5/16" UNC Thread Plug Gauge 5/16 x 18 ANSI B1.1 2B - Metav IndustryLine

Take advantage of a hardened gauge-steel construction and strict ANSI/ASME B1.1 conformity for reliable thread inspection in production; order the thread plug gauge directly via Metav Werkzeuge or ask our consultants if needed.

Thread plug gauge UNC, 5/16 x 18 ANSI/ASME B1.1 / 2B (Metav IndustryLine)

A thread plug gauge designed for fast, standards-based verification of 5/16‑18 UNC internal threads in workshop and production settings

• ANSI/ASME B1.1 compliant inspection tool
• Hardened gauge steel for long service life
• Tolerance class 2B for internal threads
• Size 5/16‑18 UNC, 18 TPI

Ensure consistent, measurable thread quality on the line

The combination of ANSI/ASME B1.1 compliance and a hardened gauge-steel body provides an objective, repeatable check of internal threads. Used as a go/no-go verification device, this plug ensures that threads manufactured or repaired meet the specified 5/16‑18 UNC geometry and tolerance class 2B fit. By relying on a physical gauge rather than trial assembly, production faults are detected immediately, reducing downstream scrappage and rework. The compact form and clear pass/fail outcome make this instrument especially suitable for in-process inspection stations and final quality checks where throughput and traceability matter.

Standards-aligned design that simplifies documentation and audit trails

Built to the ANSI/ASME B1.1/B1.2 thread standards, the gauge supports consistent reporting and acceptance criteria across suppliers and customers. The hardened material minimises wear, keeping the gauge within specification for longer intervals between checks. Where calibration records are required for quality management systems, the geometry and marking of the gauge make it straightforward to reference in inspection plans. This predictability aids engineering teams and quality engineers who must demonstrate conformance in audits or supplier assessments.

Robust construction that reduces total cost of ownership

Manufactured from gauge steel, hardened, the gauge resists deformation and abrasion that would otherwise invalidate measurements. Less frequent replacement translates into lower lifecycle costs and fewer interruptions for recalibration or tool changeovers. The solid construction also supports stable handling in the workshop environment, ensuring that each verification is performed with the same contact conditions—an important factor when aiming for reproducible acceptance testing across shifts and operators.

Practical handling and integration into routine inspection

The gauge’s straightforward geometry and clear labelling make it quick to use at a manual inspection point or in a dedicated quality station. Its modest weight supports single-person handling without fatigue, while the defined 2B tolerance allows machinists and fitters to interpret results immediately. For operations seeking a robust, low-complexity solution, this gauge delivers a direct measure of thread compliance without electronic interfaces or software dependency, which keeps training and maintenance demands minimal.

Contact Metav Werkzeuge for a specification check or to arrange delivery of the Metav IndustryLine thread plug gauge M315.921, and benefit from local stock and technical advice from Emmerich

Technical data

• Article number: M315.921
• GTIN: 4054469179544
• SKU: M315.921
• Tariff number: 90173000

Facts

• Thread size: 5/16"
• Thread pitch: 18 TPI
• Tolerance class: 2B
• Weight: 0.1 kg

Special features

• Material: Gauge steel, hardened
• Standard: ANSI/ASME B1.1/B1.2
• Category: Gauges; measuring pins

FAQ

What thread size does this gauge inspect?
The gauge inspects 5/16‑18 UNC internal threads and is manufactured to ANSI/ASME B1.1 geometry for that size.

Is the gauge suitable for audit documentation?
Yes. The Metav IndustryLine plug gauge is standards‑aligned and labelled for easy reference in inspection records and audit trails.

How durable is the gauge in daily use?
Constructed from hardened gauge steel, the gauge is designed for prolonged service with low wear under normal inspection conditions.

Does the gauge specify tolerance or fit class?
The tool is supplied for tolerance class 2B, which is the standard internal thread fit for UNC series under ANSI/ASME B1.1.

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