Thread styles(Major thread styles. Please ask for other thread styles not in this table.)

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Thread style Application Characteristics Side view Cross section
Original product
P-TEC
PDF 63.2KB
Tapping screw for non plastic materials Mating material pushed out by thread moves into twin circular grooves on shank for tight-fit/anti-loosening assembly.
Can be used for Aluminum and Magnesium.
(Hole size control is necessary for maximum result.)
DIA screw
DS
PDF To be added
Can be used as alternative for metric coarse thread. Anti-loosening effect from the unique profile
Good for repetitive use.
Metric coarse thread
(MS)
For nuts and inserts Most commonly used thread. Also called "machine screw".
Metric fine thread Application that require fine adjustment. Closer pitch than metric coarse thread.
Unify thread For HDD and others Developed for military industry oversea.
Inch based specification.
To be added To be added
JIS tapping screw
(Type 1 & 4)
Tapping screw Self tap the mating hole during tightening.
Type 1 has positive, and type 4 has negative tolerances against nominal diameter.
Tapping screw
(Type 2)
Tapping screw Its wider pitch allows faster installment.
Tapping screw
(Type 2) shank slotted
Tapping screw Slotted thread end allows easier self-tap by cutting mating material as it drives in.
Tapping screw
(Type 3)
Tapping screw
triangular tapping screw
(Type S)
Tapping screw for steel Has same pitch with metric coarse thread.
triangular tapping screw
(Type B)
tapping screw for steel and plastic. Has wider pitch than triangular tapping screw (type S).
triangular tapping screw
(Type P)
Tapping screw for plastic Has twin threads which has wider pitch than triangular tapping screw (type B).
Fast installation
Special tapping screw
(Type F)
Tapping screw Anti-loosening effect from the unique profile
Cross section is square for below M2, and hexagon for M2 and above.

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