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  3. NUMATICS NWB1391C-008-021

NUMATICS NWB1391C-008-021 Flow Control Fitting Tube Npt 8MM 1/4

Nwb1391c-008-021 Numatics Flow Control Fitting 8mm Tube Diameter 1/4 Inch Npt

( Brand: Numatics ), ( Manufacturer Part Number: NWB1391C-008-021 ), ( Part Type: Flow Control Fitting Tube )

Review NUMATICS Flow Control Fitting 8mm Tube Diameter 1/4 Inch Npt

The **Numatics NWB1391C-008-021** is a precision-engineered flow control fitting designed for pneumatic and hydraulic systems requiring reliable, adjustable regulation of compressed air or fluid flow. This high-performance component integrates seamlessly into industrial automation, manufacturing, and pneumatic control applications, offering a versatile solution for managing air pressure and flow rates with exceptional accuracy. Constructed from durable materials, the fitting features a robust **8mm tube connection** on one end, ensuring a secure and leak-proof interface for standard pneumatic tubing, while the opposite side is equipped with a **1/4" NPT (National Pipe Thread) male connection**, enabling straightforward integration into existing systems with threaded components such as valves, cylinders, or control lines. The **NWB1391C** series is part of Numatics renowned line of flow control solutions, known for their precision, durability, and ease of installation, making it an ideal choice for applications where consistent and adjustable airflow is critical.

At the heart of this fitting lies a **flow control valve mechanism**, allowing operators to fine-tune the airflow rate with a simple turn of the adjustment knob. This feature ensures optimal performance in applications such as pneumatic clamping, blow-off systems, or cylinder actuation, where precise control over air delivery is essential for efficiency and safety. The fitting s compact yet sturdy design minimizes dead space and reduces pressure drop, enhancing overall system performance while maintaining reliability under demanding operating conditions. Additionally, the **008-021** designation indicates a specific flow rate range, making it suitable for medium-duty applications where moderate airflow regulation is required without compromising on precision. Whether deployed in automated assembly lines, packaging machinery, or material handling systems, this fitting delivers consistent and repeatable results, contributing to smoother operations and reduced maintenance needs.

Numatics commitment to quality engineering is evident in the **NWB1391C-008-021**, which adheres to strict manufacturing standards to ensure longevity and performance. The fitting is built to withstand the rigors of industrial environments, including exposure to moisture, dust, and temperature fluctuations, while its corrosion-resistant materials and sealed construction prevent leaks and contamination. The **1/4" NPT thread** ensures a secure and leak-free connection to compatible components, while the **8mm tube fitting** provides a snug, vibration-resistant interface for tubing, reducing the risk of dislodgment during operation. For ease of use, the adjustment mechanism is designed for quick and intuitive calibration, allowing operators to achieve the desired flow rate with minimal downtime. Whether integrated into a new system or retrofitted into an existing setup, this fitting serves as a dependable solution for applications where airflow regulation is key to operational success.

### **Pros and Cons of buying a Numatics NWB1391C-008-021 Flow Control Fitting**

#### **Pros:**

1. **High Quality and Reliability** Numatics is a well-established brand in industrial automation, known for durable and precise pneumatic components. This fitting is designed for consistent performance in demanding applications.

2. **Compatibility with Pneumatic Systems** The fitting is designed for 8mm (5/16") tubing and features a 1/4" NPT connection, making it suitable for standard pneumatic circuits. It ensures proper sealing and flow control when integrated with compatible valves and actuators.

3. **Flow Control Functionality** The fitting includes a built-in flow control mechanism, allowing precise regulation of air flow. This is useful in applications requiring controlled movement, such as clamping, positioning, or cushioning in pneumatic systems.

4. **Easy Installation** The design is straightforward, with standard threading and tubing connections, reducing installation complexity. It can be quickly integrated into existing pneumatic setups without extensive modifications.

5. **Cost-Effective for Industrial Use** While not the cheapest component, it offers a balance between performance and price, making it a practical choice for medium to large-scale pneumatic applications rather than disposable or low-cost alternatives.

6. **Compatibility with Numatics Ecosystem** If you already use Numatics valves, cylinders, or other components, this fitting will seamlessly integrate, reducing the need for third-party adapters and potential compatibility issues.

7. **Durability** Made from materials suitable for industrial environments, it is resistant to wear, corrosion, and pressure fluctuations, ensuring long-term functionality.

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#### **Cons:**

1. **Limited Availability Outside Specialty Suppliers** This is a specialized component, and it may not be readily available at general hardware stores or large retail chains. Purchasing may require ordering from industrial distributors or online suppliers, which could involve shipping delays.

2. **Potential Overkill for Small-Scale Applications** If you are working on a small, low-pressure pneumatic project (e.g., hobbyist or DIY), this fitting may be more expensive than necessary. There are simpler, cheaper flow control options available for non-industrial use.

3. **Requires Proper Installation Knowledge** Incorrect installation, such as improper tubing compression or misalignment of threads, can lead to leaks or reduced performance. Users unfamiliar with pneumatic systems may need guidance or professional assistance.

4. **Dependence on Numatics Brand** If you are not already invested in Numatics products, switching to this fitting may limit future flexibility if you decide to use components from other brands. Some alternative brands may offer similar functionality at a lower cost.

5. **Potential for Counterfeit Products** As with many specialized industrial parts, there is a risk of purchasing counterfeit or low-quality replicas online. Buying from authorized distributors or reputable suppliers is essential to avoid performance issues.

6. **Maintenance Requirements** While durable, the fitting may require periodic checks for wear, especially in environments with dust, moisture, or extreme temperatures. Neglecting maintenance could lead to failures over time.

7. **Higher Upfront Cost** Compared to basic flow control valves or simple adapters, this fitting is more expensive. The cost may not be justified for applications where basic flow regulation is sufficient.

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### **Conclusion:**

The **Numatics NWB1391C-008-021** is a high-quality, reliable flow control fitting ideal for **industrial pneumatic systems** where precision, durability, and compatibility with Numatics components are priorities. It excels in applications requiring controlled air flow, such as automation, manufacturing, or heavy-duty machinery. However, it may not be the most cost-effective or practical choice for **small-scale, hobbyist, or non-industrial projects**, where simpler or cheaper alternatives exist.

For users already invested in Numatics systems or working in professional industrial settings, this fitting is a **strong recommendation** due to its reliability and seamless integration. For others, evaluating whether the added cost and complexity are justified for the specific application is crucial.

### **Recommendation:**

- **Buy it if:** You are working on an industrial pneumatic system, need precise flow control, and are already using or plan to use Numatics components. The investment in quality and compatibility will pay off in performance and longevity.

- **Avoid it if:** You are on a tight budget, working on a small-scale project, or can use a simpler flow control solution. In such cases, consider alternative brands or basic flow control valves to reduce costs without sacrificing functionality for your needs. Always verify the supplier s authenticity to ensure you receive a genuine product.

Details:

These services include: UPS 3 Day Select. Prices for these options may differ from standard ground shipping. The cost of combined shipping depends on weight, location buyer and size box.

Numatics NWB1391C-008-021 Flow Control Fitting, 8mm Tube Diameter, 1/4 NPT, 17mm Hex, 37.5mm Long, 7.2mm Thread length . UPS 2 Day Air AM. These services include Item is sold as pictured. UPS Next Day AM.

part #: nwb1391c008021 price

  • $13.99

specifications pneumativalv:

  • brand: Numatics
  • mpn: Nwb1391c-008-021
  • part type: Flow Control Fitting Tube

offer pneumativalv:

  • sold: 0
  • quantity: 10
  • best offers: True
  • started: April 27, 2026
  • options: Ship-to-home
  • availability: In Stock

seller pneumativalv:

  • rating: 100.0%
  • # reviews: 28438
  • city: Kawkawlin, Michigan

general pneumativalv:

  • Hydraulics, Pneumatics, Pumps Plumbing > Pump Flow Controllers > Pneumatic Controllers
  • condition: Used

shipping pneumativalv:

  • service: USPS Ground Advantage, UPS Ground, USPS Priority Mail, UPS Next Day Air
  • class: Standard, Expedited, One-day
  • carrier: USPS, UPS
  • transit: 3-8 Days
  • cost: $8.60
  • type: Calculated

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returns pneumativalv:

  • paid by: Buyer
  • time: 30 Days
  • policy: Returns Accepted
  • method: Money back
part type: flow control fitting tube,
category: business & industrial > hydraulics, pneumatics, pumps plumbing > pump flow controllers > pneumatic controllers, sku: 12178028760632602,
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1 offer $13.99 USD
  • Used. Offer #1 priced at $13.99 + $8.60 shipping estimate = $22.59* total. These services include Item is sold as pictured.+$8.60 shipping

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