【100 Pcs M4 x 20mm Hex Socket Flat Head Cap Screws + 1 Pcs Hex Key Come In a Plastic Storage Box】

✔ Contains 100 Pcs M4 x 20mm hex socket flat head cap screws
--Meets/exceeds: DIN7991
--Thread size ( diameter ): 4 mm
--Thread Pitch: 0.7 mm
--Total length ( includes head ): 20 mm ( Range: 20.00 ± 0.42 mm), thread length (approximate ) 17.7 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 100 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 20mm-----100 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