Custom Female Nail

Custom Female Nail, Serration under Head / 45 years of experiences for production stainless steel fasteners.

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Custom Female Nail | Screw Manufacturing for 50 Years | Sen Chang

Sen Chang Industrial Co., Ltd., since 1968, is a Custom Female Nail | 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.

Custom Female Nail


Process: Skiving after head formation, and acid washing being the last step
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, Pin gage
Measurement Points: Head diameter, Head height, Body diameter, Serration diameter, Serration length, Total length, Serration depth, Serration diameter


  • 29 Serration under Head
  • Internal Tapping
  • Skived Diameter of Head


  • Item Specification: 1/4-20*1.19"
  • Available Material: 302HQ 303SS 304SS 305SS 316SS 410SS 420SS 430SS

Available Product

  • Head Diameter M1.6~M16/#00~#5/8
  • Length 1/8”~12”/3.175mm~600mm