This spiral flute tap is made of high speed steel and has a 0.255 inch diameter, 4½ inch long shank. It is designed for use with stainless steel/steel, and meets the standards for ANSI. This 398 series spiral flute tap has an oxide finish, and has fractional inch measurements. It is non-coolant through, has right hand direction with a six-inch length. Plus it has three flutes.
Technical Specs
ItemSpiral Flute Tap
Thread StandardUNF
Overall Length6 in
75% Thread Drill Size5.45 mm
Thread DirectionRight Hand
55% Thread Drill Size5.70 mm
Coolant FedNon-Coolant Through
Measurement SystemFractional Inch
Primary Material Application ISO CodeM, P
Shank Dia.0.255 in
Square Size0.1910 in
Tap ChamferModified Bottoming
Tap MaterialHigh Speed Steel
Tap StyleSpiral Flute
Helix Angle30 Degrees
Thread Size1/4"-28
Tap FinishOxide
Thread Length1 1/2 in
Thread LimitH3
Number of Flutes3
65% Thread Drill Size7/32 in
Extended NeckYes
Primary Material ApplicationStainless Steel, Steel