1/2" 20 TPI Thread Ring Gauge UNF Go, Right-Hand, Hardened Gauge Steel, ANSI/ASME B1.1 2A - Metav IndustryLine

Precise pass/fail inspection for UNF threads, achieved through a hardened gauge steel GO ring built to ANSI/ASME B1.1 standards; use this tool to reduce rework and ensure interchangeability on right-hand threads. Order the thread gauge directly via Metav Werkzeuge or consult their specialists for application advice.

Thread ring gauge UNF GO, 1/2 x 20 (ANSI/ASME B1.1 / 2A) — Metav IndustryLine

A Thread ring gauge UNF GO, 1/2 x 20 (ANSI/ASME B1.1 / 2A) for fast verification of right-hand UNF threads in production and quality-control environments

• ANSI/ASME B1.1/B1.2 compliant
• Hardened gauge steel construction
• UNF GO ring for 1/2 x 20 threads
• Tolerance class 2A for precision fit

Consistent pass/fail checks that save production time

A GO ring offers a rapid, unambiguous assessment of whether a threaded part meets the required major-diameter and pitch form limits. Fitted as a GO ring, the device confirms acceptance to 1/2 x 20 UNF specification without the need for time-consuming measurements; accepted parts can pass straight to assembly, rejected parts are identified immediately. The clear GO/NO‑GO principle reduces inspection time and lowers downstream rework rates, improving throughput in repetitive inspection tasks.

Built for repeatability on the shop floor

Manufactured from hardened gauge steel, this gauge resists wear and maintains geometry over extended use, which preserves measurement reliability across batches. Robust construction minimises the need for frequent replacement and supports consistent fit checks throughout production runs. The combination of a wear-resistant material and straightforward GO-design translates into dependable, low-maintenance inspection tooling for both small series and continuous manufacturing.

Conforms to established standards for interchangeability

Designed to the ANSI/ASME B1.1/B1.2 thread standards and specified as tolerance class 2A, the ring supports consistent acceptance criteria across suppliers and production stages. Compliance with these recognised norms ensures that parts verified with this gauge will mate reliably with corresponding internal threads made to the same standard. Traceable, standardised inspection practice simplifies supplier audits and helps uphold assembly quality across mixed-source components.

Simple integration into existing quality routines

The gauge’s single-purpose geometry makes it straightforward to include in production lines, inspection benches or incoming‑goods checks. The right-hand thread configuration and GO-only design keep the inspection step focused and repeatable: pass if it fits, otherwise stop and inspect. This simplicity benefits both experienced quality engineers and workshop staff, enabling quick decision-making and a clearer separation between conforming and non-conforming parts.

For assured thread verification from Metav IndustryLine, request application guidance or place an order through Metav Werkzeuge—call +49 2822 7131930 or email info@metav-werkzeuge.com

Technical data

• Article number: M315.954.F

• Name: Thread ring gauge UNF GO, 1/2 x 20 ANSI B1.1 / 2A

• GTIN: 4054469180274

• Nominal size: 1/2"

• Threads per inch: 20

• Weight: 0.2 kg

• Tolerance class: 2A

• Material: gauge steel, hardened

• Thread direction: right-hand thread

• Standard: ANSI/ASME B1.1/B1.2

• Type: GO ring gauge

FAQ

What does "GO" signify for this ring gauge?
The GO designation means the ring gauge verifies that the external thread falls within the maximum material limits for acceptance; the Thread ring gauge UNF GO, 1/2 x 20 (ANSI/ASME B1.1 / 2A) accepts parts that meet the nominal tolerance for assembly.

Is this gauge suitable for production inspection of fine UNF threads?
Yes. The gauge is specified for 1/2 x 20 UNF threads and, as a GO ring in tolerance class 2A, is intended for rapid production‑level acceptance checks and incoming inspection.

How does the material affect long-term use?
Constructed from hardened gauge steel, the ring is designed for wear resistance and dimensional stability, which supports repeatable inspections over many cycles.

What does tolerance class 2A mean in practice?
Tolerance class 2A denotes the external thread tolerance band defined by ANSI/ASME for general commercial use; the GO ring confirms that the external thread fits within this specified band for interchangeability.

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