Flat countersunk screw is suitable for power, aerospace, office equipment, petrochemical, electronics, communications, shipbuilding industry, machinery, etc. You can also see them in construction, manufacturing, engineering, assembling, landlord, repairmen, and other DIY projects.

Specification
Drive Type: Hex Socket
Material: Carbon Steel
Thread Count: 40 TPI Coarse Thread UNC
Thread Diameter: 4#-40
Inner Hex Dia: 1.59 mm (1/16 inch)
Head Outside Diameter: 5 mm / 0.2 inch
Total Length: 3/16" (4.57 mm)
Thread Length: 2.5 mm / 0.1 inch
Strength Level: 10.9 Grade
Packing List: 20 Pcs x Flat Head Socket Cap Screws with 1Pcs Hex Spanner

Advantage
1. Hex drive machine screws are made of carbon steel with a corrosion-resistant black oxide finish, durable, and wear-resistant， providing good strength and corrosion resistance in bad environments.
2. Hex drive countersunk bolts with clear threads, provide stability, and can be used for a long time. Beautifully cut and the head is flat. provide a good decoration, easy to use and install.

Instruction
1. Select the appropriate screw size and length.
2. Use a hex drive wrench to insert the screw into the pre-drilled threaded hole.
3. Tighten the screw until the screw head is in firm contact with the mounting surface.

NOTE: Please confirm the size before placing an order.