iexcell 50 Pcs M4 x 40mm Thread Pitch 0.7 mm Alloy Steel 12.9 Grade Hex Socket Flat Head Cap Screws Bolts Kit, Black Oxide Finish

【50 Pcs M4 x 40mm Hex Socket Flat Head Cap Screws + 1 Pcs Hex Key Come In a Plastic Storage Box】 ✔ Contains 50 Pcs M4 x 40mm hex socket flat head cap screws --Meets/exceeds: DIN7991 --Thread size ( diameter ): 4 mm --Thread Pitch: 0.7 mm --Total length ( includes head ): 40 mm ( Range: 40.00 ± 0.50 mm), thread length (approximate ) 37.7 mm --Screw head style: flat head, known as countersunk head, countersunk angle: 90 degree, head diameter: 7.82 mm ( Range: 7.82 ± 0.18 mm ), head length (approximate ) 2.3 mm --Screw drive style: hex socket drive, also known as internal hex drive, hex size: 2.5 mm --Made of alloy steel 40Cr, black oxide finish, high strength and anti-rust --Strength grade of screws : 12.9 Grade, hardness: HRC 39-44, tensile strength: 1220 N/mm² ✔ Contains 1 Pcs hex key to drive these screws conveniently and easily --Hex size: 2.5 mm --Made of chrome-vanadium steel, nickel plated, higher strength, anti-rust ✔ Easy to store: these 50 pcs hex socket flat head cap screws and 1 pcs hex key come in a plastic storage box, organized conveniently and easily [ Package Contains ] M4 x 40mm-----50 Pcs Hex Key------1 Pcs [ What is Hex Socket Drive ] Hex Socket Drive, also known as Internal hex drive, have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen wrench [ What is Flat Head ] Flat head is similar to standard pan head screws but have a curved top