TAGCO 4.000-16UNJ Thread Gage Set Plug Lh Gopd 3A 3.9594
( Brand: Tagco ), ( Manufacturer Part Number: 4.000-16UNJ ), ( Model: 4.000-16UNJ 3A LH ), ( Part Type: Plug )
Review TAGCO Thread Gage Set Plug 3a Lh Gopd
The **Tagco 4.000 16 UNJ Thread Gage Set (Plug Gages, 3A LH, GOPD 3.9594)** is a precision-engineered toolset designed for the meticulous inspection and verification of internal and external threads in critical mechanical applications. This high-accuracy gage set is tailored specifically for **UNJ (Unified National Jet) threads**, a specialized form of tapered thread commonly used in aerospace, automotive, and industrial machinery where tight tolerances and reliable sealing are paramount. The **4.000 16 UNJ range** covers a broad spectrum of thread sizes, ensuring compatibility with a variety of fasteners, including bolts, studs, and threaded components where precise alignment and sealing integrity are essential. Each gage in the set is crafted from **high-grade alloy steel**, heat-treated to achieve exceptional hardness and durability, while the **3A (Grade 3A) finish** ensures a smooth, wear-resistant surface that minimizes friction and extends the gage s operational lifespan.
This set includes **plug gages**, which are designed to be inserted into pre-threaded holes to verify the accuracy of internal threads, confirming that they meet the specified pitch, depth, and taper. The **LH (Left-Hand) designation** indicates that these gages are engineered for left-handed threads, a critical feature in applications where standard right-handed tools would be ineffective, such as certain types of mechanical linkages, marine hardware, or specialized aerospace components. The **GOPD (Go/Not-Go Plug) configuration** provides a dual-functionality approach, allowing operators to quickly and efficiently determine whether a thread is within tolerance accepting (Go) or rejecting (Not-Go) the component in a single pass. The **3.9594** designation likely refers to a specific gage number or a unique identifier within the set, ensuring traceability and consistency in quality control processes.
Beyond its technical specifications, this gage set is built to withstand the rigors of industrial environments, offering resistance to corrosion, wear, and dimensional drift over prolonged use. The precision-machined design ensures that each gage maintains its accuracy even under repeated inspections, making it an indispensable tool for quality assurance teams in manufacturing facilities. Whether used in a production line, maintenance workshop, or calibration laboratory, the **Tagco 4.000 16 UNJ Thread Gage Set** delivers the reliability and precision required to uphold stringent industry standards, ensuring that threaded components perform flawlessly in high-stakes applications. Its robust construction and specialized design make it a cornerstone of thread verification, bridging the gap between manual inspection and automated quality control.
### **Pros and Cons of buying a TAGCO 4.000-16 UNJ Thread Gage Set (Plug Gages, 3A LH, GOPD 3.9594)**
#### **Pros:**1. **Precision and Accuracy** TAGCO is a well-known manufacturer of high-quality thread gages, ensuring precise measurements for critical applications. The 3A (Grade A) designation indicates superior accuracy, making it suitable for production, quality control, or precision machining.
2. **Durability and Build Quality** The set is constructed from hardened steel, which resists wear and deformation over time. The 3.9594 GOPD (Grade of Precision) rating suggests it meets strict industrial standards, ensuring long-term reliability.
3. **Versatility for UNJ Threads** The set covers a range of **4.000 to 16 UNJ threads**, which are commonly used in automotive, aerospace, and hydraulic applications. UNJ threads (with a radius at the root) are critical in high-stress environments, so having accurate gages is essential.
4. **Left-Hand (LH) Thread Compatibility** Many mechanical systems require left-hand threads (e.g., in some automotive components, pumps, or specialized machinery). This set includes LH gages, expanding its usability.
5. **Plug Gages for Internal Verification** Plug gages are ideal for checking internal threads (e.g., in tapped holes). They provide a direct, tactile method to verify thread dimensions, which is more reliable than some other measurement methods.
6. **Compatibility with TAGCO s Ecosystem** If you already use TAGCO gages or tools, this set integrates seamlessly with their measurement systems, reducing the need for multiple brands.
7. **Industrial-Grade Calibration** The 3.9594 GOPD rating indicates it has been calibrated to a high standard, which is crucial for maintaining consistency in manufacturing processes.
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#### **Cons:**1. **High Initial Cost** Compared to basic thread gages, this set is an investment. The premium grade (3A) and specialized UNJ threads increase the price, which may be prohibitive for small workshops or hobbyists.
2. **Limited Range (4.000-16 UNJ)** If your applications require threads outside this range (e.g., smaller or larger diameters), you ll need additional sets, increasing costs.
3. **Specialized Knowledge Required** UNJ threads are not as common as standard UNC/UNF threads, so operators may need training to use these gages correctly. Misinterpretation could lead to incorrect measurements.
4. **Storage and Organization Needs** A comprehensive thread gage set requires proper storage to prevent damage or loss. The plug gages must be kept clean and protected from moisture or debris.
5. **Potential for Wear Over Time** While durable, frequent use in harsh environments (e.g., high-temperature applications) could eventually affect accuracy. Regular recalibration may be necessary.
6. **Not Ideal for Quick Field Checks** Unlike ring gages (which can be used for quick visual checks), plug gages require insertion into a threaded hole, making them less convenient for on-the-spot inspections.
7. **Maintenance Requirements** Hardened steel gages must be handled carefully to avoid chipping or bending. They should be stored in a dry environment and periodically inspected for wear.
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### **Conclusion:**The **TAGCO 4.000-16 UNJ Thread Gage Set (Plug Gages, 3A LH, GOPD 3.9594)** is a **high-quality, precision tool** designed for professional use in industries where thread accuracy is critical. Its strengths lie in **durability, precision, and compatibility with specialized UNJ threads**, making it ideal for manufacturing, quality control, or aerospace applications. However, its **high cost, specialized nature, and maintenance needs** may not justify the purchase for casual users, hobbyists, or those working with standard threads.
If you frequently work with **UNJ threads in demanding environments** and require **industrial-grade accuracy**, this set is a **strong recommendation**. For general-purpose or budget-conscious users, a lower-grade or more basic thread gage set may suffice.
### **Recommendation:**- **Buy if:** You work in **automotive, aerospace, or hydraulic systems** where UNJ threads are standard, and you need **high-precision measurements** for quality control or production.
- **Consider alternatives if:** You only occasionally work with threads, need a broader range of sizes, or are on a tight budget. In such cases, a **basic UNJ thread ring gage set** or a **multi-range plug gage set** might be more practical.
- **Pair with:** A **thread micrometer or caliper** for additional verification, and store in a **protected case** to extend the gages lifespan.
Details:
Return item must be insured to value of purchase. TAGCO THREAD GAGE SET PLUG 4.000-16UNJ 3A LH W GOPD 3.9594. FOB our dock. 30 day return for DOA.
All claims for shipping damage must be made with the carrier.
part #: 400016unj price
- $325.00
specifications linactuat:
- brand: Tagco
- mpn: 4.000-16unj
- model: 4.000-16unj 3a Lh
- part type: Plug
shipping linactuat:
- transit: 3-9 Days
- carrier: UPS, USPS
- service: UPS Ground, UPS Next Day Air, USPS Priority Mail, USPS Priority Mail Small Flat Rate Box
- cost: $19.38
- type: Calculated
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returns linactuat:
- time: 30 Days
- method: Money back
- policy: Returns Accepted
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seller linactuat:
- city: Buffalo, New York
- # reviews: 2391
- rating: 100.0%
general linactuat:
- condition: Used
- Industrial Automation Motion Controls > Rotary Linear Motion > Linear Encoders
offer linactuat:
- started: April 28, 2026
- sold: 0
- availability: In Stock
- options: Ship-to-home
- quantity: 1
