Indented Hex Washer Head | Precision Machine Screws for Secure Fastening in Industrial Applications | Sen Chang

Indented Hex Washer Head With Slotted Recess Thread Rolling Screw | Innovative Coating Screws: Combining Aesthetics with Corrosion Resistance

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Indented Hex Washer Head | Taiwan High Tensile Screws: The Backbone of Durability in Fastener Technology | Sen Chang

Located in Taiwan since 1968, Sen Chang Industrial Co., Ltd. has been a renowned manufacturer in the fasteners industry, especially in producing high-quality stainless steel wires and various screws like Indented Hex Washer Head, machine screws, tapping screws, and high tensile screws. Their commitment to quality is evident in their adherence to ISO9001 standards, ensuring each fastener meets rigorous quality control.

With a rich heritage in fastener manufacturing, Sen Chang specializes in both standard and custom-made solutions, catering to diverse industrial needs. Utilizing top-grade materials from renowned steelworks and cutting-edge manufacturing technologies, Sen Chang produces fasteners with unparalleled tensile strength, setting industry benchmarks. Their rigorous adherence to ISO9001 standards ensures that each product meets the highest quality and durability criteria.

Sen Chang has been supplying customs high tensile strength screws and fasteners, both with advanced technology and 48 years of experience, Sen Chang ensures each customer's demands are met.

Indented Hex Washer Head


Process: Using multi blow headers to make the head then threading before passivation
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: Across flat, Across corner, Head height, Washer diameter, Washer height, Slot width, Slot depth, Thread length, Diameter of Circumscribing, Circle Measurement, Across Center, Minor diameter, Thread angle, Pitch, Ring gage GO/NO GO


  • 305 SS
  • Indented Hex Washer Head
  • Slotted on the head
  • Thread Rolling Screw


  • Item Specification: 1/4-20*1
  • Item Material: 305 SS