to +70°C. Ordinary, high-temperature and A05 sensors are IP64; W/A06 are IP68. These ratings do not extend to the cylinder, connectors or whole assembly; use their common limits.
CMS has no protection circuit; DMS/EMS have reverse-polarity and surge protection, and EMS also has temperature-overload protection. Reed, two-wire electronic, NPN and PNP circuits are not interchangeable. Complete and insulate wiring before powering it; keep it separate from power/high-voltage wiring. For direct leads, connect brown and blue in series with the load on two-wire types; do not connect the switch alone across the supply. On three-wire types, brown is positive supply, blue is negative and black is output; connect an NPN load to positive and a PNP load to negative.
Install the selected H-profile sensor in the matching sensor groove on the RMH body, using the position-sensing magnet included in this S configuration. Loosen the locking screw so it does not project below the sensor base. Slide the sensor to the required position, then tighten. Set detection at the actuation-range centre. Recommended sensor-screw torque is 0.15–0.20 N·m, never over 0.25 N·m; these are not cylinder mounting torques. Prevent impacts; keep cables free of strain and avoid unnecessary movement or bending. Observe the stated bend-radius guidance for flex-resistant versions, and inspect fixings, cables and indication.
Keep ordinary sensors dry and do not immerse waterproof types for long periods. Avoid explosive gas, aggressive chemicals, sudden temperature changes, welding interference and magnetic debris. Provide suitable protection for A05 cables exposed to heat, dust, water or oil, and for A06 cables exposed to weld spatter.
Optional air connections, tubing and controls
The RMH chamber connections are on the same side of the cylinder; connect each selected port to its separate valve A/B line. The two NPT cylinder-side options require exact 1/4 inch OD soft nylon/PU tubing. They are separate catalog options, not conversions of the original 6 mm metric circuit reference. The listed metric PU and valve-side fittings below do not fit these inch tube sockets. An inch-tube order code and a compatible metric/inch transition kit are not specified; select compatible tubing and verify every valve-side connection and the complete flow path before assembly. Do not use approximate outside diameters or substitute PT/G threads.
NPC1/4-1/8: NPT1/8 male × exact 1/4 inch tube ODIndependent inch-tube cylinder-side straight option; not a metric-reference replacement
NPTL1/4-1/8A: NPT1/8 male × exact 1/4 inch tube OD; A-typeIndependent inch-tube cylinder-side meter-out option; not a metric-reference replacement
PC6M5: M5×0.8 male × 6 mm tube ODStraight fitting at the reference valve A/B work ports
PC601: PT1/8 male × 6 mm tube ODOnly for the separate 4A pilot port when its line uses this exact metric tube OD
US98A060040100MBU: polyester polyurethane; 6 mm OD × 4 mm ID; blue, 100 m rollOptional straight tubing example; cut to the required installed length
UE95A060040100MBU: polyether polyurethane; 6 mm OD × 4 mm ID; blue, 100 m rollOptional straight tubing example; cut to the required installed length
5V110M5A050, 5V110M5A200, 5V120M5A050, 5V120M5A200: M5×0.8 female main ports; M5×0.8 female exhaust ports; terminal-cable version220 V AC solenoid direction control for carriage travel in either direction
5V110M5B050, 5V110M5B200, 5V120M5B050, 5V120M5B200: M5×0.8 female main ports; M5×0.8 female exhaust ports; terminal-cable version24 V DC solenoid direction control for carriage travel in either direction
5V110M5C050, 5V110M5C200, 5V120M5C050, 5V120M5C200: M5×0.8 female main ports; M5×0.8 female exhaust ports; terminal-cable version110 V AC solenoid direction control for carriage travel in either direction
5V110M5E050, 5V110M5E200, 5V120M5E050, 5V120M5E200: M5×0.8 female main ports; M5×0.8 female exhaust ports; terminal-cable version24 V AC solenoid direction control for carriage travel in either direction
5V110M5F050, 5V110M5F200, 5V120M5F050, 5V120M5F200: M5×0.8 female main ports; M5×0.8 female exhaust ports; terminal-cable version12 V DC solenoid direction control for carriage travel in either direction
The NPT A-type controller restricts cylinder-to-tube exhaust and permits free charging; fitting/controller limits are 0–1 MPa and −20 to +70°C. Use the specified tapered-thread seal and full tube insertion. Maximum controller-cap rotation torque is 0.08 N·m, not thread-tightening torque.
The listed complete valve and metric tube options belong to the original metric reference only. They do not validate a complete inch branch or its speed; the two chamber paths require separately verified connections.
5V110 is single-solenoid spring return; 5V120 is double-solenoid with memory. Final 050/200 selects a 0.5/2 m terminal cable, not a DIN plug. AC tolerance is +15%/−10% (2.0 VA); DC is ±10% (1.6 W). Select the electrical or pneumatic control scheme.
The existing 4A110M5/4A120M5 pneumatic alternatives require one/two external pilot signals through separate PT1/8 pilot ports. The listed pilot fitting assumes 6 mm OD pilot tubing; match both ends and seal the tapered pilot thread.
With these selected valves, the RMH control branch is limited to 0.2–0.7 MPa and −20 to +70°C, subject to temperature derating and any lower component limit. Select flow for the RMH 50–400 mm/s operating range; the reference sizing point of 500 mm/s does not increase that limit. Apply the lower external-intermediate-stop pressure limit and the pneumatic-stop energy limit stated for the selected stopping method.
BSLM5 fits these selected valve exhaust ports R/S (M5×0.8), not cylinder work ports. Silencer limits are 0–1 MPa and −20 to +70°C.
The two blue 100 m tube codes are alternative packaging examples, not required installed lengths. US98A polyester-PU is rated −20 to +70°C; UE95A polyether-PU −40 to +70°C. Both are rated 1 MPa at 23°C; minimum bend radii (US/UE) are 15/12 mm. Apply temperature derating and the lowest component limit; avoid solvents, corrosive media and prolonged sunlight.Weight reference
3716 g estimated reference. This is a configuration reference, not an independently measured net weight of the complete mounting package. The catalog states that actual product weight governs. Packaging and shipping weight are not included.
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