Bolts with cylindrical heads and hexagonal grooves

Product name:Hex Socket Countersunk screw

Product Standards： GB /T 70.3 - 2000

                                    DIN 7991 - 1986

                                    ISO 10642 - 2019

                                    JIS B 1194 - 2006

                                   ANSI/ASME B 18.3.5M - 1993

Common Specifications：

Thread diameter：M6\M8\M10\M12\M14\M16\M18\M20\M24

Thread length：20mm\25mm\30mm\35mm\40mm\50mm\60mm\70mm\80mm\90mm\100mm

Product material：35K\45#

Product grade：8.8

Surface treatment：blackened

Industry use：Machinery Industry

Production site: Handan City, Hebei Province, China

Means of transaction：TT/LC

MOQ：2Ton

Product packaging：Tray+Carton

Delivery period: 30 days

1.What is the difference between countersunk head socket head cap screws and ordinary socket head cap screws?

The difference between countersunk head socket head cap screws and ordinary socket head cap screws is mainly reflected in the structure of the screw head. The screw head of the countersunk head socket head cap screw is conical. After installation, the screw head can be stuffed into the installation surface to ensure the flatness of the installation surface. The screw head of the ordinary hexagon socket screw is cylindrical. After installation, the screw head protrudes above the installation surface.

2.Detailed explanation of countersunk head bolt specifications？

Countersunk head 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 type is called A type, and the thin type is called B type. If the connecting piece is too thick, it is better not to use bolts, and it is not suitable to use screw connections in places where disassembly and assembly are frequent.

3. What is the definition of countersunk head screw?

Countersunk head screw, also known as flat machine screw, its head is a 90-degree cone, similar to common wood screws. On the surface of the mounting hole on the connector, a 90-degree conical socket is machined, and the head of the flat machine screw is in the socket and is flush with the surface of the connector. Flat machine screws are also used in some occasions with semi-circle head flat machine screws, which are more beautiful and are used for places where a little protrusion is allowed on the surface.

4. Countersunk head bolt specifications?

1. The end of GB/T2-1985 fastener external thread parts

2. GB/T90-1985

3. GB/T196-1981 common thread, basic size (diameter 1~600mm)

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

5. GB/T1237-2000

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

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

8. GB/T3098.10-1993 Mechanical properties of fasteners, bolts, screws, studs and nuts made of non-ferrous metals

9. GB/T3103.1-1982 (Confirmed in 1988) Fastener Tolerance Bolts, Screws and Nuts

10. GB/T3106-1982 (confirmed in 1988) bolts. The nominal length of screws and studs and the thread length of ordinary bolts.

11. GB/T5267-1985 Electroplating layer of threaded fasteners

12. GB/T5276-1985 Fastener Bolts, Screws, Studs and Nuts Size Codes and Markings

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

14. GB/T16938-1997 General technical conditions for fastener bolts, screws, studs and nuts

15. Thread specification d=M10, nominal length l=70mm, performance level 4.8, no countersunk head square neck head bolts at the surface, hexagon socket head countersunk head screws; M4 screws have a countersunk head diameter of 7.5mm and a shortest length of 8mm. The longest is 50mm.

http://www.senhong-fastener.com/