The countersunk head design is intended for applications where a flush finish is required, and the standard also covers thread design to ensure compatibility with a variety of materials. IS 18471 (Part 2) specifies the dimensions, mechanical properties, and functional characteristics of cross recessed countersunk head drilling screws with tapping screw threads, ranging from sizes ST2,9 to ST6,3, detailing head diameter, recess type, and drilling point specifications. Screws under this standard undergo testing including thread engagement, pull-out strength, and corrosion resistance, helping ensure the fastener performs reliably once installed into the material it's securing.

Tests

Mandatory Tests:

1. Dimensional Check (Head Diameter, Recess Type, Drilling Point)

2. Thread Engagement Test

3. Pull-Out Strength Test

4. Torsional Strength Test

5. Corrosion Resistance Test

6. Hardness Test

Optional Tests:

1. Surface Finish/Coating Inspection

2. Drive Recess Performance Test

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

Here are the key benefits of getting ISI Mark certification:

• Government Quality Assurance: The ISI mark confirms the screws meet the dimensional, material, and mechanical benchmarks set by BIS for countersunk head drilling screws.

• Mandatory Compliance: The DPIIT issued the Cross Recessed Screws (Quality Control) Order, 2024, mandating BIS certification for these screws, whether manufactured domestically or imported.

• Enhanced Market Competitiveness: Certified screws are preferred for applications requiring a flush, countersunk finish across construction, manufacturing, and automotive sectors.

• Consumer Trust: Certified screws are trusted for their precision, strength, and reliability, enhancing consumer confidence and market acceptance.

• Avoiding Supply Chain Disruption: Unregistered shipments can be detained at customs, and retailers or institutional buyers often check for a valid licence number before accepting goods — certification keeps your supply chain moving without holdups.

Frequently asked questions (FAQ)

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