Specifications: M3Y21008T is an AirTAC M3 control valve with 3 ports, 2 positions, a hand lever actuator and NPT 1/4 inch connections. Code 210 selects the 200 series single-control body.
Product Catalog
Download Airtac Product Catalog (PDF)
For detailed product dimensions and mounting drawings, please download and refer to the PDF catalog.
Functional Alternative Statement
Airtac M3 series valves are functional alternatives to SMC VM400 series valves.
Model Code Explained
| Parameter |
Details |
| Exact ordering code |
M3Y21008T |
| Series M3 |
3 ports, 2 positions; external direct mechanical control |
| Control-head code Y |
Hand lever |
| Body code |
210 = 200 series, single control |
| Port-size code 08 |
NPT 1/4 inch |
| Thread option |
T = NPT |
| Color suffix |
Not used for this control-head type |
Technical Specifications
| Parameter |
Details |
| Fluid |
Air, filtered through a 40 μm filter element |
| Operating method |
External direct acting |
| Valve function |
3 ports, 2 positions |
| Selected control form |
hand lever |
| Working connection |
NPT 1/4 inch |
| Effective flow area |
12.0 mm² |
| Cv |
0.67 |
| Operating-pressure range |
0–1.0 MPa (0–145 psi) |
| Proof pressure |
1.5 MPa (215 psi) |
| Working temperature |
−20 to 70 °C |
| Body material |
Aluminum alloy |
| Lubrication |
Not required |
Features and Pneumatic Operation
The sliding-column construction has internal sealing and a control force that the catalog states is unaffected by working pressure, with no back-pressure effect. The exhaust connections are placed above the body to make it easier to fit a suitable silencer and reduce exhaust noise and contamination; a silencer is not specified as included.
The selected control head is manually operated. The available head forms serve different operator controls; only the head encoded in this exact model is selected here.
The catalog identifies this control-head family as using a metal mechanism for durability and stable operation. That statement does not assign an unspecified material to every internal component.
Lubrication is not required. If lubricated air is introduced, continue using the same lubrication medium without interruption; the catalog recommends ISO VG32 oil or an equivalent grade.
Port letters identify P as the supply, A as the controlled outlet and R as exhaust. The graphical symbol in the PDF defines the exact flow paths for the selected actuator and valve position.
Selected Operating Travel
| Parameter |
Details |
| Selected Y-lever travel |
The reversal-stroke table does not give a numerical Y-lever stroke. Use its dedicated lever drawing; a pushbutton or roller stroke is not substituted. |
The listed stroke ranges are installation limits for the selected control form. Travel is not an added body dimension. Use the drawing orientation and do not drive the mechanism past its stated range.
Installation, Travel Limits and Operation
Mount the valve through the body fixing points or use the illustrated panel arrangement where the selected head permits it. Keep the body and head aligned and retain access to the pneumatic ports. The catalog does not state a general screw-tightening torque.
Do not exceed the selected spool and actuator stroke ranges. Excess travel imposed by the external mechanism can cause leakage or damage. Engineering-plastic button components must be operated by hand and must not be struck with metal tools; the dedicated mechanical roller/plunger models are actuated by their intended external mechanism.
This control form is manually reset. Return the lever or selector deliberately to the required position; it is not described as an automatically returning pushbutton.
Body and Mounting Dimensions
The M3 common-body table uses the basic B valve as its dimensional reference. The selected Y control head has its own drawing below; body and head references must not be added into an invented overall envelope.
| Drawing reference |
Value |
| Drawing dimension A |
35 mm |
| Drawing dimension B |
22 mm |
| Drawing dimension C |
64 mm |
| Drawing dimension D |
58 mm |
| Drawing dimension K |
4.3 mm |
| Drawing dimension KA |
23.5 mm |
| Drawing dimension KB |
18.5 mm |
| Drawing dimension KC |
20 mm |
| Drawing dimension PA |
20 mm |
| Drawing dimension PB |
18.5 mm |
| Drawing dimension PC |
28.5 mm |
| Drawing P — three ports |
NPT 1/4 inch |
| Body mounting holes |
3 × Ø4.3 mm through-holes |
Selected Control Head and Replacement Reference
The values below describe the selected actuator or control-head assembly. They are separate from the body drawing and must not be added indiscriminately to the body dimensions.
| Control-head drawing reference |
Value |
| Head height reference |
42 mm |
| Head base length |
33.5 mm |
| Plan length reference |
37 mm |
| Head width |
16.5 mm |
| Local vertical reference |
17 mm |
| Lower vertical reference |
10.5 mm |
The M3 catalog explicitly lists control-head assembly M3Y210-P13A for this head family. The M3/S3 prefix on a shared replacement head is retained exactly; it does not change this valve’s M3 ordering code. This valve includes its selected actuator; a second head is not required for normal operation.
Dimension Drawing Reminder
All linear drawing values above are in millimeters unless a thread or angle unit is stated. The original drawings retain the dimension-arrow relationships, actuator orientations and port views that cannot be fully represented by a two-column table.
For detailed product dimensions and mounting drawings, please download and refer to the PDF catalog.
Internal Components — Catalog Reference
The sectioned illustration is labeled M3R210. Its numbered components are listed below as a series construction reference. This is not a spare-parts kit or an assertion that every actuator variation has an identical exploded assembly. Materials are stated only where the catalog expressly supplies them.
| Drawing item |
Component |
| 1 |
Bottom cover |
| 2 |
Hex-socket screw |
| 3 |
Spring |
| 4 |
Spacer |
| 5 |
Body |
| 6 |
Cross-head screw |
| 7 |
Roller holder |
| 8 |
Roller |
| 9 |
Rotating block |
| 10 |
Axle |
| 11 |
Cross-head screw |
| 12 |
Front cover |
| 13 |
Piston O-ring |
| 14 |
Spool |
| 15 |
Positioning block |
Flow Characteristics
The catalog flow chart for M3B-210-08 plots operating pressure in MPa on the vertical axis from 0 to 1.0, and flow in L/min on the horizontal axis from 0 to 1300. The family of curves illustrates the pressure/flow relationship. Axis limits are graph bounds, not guaranteed rated flow values for this complete valve; use the supplied curve and the required pressure conditions.
Supply Scope and Related Heads
This ordering code identifies one valve with its selected control-head form. It does not encode a multiple-valve assembly, a spare head, a silencer, mounting-panel hardware or pneumatic tubing. Where the catalog lists a separately orderable head, its exact code is given above as a replacement reference; the source does not provide a screw/gasket quantity breakdown for a service kit.
Series Ordering Options
The M3 common range offers B, C, D, Y, R and L heads; red-only PL; and PP, PF, PM and HS in red, green or black. The 110 body uses 06 ports only; the 210 body offers 06 or 08. The separate 05 mini range has B, R and L heads only. Mini models do not use the 110/210 code or a PT/G/NPT suffix.
For 1/8 and 1/4 inch connections, a blank thread suffix means PT, G means G thread and T means NPT. M5 connections have no such thread suffix. These are series alternatives; the selected configuration is the one decoded above.
Reference Weight
Catalog reference weight: 146 g, from the M3Y210 row of the 2022 comprehensive catalog weight table (paper page 300). The table distinguishes the selected series size and control-head type. Its reference does not separately list port, color or thread variants. The table states that weights are for reference only; actual weight is determined by the delivered product. This is not a measured or packaged shipping weight.
Catalog Basis
Technical information is taken from the linked M3 catalog and cross-checked against the 2022 comprehensive catalog, paper pages 143–145 (PDF pages 144–146). The paper-page-300 weight table is cited separately above. No unrelated series dimensions or weights are substituted.
Optional Piping Accessories
P = this M3 valve’s supply (NPT1/4); W = its controlled working port A (NPT1/4); E = its exhaust port R (NPT1/4). All three ports are female threaded connections. The drawing callout 3-P identifies three same-size ports; it does not mean three supply ports. Silencers serve E only; ASC and GAFR connect upstream of P only. Keep supply, working and exhaust circuits separate. No pilot or manifold route is assigned. Multiple keys retain each use. Tube OD is mm (in = inches); compression/tubing show OD × ID. These piping accessories are optional and ordered separately.
Code-prefix uses (match the longest listed family prefix): ASC inline threaded flow control; GAFR upstream filter-regulator; NBB male–male; NBD male–female; NBESL adjustable silencer; NBKC compression fitting; NBPC metal straight; NBSL silencer; NBSLM miniature silencer; NPC straight; NPEB branch tee; NPED run tee; NPH banjo elbow; NPHF female branch banjo; NPHW twin banjo; NPKD reducing distribution fitting; NPL elbow; NPLL extended elbow; NPSA inline flow control; NPSS flow control; NPTL push-lock flow control; NPYB Y; NPZB cross.
| Use |
Size / complete codes |
| P |
ASC20008T,GAFR20008ST,GAFR30008ST |
| E,P,W (discontinued) |
male NPT1/2 ↔ male NPT1/4: NBB1/4-1/2
male NPT1/4 ↔ male NPT1/4: NBB1/4-1/4
male NPT3/8 ↔ male NPT1/4: NBB1/4-3/8
male NPT1/8 ↔ male NPT1/4: NBB1/8-1/4
male NPT1/4 ↔ female NPT1/8: NBD1/8-1/4
1/2 × 1/3 in: NBKC1/2-1/3-1/4
1/4 × 5/32 in: NBKC1/4-5/32-1/4
3/8 × 1/4 in: NBKC3/8-1/4-1/4
5/16 × 1/5 in: NBKC5/16-1/5-1/4
1/2 in: NBPC1/2-1/4,NPLL1/2-1/4
1/4 in: NBPC1/4-1/4,NPH1/4-1/4,NPHW1/4-1/4,NPLL1/4-1/4,NPSS1/4-1/4A,NPSS1/4-1/4B,NPZB1/4-1/4
3/8 in: NBPC3/8-1/4,NPH3/8-1/4,NPHW3/8-1/4,NPLL3/8-1/4,NPSS3/8-1/4A,NPSS3/8-1/4B,NPZB3/8-1/4
5/16 in: NBPC5/16-1/4,NPH5/16-1/4,NPHW5/16-1/4,NPLL5/16-1/4,NPSS5/16-1/4A,NPSS5/16-1/4B,NPZB5/16-1/4
1/4 in; male RA NPT1/4 / female RB NPT1/4: NPHF1/4-1/4
3/8 in; male RA NPT1/4 / female RB NPT1/4: NPHF3/8-1/4
5/16 in; male RA NPT1/4 / female RB NPT1/4: NPHF5/16-1/4
main 5/16 / branch 1/4 in: NPKD5/16-1/4-1/4 |
| E (discontinued) |
NBESL1/4 |
| E |
NBSL1/4,NBSLM1/4 |
| E,P,W |
1/2 in: NPC1/2-1/4,NPEB1/2-1/4,NPED1/2-1/4,NPL1/2-1/4,NPSA1/2,NPYB1/2-1/4
1/4 in: NPC1/4-1/4,NPEB1/4-1/4,NPED1/4-1/4,NPL1/4-1/4,NPSA1/4,NPTL1/4-1/4A,NPTL1/4-1/4B,NPYB1/4-1/4
3/8 in: NPC3/8-1/4,NPEB3/8-1/4,NPED3/8-1/4,NPL3/8-1/4,NPSA3/8,NPTL3/8-1/4A,NPTL3/8-1/4B,NPYB3/8-1/4
5/16 in: NPC5/16-1/4,NPEB5/16-1/4,NPED5/16-1/4,NPL5/16-1/4,NPSA5/16,NPTL5/16-1/4A,NPTL5/16-1/4B,NPYB5/16-1/4 |
Match PT/G/NPT exactly. Use the specified thread seal or face gasket. Match tube OD and compression OD/ID; metric and inch sizes are not interchangeable. Use suitable soft nylon/PU tube and check seating, clearance, bends and flow. Tighten compression bodies by the hex, not tube nuts. Where listed: D is black, blank grey, -M miniature; -S denotes only the specified 304 stainless parts.
NPSA are tube-side flow controls and need separate matching tube connections; they do not screw directly into P, W or E. NPHF use male RA at the valve; female RB requires its own matching male thread and seal and is not a tube socket. Match both adapter ends to their separate mating parts. Branches join one circuit. Keep supply P, working A and exhaust R separate; do not bridge these paths.
Standard push-in fittings, silencers and flow-control parts: ≤1 MPa, −20–70°C. NBPC/compression fittings/thread adapters: ≤1 MPa. The listed metal push-in, compression and adapter groups have a 0–150°C range, limiting the connected valve path to 0–70°C or narrower. Apply every stricter component limit; no system vacuum rating is established.
This mechanically or manually operated M3 valve operates at 0–1 MPa and −20–70°C with 40 µm filtered air. Accessory limits may narrow that range; proof pressure is not working pressure. The piping choices are optional and ordered separately, and do not establish separately orderable panel-mounting or internal-part kits.
Flow-control suffix A restricts thread→tube, with free reverse flow; suffix B reverses it. Supply normally flows tube→thread and exhaust thread→tube. At valve working port A, suffix A restricts flow to the actuator and suffix B the return; cylinder-mounted orientation differs. Follow the flow symbols, including NPSA. Closed controls are not leak-tight isolation. Adjust gently without forcing stops; depressurize before tube removal. Never cap an active supply, working or exhaust connection.
Silencers serve only exhaust R. Check flow capacity and back pressure, including adjustable silencers and remote exhaust lines; do not restrict the exhaust so that valve or actuator operation is impaired.
ASC is a separately connected upstream supply flow control, assigned to P only. Both female ports require matching male connections; follow its P/A markings. Its limits are 0.05–0.95 MPa and −20–70°C with ≤40 µm filtration. The complete valve path must meet these and every stricter component limit; the valve’s 0–1 MPa range does not extend the ASC rating.
GAFR is a separately connected upstream supply filter/regulator, assigned to P only. Both female ports require matching male piping; follow IN→OUT and check total flow and bowl/environment suitability. Inlet ≤1 MPa; regulation 0.15–0.9 MPa; −5–70°C, nonfreezing. Apply every stricter valve/component limit. Listed GAFR S versions have a 40 µm filter, PC bowl, differential/manual drain, bracket and round snap-in gauge (psi/bar), without a reverse-flow valve. Air lubrication is not required. If lubricated air is introduced, continue with consistent lubrication using ISO VG32 or equivalent oil.
NPTL maximum cap-adjustment torque: 1/4: 0.16 N·m. These are not thread-installation torques.
Items marked discontinued are historical service references, not current standard recommendations. Confirm availability or a manufacturer-approved replacement. An unmarked catalogue entry does not promise current production, stock or delivery. All listed options are ordered separately.
