Indented Hex Bolt

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Indented Hex Bolt | Screw Manufacturing for 50 Years | Sen Chang

Sen Chang Industrial Co., Ltd., since 1968, is a Indented Hex Bolt | CE certified screw manufacturer based in Taiwan.

ISO 9001 certified self tapping screw production processes and stainless steel screws and bolts with meticulous quality control. Screws and bolts including Machine Screws, Tapping Screws, SEMS Screws, Coating Screws and High Tensile Screws.

Sen Chang has been supplying nuts and bolts to customers, both with advanced technology and 48 years of experience, Sen Chang ensures each customer's demands are met.

Indented Hex Bolt

Process: Head formation before threading, and then acid washing
All the items are inspected during the process and before shipping, complying with ISO Working Instruction
Inspection Tools: Calipers, Protrusion-height gage, Micrometer, 2.5D and 2D projector
Measurement Points: Head diameter, Head height, Across the flat and corner of the hex, Hex Rec depth, Hex plug gauge, Total length, Thread length, Major diameter, Minor diameter, Thread angle, Pitch, Ring gage GO /NO GO


  • Head Formation Complying w/ DIN933
  • Internal Hex Socket
  • DIN6902A Washer under Head
  • 70kgf/mm2 Tensile Strength


  • Item Specification: M5*66
  • Item Material: 18-8SS