1/4" 20 TPI UNC Nogo Thread Gauge, Hardened Steel, ANSI/ASME B1.1/B1.2 - Metav IndustryLine

Take advantage of precise, standards‑compliant thread inspection with a hardened gauge‑steel NOGO ring and verified ANSI/ASME conformity; this compact control tool minimises false acceptance and supports repeatable quality control at the production line. Order the gauge directly via Metav Werkzeuge or contact their specialists for application advice.

Gewinde-Lehrring UNC NOGO, 1/4 x 20 ANSI B1.1 / 2A — NOGO thread ring, hardened gauge steel, ANSI/ASME compliant

The Gewinde-Lehrring UNC NOGO, 1/4 x 20 ANSI B1.1 / 2A is a dedicated NOGO thread ring intended for fast pass/fail inspection of 1/4‑20 UNC external threads in mechanical production and assembly processes

• ANSI/ASME B1.1/B1.2 compliance
• Hardened gauge steel construction
• NOGO ring for quick pass/fail inspection

Rapid, reliable thread control for consistent production quality

The NOGO ring serves as a simple, time‑efficient inspection device that determines whether an external thread falls outside permitted limits. By confirming rejection of out‑of‑tolerance threads without micrometres or visual interpretation, the gauge reduces cycle time at incoming inspection and on the shop floor. Constructed for repetitive use, the tool supports a lean quality workflow, enabling operators to focus on corrective action rather than measurement debate.

Conformity and tolerance explained for traceable inspections

Built to ANSI/ASME B1.1/B1.2, the ring enforces the dimensional limits associated with UNC 1/4‑20 thread geometry; the 2A tolerance denotes the external thread class and defines the acceptance envelope for major, minor and pitch diameters. Using a NOGO ring complements dimensional sampling by providing unequivocal Go/No‑Go evidence: if the ring does not screw on, the thread is within acceptable maximum material condition limits and can proceed to the next operation. This approach simplifies decision‑making in production and audit situations.

Durable construction for long service life and low maintenance

Made from hardened gauge steel, the ring resists wear and maintains form accuracy under frequent use, which prolongs service life and reduces the need for replacement gauges. The compact, robust design is suitable for inspection benches and portable control sets alike; its small mass and form factor enable quick handling during assembly checks. When stored and handled correctly, the gauge delivers consistent, repeatable results that protect against assembly failures and downstream rework.

For assured thread inspection and application guidance for the Metav IndustryLine NOGO ring, contact Metav Werkzeuge in Emmerich—call +49 2822 7131930 or email info@metav-werkzeuge.com to confirm suitability and delivery options

Technical data

• SKU: M315.980
• GTIN: 4054469180793
• Label: Gewinde-Lehrring UNC NOGO, 1/4 x 20 ANSI B1.1 / 2A

Facts

• Weight: 0.1 kg
• Thread size: 1/4"
• Pitch: 20 tpi
• Tolerance class: 2A

Special features

• Material: hardened gauge steel
• Standard: ANSI/ASME B1.1/B1.2
• Type: NOGO thread ring
• Category: Gauges / Lehren
• Manufacturer brand: Metav IndustryLine

FAQ

What is the primary purpose of this NOGO ring?
The Gewinde-Lehrring UNC NOGO, 1/4 x 20 ANSI B1.1 / 2A is designed for fast pass/fail checks of 1/4‑20 UNC external threads to prevent out‑of‑tolerance parts entering assembly.

What does the 2A tolerance class indicate?
The 2A designation describes the external thread tolerance class under the ANSI/ASME system and defines the acceptable dimensional envelope for external UNC threads when using this gauge.

Which standard governs the thread form for this gauge?
This gauge is manufactured to the ANSI/ASME B1.1/B1.2 standard, matching the geometry and limits used for UNC 1/4‑20 threads.

How durable is the gauge in regular production use?
Constructed from hardened gauge steel, the ring offers high wear resistance and maintains dimensional stability under frequent use, supporting reliable pass/fail inspection over time.

Can this NOGO ring be used for final assembly checks?
Yes, the ring is suitable for shop‑floor and assembly‑line control to ensure external threads do not exceed permitted material conditions prior to mating operations.

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