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Technical Library

   Overview
 Hex and Star Fasteners:
   Hex and Star Fasteners
 Torque/interchangeability:
   Torque Calculation
   Torque and Screw
Interchangeability
 Competitor Comparisons:
   Torque Comparison
   2mm Strength Demo
   T-Handle Comparisons
   L-Wrench Comparisons
   Salt Spray Comparisons

 Hex and Star Fasteners

The fasteners used with hex tools are available in an incredibly wide range of sizes and strengths, and with features unique to the various types.  Hex fasteners are available for nearly any assembly project where critical factors will not permit the use of lower quality alternative fasteners.
 
Common screw types

Socket Head Cap Screw		 Uses: Applications where maximum strength is required.  Used as protruding or counter bored.
Low Head Socket Head Cap Screw		 Uses:Applications where parts are not thick enough to be counterbored or clearance is too limited to use full height cap screw.
Variations: A range of choices available for special use applications:  
  • High temperature
  • Corrosive environments
  • Maximum tensile strength critical
  • Cleanliness required
    

Shoulder screw		 Uses: Applications where the shoulder screw can actually replace more expensive parts such as trunnion mountings, shafts, or guides.  
Shoulder screw		 Uses: Applications with low limited clearance:  parts are not thick enough to be counterbored; loading capacity is not critical.

Shoulder screw		 Uses: Applications where head needs to be flush with surface.  
Socket Set Screw		 Uses: Fastening parts on a shaft – pulleys, gears, collars, etc.
      Variations: Options include:
     
  • High temperature applications
  • Corrosive environments
  • Range of points available to accommodate:  shafts of varying hardness; parts needing frequent adjustment or removal; applications where positive locking critical.

Advantages of Socket Head Screws

Strength: An assembly with three socket head cap screws has more strength than one with five equivalent hex head screws.

Savings: Using fewer screws means labor savings associated with drilling fewer holes and installing fewer screws.

Tensile, yield, and shear strength: An assembly done with a cap screw has over 50% more tensile strength, 100% better yield strength, and over 30% more shear strength.

Clearance: Socket head cap screws have no side clearance restrictions associated with the sockets and wrenches used with hex head screws. As a result, they can be placed closer together, and used in applications where associated side clearance would make hex head screws impractical.

When overhead clearance is an issue, or a flush profile is necessary, the low head and flat head versions are a good solution.

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