CNS 4557-1981 Hexagon Socket Head Cap Screws Shallow Head with Pilot Recess for Wrench Key《六角承窝短头螺钉（具六角杆扳手导孔者）》.pdf

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CNS 4556-1981 Hexagon Socket Head Cap Screws with Reduced Height of Head《六角承窝短头螺钉》.pdf

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