7/8" UNC Thread Ring Gauge 9 TPI Go, Hardened Gage Steel, ANSI/ASME B1.1 2A - Metav IndustryLine

Take advantage of the combination of hardened gauge steel, ANSI/ASME conformity and a clear tolerance class 2A for dependable thread acceptance; order the gauge via Metav Werkzeuge or consult our specialists for application advice.

Gewinde-Lehrring UNC GO, 7/8 x 9 ANSI B1.1 / 2A — Metav IndustryLine thread ring gauge, hardened gauge steel, ANSI standard

the Gewinde-Lehrring UNC GO, 7/8 x 9 ANSI B1.1 / 2A is a GO ring gauge for validation of external UNC threads in production and inspection environments

• Hardened gauge steel construction
• ANSI/ASME B1.1 compliance for UNC threads
• Tolerance class 2A for acceptance checks
• Compact 7/8" size for 7/8-9 UNC threads

Consistent acceptance testing for UNC external threads

Manufactured as a GO ring gauge, this tool provides a reliable, quick check that the external thread meets the specified form and major diameter limits. Made from hardened gauge steel, the gauge resists wear and preserves the acceptance limit over repeated cycles, which reduces rework and rejects in routine inspection. Conformity to ANSI/ASME B1.1 ensures compatibility with international UNC specifications, so production parts stamped against this gauge can be validated against a recognised standard.

Built for repeatability and straightforward inspection

The ring design offers tactile and visual confirmation of a pass condition: if the ring fits the shaft without force, the thread is within the permitted envelope for a 2A external class. The nominal 7/8" x 9 tpi designation and the specified tolerance class 2A simplify documentation and traceability in quality records. As a compact, rigid instrument with a modest mass, the gauge is straightforward to handle on the shop floor and lends itself to repetitive checks without operator fatigue, supporting stable process capability.

Practical benefits for workshop and quality departments

For machine shops, component manufacturers and incoming inspection, the gauge functions as a fast go/no-go reference that supports throughput and decision-making. Using a dedicated GO ring gauge avoids time-consuming measurement routines for each part and helps maintain production flow by enabling immediate acceptance of compliant threads. The item’s compact footprint and robust material finish make it suitable for routine shop-floor use while retaining the precision demanded by engineered fastener systems.

For dependable thread validation, request the Metav IndustryLine M315.958 from Metav Werkzeuge in Emmerich or speak with our technical team at info@metav-werkzeuge.com or +49 2822 7131930

Technical data

• Article number: M315.958
• GTIN: 4054469180373
• Label: Gewinde-Lehrring UNC GO, 7/8 x 9 ANSI B1.1 / 2A

Core specifications

• Thread size: 7/8" x 9 tpi
• Standard: ANSI/ASME B1.1/B1.2
• Tolerance class: 2A
• Mass: 0.4 kg
• Pitch: 9 tpi

Materials & features

• Material: Gauge steel, hardened
• Type: GO thread ring gauge
• Categories: Gauges; Gauge pins

FAQ

What is the purpose of the Gewinde-Lehrring UNC GO, 7/8 x 9 ANSI B1.1 / 2A?
The Gewinde-Lehrring UNC GO, 7/8 x 9 ANSI B1.1 / 2A serves as a GO acceptance gauge for external UNC threads, confirming that parts meet the 2A external tolerance for immediate approval in production.

Which threads does this ring gauge check?
This ring gauge is designed for 7/8" x 9 tpi UNC external threads produced to ANSI/ASME B1.1 and is intended for go/no-go acceptance testing as a GO gauge.

How does the tolerance class 2A affect inspection?
Tolerance class 2A defines the acceptance envelope for external threads; the Gewinde-Lehrring GO checks that the thread fits within that envelope, providing a rapid pass criterion for quality control.

Is the gauge suitable for repetitive shop-floor use?
Yes, constructed from hardened gauge steel, the ring gauge is robust for frequent checks and preserves the GO limit over many inspection cycles.

Can the Gewinde-Lehrring be used as a traceable inspection standard?
When recorded in inspection logs, the Gewinde-Lehrring UNC GO, 7/8 x 9 ANSI B1.1 / 2A provides a repeatable reference for in-process and final checks and supports traceability in production records.

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