M170×6.0-6H

China made M170×6.0-6H work plug gage in 4 week with calibration reports.

ISO Metric Thread Plug Gages: Standards, Specifications, and Custom Manufacturing by Sowant Precision Gage

​​Introduction to ISO Metric Thread Standards​​

ISO metric threads (M-series) are governed by ​​ISO 68-1​​ (basic profile), ​​ISO 261​​ (diameter/pitch combinations), and ​​ISO 965​​ (tolerances)

. These standards ensure global compatibility for fasteners, pipelines, and precision equipment. Key parameters include:

• ​​Thread Angle​​: 60° symmetrical V-profile with sharp crests and roots.
• ​​Designation​​: Labeled as ​​M[Diameter]×[Pitch]-[Tolerance Class]​​, e.g., ​​M170×6.0-6H​​.
• ​​Tolerance Classes​​:
  • ​​6H​​: For internal threads, ensuring compatibility with external 6g threads.
  • ​​6g​​: Common tolerance for general-purpose external threads
• ​​Critical Dimensions​​:
  • Pitch Diameter: D−0.6495×P
  • Minor Diameter: D−1.0825×P
  • Major Diameter: Nominal thread diameter

​​Sowant Precision Gage’s M170×6.0-6H Thread Plug Gage​​

Sowant Precision Gage, a leading Chinese manufacturer, specializes in high-precision ISO-compliant thread plug gages. The ​​M170×6.0-6H​​ model exemplifies their expertise:

​​1. Specifications​​

• ​​Nominal Diameter​​: 170 mm
• ​​Pitch​​: 6.0 mm (coarse thread for heavy-duty applications).
• ​​Tolerance Class​​: 6H (for internal thread inspection).
• ​​Material​​: Hardened alloy steel with chrome plating for wear resistance and corrosion protection
• ​​Accuracy​​: Complies with ISO 965-3 tolerance limits (±0.01 mm pitch diameter deviation)

​​2. Applications​​

• Validates large-diameter internal threads in oilfield equipment, hydraulic systems, and industrial valves.
• Ensures sealing integrity in high-pressure environments (>50 MPa)

​​3. Quality Assurance​​

• ​​GO/NO-GO Design​​:
  • GO Gage: Must freely pass through the full thread length to confirm maximum material limits.
  • NO-GO Gage: Permits ≤2 turns to verify minimum material limits
• Calibration traceable to ISO 1502 standards

​​Manufacturing Standards for ISO Metric Thread Gages​​

Sowant adheres to stringent ISO guidelines for thread gage production:

1. ​​Profile Accuracy​​: Thread flank angles maintained at 60°±15′, with crest/root radii controlled to ≤0.125×P
2. ​​Surface Finish​​: ≤0.8 μm Ra to minimize friction during inspection
3. ​​Hardness​​: 58–65 HRC for durability in industrial environments
4. ​​Certification​​: Each gage includes a test report with measured pitch diameter, minor diameter, and thread angle

​​Parameters Required for Custom Orders​​

When ordering ISO metric thread gages (e.g., M170×6.0-6H), provide the following details:

1. ​​Basic Dimensions​​:
   • Nominal diameter (e.g., 170 mm).
   • Pitch (e.g., 6.0 mm).
2. ​​Tolerance Class​​: 6H (internal) or 6g (external)
3. ​​Thread Type​​: Standard metric (M), ACME, or Stub ACME
4. ​​Material Preference​​: Alloy steel, stainless steel, or carbide.
5. ​​Special Requirements​​:
   • Surface coatings (e.g., TiN for abrasion resistance).
   • Custom markings or certifications (e.g., ISO/IEC 17025)

​​Sowant Precision Gage’s Additional Offerings​​

1. ​​ACME/Stub ACME Thread Gages​​:

   • Designed for trapezoidal threads in lead screws and power transmission systems.
   • Tolerance classes: 2G/3G for ACME, 2C/3C for Stub ACME
   • Lead times: 2–4 weeks for standard sizes.

2. ​​Insize Metrology Tools (China HQ Partner)​​:

   • ​​Height Gauges​​: Insize 1230-300 (0–300 mm range, 0.001 mm resolution)
   • ​​Digital Calipers​​: Insize 3102-150 (0–150 mm, IP67-rated)
   • ​​Micrometers​​: Insize 4412-25 (0–25 mm, ±2 μm accuracy)
   • ​​Bore Gauges​​: Insize 4102-100 (2–100 mm range, 0.001 mm resolution)

Conclusion

Sowant Precision Gage combines ISO-compliant thread gage manufacturing with robust partnerships (e.g., Insize) to deliver precision tools for industries ranging from oil and gas to aerospace. Their ​​M170×6.0-6H thread plug gage​​ exemplifies technical excellence, while their ACME and Stub ACME products offer versatile solutions for specialized applications. For orders, ensure precise specifications to leverage their short lead times and cost-effective production

.

​​For detailed catalogs or quotations​​, contact Sowant Precision Gage or refer to ISO 965-3:1980 and ISO 261:2023 standards

.

​​References​​:

: Thread plug gauge basics (Beijing TechNano, 2024).

: ISO 965-3:1980 tolerance standards for metric threads.

: Ultra ISO metric thread gauges (Shanghai Hongfu Instrument, 2024).

: Challenges in metric thread inspection (Li Xiaobin, 2022).

: M-value query tables for thread plug gauges (2025).

: Thread gauge usage guidelines (Gaoxun Zhizao, 2025).

: Custom thread gauge solutions (Chemical Instrument Network, 2024).

: Insize instrument specifications (Sowant partnership details).