Countersunk bolts are actually used to connect machinery and also have the function of fixed connection. Threads and screws are also very important parts, both thick and thin. Generally speaking, the thick one is called type A and the thin one is called type B. If the joint is too thick, it is best not to use bolts, and it is not suitable to use bolts in places where disassembly is frequent. Bolt standard can help us make better choices. Next, I'd like to introduce the specification sheet of countersunk head bolts to you.

Countersunk screw definition:

Countersunk screw, also known as flat machine screw, has a 90-degree cone at its head, which is similar to common wood screws. There are tool fastening grooves on the head, such as sawtooth, cross and internal hexagon. A 90-degree conical circular socket is machined on the surface of the mounting hole on the connector, and the head of the screw of the flat knitting machine is located in this circular socket, which is flush with the connector surface. Flat machine screws are also used in some occasions with semi-circular head flat machine screws, which are beautiful and used in places where the surface can allow a little protrusion.

Specification of countersunk head bolt:

1, GB/T2- 1985 fastener external thread end parts

2、GB/T90- 1985

3.GB/T196-1981basic dimensions of common threads (diameter 1~600mm)

4.GB/T197-1981general thread tolerance and fit (diameter 1~355mm)

5、GB/T 1237-2000

6. GB/T3098. 1-2000 Mechanical properties of bolts, screws and studs for fasteners

7. GB/T3098 .6-2000 Mechanical properties of fasteners, stainless steel bolts, screws and studs

8. GB/T3098. Mechanical properties of fasteners, bolts, screws, studs and nuts made of non-ferrous metals

9. GB/T3103.1-kloc-0/982 (confirmed by 1988) Fastener tolerance bolts, screws and nuts.

10, GB/T 3 106- 1982 (confirmed by 1988) bolts. Nominal length of screws and studs and thread length of ordinary bolts.

Electroplated layer 1 1, GB/T5267- 1985 threaded fasteners.

12, GB/T5276- 1985 dimensions, codes and labels of fasteners, bolts, screws, studs and nuts.

13, GB/T5779. 1-2000 general requirements for bolts, screws and studs with surface defects of fasteners.

General specification for bolts, screws, studs and nuts of fasteners (GB/T 16938- 1997)

15, thread specification d=M 10, nominal length l=70mm? Performance grade 4.8, no flat countersunk square neck bolts and hexagon countersunk head screws on the surface; M4 screw countersunk head diameter is 7.5mm, the shortest is 8mm, and the longest is 50mm. ..

The above is a detailed introduction to the specification table of countersunk head bolts. Countersunk bolt is a fastener consisting of countersunk head and screw, the head is conical, countersunk head bolt (with groove, countersunk head bolt (with tenon. Generally speaking, a stud bolt is a case where one end is screwed into a screw hole and the other end is connected with a nut. For those studs with the same length, nuts are installed at both ends. Generally speaking, the bolt is the concave part in the middle of the screw head, which can connect multiple parts to realize the mechanical function of the machine.