Detailed description of countersunk head bolt specifications

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

Countersunk screw definition:

Countersunk screws, also known as flat machine screws, have a 90-degree cone at the head, similar to common wood screws. The head has a tool fastening groove, such as sawtooth, cross and internal hexagon. On the surface of the mounting hole on the connector, a 90-degree conical circular socket is machined, and the head of the screw of the flat knitting machine is located in this circular socket, which is flush with the surface of the connector. Semi-circular flat machine screws are also used in some occasions. This kind of screw is very beautiful and is used where the surface is allowed to protrude a little.

Specification of countersunk head bolts:

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

2、GB/T90- 1985

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

4.GB/T197-1981general thread tolerance and fit (diameter1~ 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。 10- 1993 mechanical properties of non-ferrous metal fasteners, bolts, screws, studs and nuts.

9、GB/T3 103。 1- 1982 (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.

1 1 electroplated layer, GB/T5267- 1985 threaded fastener.

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 countersunk square head bolts and hexagon countersunk head screws on the surface; The countersunk head diameter of M4 screw is 7.5 mm, the shortest length is 8 mm, and the longest is 50 mm. ..

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 provided at both ends. Generally speaking, the bolt is a concave part in the middle of the screw head, which can connect multiple parts to realize the mechanical function of the machine.

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