M243×2.0-6g

ISO Metric Threads and Corresponding Gauges: A Comprehensive Overview

ISO metric threads are globally standardized screw threads defined by the International Organization for Standardization (ISO). These threads are widely used in mechanical engineering for their compatibility and precision. This article explores the specifications of ISO metric threads, details the parameters of the M243×2.0-6g and M243×2.0-6H thread gauges, and highlights the capabilities of Sowant Precision Gage Co., Ltd. in supplying high-quality gauges with short lead times and competitive pricing. Additionally, a list of 20 metric thread gauge models with diameters around 40 mm is provided.

1. ISO Metric Threads: Key Features

ISO metric threads are characterized by a 60° symmetrical thread angle and standardized pitch and diameter combinations. The designation system includes:

• M: Denotes metric threads.

• Nominal diameter: The major diameter of the thread (e.g., 243 mm in M243×2.0).

• Pitch: Distance between adjacent threads (e.g., 2.0 mm in M243×2.0).

• Tolerance class: Indicates thread fit (e.g., 6g for external threads, 6H for internal threads).

ISO standards such as ISO 262:2023 define selected sizes for bolts, screws, and nuts, covering diameters from 1 mm to 100 mm1. These threads ensure interchangeability and mechanical strength in industrial applications.

2. Specifications of M243×2.0-6g and M243×2.0-6H

M243×2.0-6g (External Thread Gauge)

• Application: Measures external threads (bolts, screws).

• Tolerance class: 6g (medium fit for general engineering).

• Key parameters:

  • Major diameter: 243 mm.

  • Pitch: 2.0 mm.

  • Tolerance limits: Defined by ISO 965-1, ensuring thread engagement without excessive clearance.

• Function: Ensures threads meet dimensional accuracy for assembly compatibility.

M243×2.0-6H (Internal Thread Gauge)

• Application: Measures internal threads (nuts, tapped holes).

• Tolerance class: 6H (standard fit for internal threads).

• Key parameters:

  • Minor diameter: Adjusted to accommodate pitch and tolerance.

  • Verification: Guarantees threads are within ISO 965-2 limits for proper load distribution.

• Function: Validates thread integrity to prevent stripping or loosening under stress.

3. Sowant Precision Gage: Reliable Supplier

Sowant Precision Gage Co., Ltd., an authorized distributor of Vermont Gage (USA), specializes in ISO-compliant thread gauges. Their offerings include:

• Product range: ANSI/ASME-compliant gauges for metric (6H/6g) and imperial threads.

• Material: Hardened tool steel (60–72 HRC) with chrome plating for durability.

• Advantages:

  • Short lead time (4 weeks).

  • Cost-effective solutions for industrial applications.

  • Certification: NIST-traceable and ISO-compliant.

4. 20 Metric Thread Gauge Models (~40 mm Diameter)

Below are ISO metric thread gauge models with nominal diameters close to 40 mm, derived from standards such as ISO 262:2023 and DIN 13-1:1999:

1. M36×4.0-6g/6H

2. M39×4.0-6g/6H

3. M40×3.0-6g/6H

4. M42×4.5-6g/6H

5. M45×4.5-6g/6H

6. M42×2.0-6g/6H

7. M39×3.0-6g/6H

8. M40×2.5-6g/6H

9. M38×3.0-6g/6H

10. M44×5.0-6g/6H

11. M40×1.5-6g/6H

12. M42×1.5-6g/6H

13. M45×3.0-6g/6H

14. M48×5.0-6g/6H

15. M36×3.0-6g/6H

16. M39×2.0-6g/6H

17. M40×4.0-6g/6H

18. M42×3.0-6g/6H

19. M45×2.0-6g/6H

20. M48×3.0-6g/6H

5. Conclusion

ISO metric thread gauges like M243×2.0-6g/6H ensure precision in manufacturing and assembly. Sowant Precision Gage provides robust solutions with rapid delivery and adherence to global standards. For industries requiring ~40 mm thread verification, the listed models offer versatile options for quality control.

For full specifications or custom orders, contact Sowant Precision Gage via their official channels.

Note: The designation "M243×2.0" may require verification for typographical accuracy, as standard ISO threads typically cap diameters at 100 mm1. Adjustments to common sizes (e.g., M24×3.0 or M42×2.0) are recommended for practical applications.