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Sales Systems Limited Products and Services > Fasteners > Bolts / Screws > Tapping Screws > Thread Cutting Tapping Screws Type BF > Item # TCTSBF01900XXX  
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Item # TCTSBF01900XXX, Thread Cutting Tapping Screws Type BF, with 0.1900" Nominal Dia.

  • Points of screws shall be tapered and fluted or slotted as illustrated above for the respective types. The flute on Type BT screws shall have an included angle of 90º to 95º and the thread cutting edge located above the axis of screw. Tapered threads shall have unfinished crests, and the flutes or slots shall extend through first full form thread beyond taper except for Type BF screw son which tapered threads may be complete at manufacturer's option and flutes may be one pitch short of first full form thread. Other details of taper and flute design shall be optional with manufacturer, provided the screws meet the specified performance requirements.
  • The width of flat at crest of thread shall not exceed 0.004 in. for sizes up to and including No. 8, and 0.006 in. for larger sizes.
  • Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.

Manufacturer  · Specifications  · Codes and Standards  · Threads Per Inch



Industrial Fasteners Institute



Tapping Screws

Unit of Measure


Nominal Size or Basic Screw Dia.

No. 10

Nominal Size or Basic Screw Dia. (Decimal)

0.1900 in

Max. Major Dia. (D)

0.189 in

Min. Major Dia. (D)

0.182 in

Max. Minor Dia. (d)

0.141 in

Min. Minor Dia. (d)

0.135 in

Ref. Point Dia. (P)

0.130 in

Max. Point Taper Length (S)

0.125 in

Min. Point Taper Length (S)

0.094 in

Min. Practical Nominal Screw Lengths for 90º Heads (L)

5/16 in

Min. Practical Nominal Screw Lengths for Csk Heads (L)

3/8 in

Codes and Standards

Codes and Standards

ASME B18.6.4 1998

Threads Per Inch

Threads Per Inch



Type Designations for Tapping Screws and Metallic Drive Screws
(PDF, 206KB)

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