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Hexagon socket head screws, flat black socket head bolts
Flat Head Screws, also called Countersunk Screws, are conical with a flat outer face and a tapering inner face. An advantage to this type of screw is that very little of the head protrudes beyond the surface, allowing it to sink into the material.
Black is a common method for metal heat treatment. The principle is to make an oxide film on the metal surface to isolate the air and achieve rust prevention. Blackening is a common method for metal heat treatment. The principle is to make an oxide film on the metal surface to isolate the air and achieve rust prevention.
Product Name |
China manufacturing wholesale price grade 8.8 bolt and nut screw washer DIN931 DIN933 metric stainless steel galvanized hex bolt, nut. |
Size |
M1-M36, or non-standard as request&design |
Material |
Stainless Steel, Alloy steel, Carbon Steel, Brass, Aluminum and So on |
Grade |
4.8, 8.8, 10.9, 12.9.etc |
Standard |
GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS etc |
Non-standards |
OEM is available, according to drawing or samples |
Finish |
Plain, black, zinc plated/according to your requirement |
Certification |
ISO9001, IATF16949, |
Package |
according to customers requirement |
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