A thread gauge (or specifically a “go/no-go gauge”) is a precision measuring tool used for Check the fit of the threaded components. (such as bolts, nuts, or threaded holes) with defined dimensional standards.

Gauges for checking internal threads, external threads, screw heads, holes, etc.

Its primary purpose is to ensure that threaded components can be assembled and function correctly in mechanical products.

This device operates on a "Go/No-Go" principle and typically includes two test probes:

1. The "Go" button: Used to check the maximum material limit. If the “Pass” end screws into (or passes through) the threaded part smoothly, the part meets the maximum size requirement [1, 2].
2. The "No-Go" heading: Used to check the minimum material size limit (minimum dimensions). If the "Fail" indicator appears. cannot When screwed in (or only screwed in a maximum of 2 turns), the part meets the minimum size requirements.

1. Classification according to the purpose of the inspection

This is the most common classification method based on the details to be checked:

• Internal thread gauge (Plug Thread Gauge):
  • Used to inspect parts that have female thread (Threaded holes), for example, inspecting nuts or tapped holes.
  • The design typically consists of a cylindrical rod with two ends (Go and No-Go) or two separate gauges mounted on the same handle.

Sokuhansha thread gauges from Japan are distributed by Semiki.

• External thread gauge (Ring Thread Gauge):
  • Used to inspect parts that have male thread (External threads), for example, inspecting bolts or screws.
  • The design is in the shape of a ring with an internal threaded hole. Typically, there will be a separate "Go" ring and a "No-Go" ring.

Eisen internal and external thread gauges are distributed by Semiki.

Ring Thread Gauge: Eisen pin gauges are high-precision cylindrical measuring instruments primarily used to check the inner diameter of small holes and the width of grooves. Eisen is a well-known Japanese brand specializing in the production of these high-precision gauges.
Checking the hole diameter: This is the primary and most common function. The user inserts the gauge pin into the hole to be checked; if the gauge pin fits snugly or passes through easily (depending on the use of the "Go" head), it confirms the hole size is within the allowable tolerance range.

Eisen class 0 bore gauge distributed by Semiki.

Screw head gauges (Go/No-Go, Penetration, Final Inspection, Plug Gages, Concentricity Gages, Thickness, Driver bit, Recess, Wobble, Screw reces): Universal Punch Go/No Go, Penetration, Final Inspection, Pin Gauge, Concentricity Gauge, Thickness, Screw Tip, Indentation, Vibration, Screw Indentation, Screw Testing Equipment, Eccentricity, Overhang Height, Variable Value Thread Gauge, Special Module Measuring Equipment, SPC Data Acquisition System and Gauge Calibration Service.

UNIVERSAL-PUNCH #1184 Hexagon Screwdriver Bit Gauge (1184-04 ~ 1184-100)

Universal punch depth gages #9000 Phillips Type 1 Penetration gages  9000-02 (drive size 2)

2. Classification according to thread standards

Thread gauges are manufactured to conform to various thread standard systems around the world:

• Metric system: Common standards in Vietnam and most countries (e.g., M6x1.0, M8x1.25).
• Inch system (Unified/Imperial): Common standards in the US and some specific industries (e.g., UNC, UNF, NPT for pipe threads).
• Pipe Thread: Used for water and gas pipe connections, with specific standards such as NPT (USA) and BSP (UK).

3. Classification by shape type (less common)

• Pitch Gauge/Thread File: This is not a "Go/No-Go" gauge, but rather a set of thin, serrated steel plates with different standard thread pitches. They are used for quickly determine thread pitch of a detail when the specifications are unknown.

The choice Semiki Choosing them as your supplier of thread gauges is a reliable option because they are a company specializing in distributing genuine measuring equipment from Japan in the Vietnamese market. 

• Authentic and diverse products: Semiki is committed to distributing only products from reputable manufacturers, ensuring quality and compliance with technical standards. They offer thread gauges from many leading brands such as:
  • Eisen
  • OSG
  • Sokuhansha
  • Mitutoyo (thread pitch gauge)
  • Universal Punch
• High level of expertise: Semiki has a team of professional consultants who help customers choose the most suitable thread gauge for their technical requirements and budget, ensuring efficiency in their work.
• Clear warranty policy: The company has transparent warranty and return policies, providing customers with peace of mind during product use.
• Technical support: As a company specializing in measurement equipment, Semiki is capable of providing comprehensive technical support and solutions, going beyond simply selling products. 

Contact Semiki directly: You can find Semiki's contact information (via website or phone number) to request a quote and specific advice.

• Business email: [email protected]
• Phone number (Hotline): +84 979 761 016.
• Website: You can find out more details and send a consultation request via Semiki.com.