A: Metric screw B: American screw C: Imperial screw A: Metric machine screw: Metric Ex: M3 x 6 – PPB: M3 Machine screw, 6mm long, cross, round flat, black finish. Finish Code: Appearance processing specifications Head Code: Head Thread Code Screw Type Drive Code: Head Groove, Feature Model Length Code: Screw Length (mm) A-1: Thread Code: Screw Type Metric Screws directly indicate the screw type with screw outside diameter, eg M3 is the outer diameter of the screw is 3.00mm.; M4 is the outer diameter of the screw is 4.00mm. Metric Thread Size x Pitch: Note: The metric screw is behind the screw model, sometimes the screw pitch is indicated. Such as M3x0.5, M4x0.70 , M5x0.8 , M6x1. However, because of the standard specification, it is usually not mentioned. A-2: Length Code: Screw length: Metric screw, direct marking screw length in mm. Total length of the screw marked, only calculating head below Length, without head height. With the exception of grub screws, the total length of the screw indicates the height of the head. A-3: Drive Code/ Head Ditch, features.
P refers to the PAN head; A refers to the end of the finger, B refers to the flat tail, that is, the PA round head steel teeth, PB round head flat steel teeth. Self-tapping: ◆ Round head self-tapping screws PA ◆ Round head flat tail tapping screws PB ◆ Round head tail tapping screws PT ◆ Round head with self tapping screws PWA ◆ Round head with flat tail tapping PWB ◆ Round head belt Self-tapping PWT from the cutting end ◆ Countersunk head tapping screws KA ◆ Self-tapping screws from Shentou Pingtail KB ◆ Self-tapping screws from countersunk heads KT ◆ Semi-sinking tapping screws OA ◆ Bulk-head tapping screws BA ◆ Bulk-head flat tapping screws BB ◆Big flat tapping screws TA ◆Big flat head tapping screws TB ◆Big flat head tapping screws TT ◆Thin tapping screws CA ◆Thin flat tail tapping screws CB ◆Cup heads Self tapping HA ◆ drywall nails / wallboard nails / staple fiber yarn::: ◆ round head screw PM ◆ round head with interdental screw PWM ◆ big flat head screw ◆ countersunk head screw KM ◆ Semi countersunk head screw OM ◆ Big head screw BM ◆ Thin head screw CM ◆ Cup head screw HM