M2.5, Countersink (CSK), Socket Screw (12.9).

M2.5, Countersink (CSK), Socket Screw/ Allen Bolt, High Tensile (10.9), DIN 7991. Here at Fixaball, we stock all sizes and lengths at the best internet prices and free delivery Orders...
£3.67

M2.5, Countersink (CSK), Socket Screw/ Allen Bolt, High Tensile (10.9), DIN 7991.

Here at Fixaball, we stock all sizes and lengths at the best internet prices and free delivery

Orders placed before 2pm are usually dispatched same day (Mon-Fri).

The, ‘Socket Screw/ Allen Bolt,’ term is used to describe a fastener that is partially threaded in lengths over 1 inch. This space of unthreaded area confirms that the fastener is a bolt. Some engineers may call them screws if the person only uses the shorter length range of sizes, under an inch. ‘Socket,’ refers to the hexagon shaped indentation found on the top of the fasteners’ head. Here, you can use a hexagon key (Allen Key) to tighten and loosen the fastener.

Metric Coarse and Metric Fine

Are in Millimetre (mm) units and were developed to simplify the imperial systems. Europe moved to this system but the Americans choose Imperial as their default. A coarse thread has less helical coils per mm and a fine one has more. Coarse is used for heavier loads and fine is used for lighter loads prone to vibrations.

Our socket screws are available in the following materials:

 

Material/ Finish

Appearance

Level of Corrosion Resistance

Typical Application

High Tensile Steel

Self-Colour (black with no surface treatment)

Low, without further surface treatment

  • No exposure to moisture
  • Often Greased/ Oilied

High Tensile Steel - Zinc

Bright Shine – Blue to Yellow

Internal

  • Low exposure to moisture

High Tensile Steel -Galvanised

Textured, several dull, metallic tones

External

  • Constant Weathering
  • Chemical exposure
  • Frequent Wear

A2 Stainless Steel

Dull Shine

External

  • Intermittent weathering
  • Hygiene

A4 Stainless Steel

Dull Shine

External

  • Constant Weathering
  • Chemical exposure
  • Frequent Wear

 

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