Double-End GO/NOGO Thread Plug Gauge | Hardened Alloy Steel 6H Grade Thread Inspection Gauge Hoshing

Industrial-grade double-end internal thread plug gauge, manufactured from hardened alloy steel with standard Grade 6H accuracy (5H/6G/7H optional), fully compliant with DIN 13 and ISO 1502-96 international standards. Integrated GO (pass) and NOGO (fail) testing ends enable fast go/no-go thread tolerance verification in one operation. Full metric sizes from M2.0 to M140 are available, with imperial sizes and custom specifications supported. Single-unit retail is supported with no minimum order quantity, making it an essential quality control tool for internal thread inspection in machining, mold manufacturing, hardware production and automotive industries.

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Description

This precision thread plug gauge is a dedicated quality control measuring tool for internal thread tolerance inspection, widely applied in tapping, mold manufacturing, hardware processing and fastener production to verify whether the pitch diameter of internal threads falls within the qualified tolerance range. It adopts a double-end integrated design, with the GO end for minimum tolerance verification and the NOGO end for maximum tolerance verification, completing pass/fail judgment in one operation without replacing gauges, which greatly improves batch inspection efficiency.

Hardened Alloy Steel Durable Construction

All thread plug gauges are forged from high-grade alloy steel, overall quenched and hardened to deliver excellent wear resistance and long-term dimensional stability. The precision ground thread profile maintains accurate tooth shape and pitch after long-term frequent insertion testing, providing 3–5 times longer service life than ordinary carbon steel gauges, and is fully suitable for heavy daily workshop inspection work.
Standard 6H Accuracy & Multiple Grade Options

The default accuracy grade is 6H, the most widely used industrial standard for general internal thread inspection. Grade 5H, 6G and 7H are also available on request to match different thread tolerance requirements. Each gauge undergoes 100% factory calibration and inspection to ensure reliable and traceable inspection results.
Double-End GO/NOGO Integrated Design

One gauge integrates both GO (go-side) and NOGO (no-go-side) testing ends. The GO end, corresponding to the maximum material condition of the internal thread, should screw fully and smoothly into a qualified threaded hole. The NOGO end, corresponding to the minimum material condition, should not screw in more than 2 threads, enabling intuitive and fast pass/fail judgment. The middle handle is marked with clear laser-engraved size, pitch and accuracy grade for easy identification and management.
Wide Size Range & Customization Support

The complete metric size range from M2.0 to M140 covers almost all common internal thread specifications in mechanical processing. Imperial thread sizes, special pitch gauges and custom non-standard thread gauges are also available to meet special industry inspection requirements. A 44-piece full set configuration with wooden storage case is also available for professional QC laboratories and tool rooms.
Retail-Oriented Global Shipping Configuration

Each single gauge is packed with independent shockproof packaging, and full sets are supplied with wooden storage cases. All Products are attached with full English specification sheets and factory inspection certificates. Standardized retail packaging is suitable for international express delivery, with clear packing dimensions and weight data for fast customs clearance.

Core Retail Selling Points

✅ Zero minimum order limit, single-unit retail supported for individual inspectors and small workshop restock

✅ Double-end GO/NOGO integrated design, one gauge completes fast pass/fail thread inspection

✅ Hardened alloy steel material, high wear resistance and long-term dimensional stability

✅ Standard Grade 6H accuracy, 5H/6G/7H optional for different tolerance requirements

✅ Compliant with DIN 13 and ISO 1502-96 international industrial standards

✅ Full metric size range M2.0 – M140, imperial and custom sizes available

✅ Clear laser marking for size, pitch and grade, easy to identify and manage

✅ 12-month retail warranty against manufacturing and accuracy defects

Standard Specification

Item	Parameter Detail
Product Type	Double-end GO/NOGO thread plug gauge
Standard Material	Hardened alloy steel
Default Accuracy Grade	Grade 6H
Optional Accuracy Grades	5H / 6G / 7H
Compliance Standards	DIN 13, ISO 1502-96
Metric Size Range	M2.0 – M140 (full sizes available)
Custom Options	Imperial sizes, special pitches, non-standard threads
Marking	Laser engraved size, pitch and accuracy grade
Set Option	44-piece complete set with wooden storage case
Main Application	Internal thread go/no-go inspection, tapping quality control, thread tolerance verification

Full Metric Size Model Reference Table

Model No.	Thread Size	Pitch	Model No.	Thread Size	Pitch
1002-002	M2.0	0.40	1002-042	M42.0	4.00
1002-0022	M2.2	0.45	1002-045	M45.0	4.00
1002-0025	M2.5	0.45	1002-048	M48.0	4.00
1002-003	M3.0	0.50	1002-052	M52.0	4.00
1002-0035	M3.5	0.60	1002-056	M56.0	5.50
1002-004	M4.0	0.70	1002-060	M60.0	5.50
1002-005	M5.0	0.80	1002-064	M64.0	6.00
1002-006	M6.0	1.00	1002-068	M68.0	6.00
1002-008	M8.0	1.25	1002-072	M72.0	6.00
1002-010	M10.0	1.50	1002-076	M76.0	6.00
1002-012	M12.0	1.75	1002-080	M80.0	6.00
1002-014	M14.0	2.00	1002-085	M85.0	6.00
1002-016	M16.0	2.00	1002-090	M90.0	6.00
1002-018	M18.0	2.50	1002-095	M95.0	6.00
1002-020	M20.0	2.50	1002-100	M100.0	6.00
1002-022	M22.0	2.50	1002-105	M105.0	6.00
1002-024	M24.0	3.00	1002-110	M110.0	6.00
1002-027	M27.0	3.00	1002-115	M115.0	6.00
1002-030	M30.0	3.50	1002-120	M120.0	6.00
1002-033	M33.0	3.50	1002-125	M125.0	6.00
1002-036	M36.0	4.00	1002-130	M130.0	6.00
1002-039	M39.0	4.00	1002-140	M140.0	6.00

Target Retail Buyers

CNC machining technicians, mold manufacturing QC inspectors, hardware production quality control staff, automotive parts inspection engineers, fastener manufacturing technicians, toolroom management personnel, vocational machining training labs, small mechanical processing workshops.

Applications

CNC Machining

Ideal for CNC lathe, milling and machining center operations, ensuring high-precision dimensional control and reliable tool holding for mass production.

Quality Control Labs

Suitable for quality inspection departments and calibration labs, providing accurate measurement data to verify product compliance with ISO and industry standards.

Mold & Die Making

Perfect for mold and die workshops, where micron-level precision tools and gauges are essential for complex cavity machining and final inspection.

OEM/ODM Projects

Customizable solutions for OEM and ODM manufacturing partners, offering tailored measuring tools and CNC accessories to meet unique production requirements.

Automotive Manufacturing

Designed for automotive component production lines, ensuring consistent precision and durability in engine parts, transmission components and assembly processes.

Aerospace & Precision Engineering

Ideal for aerospace and defense manufacturing, where ultra-high precision instruments and reliable tool holders meet strict quality and safety requirements.