PATIKIL 1/4-20 x 5/8 Inch Flat Head Socket Cap Screws, 20 Pcs Flat Countersunk Bolts Hex Socket Drive Machine Screws UNC Coarse Full Thread Black Oxide Grade 10.9 with Hex Spanner

• Unified Thread Specification: 1/4"-20 UNC; Inner Hex Dia: 3.96 mm / 0.16 inch; Head Outside Diameter: 12.38 mm / 0.49 inch; Total Length: 5/8 inch; Packing List: 20 Pcs x Flat Head Socket Cap Screws with 1 Pcs x Hex Spanner
• Premium Hex Drive Machine Screws: Made of durable carbon steel with a corrosion-resistant black oxide finish, strength level is 10.9 grade, wear-resistant, providing good strength and corrosion resistance in bad environments
• Good Stability & Beautifully Surface: 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
• Application: 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
• Instruction: All screws are coated with anti-rust oil to provide better performance. (NOTE: Please confirm the size before placing an order.)

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 Unified Thread Specification: 1/4"-20 UNC Inner Hex Dia: 3.96 mm / 0.16 inch Head Outside Diameter: 12.38 mm / 0.49 inch Total Length: 5/8 inch Hex Spanner Head Dia: 5/32（3.96mm) Strength Level: 10.9 Grade Packing List: 20 Pcs x Flat Head Socket Cap Screws with 1 Pcs x 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.