DIN6921 Zinc Plated Hex Flange Bolt

Company Description:

Dongguan King Tower Hardware Co., Ltd. is one of the largest enterprises to produce tight firmware in Mainland China. Our company produces all kinds of DRYWALL SCREWS, SELF-TAPPING SCREWS, CHIPBOARD SCREWS, WOOD SCREWS, MACHINE SCREWS and professional SCREWS, to meet various standard requests from different countries. All the equipment is introduced from the United States, Japan and Taiwan. Good equipment, consummate craft and strict management enable the quality of the products and service standard to reach the level of international market.

Production equipment :

With various types of multi-station forging forming machine, two-mode four-stroke machine, hollow rivet machine, thread rolling machine, CNC lathe, program-controlled precision lathe, precision drilling, precision grinding, milling, general automatic lathe, rachis, stainless steel high-temperature heat treatment furnaces and other equipment, we can processing Metric, BS, ANSI fasteners and non-standard shaped products which their diameters ranging from 1mm to 10mm, and length 2mm to 100mm.Stainless steel raw materials use 302HQ, 304HC, 304M, 316C, 316L, XM7 and dozens of imported stainless steel to ensure the products can meet the A2, 70; A2-80 and A4-80 performance requirements and high anti-rust ability. Through anti-rust treatment, stainless steel products can last more than 72 hours in the salt spray test, even up to 1000 hours. Dozens of imports of carbon steel raw materials are made of SWRCH22A, SWRCH18A, SWRCH15A, SWRCH10A, SWRCH8A, SWRCH6A, SWRCH35K, SWRCH45K, ML08AL, ML40CR, XGM6, 10B21, 10B33, SCM435, 30GrMnTi, ML20MnTiB, 50BV30, 20CrMo, GCr15, CH1T, Q195LY etc. so that products can meet the Grade 4.8, Grade 8.8, Grade 10.9, Grade 12.9 product requirements and the requirements of high-strength productions.

Testing instruments: 

To ensure the quality and performance of the manufacturing, our company is equipped with all kinds of professional testing equipment: universal testing machine, hardness tester, torque, metallographic analyzer, projectors, imager, and salt spray test machine and so on. Professional inspection: digital micrometer, inside and outside diameter micrometer, a micrometer head, triangular thread odd micrometer, a few significant vernier caliper, thread ring gauges and thread plug gauge and other professional testing equipment.