Fastener Material Selection

- May 28, 2018-

120pcs M3 Male Female Brass Standoff Spacer PCB Board Hex Screws Nut Assortment.jpg

Fastener Material Selection

First, Currently, standard parts on the market mainly include carbon steel (including easy steel), stainless steel (including stainless steel), and copper (including copper).

(a) Carbon steel. We distinguish low-carbon steels, medium-carbon steels and high-carbon steels, and alloy steels from the carbon content of carbon steel.

1. Low carbon steel C%≤0.25% Domestically known as A3 steel. Basically known abroad as 1008,1015,1018,1022 and so on. Mainly used for 4.8 bolts and 4 nuts, small screws and other products without hardness requirements. (Note: The drilling screw is mainly made of 1022 material.)

2. Medium carbon steel 0.25% <C% ≤ 0.45% Domestically known as No. 35 and No. 45 steels, and abroad basically referred to as 1035, CH38F, 1039, 40ACR, etc. Mainly used for 8 grade nuts, 8.8 bolts and 8.8 grade hexagonal products.

3, high carbon steel C%> 0.45%. Currently not used in the market

4, alloy steel: In the ordinary carbon steel alloy elements added to increase some of the special properties of steel: 35,40 chromium molybdenum, SCM435, 10B38. Fang Sheng screws mainly use SCM435 chromium molybdenum alloy steel, the main components are C, Si, Mn, P, S, Cr, Mo.


(b) Stainless steel. Performance level: 45, 50, 60, 70, 80

Mainly divided into austenite (18%Cr, 8%Ni) good heat resistance, good corrosion resistance, good weldability. A1, A2, A4

Martensite and 13% Cr have poor corrosion resistance, high strength, and good wear resistance. C1, C2, C4 ferritic stainless steel. 18%Cr has better forging properties and is more corrosion resistant than martensite. Currently imported materials in the market are mainly Japanese products. According to the grade mainly divided SUS302, SUS304, SUS316.

(c) Copper. Commonly used materials for brass ... zinc copper alloy. The market mainly uses H62, H65, H68 copper as standard parts.

Second, the use of carbon steel products:

TypeFastener Material Selection
Self-Cliching Fasteners12L14 1215 11L44(Such as B SO,DSO),SUS303,SUS304(CLS),10B21(FH HFH)
Brass NutsC3604,SUS303
8.8 grade hexgon bolts1035ACR(M10以下)1040ACR(M12以上)CH38F 1045ACR 1039 10B21 10B33 10B38
8.8 grade standoffsCH38F 1039 10B21(M10-M12) 10B33 (M14)10B38(M12-M24)10B21
10.9 grade Bolts1045ACR   10B38
12.9 grade35CrMo 40CrMo 42CrMo
│8│Grade Nuts1008K 1010
8 grade Cap nuts1015(M<16) CH38F (M≥16)
10 Grade cap nutsCH38F 1039 10B21 10B33
12 grade grade cap1039 10B21 10B33 10B38
Carriage screws1008 1010 1015
Hex flange boltCH38F 1039 10B21 10B33 10B38
Hexagonal wood screws
1008K  1010
Self-tapping screws and wallboard nails1018  1022  CH22A
Drilling nails, splint nails
Machine screws Furniture screws1008  1010