These screws feature a cross-shaped indentation and a flat head designed to create thread in both metallic and non-metallic materials, making them vital for robust and efficient assembly across various applications. IS 18480 (Part 2):2023 specifies the characteristics of these screws for thread sizes ranging from ST 2.2 to ST 9.5. The standard covers dimensions and tolerances including the diameter and height of the countersunk flat head, thread length, pitch, and thread form, as well as material specifications emphasizing strength, corrosion resistance, and durability, and surface finish criteria covering appearance, corrosion resistance, and frictional properties. Because the countersunk profile is designed to sit flush with the surrounding surface, dimensional accuracy under this standard directly affects both the fit and finish of the finished assembly.

Tests

Mandatory Tests:

1. Dimensional Check (Head Diameter, Head Height, Thread Length, Pitch, Thread Form)

2. Tensile Strength Test

3. Shear Strength Test

4. Hardness Test

5. Corrosion Resistance Test

Optional Tests:

1. Surface Finish Inspection

2. Coating Thickness Test

Benefits of Obtaining ISI Mark for Cross Recessed Tapping Screws – Countersunk Flat Head

Here are the key benefits of getting ISI Mark certification:

• Government Quality Assurance: The BIS certification mark indicates that the product has undergone rigorous testing and evaluation processes to ensure compliance with specified parameters.

• Mandatory Compliance: BIS certification is mandatory under the Cross Recessed Screws (Quality Control) Order, 2024, issued by the DPIIT, Ministry of Commerce & Industry.

• Enhanced Market Competitiveness: These screws are reliable for various applications across construction, manufacturing, and engineering, valued for precision, durability, and efficiency in fastening tasks.

• Consumer Trust: This mark instils trust and confidence among consumers, indicating that the screws meet the requisite quality standards and are suitable for their intended application.

• Global Alignment: With the adoption of this standard, India aligns more closely with international norms for tapping screws, promoting both quality and competitiveness.

Frequently asked questions (FAQ)

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