#4-40 UNC Flat/Countersunk Head Socket Screws,100-Piece,Stainless Steel,Full Thread,Right Hand (#4-40 x 1/4") HZ Ltd

#4-40 UNC Flat/Countersunk Head Socket Screws,100-Piece,Stainless Steel,Full Thread,Right Hand (#4-40 x 1/4") HZ Ltd

  • #4-40 Flat Head Socket Screws,
  • Thread Dia.#4 Thread Count (TPI): 40
  • Driver type: Hex Key/Allen Key/Hex wrench/Hex Bit
  • Stainless Steel, Full Thread, Right Hand
  • #4 Countersunk Head Socket Machine Screws
Item # 70227

£5.01

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Size Name:#4-40 x 1/4"

Thread Diameter: #4
The flat/countersunk head socket screws are bolts designed to fit inside a countersunk hole. A countersink is both the recessed hole and the tool to make the hole that allows compatible screws and bolts to screw in flush to a surface. Flat/Countersunk head screwss are mostly hidden when screwed in, because their heads are shaped to fit within the special holes. When these holes are empty, they look like a normal screw hole with a conical opening at the top; when they are full, the only visible part should be the very top of the screw or bolt.The typical angle of a countersunk screw head is 90 degrees.
Screws Length= Head Height + Thread Length, e.g. M2 x 4mm flat head socket screw, the screws length is 4mm, head height is 1.4mm, thread length is 2.6mm.