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304 stainless steel countersunk head, flat head six corners screw bolt [M12*16-M12*90] 5 grain

price:USD$34.50
discount 70% in 2018-09-22 to 2018-09-24
price: USD$ 24.15
freight :USD$18.00,(Express)
freight :USD$7.00,(Postal parcel)
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DIN934-1
There are positive and negative tolerances, especially the attention of the beat, screw reference specifications by D*L (diameter * total length) nut to the matching screw diameter is prevailSetting: mm
Nominal diameter M3 M4 M5 M6 M8 M10 M12 M14 M16 M18 M20
pitch 0.5 0.7 0.8 1 1.25 1.5 1.75 2 2 2.5 2.5
dk max 6 8 10 12 16 20 24 27 30 33 36
min 5.7 7.64 9.64 11.57 15.57 19.48 23.48 26.48 29.48 32.38 35.38
S nominal 2 2.5 3 4 5 6 8 10 10 12 12
max 2.1 2.6 3.1 4.12 5.14 6.14 6.175 10.175 10.175 12.212 12.212
min 2.02 2.52 3.02 4.02 5.02 6.02 8.025 10.025 10.025 12.032 12.032
t max 1.2 1.8 2.3 2.5 3.5 4.4 4.6 4.8 5.3 5.5 5.9
min 0.95 1.55 2.05 2.25 3.2 4.1 4.3 4.5 5 5.2 5.6
a max 92°
min 90°

 

Chemical composition,%, Max
group C Si Mn P S Cr Mo Ni Cu Characteristic
304-A2 0.1 1 2 0.05 0.03 15-20   8-19 4

The work hardening rate is moderate, suitable for general cold room processing and stretching, cold processing performance is good, widely used in the outer six corners screw, nut and washer products

316-A4 0.08 1 2 0.045 0.03 16-18.5 2-3 10-15 1

With molybdenum, the corrosion resistance is better than 304, especially suitable for seawater and chemical media, more corrosion resistance and pitting resistance.

Note:

1) if the content of nickel is less than 8%, the minimum content of manganese must be 5%
2) the minimum content of copper is not limited when the nickel content is greater than 8%
3) when the chromium content is below 17%, the minimum content of nickel is 12%
4) for the austenitic stainless steel with the largest carbon content of 0.03%, the nitrogen content can reach 0.22
5) for larger diameter products, in order to achieve the specified mechanical properties, in the manufacturer's manual, there may be a higher carbon content, but the martensitic steel should not exceed 0.12%

Mechanical properties
category group Performance grade Screw nominal diameter Tensile strength mpa/mm2 Non proportional elongation should be mpa/mm2 After the elongation of mpa/mm2
austenite A2,A4 50

≤ 39

500 210 0.6d
70

≤ 24

700 450 0.4d
80

≤ 24

800 600 0.3d