HAIYAN BOLT produce both carbon steel and stainless Hex bolt.
Standard: DIN933, DIN931,ANSI/ASME B 18.2.1
GRADE: 4.8 to 12.9,Gr 2 to Gr 10, A2-304,A4-316
Material: carbon steel, alloy steel,stainless steel.
Size:from 1/4” to 2”, from 6mm to 50mm.
Surface finish:zinc plated, plain, black oxide, HDG,mech galv, decromet
Packing: cartons with plywood pallet
Supply ability: 200tons per month
Assembly: normally with hex nuts,flat washer and spring washers.
The performance grade of bolts for steel structure connection is divided into more than 10 grades, including 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc., among which the bolts of grade 8.8 and above are made of low carbon alloy steel or medium carbon steel and are heat treated (quenched and tempered), which are generally called high-strength bolts, and the rest are generally called ordinary bolts. The bolt performance grade mark consists of two parts of numbers, which respectively represent the nominal tensile strength value and yield strength ratio of bolt material. For example:
Bolts of property class 4.6 have the following meanings:
- The nominal tensile strength of bolt material reaches 400MPa;
- The yield strength ratio of bolt material is 0.6;
- The nominal yield strength of bolt material is up to 400 × 0.6 = 240mpa
The performance grade is 10.9 high strength bolt, and the material can reach the following after heat treatment:
- The nominal tensile strength of bolt material is up to 1000MPa;
- The yield strength ratio of bolt material is 0.9;
- The nominal yield strength of bolt material is 1000 × 0.9 = 900MPa
The meaning of bolt performance grade is the international general standard. For bolts with the same performance grade, regardless of the difference in material and place of origin, their performance is the same, and only performance grade can be selected in design.
Strength grades 8.8 and 10.9 refer to shear stress grades 8.8gpa and 10.9gpa of bolts