Thumb Screw

Thumb Screw Machine Thread / 45 years of experiences for production stainless steel fasteners.

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Thumb Screw | Screw Manufacturing for 50 Years | Sen Chang

Sen Chang Industrial Co., Ltd., since 1968, is a Thumb Screw | 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.

Thumb Screw


Process: Threading 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
Measurement Points: Head diameter, Head height, Outside diameter and height of flat head under head, Total length, Grip gaging body diameter, Length of rolling, Major diameter, Thread angle, Pitch, Ring gage


  • Partially Threaded Machine Thread
  • 110 Vertical Lines on the Side of the Head
  • Flat Head under Head


  • Item Specification: #8-32x3/8"
  • Available Material: 302HQ 304SS 305SS 316SS 410SS 420SS 430SS

Available Product

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