No. 4 x 40 Thread Ring Gauge UNC NOGO, 2A, Hardened Gauge Steel ANSI/ASME B1.1/B1.2 - Metav IndustryLine

Take advantage of a precise, standards‑compliant inspection tool that combines hardened gauge steel durability with accurate UNC thread control; the ring’s No. 4‑40 geometry and tolerance class 2A ensure reliable pass/fail decisions on the shop floor. Order the gauge via Metav Werkzeuge or consult our specialists for application advice.

UNC NOGO thread ring gauge No. 4‑40, ANSI/ASME B1.1 — Metav IndustryLine

A UNC NOGO thread ring gauge No. 4 x 40 ANSI/ASME B1.1 / 2A designed to check external UNC threads quickly and unambiguously in production and incoming inspection environments

• NOGO thread ring for UNC No.4‑40
• Manufactured from hardened gauge steel
• Conforms to ANSI/ASME B1.1/B1.2 standards
• Tolerance class 2A for external thread checks

Fast, unambiguous pass/fail inspection for UNC threads

A NOGO thread ring is a dedicated inspection tool that prevents oversize external threads from passing quality control. Fitted to the No. 4‑40 profile and produced to ANSI/ASME B1.1/B1.2, this ring provides a clear binary result: the ring must not fully engage when the part is within the maximum material condition. That simplicity speeds up routine checks on fasteners and turned components, reducing sorting time and avoiding subjective assessments on the workbench. The normative design and the tolerance class 2A permit reproducible decisions that integrate directly into documented inspection plans.

Durable construction for long service life under repeated use

Made from hardened gauge steel, the ring is engineered to withstand frequent thread engagements without rapid wear, preserving gauge limits and measurement integrity. The hardened material reduces the rate of surface abrasion and keeps functional dimensions stable over many cycles, which lowers the need for early replacement and supports continuous production. For workshops seeking consistent results with minimal downtime, the robust construction translates into lower total cost of ownership and predictable inspection intervals.

Clear conformity and traceability for quality systems

Produced to the established ANSI/ASME B1.1 standard, this inspection ring supports formal quality assurance workflows and audit trails. The standardised geometry means inspection outcomes are comparable across suppliers and suppliers’ parts lists, aiding supplier qualification and incoming goods verification. Where traceability is required, the ring’s specification and marking allow direct linking of inspection results to procurement records, strengthening the documentation needed for ISO‑based quality systems and internal audits.

Contact Metav Werkzeuge for tailored application guidance and secure a Metav IndustryLine UNC NOGO ring gauge for reliable thread verification on your assemblies

Technical data

• Article number: M315.974
• GTIN: 4054469180663
• Description: UNC NOGO thread ring gauge No. 4 x 40
• Material: Lehrenstahl, gehärtet
• Standard: ANSI/ASME B1.1/B1.2
• Tolerance class: 2A
• Manufacturer: Metav IndustryLine

Facts

• Threads per inch: 40
• Size designation: No. 4
• Weight: 0.1 kg
• Customs tariff number: 90173000

Special features

• NOGO function for external thread checks
• Hardened gauge steel construction
• Conforms to ANSI/ASME B1.1/B1.2
• Tolerance class 2A for repeatable pass/fail decisions

FAQ

What is the primary purpose of this ring gauge? The UNC NOGO thread ring gauge No. 4 x 40 is used to verify that external UNC threads do not exceed the maximum material limits; a correct part must not accept the NOGO ring beyond the specified engagement.

Which standard does the gauge comply with? This ring gauge is manufactured to ANSI/ASME B1.1/B1.2 standards, ensuring uniform geometry and consistent inspection results for UNC threads.

What material is the gauge made from and why does it matter? The gauge is made from hardened gauge steel, which provides wear resistance and dimensional stability so that inspection limits remain reliable during prolonged shop‑floor use.

How does tolerance class 2A affect inspections? Tolerance class 2A indicates the external thread tolerance grade applicable to this ring; it defines the acceptance boundary for standard UNC external threads during pass/fail checks.

Is this gauge suitable for routine production checks? Yes, the robust construction and normative geometry make the ring suitable for regular production and incoming inspection tasks where rapid, unambiguous results are required.

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