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Fastener Selection

With full in-house capabilities in design, tooling, manufacturing and surface treatments, Unisteel offers customized fastening solutions to meet customers' needs. To get the right fastener for your application, customers should consider the following areas:

  • Material
  • Screw Type
  • Head Type
  • Point Type
  • Fastening Drive System (Recess)

Material

Type Properties

Carbon Steel

Ideal for low to medium strength applications

  • Malleable
  • Good resistance to wear

Stainless Steel

Suitable for high strength applications.

  • Superior resistance to corrosion
  • Non-magnetic for austensitic stainless steel

UNITRONIC® &
CAMTRONIC®

Ideal for applications requiring superior resistance to galling.

  • Corrosion resistance on par with SUS 302
  • 40% harder than stainless steel
  • Improved mechanical perfomance with 30% higher torsional strength and seating torque
  • Lower liquid particle count (LPC) contamination for critical applications

Aluminium

Recommended for aluminium applications in order to minimize the danger of galvanic corrosion.

  • Lightweight
  • Non-magnetic
  • Resistance to atmospheric and chemical corrosion

Titanium

Ideal for applications where high strength and low weight are desirable.

  • Possesses high strength-to-weight radio
  • Non-magnetic
  • High shock tolerance
  • Low thermal expansion
  • Superior resistance to corrosion

Brass

Preferred material for threaded inserts.

  • Good corrosion resistance
  • High thermal conductivity

Plastic

Ideal for applications where high tensile holding strength is not a primary requirement.

  • Non-electrical conductivity
  • Non-magnetic
  • Lightweight

Screw Type

Type Properties

Machine Screw

Fastener that requires threaded holes.

Self-tapping Screw

Otherwise known as thread-forming screw, self-tapping screw is designed to cut threads while being driven into an un-tapped hole.

Cosmetic Screw

Screw is specially treated for aesthetic purposes. There are two types of finishes available-color coat and texturing.

Multi-blow Cold Formed Screw

Special formed component that is irregular in shape. It is usually produced using multi-stage machines.

Head Type


Pan Head
Pan Head With Collar
Hexagon Head
Bugle Head

Flat Countersunk Head
Button Head
Raised Countersunk Head
Hexagon Flange Head

Point Type


Chamfer Cut Point
Rolled Point
Radius Point
Cup Point

Cone Point
Dog Point
Drill Point
Taptite

Type AB
Type B
Type 17
Type 23

Type 25
Type U
Needle		  

Fastening Drive System (Recess)

TORX®
TORX® drive was developed to overcome the limitations of hex, cross recess, square and other drive systems.
Features Benefits

Straight, vertical sidewalls
  • Eliminates camout
  • Reduces fatigue and muscular stress during the manual assembly of fasteners
  • Recess completely encloses drive bit, minimizing tool slippage and damage to the fastener and surrounding surfaces

15° drive angle
  • Eliminates the radial forces that can cause stress on fastener recesses

Broad contact surface
  • Maximizes driver-fastener engagement, resulting in extended tool life
TORX® is the registered trademark of Acument Global Technologies
TORX PLUS®
An improved version of TORX® drive, TORX PLUS® drive has consistently outperformed every other drive system. Its longer tool life and optimal torque transfer have enhanced product reliability, increased productivity, and reduced total assembly costs on assembly lines in a multitude of industries around the world.
Features Benefits

Straight, vertical sidewalls
  • Eliminates camout
  • Reduces fatigue and muscular stress during the manual assembly of fasteners
  • Recess completely encloses drive bit, minimizing tool slippage and damage to the fastener and surrounding surfaces

Elliptically-based geometry
  • Maximizes driver-fastener engagement, resulting in extended tool life

0° drive angle
  • Eliminates the radial forces that can cause stress on fastener recesses
TORX PLUS® is the registered trademark of Acument Global Technologies
TOTSUPURA®
A newly designed cross recess drive for fasteners that prevents screw tightening errors, stabilizes quality, improves productivity and reduces production costs.
Features Benefits

Cross shaped with near-
straight wall
  • Eliminates camout
  • Reduces fatigue and muscular stress during the manual assembly of fasteners

Wide recess wing width
  • Increases tool engagement, resulting in extended tool life
  • Improves torque transmission

Wide drive area
  • Screw driving force per unit area is small, preventing damage to the recess
TOTSUPURA® is the registered trademark of HIOS Inc

OTHERS


In addition to the above mentioned, Unisteel also offers JCIS Cross. Other recesses are also available upon request.