• 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.
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Unit of Measure
Items
Types BT

Thread Cutting Tapping Screws Type BT, with 0.0600" Nominal Dia.
Types BT

Thread Cutting Tapping Screws Type BT, with 0.0730" Nominal Dia.
Types BT

Thread Cutting Tapping Screws Type BT, with 0.0860" Nominal Dia.
Types BT

Thread Cutting Tapping Screws Type BT, with 0.0990" Nominal Dia.
Types BT

Thread Cutting Tapping Screws Type BT, with 0.1120" Nominal Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Tapping Screws
Codes and Standards N/A ASME B18.6.4 1998
Unit of Measure N/A English
Nominal Size or Basic Screw Dia. N/A No. 0 N/A No. 1 N/A No. 2 N/A No. 3 N/A No. 4
Nominal Size or Basic Screw Dia. (Decimal) N/A 0.0600 in N/A 0.0730 in N/A 0.0860 in N/A 0.0990 in N/A 0.1120 in
Threads Per Inch N/A 48 N/A 42 N/A 32 N/A 28 N/A 24
Max. Major Dia. (D) N/A 0.060 in N/A 0.075 in N/A 0.088 in N/A 0.101 in N/A 0.114 in
Min. Major Dia. (D) N/A 0.054 in N/A 0.069 in N/A 0.082 in N/A 0.095 in N/A 0.108 in
Max. Minor Dia. (d) N/A 0.036 in N/A 0.049 in N/A 0.064 in N/A 0.075 in N/A 0.086 in
Min. Minor Dia. (d) N/A 0.033 in N/A 0.046 in N/A 0.060 in N/A 0.071 in N/A 0.082 in
Ref. Point Dia. (P) N/A 0.031 in N/A 0.044 in N/A 0.058 in N/A 0.068 in N/A 0.079 in
Max. Point Taper Length (S) N/A 0.042 in N/A 0.048 in N/A 0.062 in N/A 0.071 in N/A 0.083 in
Min. Point Taper Length (S) N/A 0.031 in N/A 0.036 in N/A 0.047 in N/A 0.054 in N/A 0.063 in
Min. Practical Nominal Screw Lengths for 90º Heads (L) N/A 1/8 in N/A 1/8 in N/A 5/32 in N/A 3/16 in N/A 3/16 in
Min. Practical Nominal Screw Lengths for Csk Heads (L) N/A 1/8 in N/A 5/32 in N/A 3/16 in N/A 7/32 in N/A 1/4 in
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