1/2" 28 TPI UNEF Thread Go/No-Go Ring NOGO, Right-Hand, Hardened Gauge Steel, ANSI/ASME B1.1/B1.2 - Metav IndustryLine

Take advantage of a hardened gauge-steel construction and ANSI/ASME conformity to maintain reliable thread quality control; the combination of precise 2A tolerance and a 28 tpi UNEF form reduces the risk of oversized threads and downstream rework. Order the gauge directly via Metav Werkzeuge or contact our consultants for specification advice and rapid fulfilment.

Gewinde-Lehrring UNEF NOGO, 1/2 x 28 ANSI B1.1 / 2A — NOGO thread ring gauge, hardened gauge steel (Metav IndustryLine)

The Gewinde-Lehrring UNEF NOGO, 1/2 x 28 ANSI B1.1 / 2A is a NOGO thread ring gauge designed for quick pass/fail inspection of UNEF 1/2‑28 right‑hand threads in production and incoming inspection, compliant with ANSI/ASME standards

• NOGO-only control for UNEF 1/2‑28 threads
• Hardened gauge steel for long service life
• Conforms to ANSI/ASME B1.1/B1.2 standards
• Tolerance class 2A for industrial thread limits

Rapid assurance of thread conformity for production lines

A dedicated NOGO ring provides the fastest, most reliable check against oversized or out‑of‑limit threads. Manufactured from hardened gauge steel, this ring is engineered to preserve measuring edges and resist wear in a workshop environment, ensuring consistent thread inspection over many cycles. Conformity to ANSI/ASME B1.1 and B1.2 and the specified 2A tolerance class supplies a verifiable reference for limit testing, allowing process engineers to separate usable parts from rejects without time‑consuming measurements. The simple pass/fail principle supports rapid in‑line checks and reduces the throughput bottlenecks that otherwise lead to extended cycle times and additional machining.

How the gauge integrates into quality workflows

The ring is intended for a clear pass/fail application: the thread passes if the NOGO does not engage and fails if the NOGO screws in. Designed for routine use on the shop floor, the compact nominal size of UNEF 1/2‑28 and a mass of approximately 0.2 kg make the gauge easy to handle and store on inspection benches. The right‑hand thread construction and 28 tpi pitch match common UNEF components, simplifying operator training and standard operating procedures. Because the gauge directly enforces the maximum material condition, it prevents acceptance of oversized threads that can cause assembly issues, leaks or premature failure — a practical contribution to overall equipment efficiency.

Proven standardisation and traceable identification for inspection records

Compliance with recognised standards and a robust build provide confidence for auditors and quality departments alike. The gauge carries a unique SKU and GTIN for inventory and traceability, facilitating document control and procurement. Where documentation is required for internal audits, procurement or supplier contracts, the adherence to ANSI/ASME thread limits and the defined 2A tolerance class serve as objective references. Combined with Metav’s role as a precision partner, this component contributes to a predictable supply chain: reliable stock, transparent order processing and the ability to integrate the gauge into a wider inspection regime that supports consistent product quality.

For assured thread conformity and specification guidance, contact Metav Werkzeuge (info@metav-werkzeuge.com, +49 2822 7131930) to request the NOGO UNEF 1/2‑28 ring and advice on integrating it into production inspection routines

Technical data

• Article number: M315.984.EF
• GTIN: 4054469180908
• Description: Gewinde-Lehrring UNEF NOGO, 1/2 x 28 ANSI B1.1 / 2A
• Material: Gauge steel, hardened
• Standard: ANSI/ASME B1.1/B1.2
• Thread direction: Right-hand

Core specifications

• Weight: 0.2 kg
• Thread pitch: 28 tpi
• Nominal size: 1/2"
• Tolerance class: 2A
• Tariff number: 90173000

Special features

• NOGO ring for UNEF thread form
• Hardened gauge steel construction
• Conforms to ANSI/ASME for thread limit gauges
• Right-hand thread
• SKU: M315.984.EF

FAQ

What is the purpose of a NOGO ring?
A NOGO ring is used for quick verification of maximum material limits; the NOGO ring must not engage if the thread is within tolerance, and the NOGO ring will engage on oversized threads indicating rejection. The Gewinde‑Lehrring UNEF NOGO, 1/2 x 28 ANSI B1.1 / 2A fulfils this role for UNEF 1/2‑28 threads.

Which standard does this thread gauge follow?
The ring is manufactured to the ANSI/ASME B1.1/B1.2 thread limits and uses the 2A tolerance class specified for external threads, ensuring compatibility with US standard UNEF components.

Can this gauge be used for left‑hand threads?
No, this NOGO ring is designed for right‑hand threads only; its geometry and helix direction match standard right‑hand UNEF threads.

How should a failed check be interpreted on the shop floor?
If the NOGO ring screws in or seats fully, the thread exceeds the permitted maximum material condition and the part should be rejected or reworked according to the quality procedure; the Gewinde‑Lehrring UNEF NOGO, 1/2 x 28 ANSI B1.1 / 2A provides a clear physical limit for this decision.

Is the gauge suitable for use in production and incoming inspection?
Yes, the hardened construction and standard conformity make it suitable for both production in‑process checks and incoming inspection of threaded components.

Metav IndustryLine: Manufacturer / Responsible: Metav Werkzeuge GmbH; Parkring 45; 46446 Emmerich; Germany; +49 2822 7131930; info@metav-werkzeuge.com