7/8" x 20 UNEF Thread Go/No-Go Ring, Right-Hand, Hardened Gauge Steel, ANSI B1.1 2A - Metav IndustryLine

Take advantage of a robust inspection routine with a hardened gauge-steel body and strict ANSI/ASME B1.1/B1.2 conformity for repeatable results; the NOGO function and 2A tolerance make it suitable for production and incoming-inspection tasks. Order the Thread ring gauge directly via Metav Werkzeuge or ask our consultants if needed.

Thread ring gauge UNEF NOGO, 7/8-20 — Metav IndustryLine

The Thread ring gauge UNEF NOGO, 7/8-20 ANSI B1.1 / 2A is a right-hand, NOGO inspection ring for rapid verification of external UNEF threads in workshop and production environments

• UNEF 7/8-20 NOGO ring gauge
• Tolerance class 2A for thread fit
• Hardened gauge-steel construction
• Compliant with ANSI/ASME B1.1/B1.2

Consistent conformity for routine inspection

The NOGO variant is designed to support standardised pass/fail procedures and thus reduces inspection ambiguity. With the 7/8-20 UNEF designation and 2A tolerance class, the gauge aligns with familiar thread specifications used across mechanical assembly and maintenance. Conformity to ANSI/ASME B1.1/B1.2 ensures compatibility with established engineering drawings and supplier checks, so inspection results feed directly into quality documentation and production control.

Practical use in production and incoming inspection

This ring is intended for quick verification within production lines and receiving departments, allowing teams to identify out-of-tolerance external threads without time‑consuming measurements. The NOGO ring provides an unambiguous control point in an inspection workflow: the presence or absence of fit under controlled conditions signals conformity to the defined limit. The compact, single‑purpose design supports high throughput sampling and reduces the need for repeated micrometrology for every part, streamlining quality assurance.

Durable construction and handling advantages

Manufactured from hardened gauge steel, the tool is built for repeated use in industrial environments; the material choice offers wear resistance and dimensional stability during routine handling. The ring’s mass and feel support steady engagement, improving repeatability where manual checks are used. Traceable labelling and a robust finish simplify inventory control and storage in workshop tool cabinets or inspection sets, contributing to reliable measurement practices over time.

For secure thread verification in production, request this Metav IndustryLine NOGO ring via Metav Werkzeuge — the Emmerich quality filter is available to advise on suitability and supply logistics.

Technical Data

• Article number: M315.988.EF
• GTIN: 4054469181028
• Label: Gewinde-Lehrring UNEF NOGO, 7/8 x 20 ANSI B1.1 / 2A
• Manufacturer: Metav IndustryLine

Facts

• Thread size: 7/8"
• Pitch: 20 tpi
• Tolerance class: 2A
• Weight: 0.4 kg
• Tariff number: 90173000

Special features

• Material: hardened gauge steel
• Function: NOGO ring gauge
• Thread direction: right-hand
• Standard: ANSI/ASME B1.1/B1.2
• eClass: 21170214

FAQ

What is the intended use of this NOGO ring gauge?
The Thread ring gauge UNEF NOGO, 7/8-20 ANSI B1.1 / 2A is intended for go/no‑go inspection routines to verify the no‑go limit of matching external threads during production and incoming inspection.

Does the gauge follow recognised standards?
Yes, the gauge is manufactured to the ANSI/ASME B1.1/B1.2 standard and is specified as a 2A tolerance class for the UNEF 7/8-20 thread form.

What material is used and how does it affect durability?
The ring is made from hardened gauge steel, chosen for wear resistance and dimensional stability under repeated use in workshop environments.

How is the pitch indicated and what does it mean?
The pitch is specified as 20 tpi (threads per inch); this indicates the thread density for the 7/8" UNEF thread and is part of the gauge’s defining dimensions.

Is this ring suitable for automated inspection fixtures?
The instrument is primarily a manual inspection ring, but its defined geometry and conformity to standards make it suitable as a reference element within automated jigs or fixtures where a simple pass/fail engagement is required.

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