Grade 8.8 Hex Head Bolts / Grade 8.8 Socket Head Cap Screws
- National Standard Code：GB/T 5782 / GB/T 5783
- Material：35K / 45# Steel/ 40Cr
- Surface Treatment：Black oxide finish / Electro-galvanized / Hot-dip galvanized / Dacromet coating
- Available Diameters：M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36
- Available Length (mm)：
M6 16 20 25 30 35 40 45 50 55 60 65 70 80 90 100...
M8 16 20 25 30 35 40 45 50 55 60 65 70 80 90 100...
M10 16 20 25 30 35 40 45 50 55 60 65 70 80 90 100...
M12 20 25 30 35 40 45 50 55 60 65 70 80 90 100 110...
M14 20 25 30 35 40 45 50 55 60 65 70 80 90 100 110...
M16 30 35 40 45 50 55 60 65 70 80 90 100 110 120 130...
M18 40 45 50 55 60 65 70 80 90 100 110 120 130 140 150...
M20 40 45 50 55 60 65 70 80 90 100 110 120 130 140 150...
M22 50 60 70 80 90 100 110 120 130 140 150 160 170 180...
M24 50 60 70 80 90 100 110 120 130 140 150 160 170 180...
M27 60 70 80 90 100 110 120 130 140 150 160 170 180...
M30 80 90 100 110 120 130 140 150 160 170 180 190 200...
M33 80 90 100 110 120 130 140 150 160 170 180 190 200...
M36 80 90 100 110 120 130 140 150 160 170 180 190 200...
Custom diameters and lengths are available upon request
Product Detail
Structure: This product is an integrated single-piece bolt. Matching flat washers, spring lock washers and nuts of corresponding materials can be assembled as required on site.
Application: Grade 8.8 quenched and tempered high-strength bolts are mainly used for main load-bearing joints of portal frame beam-column connections, primary & secondary steel beams, load-bearing trusses, crane girders and other main force-bearing components in steel structures; they are also applicable to high-standard secondary steel enclosure connections. The quenched and tempered high-strength material meets load requirements from wind, snow, seismic and normal dynamic loads. Fasteners of higher strength grades shall be adopted for ultra-heavy core bearing positions, while high anti-corrosion coatings are selected for corrosive environments. Graded material selection ensures overall structural safety and long-term durability of steel buildings.