c Phil-Slot:.. word / Phillips d Hex Socket: Hexagon e One Way:. unidirectional (may only be locked in, not exit) A-4: Head Code / head shape .a Flat:. flathead (after lock into the top flush with the work piece) b Oval:. salad head, O head, countersunk head c Round:. Round d Pan:. round flat head stainless steel nuts. Screws 316L, 316 L screws, bolts 316 e Truss:. Great circle flat head, stainless steel screws, stainless steel screws, f Hex:. Hex head .A-5: Finish Code / exterior treatment metric self-tapping screws: direct marking on the rear name Tapping Type.Ex: M3 x 6 -PPB, Tapping Type: M3 self-tapping screws, 6mm long, cross, round flat head, black-plated products generally do not or labeled Zibo stainless steel hole with a ring, and then determine the Sheet Metal or. the use of plastic parts. *** teeth is the number of threads per inch. *** marked in inches, shall be multiplied by 25.40 conversion is mm. with a buckle gauge the amount of tooth stapler and metric metric thread, inch thread coincide with the British thread. You can also use calipers amount of thread diameter, and pitch. Metric thread diameter is millimeters, such as stainless steel 6,8,10,12 Qingdao hole with a ring, 18 and 20 mm, and so is the pitch in millimeters, such as stainless steel holes at 0.5 Tai'an Collar, 2, 3, etc. inch thread diameter in inches as a unit, (equal to 25.4 mm per inch) as 3 / 16,5 / 8,1 / 4 hole with a ring of stainless steel, 1/2, etc. Therefore, the outer diameter of the decimal metric calipers often with irregular readings. Stainless steel screws, stainless steel bolts, stainless steel cotter pin, screw 304 316 316 screw holes with stainless steel screws Zibo ring, stainless steel hole with a ring, Jinan Road ground is provided by Jinan Daoqin Trading Company. Jinan Daoqin Trading Company (www.daoqinshangmao.com) (www.daoqinshangmao.com) strong, credible, in Jinan, Shandong hardware accessories industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Jinan Road ground into the brilliant and you work for a better future!