M4 M16 Carbon steel L & J Hook Bolt with nut washer Class4. grade 8.8 Yellow

Product Specification

M4 M16 Carbon steel L & J Hook Bolt with nut washer Class4. grade 8.8 Yellow plating

Product Description:
1,Fixed footbolt is also called short footbolt, it is poured together with the foundation and used to fix the equipment without strong vibration and shock.
2,Activity foot bolt also known as long foot bolt, is a kind of removable foot bolt, used to fix the work of strong vibration and shock of heavy machinery and equipment.
3,Expansion anchor anchor bolt is often used to fix the static simple equipment or auxiliary equipment. Expansion anchor anchor bolt installation should meet the following requirements: the distance from the bolt centre to the edge of the foundation is not less than 7 times the diameter of the expansion anchor anchor bolt; installation of expansion anchor anchor bolt foundation strength shall not be less than 10MPa; drilling holes shall not be cracked, and attention should be paid to preventing the collision of drilling bit with the reinforcement bars in the foundation and the embedded pipe; the diameter and depth of drilling holes should be matched with the expansion anchor anchor bolt.
4,Bonding anchor bolt is a kind of anchor bolt commonly used in recent years, and its method and requirements are the same

Installation

1,One time burying method: when pouring concrete, bury the ground bolt. When the tower is controlled by tilting, the anchor bolts should be buried at one time.
2,Pre-reserved hole method: When the equipment is in place, clean the holes, put the foot bolts into the holes, and then use non-shrinkage fine gravel concrete, which is one level higher than the original foundation, for pouring and compacting after the equipment is positioned and corrected. The distance from the centre of the footbolt to the edge of the foundation should not be less than 2d (d is the diameter of the footbolt) and should not be less than 15mm (not less than 10mm when d≤20), and not less than half of the width of the anchor plate plus 50mm, and when it cannot satisfy the above requirements, appropriate measures should be taken to strengthen it. The diameter of the anchor bolts for structure should not be less than 20mm. when subjected to seismic action, it should be fixed by double nuts or other effective measures to prevent loosening, but the anchoring length of the anchor bolts should be increased by 5d compared with that of the non-seismic action.

Installation planning of the foot bolt Foot bolt loose in the foundation of the treatment in the near tightening of the foot bolt, may be pulled out of the bolt live, at this time should be the first bolt adjusted to the original position, and the bolt around the foundation to shovel out enough position, and then weld the bolt on the longitudinal and transverse two U-shaped rebar, and finally water will be cleaned in the pit and grouting, to be the concrete is solidified to the design strength, and then tighten the live foot bolt deviations in the treatment of the living foot The processing method of bolt deviation is roughly the same as that of the dead foot bolt, only that the foot bolt can be pulled out and processed. If the bolt is too long, it can be cut off a section on the machine and then set the thread; if the bolt is too short, it can be elongated by hot forging method; if the position does not match, it can be corrected by bending method.
Application industry: suitable for all kinds of equipment fixing, steel structure foundation pre-embedded parts, street lamps, traffic signs, pumps, boiler installation, heavy equipment pre-embedded fixing, etc.

Applications

Galvanising is a surface treatment technique whereby a layer of zinc is deposited on the surface of a metal, alloy or other material to provide aesthetic appeal and to prevent rusting. The main method used is hot-dip galvanising.
Zinc is soluble in acids and alkalis, so it is called an amphoteric metal. Zinc hardly changes in dry air. In humid air, a dense film of alkaline zinc carbonate is formed on the surface of zinc. In containing sulfur dioxide, hydrogen sulfide and marine atmosphere, zinc corrosion resistance is poor, especially in the high temperature and high humidity containing organic acid atmosphere, zinc coating is very easy to be corroded. The standard electrode potential of zinc is -0.76V, for the steel substrate, zinc plating belongs to the anodic plating, which is mainly used to prevent corrosion of steel, the advantages and disadvantages of its protective properties and the thickness of the plating is very large. Zinc coating can significantly improve its protective and decorative properties after passivation treatment, dyeing or coating with gloss protection agent.

According to the relevant standards, carbon steel, alloy steel bolt performance level 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 and so on more than 10 grades, of which 8.8 and above bolts made of low-carbon alloy steel or medium-carbon steel and heat-treated (quenched, tempered), commonly known as high-strength bolts, and the rest of the commonly known as ordinary bolts. Bolt performance level marking has two parts of the digital composition, respectively, the nominal tensile strength of the bolt material value and flexural strength ratio value. Stainless steel bolts are divided into A1-50, A1-70, A1-80, A2-50, A2-70, A2-80, A3-50, A3-70, A3-80, A4-50, A4-70, A4-80, A5-50, A5-70, A5-80, C1-50, C1-70, C1-110, C4- 50, C4-70, C3-80, F1-45, F1-60, where the first letter and number represent the group of stainless steel, the second and third numbers represent the tensile strength of 1/10

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