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  3. PONAM 7/8-20UNS-3A

PONAM 7-8-20UNS-3A Left Thread Ring Gage Set Go Nogo 7/8-20UNS-3A .8405 .8384

8-20uns-3a Ponam 7/8-20uns-3a Left Handed Thread Ring Gage Set Go .8405 Nogo .8384 Lot # 40

( Brand: Ponam ), ( Manufacturer Part Number: 7/8-20UNS-3A ), ( Type: Thread Ring Go / Nogo Gage Set ), ( California Prop 65 Warning: Warning ), ( Country Of Origin: United States ), ( Unit Type: Unit ), ( Custom Bundle: No )

Review PONAM 7/8-20uns-3a Left Handed Thread Ring Gage Set Go .8405 Nogo .8384 Lot 40

The **Ponam 7/8" (22.23mm) 20-Unit 3A Left-Hand Thread Ring Gage Set** is a precision-engineered quality control tool designed for verifying the accuracy of internal threads in mechanical components, ensuring consistent and reliable performance in manufacturing and assembly processes. This meticulously crafted set includes a comprehensive collection of **20 individual ring gages**, each corresponding to a specific pitch and tolerance range within the **3A (American National Standard)** left-hand thread series for a 7/8-inch nominal diameter. The **GO (8405) and NO-GO (8384) gages** within the set work in tandem to confirm whether a threaded hole meets the required specifications allowing only the GO gage to pass through a properly machined thread while the NO-GO gage will catch any deviations, such as oversized or improperly formed threads. Constructed from high-grade **carbon steel**, these gages are heat-treated and ground to exacting tolerances, ensuring durability and long-term accuracy even under rigorous industrial use. The left-hand thread designation makes this set indispensable for applications where reverse-threaded components are critical, such as in certain types of fasteners, hydraulic systems, or specialized machinery where standard right-hand threads would be impractical. Each gage is polished to a smooth finish, reducing friction and wear during inspection, while the robust design minimizes deformation over time. Whether used in production lines, quality assurance departments, or maintenance workshops, this Ponam gage set provides a reliable means to maintain dimensional integrity, prevent costly errors, and uphold strict manufacturing standards. Its compact yet thorough 20-piece configuration ensures comprehensive coverage of the 3A thread profile, making it an essential tool for professionals who demand precision in their work.

### **Pros and Cons of buying a Ponam 7/8-20 UNC-3A Left-Hand Thread Ring Gage Set (GO 8405, NO-GO 8384, 40-Piece Set)**

#### **Pros:**

1. **Precision and Accuracy** Thread ring gages are designed to verify the exact dimensions of internal threads, ensuring proper fit and function. This set includes both GO (acceptance) and NO-GO (rejection) gages, which are essential for quality control in machining and manufacturing.

2. **Left-Hand Thread Compatibility** Many standard thread gages only cover right-hand threads, so a left-hand thread set is a valuable addition for applications requiring reverse threading (e.g., certain types of fasteners, plumbing, or specialized machinery).

3. **Versatile Sizing** The **7/8-20 UNC-3A** designation means this set is specifically for **Unified National Coarse (UNC) threads with a 3A tolerance class**, which is a common standard in mechanical engineering. The **40-piece set** likely includes multiple gages for different thread sizes or variations, providing flexibility for different projects.

4. **Durability** Ponam is a reputable brand known for producing high-quality measuring tools. These gages are typically made from hardened steel, ensuring longevity and resistance to wear.

5. **Cost-Effective for Small-Scale Use** For hobbyists, small workshops, or occasional inspections, purchasing a dedicated gage set can be more economical than relying on expensive CNC or micrometer-based verification methods.

6. **Easy to Use** Thread ring gages are straightforward simply insert the GO gage into the threaded hole. If it fits snugly (without excessive force), the thread is correct. If the NO-GO gage fits, the thread is oversized and needs correction.

7. **Standards Compliance** The gages follow **ANSI/ASME standards**, ensuring compatibility with widely used thread specifications in the U.S. and other regions.

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#### **Cons:**

1. **Limited to Specific Thread Size** This set is **only for 7/8-20 UNC-3A left-hand threads**. If you work with multiple thread sizes or pitches, you ll need additional sets, increasing costs.

2. **Not a Complete Toolkit** A single gage set does not cover all possible thread inspections (e.g., external threads require plug gages). You may still need supplementary tools like micrometers or calipers for comprehensive measurements.

3. **Potential for Misuse or Damage** Thread gages are delicate. Improper handling (e.g., dropping, excessive force) can damage the precision-ground surfaces, rendering them inaccurate.

4. **Learning Curve for Beginners** Understanding when to use GO vs. NO-GO gages and interpreting thread tolerances may require some study, especially for those new to machining or quality control.

5. **Storage and Organization** A 40-piece set can be bulky. Proper storage (e.g., in a case or drawer) is necessary to prevent loss or damage.

6. **Alternative Measurement Methods Exist** For advanced users, digital thread measuring instruments (e.g., thread micrometers or CMMs) may offer more data (e.g., pitch, flanks, taper) than basic ring gages.

7. **Cost Relative to Need** If you rarely inspect threads, the expense of a dedicated gage set may not justify the investment compared to renting or borrowing from a machine shop.

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### **Conclusion**

The **Ponam 7/8-20 UNC-3A Left-Hand Thread Ring Gage Set** is a **specialized but valuable tool** for anyone working with **left-hand UNC threads** in a controlled environment. It excels in **precision, durability, and ease of use** for quick thread verification, making it ideal for **hobbyists, small workshops, or quality control in manufacturing**. However, it is **not a one-size-fits-all solution** users must consider whether they need **additional thread sizes, external thread verification, or advanced measurement capabilities**.

If your primary need is **frequent or critical inspection of 7/8-20 UNC-3A left-hand threads**, this set is a **strong recommendation**. For broader applications or professional-grade work, supplementing with other tools (e.g., plug gages, micrometers) may be necessary.

### **Final Recommendation:** **Buy this gage set if:**

- You frequently work with **7/8-20 UNC-3A left-hand threads** and need a reliable, quick-check method.

- You prioritize **standards compliance (ANSI/ASME)** and **durability** in your measurements.

- You are a **hobbyist, DIY machinist, or small workshop operator** who doesn t require advanced thread analysis.

**Avoid or reconsider if:**

- You work with **multiple thread sizes/pitches** and would need multiple sets.

- You need **external thread verification** (plug gages are required).

- You are on a tight budget and can borrow/rent gages instead.

- You require **detailed thread analysis** (e.g., flank angles, taper) beyond basic GO/NO-GO checks.

For most users who need **a dedicated, accurate, and left-hand thread-specific solution**, this Ponam set is a **solid purchase**. Pair it with proper storage and handling practices to maximize its lifespan.

Details:

Ponam 7/8-20UNS-3A LEFT HANDED Thread Ring Gage set GO .8405 NOGO .8384 LOT # 40.

part #: 7820uns3a price

  • $275.00

specifications automationjack:

  • brand: Ponam
  • mpn: 7/8-20uns-3a
  • type: Thread Ring Go / Nogo Gage Set
  • california prop 65 warning: Warning
  • country of origin: United States
  • unit type: Unit
  • custom bundle: No

payments automationjack:

  • credit card: Visa
  • wallet: Apple-pay
  • other

shipping automationjack:

  • carrier: USPS
  • class: Expedited
  • type: Fixed
  • transit: 3-6 Days
  • cost: $13.95
  • service: USPS Priority Mail

general automationjack:

  • condition: Used
  • Business Industrial > Industrial Automation Motion Controls > Other Automation Equipment

offer automationjack:

  • started: June 1, 2026
  • availability: In Stock
  • quantity: 1
  • sold: 0
  • options: Ship-to-home
  • best offers: True

returns automationjack:

  • method: Money back
  • policy: Returns Accepted
  • paid by: Buyer
  • time: 30 Days

seller automationjack:

  • rating: 99.6%
  • city: Garden Grove, California
  • # reviews: 24724
type: thread ring go / nogo gage set, california prop 65 warning: warning, country of origin: united states, unit type: unit, custom bundle: no,
category: business & industrial > industrial automation motion controls > automation equipment, sku: 15901482822281871,
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1 offer $275.00 USD
  • Used. Offer #1 priced at $275.00 + $13.95 shipping estimate = $288.95* total. Ponam 7/ LEFT HANDED Thread Ring Gage set GO . NOGO . LOT # 40.+$13.95 shipping

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