Wallboard nails
1. Heart hardness: Standard: HRC24-45.
2. Surface hardness: standard: HV600-800.
3. Carburized layer: 4#-6#0.05-0.18mm, 8#-12#0.10-0.23, 14#0.13-0.28.
4. Curvature: 150-450 required
5. Salt spray test: generally MIN48h.
6. Torque: Specification 6#7#8#10# Torque 21283558.
Self-drilling screw
1. Heart hardness: Standard: HRC32-40 Our company's product is actually HRC31.7-39.0.
2. Surface hardness: Standard: HV600-700 Our company's product is measured to be about HV620.
3. Hard layer: 4#-6#: 0.05-0.18mm8#-12#: 0.10-0.23mm14#: 0.15-0.28mm
4. Torque: specifications, tail drilling, screws, TYPEBSDTYPECSDINCH-LBKG-CMINCH-LBKG-CM4#（2.9）141614166#（3.5）242824288#（4.2）4248485510#（4.8）6170657512#（5.5）9210610011514#（6.3）150173156180 .
1. Heart hardness: standard value HRC28-38. The test is carried out on a section 1-2 times the nominal diameter from the tail. If the nominal length is too short, it can be embedded first, and then the hardness is measured.
2. Surface hardness: standard MINHV450.
3. Carburized layer: standard 4#-6#: 0.05-0.18mm, 8#-12#: 0.10-0.23mm, 14#: 0.13-0.28mm. The main purpose of carburization is to increase the surface hardness and ensure the strength of the teeth. If the decarburization is too deep and the carburization is insufficient, the strength of the teeth will not meet the requirements, that is, the teeth will be damaged during the screwing test.
4. Torque: standard specification 4#5#6#7#8#10#12#14#A tooth 14212835455696145AB tooth 142128354565102165.
