China Factory for Rag Bolt - Hot dip galvanized 4.8 grade DIN933 hexagon bolt diameter range M4-M52 – Tiancong Detail:
Surface treatment
Related Knowlege :
The bolt threading size after hot dip galvanized surface treatment process will become bigger than zinc plated , so HDG bolt thread must match the over size hex nut or the nut can not be threaded up. The hot dip galvanized surface can offer very strong anti-rust performance than electric zinc plated or black oxide surface.
The 4.8 grade bolt was produced by low carbon steel material, which is used for where only need small strength hardness
Product Parameter
Screw Thread d | M4 | M5 | M6 | (M7) | M8 | M10 | M12 | (M14) | M16 | (M18) | M20 | (M22) | M24 | (M27) | M30 | (M33) | M36 | (M39) | M42 | (M45) | M48 | (M52) | |||
P | Pitch | 0.7 | 0.8 | 1 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 | 3 | 3.5 | 3.5 | 4 | 4 | 4.5 | 4.5 | 5 | 5 | ||
a | max | 2.1 | 2.4 | 3 | 3 | 3.75 | 4.5 | 5.25 | 6 | 6 | 7.5 | 7.5 | 7.5 | 9 | 9 | 10.5 | 10.5 | 12 | 12 | 13.5 | 13.5 | 15 | 15 | ||
c | min | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | ||
max | 0.4 | 0.5 | 0.5 | 0.5 | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 1 | 1 | 1 | 1 | 1 | |||
da | max | 4.7 | 5.7 | 6.8 | 7.8 | 9.2 | 11.2 | 13.7 | 15.7 | 17.7 | 20.2 | 22.4 | 24.4 | 26.4 | 30.4 | 33.4 | 36.4 | 39.4 | 42.4 | 45.6 | 48.6 | 52.6 | 56.6 | ||
dw | Grade A | min | 5.9 | 6.9 | 8.9 | 9.6 | 11.6 | 15.6 | 17.4 | 20.5 | 22.5 | 25.3 | 28.2 | 30 | 33.6 | - | - | - | - | - | - | - | - | - | |
Grade B | min | 5.7 | 6.7 | 8.7 | 9.4 | 11.4 | 15.4 | 17.2 | 20.1 | 22 | 24.8 | 27.7 | 29.5 | 33.2 | 38 | 42.7 | 46.5 | 51.1 | 55.9 | 59.9 | 64.7 | 69.4 | 74.2 | ||
e | Grade A | min | 7.66 | 8.79 | 11.05 | 12.12 | 14.38 | 18.9 | 21.1 | 24.49 | 26.75 | 30.14 | 33.53 | 35.72 | 39.98 | - | - | - | - | - | - | - | - | - | |
Grade B | min | 7.5 | 8.63 | 10.89 | 11.94 | 14.2 | 18.72 | 20.88 | 23.91 | 26.17 | 29.56 | 32.95 | 35.03 | 39.55 | 45.2 | 50.85 | 55.37 | 60.79 | 66.44 | 71.3 | 76.95 | 82.6 | 88.25 | ||
k | Nominal Size | 2.8 | 3.5 | 4 | 4.8 | 5.3 | 6.4 | 7.5 | 8.8 | 10 | 11.5 | 12.5 | 14 | 15 | 17 | 18.7 | 21 | 22.5 | 25 | 26 | 28 | 30 | 33 | ||
Grade A | min | 2.68 | 3.35 | 3.85 | 4.65 | 5.15 | 6.22 | 7.32 | 8.62 | 9.82 | 11.28 | 12.28 | 13.78 | 14.78 | - | - | - | - | - | - | - | - | - | ||
max | 2.92 | 3.65 | 4.15 | 4.95 | 5.45 | 6.56 | 7.68 | 8.98 | 10.18 | 11.72 | 12.72 | 14.22 | 15.22 | - | - | - | - | - | - | - | - | - | |||
Grade B | min | 2.6 | 3.26 | 3.76 | 4.56 | 5.06 | 6.11 | 7.21 | 8.51 | 9.71 | 11.15 | 12.15 | 13.65 | 14.65 | 16.65 | 18.28 | 20.58 | 22.08 | 24.58 | 25.58 | 27.58 | 29.58 | 32.5 | ||
max | 3 | 3.74 | 4.24 | 5.04 | 5.54 | 6.69 | 7.79 | 9.09 | 10.29 | 11.85 | 12.85 | 14.35 | 15.35 | 17.35 | 19.12 | 21.42 | 22.92 | 25.42 | 26.42 | 28.42 | 30.42 | 33.5 | |||
k1 | min | 1.9 | 2.28 | 2.63 | 3.19 | 3.54 | 4.28 | 5.05 | 5.96 | 6.8 | 7.8 | 8.5 | 9.6 | 10.3 | 11.7 | 12.8 | 14.4 | 15.5 | 17.2 | 17.9 | 19.3 | 20.9 | 22.8 | ||
r | min | 0.2 | 0.2 | 0.25 | 0.25 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | 1 | 1 | 1 | 1 | 1 | 1.2 | 1.2 | 1.6 | 1.6 | ||
s | max=nominal size | 7 | 8 | 10 | 11 | 13 | 17 | 19 | 22 | 24 | 27 | 30 | 32 | 36 | 41 | 46 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | ||
Grade A | min | 6.78 | 7.78 | 9.78 | 10.73 | 12.73 | 16.73 | 18.67 | 21.67 | 23.67 | 26.67 | 29.67 | 31.61 | 35.38 | - | - | - | - | - | - | - | - | - | ||
Grade B | min | 6.64 | 7.64 | 9.64 | 10.57 | 12.57 | 16.57 | 18.48 | 21.16 | 23.16 | 26.15 | 29.16 | 31 | 35 | 40 | 45 | 49 | 53.8 | 58.8 | 63.1 | 68.1 | 73.1 | 78.1 |
Product detail pictures:




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We've been convinced that with joint efforts, the enterprise between us will bring us mutual benefits. We are able to assure you product or service quality and aggressive cost for China Factory for Rag Bolt - Hot dip galvanized 4.8 grade DIN933 hexagon bolt diameter range M4-M52 – Tiancong, The product will supply to all over the world, such as: Paraguay, Kenya, Bangkok, Only for accomplishing the good-quality product to meet customer's demand, all of our products have been strictly inspected before shipment. We always think about the question on the side of the customers, because you win, we win!

The factory workers have a good team spirit, so we received high quality products fast, in addition, the price is also appropriate, this is a very good and reliable Chinese manufacturers.
