OEM Factory Direct 4V210 Series 5/2 Way Pneumatic Solenoid Valve Manufacturer Single Double Coil Air Control Valve Compatible With Airtac SMC

Product Detailed Description:

The CMK2 Series is CKD's benchmark medium bore cylinder, engineered for general-purpose industrial automation where reliability and corrosion resistance are non-negotiable. Bore sizes span 20 mm to 40 mm with standard strokes from 5 mm to 750 mm.

The defining characteristic is its all-weather construction: the piston rod, rod-end nut, tie rods, tie-rod nuts, and cushion valve bodies are all stainless steel as standard. Combined with the hard-anodized aluminum tube, this provides corrosion resistance far exceeding typical general-purpose cylinders in its class — making the CMK2 suitable for outdoor installations, washdown areas, and humid factory environments.

The series offers exceptional variant coverage. CMK2 (standard) is double-acting with single rod. CMK2-S provides single-acting spring return for fail-safe applications. CMK2-P and CMK2-R add stroke adjustment capability for precision hard-stop positioning. CMK2-M incorporates an internal non-rotating guide mechanism. A wide range of self-clinching (caulked) variants allows permanent OEM integration as a lifetime, non-serviceable component.

The square rod cover enables direct mounting without brackets for the lowest possible profile. A comprehensive accessory range covers every installation scenario.

Application Industries:

The CMK2 is deployed across general automation and assembly lines for small-part pressing, clamping, diverting, and transfer operations where its stainless steel hardware ensures reliable performance in humid or mildly corrosive factory environments. In packaging machinery, it actuates carton flaps, ejects small products, positions label applicators, and closes seal jaws with consistent repeatability.

The food and beverage processing sector benefits from the CMK2's standard stainless construction, using it for diverter gate actuation, filling valve positioning, and small conveyor stops in washdown areas where zinc-plated cylinders would quickly corrode. Textile and apparel machinery employs the CMK2 for thread trimmer actuation, presser-foot lift, small-press platen operation, and label tag application.

In electronics assembly, the CMK2 provides PCB fixturing, test-probe actuation, small connector pressing, and conformal coating mask clamping. Medical device manufacturing uses it for syringe assembly, vial capping, test-strip feeding, and instrument fixturing.

The printing and converting industry relies on the CMK2 for small-format impression cylinder engagement, paper guide positioning, and ink-jet head lift. Outdoor and humid environment applications — gate actuators, agricultural equipment, wastewater treatment valve actuation — are where the CMK2's full stainless external hardware truly differentiates it from standard cylinders. Machine tool auxiliary functions and woodworking clamp, guard, and press operations complete its application profile.

Product Feature:

1. Pilot mode: external and internal optional;

2. Sliding column structure, good sealing and sensitive reaction;

3. Three-position solenoid valves have three central functions to choose from.

4. Dual-head two-position solenoid valve has memory function.

5. The inner hole is processed by special technology, which has low friction resistance, low starting pressure and long service life.

6. No need for oil and lubrication;

7. The valve group can be integrated with the base to save installation space.

8. Manual device is attached to facilitate installation and commissioning.

9. There are many kinds of standard voltage grades to choose from.

Specification：

Customization Options

Product Advantages

• Full stainless steel external components — standard, not optional. The piston rod, rod-end nut, four tie rods, tie-rod nuts, and cushion needle valves are all stainless steel as the default specification. Most competing cylinders use zinc-plated carbon steel tie rods that begin rusting within months. The CMK2 provides lifetime corrosion resistance at no extra cost.

• Square rod cover — direct mounting without brackets. The front rod cover is machined square with through-holes, allowing the cylinder to be bolted directly to a flat mounting surface. This eliminates the cost, height, and alignment complexity of foot brackets — the cylinder sits flush against the machine frame for the lowest possible installed profile.

• Self-clinching (caulked) variant for OEM integration. Uses a rolled-joint assembly instead of threaded tie-rod nuts. Reduces part count, eliminates tie-rod loosening from vibration, and delivers a tamper-proof, lifetime-sealed cylinder at lower cost than the serviceable version. Ideal for high-volume OEM equipment.

• Stroke adjustable variants — built-in precision stops. CMK2-P (extend adjustable) and CMK2-R (retract adjustable) incorporate a threaded stop directly into the cylinder. Set precise mechanical stop positions without external hard stops or custom fixture machining. Ideal for fine-tuning during setup or between product runs.

• Non-rotating variant — compact anti-rotation. The CMK2-M uses an internal guide mechanism to prevent piston rod rotation without adding width, height, or external guide rails. Provides guided-cylinder functionality within a standard round-body footprint.

• Hard-anodized aluminum tube — internal protection. The cylinder tube is hard-anodized internally, creating a wear-resistant, corrosion-resistant bore surface. Combined with stainless external components, the CMK2 withstands both internal wear and external environmental attack.

• CKD CMK2 1:1 dimensional replacement. All mounting dimensions, tie-rod spacing, port locations, rod-end threads, and accessory interfaces match CKD CMK2 specifications exactly. Drop-in replacement with no modifications.

Application：

• General Industrial Automation: Assembly stations, packaging machinery, material transfer systems
• Machine Tools: Workpiece clamping, tool changing, feed mechanisms
• Woodworking Machinery: Pressing, positioning, panel conveying
• Textile Machinery: Tension control, guide roller actuation, yarn handling
• Food & Beverage: With optional stainless steel rod and food-grade lubricant
• Automotive Manufacturing: Welding fixtures, body assembly lines, component testing
• Printing & Converting: Roller positioning, cutting blade actuation, registration control

Installation and Usage：

• Mounting: Square rod cover allows direct bolting without brackets — the lowest-profile method. Alternatively, use LB foot bracket, FA/FB flange, CR trunnion, or CA/CB clevis. Loosely tighten bolts, cycle full stroke 2–3 times to self-align, then torque to specification.
• Piping: Connect air tubing to both ports. Ports are Rc (PT) tapered thread — use compatible fittings with thread sealant. For speed control, install one-way flow control valves with meter-out control.
• Air supply: Use compressed air filtered to 40 μm or finer. Lubricated or non-lubricated operation acceptable. Maximum working pressure: 1.0 MPa (10 bar).
• Cushioning (air cushion type): Start with cushion needle valves fully closed. Cycle the cylinder and gradually open until the load decelerates smoothly without hard bottoming. Do not overtighten.
• Stroke adjustment (CMK2-P/CMK2-R): Loosen the lock nut, turn the adjuster screw to set the stop position, re-tighten the lock nut. Verify with a dry cycle before loading.
• Side load prevention: Ensure load is aligned axially with the piston rod. Round-body cylinders are not rated for lateral loads — use a non-rotating variant (CMK2-M) or external guide if side forces are unavoidable.
• Corrosion protection: Stainless rod, tie rods, and nuts provide built-in protection. In washdown environments, also protect port fittings and tubing from direct spray.
• Long-term storage: Retract piston rod fully, apply anti-rust oil to exposed surfaces, install dust caps on ports. Store in a dry environment.

FAQ

Q1.CMK2 vs. 24N2A — how to choose?

A1.CMK2: round-body tie-rod, bore 20–40 mm, stainless hardware standard, CKD standard. 24N2A: ISO 6432, bore 16–25 mm, stainless barrel, Camozzi/Festo/SMC standard. Choose CMK2 for CKD compatibility and stainless tie-rods. Choose 24N2A for ISO multi-brand interchangeability.

Q2. Standard vs. self-clinching — which one?

A2. Standard (tie-rod): serviceable, seals replaceable. Best for end-users and maintainable equipment. Self-clinching (caulked): permanent assembly, non-serviceable, lower cost. Best for high-volume OEM where the cylinder is a lifetime component.

Q3. What mounting options are available?

A3. Direct mount (square rod cover — lowest profile), foot bracket (LB), front/rear flange (FA/FB), center trunnion (CR), clevis (CA/CB). All brackets are CKD-compatible.

Q4. What port thread type?

A4. Rc (PT) tapered thread as standard. G (BSPP) and NPT available as customization.

Q5. What routine maintenance?

A5.Wipe rod weekly. Check for leaks monthly. Verify stroke time quarterly. Replace seals annually if exceeding 2 million cycles. Tie-rod design allows seal replacement without demounting.

Q6. Can I replace seals myself?

A6. Yes for standard type — unscrew four tie-rod nuts, remove cover, replace seals, reassemble. Self-clinching type is non-serviceable — replace the entire cylinder.

Q7. Direct replacement for CKD CMK2?

A7.Yes — 1:1 dimensional match. Same mounting, tie-rod spacing, ports, rod threads, and accessory interfaces. Drop in and reconnect..

Q8. What warranty?

A8. 12–18 months against manufacturing defects. Free replacement for valid claims. Seal kits and repair videos provided. Samples ship within 3 working days.