Self-tapping screws are an excellent choice for joining thin sheets of metal without the need for pre-drilling. They have a unique design that allows them to cut their own threads as they are driven into the material. Here's more information about self-tapping joint screws: 

HEX FLANGE SELF-TAPPING JOINT SCREW 5.5x20

Items Number : 000006

Part Number : AB-HSTS12-11L20E-NDPRC-S1000

Description : AB™ head mark hex flange head  joint screw 5.5x20 with EPDM washer, needle drill point

Pack Qty (Pcs) : 3000  (500Pcsx6) per Box (Minimum sales quantity 3000 Pcs.)

Hex head flange self-tapping joint screws are mostly used for connection between thin metal plates (steel plates).

Self-tapping Joint screws are widely used in construction, automotive, electronics, and other industries for joining thin metal sheets, plastic, and other materials. They are suitable for applications where rapid installation and a strong, reliable connection are required. When using hex self-tapping joint screws for steel structures, it’s crucial to follow proper procedures to ensure the integrity and safety of the construction. Here is a general application process:

• Drilling (If Necessary):

1. Depending on the hex-tapping joint screws used and the thickness/hardness of the steel, pre-drilling may be required.

•  Screw Installation:

1. Use a hex key or wrench that corresponds to the size of the hex head on the screws. Ensure the tool is in good condition.

2. Apply the recommended torque to the screws. Avoid over-tightening, as it may compromise the integrity of the joint or the threads.

3. Ensure that the screws are driven straight into the steel to prevent misalignment or damage.

• Quality Control:

1. After installing each screw, inspect the joint for proper alignment and tightness. Make any necessary adjustments.

2. Look for any defects in the screws or steel components. Replace any damaged screws immediately.

• Documentation:

1. Keep detailed records of the installation process, including screw sizes, torque values, and any deviations from the standard procedure.

2. Ensure that the construction adheres to local building code and regulations in Bangladesh.

• Post-Installation Inspection:

1. After completing the installation, conduct a thorough inspection of the entire structure to ensure the integrity of the joints.

Maximum 1 mm thick for needle drill point.

• Use a hex socket H#8 (5/16").

• Use a mains-powered or cordless screwdriver with a drive speed of 2500 RMP maximum.

• Fit the driver bit into the screw and place it in the fastening position.

• Apply consistently firm pressure (end load) to the screwdriver until the screw has fastened.