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Hot Cold formed and Bright turned
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HOT FORGED --- COLD FORMED --- TURNED BOLTS NUTS SCREWS
Bright Turned
Matford
J Cooke
Smith Bullough
Non Standard
Cold Form
Mohindra Fasteners
Bon Accord
Trojan Special
Cooper & Turner
Cooper & Turner
Non Standard
EKP screws
Hot Forged
Smith Bullough
Universal Precision
HOT FORGED

Hot forged fasteners include:

hot forged hexagon bolts

hot forged hex set screws

hot forged socket cap screws

hot forged eye bolts

hot forged bolt blanks

To M52 (2") Diameter.

Length up to 900mm (36").

Bolts large heads

hot forged square head Bolts

hot forged cup square hexagon bolts

hot forged cup round hexagon bolts

Csk countersunk square bolts

hot forged plough bolts

Square square hexagon holding down bolts

hot forged cup nib bolts

hot forged csk countersunk nib bolts

hot forged indented foundation bolts

hot forged T bolts

hot forged petrochemical bolts, nuts, studbolts

Class 4.6, 8.8, 10.9, 12.9 & 14.9

hot forged Inch grades,

Exotic materials, Super Duplex, Monel, Inconel

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COLD FORMED

Cold heading is basically putting metal in a die and hammering it and is different to hot forging where the metal is heated before (hammering) forming. Cold heading and other methods of cold forming cause the metal to deform at room temperature. 

Modern cold-forming machines also called headers or parts formers, provide from one to seven die stations, opposite a similar number of punches mounted on a slide, which frequently moves horizontally. The method used for making bolts or screws is the one-die, two-blow header. This has one die, which is the diameter of the shank of the bolt or screw being formed. The material in the die is struck with two different punches, one after the other. There is a limit to how much you can deform the metal with a single blow; two or more hits are necessary to create the correct shape of the bolt head. 

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BRIGHT TURNED

Bar turned Bright fasteners have moved from the 19th and into the 21st century with the introduction of CNC machines capable of producing a turned product with speed. There are still fastener companies turning fasteners on lathes, meeting demand for very low volume. CNC machines are capable of rapidly producing intricate turned parts by a mixture of Screwing, Turning, Milling and Grinding.

Bright turned fasteners are still required when: 

Cold forging volumes are too high.

Hot forging scale is not acceptable.

Where extra precision is required.

If the fastener is too large for forging or forming.

Where special dimensions or tolerances are required

When someone forgot to update the 19th-century drawing. 

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