Thread Plug Gauge

Our company can customise the nominal diameter 0.8mm-300mm metric (M), American (UN , UNC, UNF, UNEF, UNS, NPSC, NPSM, NPSH, NPSF, NPSI, NPSL, NH), British (BSW, BSF), Japanese standard PT, German standard RP (DIN2999), G-tube buckles, square buckles (Rectangle), R buckles ( Rd DIN405), serrated, trapezoidal (Tr, ACME, STUB ACME), gas cylinder (PZ, W), taper (NPT, NPTF, Z, BKG, R, RB, Rc, RP, PT, ZG, WKG, BSPT, ANPT, PTF, etc.), pipe thread gauges (G, PF, PS, BSP, BSPP, etc.), special for sewing machines (SM), ST wire thread gauge, bicycle (battery car) special thread gauge (B, BC), electrical appliances special thread (1BA, 2BA, 3BA, 4BA, 5BA, etc.), valve thread (5V1, 8V1, etc.) 80 ° thread gauges (Pg7, Pg9, Pg11, Pg13.5, Pg16, Pg21, Pg29, Pg36 Pg42, Pg48), API standard gages, API oil pipe thread gages, API taper gages, sucker rod thread gages (CYG13-10, CYG16-10, CYG19-10, CYG22-10, CYG25-10, CYG29-10,

KGG32-10, KGG36-10, KGG40-10), Oil pipe thread gauge (LP, TBG, UP TBG, CSG, LCSG, NC).

Precision Measurement Definition and Core Functions of Thread Plug Gauges

STORAEN’s thread plug gauges are essential metrology tools designed to verify the dimensional accuracy of internal screw threads, ensuring compliance with international standards and optimal mechanical performance. As a critical thread measuring gauge, our solutions define precision through a dual-function Go/No-Go design, catering to diverse thread types—from metric and inch-based profiles to specialized BSP thread gauges and BSPP thread gauges for pipe systems.

Defining Precision in Thread Inspection

A thread plug gauge serves as a binary verification tool: the "Go" end must pass through the internal thread smoothly, confirming it meets the minimum material condition (nominal size minus allowable tolerance), while the "No-Go" end should not enter, ensuring the thread does not exceed the maximum allowable tolerance. This design eliminates subjective judgment, providing objective results for critical parameters like pitch diameter, thread angle (e.g., 60° for metric, 55° for BSP), and pitch. STORAEN’s gauges adhere to thread plug gauge standard references such as ISO 965-3, ASME B1.2, and DIN 13, guaranteeing traceable accuracy across industries.

Core Functions for Diverse Applications

Comprehensive Thread Type Coverage

Our screw thread gauges accommodate a wide spectrum of thread profiles:

Metric Threads (M Series): Ideal for general industrial use, with precision grades up to 6H for tight-tolerance applications like automotive engine components.
BSPP (Parallel) & BSPT (Tapered) Threads: Engineered for leak-proof pipe connections in hydraulic systems (BSPP) and gas pipelines (BSPT), ensuring compliance with ISO 7-1 and BS EN 10226 standards.
NPT Threads: Custom solutions for conical pipe threads per ASME B1.20.1, critical for oil and gas sector pressure integrity.

Efficiency in Quality Control

The intuitive Go/No-Go mechanism reduces inspection time by up to 50% compared to manual measurement methods, making it indispensable for high-volume production lines. By instantly flagging non-conforming threads, our thread gauge tool minimizes rework costs and prevents faulty components from progressing to assembly—an essential function in aerospace fastener manufacturing or medical device production, where thread failure risks are catastrophic.

Material and Design Durability

Constructed from high-carbon tool steel (hardened to 60HRC+) or tungsten carbide, STORAEN’s thread plug gauges resist wear and maintain dimensional stability even in high-temperature or abrasive environments. The surface finish (Ra ≤ 0.05μm) ensures smooth insertion, protecting both the gauge and workpiece from damage during repeated use.

Trust in STORAEN for Critical Thread Assurance

Whether calibrating internal threads in automotive transmissions, verifying BSPP connections in industrial hydraulics, or ensuring compliance of NPT threads in energy infrastructure, STORAEN’s thread plug gauges deliver unmatched precision and reliability. By combining rigorous adherence to thread plug gauge standard with versatile design for global thread types, we empower manufacturers to achieve zero-defect production—one thread at a time.

Technical Specifications and Manufacturing Processes of Thread Plug Gauges

STORAEN’s thread plug gauges are precision-engineered metrology tools designed to meet the exacting demands of internal thread inspection, combining detailed technical specifications with rigorous manufacturing processes to ensure accuracy, durability, and compliance with global standards. As a trusted provider of screw thread gauges and BSP thread gauges, we deliver solutions that define excellence in thread measurement for industries ranging from automotive to aerospace.

Technical Specifications: Precision Defined for Every Application

Size & Thread Type Coverage

Our thread plug gauges span a versatile nominal diameter range from 0.8mm (M1) for micro-precision components to 300mm (M300) for heavy industrial threads, accommodating diverse profiles:

Metric Threads (ISO): Grades 4H to 8H, ideal for general engineering (e.g., M20×1.5-6H);
BSPP & BSPT Threads: Parallel (BSPP, ISO 7-1) and tapered (BSPT, BS EN 10226) variants for leak-proof pipe connections, including sizes like G1/2 and R1/4;
Specialized Types: Custom solutions for NPT, acme, and proprietary threads, ensuring compatibility with thread plug gauge standard references such as ASME B1.2 and DIN 13.

Accuracy & Tolerance Control

Available in precision classes h6 to h9 (with h6 as the highest grade), our gauges achieve micron-level accuracy (e.g., ±0.0015mm for M10×1.0). Each thread measuring gauge is calibrated against traceable standards, accompanied by a certification linking to national metrology institutes (e.g., NIST, PTB), ensuring compliance with ISO 9001 quality systems.

Material & Surface Finish

Constructed from high-carbon tool steel (hardened to 60HRC+) or tungsten carbide for extreme wear resistance, our thread gauge tool features a mirror-like Ra 0.05μm surface finish to minimize friction during insertion. Optional TiN coatings enhance corrosion resistance in harsh environments, extending service life by 25%.

Manufacturing Processes: Craftsmanship in Every Step

Computer-Aided Design (CAD)

The process begins with 3D modeling of thread parameters—pitch, flank angle, and tolerance zones—using advanced software to ensure alignment with customer specifications and thread plug gauge standard requirements. Specialized modules handle complex profiles like BSPP thread gauges, ensuring precise replication of 55° thread angles and parallel flank designs.

Precision Machining

Raw materials undergo heat treatment to optimize hardness before CNC grinding and honing shape the thread profile with micron-level accuracy. For intricate geometries, wire EDM (electrical discharge machining) is used to create sharp, burr-free thread roots, critical for preventing measurement errors in tight-tolerance applications.

Superfinishing & Calibration

A rigorous superfinishing process polishes the gauge surface to the specified Ra finish, followed by multi-point calibration using coordinate measuring machines (CMMs) and optical interferometers. This ensures that both "Go" and "No-Go" ends meet their respective tolerance limits, as defined by international standards.

Quality Assurance & Certification

Every thread plug gauge undergoes 100% functional testing to verify Go/No-Go performance, with results documented in a traceable report. This commitment to quality makes our gauges the preferred choice for industries where thread integrity is non-negotiable, such as aerospace fasteners and medical device manufacturing.

Trust STORAEN for Uncompromising Precision

Whether you require a standard thread plug gauge for metric threads, a specialized BSP thread gauge for pipe systems, or a custom solution for proprietary profiles, STORAEN’s technical specifications and manufacturing expertise deliver unmatched reliability. By integrating global standards with innovative engineering, we ensure that every thread gauge tool we produce sets the benchmark for precision—empowering your quality control processes with confidence.