Quality_Handan Xiaojun Fastener Manufacturing Co.,Ltd

Quality: Control In Screw Quality

Core hardness: The core hardness of screws shall after heat treatment be between 270 HV 5 and 425 HV 5

Surface hardness: The surface hardness of screws shall after heat treatment be atleast 560 HV 0.3

Torque force: Thread diameter Minimum breaking
torque in Nm

M2.9 1.5

M3.5 2.8

M3.9 3.4

M4.2 4.5

M4.2 6.5

M5.5 10

M6.3 14

Case depth: Thread diameter Minimum Maximum

M2.9 to M3.5 0.05mm 0.18mm

M3.9 to M5.5 0.10mm 0.23mm

M6.3 0.15mm 0.28mm

+Catalog: Self Drilling Screws; Self Tapping Screws; Wood Screws; Concrete Screws

+Hot products: Torx Washer Head Knurled; Unslotted Hex Flange Head; Unslotted Hex Washer Head; Phillips Countersunk Head Hi-Low

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