No. 4 40 TPI UNC Go Thread Ring Gauge 2A, ANSI/ASME B1.1/B1.2 - Metav IndustryLine

Take advantage of a hardened gauge steel construction combined with strict ANSI/ASME B1.1 compliance and a clear 2A GO acceptance criterion for reliable production control; order the GO thread ring gauge directly via Metav Werkzeuge or ask our consultants if needed.

Thread ring gauge UNC GO No. 4‑40 by Metav IndustryLine — hardened gauge steel, ANSI/ASME B1.1 compliance

The Thread ring gauge UNC GO, No. 4 x 40 is a GO acceptance gauge for checking external UNC 4‑40 threads in workshop and inspection environments according to ANSI/ASME B1.1, ideal for repeatable pass/fail decisions on small threaded components

• Hardened gauge steel construction
• ANSI/ASME B1.1 compliant GO gauge
• Tolerance class 2A verification
• Compact No.4‑40 size, lightweight 0.1 kg

Consistent GO checking for small UNC threads

A GO thread ring is used to confirm that an external thread is manufactured within the allowed maximum material envelope; the supplied item is a GO gauge for UNC No.4‑40 (40 tpi) that provides a fast, binary check during production or incoming inspection. Because the ring is made from hardened gauge steel, it resists wear and keeps the acceptance limit stable over many cycles, which reduces the need for frequent recalibration and helps avoid false rejects. The design is especially suited to small fasteners and precision components where quick decision-making is essential to maintain throughput and reduce rework.

Built to standards for traceable inspection decisions

Compliance with ANSI/ASME B1.1 and the designation 2A ensures the ring corresponds to the specified external thread tolerance for UNC series threads; this offers a verifiable basis for quality records and supplier acceptance. The component’s light weight (0.1 kg) and compact form factor make it straightforward to handle at the inspection bench while the hardened material supports dimensional stability. Using a standardised GO gauge simplifies the documentation of acceptance criteria in quality plans and aligns inspection practice with common engineering specifications.

Practical integration into workshop and inspection routines

The ring gauge is intended for routine checks where a clear pass result is required before assembly or dispatch. Its compact size and single‑function GO nature mean the inspection step is quick and repeatable, supporting production flow without complex measuring setups. For traceability, record the SKU (M315.944) and GTIN when logging which gauge was used for a batch inspection. Where traceable calibration certificates or specific calibration regimes are required, Metav Werkzeuge can advise on calibration intervals and storage to preserve gauge accuracy.

Why hardened gauge steel matters for longevity

Hardened gauge steel provides a combination of surface hardness and core stability that keeps the functional thread profile consistent over time; wear is minimised on the critical flank and crest surfaces that determine pass/fail results. This material choice reduces measurement drift and helps maintain a reliable acceptance limit, which is particularly beneficial when checking high volumes of externally threaded parts or when performing repeated batch inspections.

For robust, standards‑based GO verification of UNC 4‑40 threads, request Metav IndustryLine’s GO thread ring (SKU M315.944) from Metav Werkzeuge GmbH in Emmerich or contact our consultants at info@metav-werkzeuge.com or +49 2822 7131930 for specific inspection guidance

Technical Data

• Article number: M315.944
• GTIN: 4054469180021
• Material: hardened gauge steel
• Standard: ANSI/ASME B1.1/B1.2
• Tolerance class: 2A

Facts

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

Special features

• GO ring gauge for external UNC threads
• Compact, lightweight design for bench inspection
• Hardened for improved wear resistance
• Intended for production and incoming inspection

FAQ

What does the GO designation mean for this ring gauge?
The GO designation indicates that the ring gauge (Thread ring gauge UNC GO, No. 4 x 40) is used to verify that an external thread is within the maximum material limit and will accept parts that meet the allowed external profile.

Is the gauge compliant with international standards?
Yes, the Metav IndustryLine GO thread ring conforms to ANSI/ASME B1.1 and is supplied to the tolerance class 2A for UNC threads.

Which thread size is covered by this gauge?
This GO ring checks external threads in the UNC No.4‑40 specification (No. 4, 40 threads per inch); refer to SKU M315.944 when recording gauge usage.

How should the gauge be used in a production environment?
Use the GO ring as a quick pass/fail check on prepared external threads; its hardened construction supports repeated checks and helps sustain consistent acceptance criteria across production batches.

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