M4 M16 Carbon steel L & J Hook Bolt with nut washer Class4.8 grade 8.8 Zinc plating

M4 M16 Carbon steel L & J Hook Bolt with nut washer Class4.8 grade 8.8 Zinc 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

There are two main ways to judge the hardness of steel, which are Brinell hardness in HB and Rockwell hardness. Firstly, from the Brinell hardness, will be a hardness higher than the measured steel ball to the steel above, and apply a force F, then the ball will be in the measured steel will leave a dent, measured, the area of M, then Rockwell Brinell hardness will be F/M. Next Rockwell hardness is also convenient to explain the only difference between the latter and the former Rockwell hardness measurements is the force to force to divide by the depth of the small ball plunged into the.

Steel can be improved by mixing it with alloys, for example by adding carbon, known as carbon steel, which increases its hardness and rigidity but decreases its toughness and plasticity. By adding chromium, the hardness and rigidity of steel can be increased with less effect on its toughness. By adding titanium, the hardness and toughness of steel is increased.

The properties of steel can vary after different types of processing, with a focus on quenching and tempering, two of the earliest forms of steel processing that I learnt about as a child, both of which I learnt about through the game Ride and Slash. Firstly, quenching is the process of heating steel to over 723 degrees and then soaking it in water for a rapid cool down to increase the hardness and decrease the malleability of the steel. Tempering means heating the steel to over 723 degrees and then cooling it slowly to increase its strength and toughness at the same time.

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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