They're beveled under the head for use in countersunk holes. Screws penetrate 0.025" and thinner sheet metal.
This head is designed to sit flush with the surface of the material it is binding.A characteristic of flat head screws is the cone shaped bearing surface under the head.The general angle of this bevel is 82°in the Unified System and 90° in the Metric System.
Length is measured from the top of the head.
Product Drawings:
Cross recessed countersunk head self-tapping screws | ||||||||||
ISO7050&GB/T 846-1985 | ||||||||||
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d(mm) | ST2.2 | ST2.9 | ST3.5 | ST4.2 | ST4.8 | ST5.5 | ST6.3 | ST8 | ST9.5 | |
P(mm) | 0.8 | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | 2.1 | 2.1 | |
dk(mm) | min | 3.5 | 5.2 | 6.9 | 8 | 8.9 | 9.9 | 10.9 | 15.4 | 17.8 |
max | 3.8 | 5.5 | 7.3 | 8.4 | 9.3 | 10.3 | 11.3 | 15.8 | 18.3 | |
k(mm) | max | 1.1 | 1.7 | 2.35 | 2.6 | 2.8 | 3 | 3.15 | 4.65 | 5.25 |
Recessed NO. | 0 | 1 | 2 | 3 | 4 |
Production Workshop:
Packing:
FAQ
A: We are factory and OEM are available.
A: Generally it is 2-5 days if the goods are in stock,or it is 15-30 days if the goods are not in stock, it is according to quantity.
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
A: 30% T/T in advance ,balance before shipment or L/C.
If you have another question, please feel free to contact us.