Grade 4.8 Carbon Steel Black Allen Bolt, also referred to as hexagon socket head bolt, cap head screw and hexagon socket head screw, have different names, but they mean the same. The commonly used socket head cap bolts include grade 4.8, grade 8.8 and grade 10.9. It is also called socket head cap screw and socket head bolt. Its head is hexagonal and cylindrical.
Hex socket cap bolt are generally used in some machine tools and machine parts.
They have more joint strength to make sure the connection good.
And often used together with socket head wrench to fasten or loosen.
Kinds of Hex socket cap bolts:
1)By material:Carbon Steel
2)By grades:4.8
3)By Surface treatment:Black
Generally the high grade hex socket cap bolt are more popular in markets,like 4.8 grade, 8.8 grade,10.9 grade.
