High Carbon (Spring) Steel

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SL : Low tensile static
DM : Medium tensile dynamic
SM : Medium tensile static
DH : High tensile dynamic
SH : High tensile static

European Grade Designations and Chemical Composition Header

EN 10270-1 : 2001 C (a) Si Mn (b) P (max) S (max) Cu (max)
SL, SM, SH 0.35 – 1.00 0.10 – 0.30 0.50 – 1.20 0.035 0.035 0.2
DM, DH 0.45 – 1.00 0.10 – 0.30 0.50 – 1.20 0.02 0.025 0.12
(a) A wide range is stipulated to accommodate the whole range of sizes. For individual sizes, the carbon range is substantially more restricted.
(b) The range of manganese content is wide to cope with various processing situations and the broad size range. The actual figures per size small be more restricted.

NS : Normal duty static
ND : Normal duty dynamic
HS : High duty static
HD : High duty dynamic
M  : High duty static and dynamic (music grade)

British Grade Designations and Chemical Composition Header

BS 5216 : 1991 C Si (max) Mn P (max) S (max)
NS, HS 0.35 – 0.85 0.35 0.40 – 1.00 0.05 0.05
ND, HD 0.45 – 0.85 0.35 0.30 – 1.00 0.03 0.03
M 0.60 – 1.00 0.35 0.25 – 0.75 0.03 0.03

SL : Low tensile static
M  : High duty static and dynamic (music grade)
SM : Medium tensile static
DM : Medium tensile dynamic
SH : High tensile static
DH : High tensile dynamic
NS : Normal duty static
ND : Normal duty dynamic
HS : High duty static
HD : High duty dynamic

Service Properties - High Carbon Steel

EN 10270-1 : 2001 BS 5216 : 1991 Service Properties Applications
SL NS Tension, compression or torsion springs subjected to low static stress. Magazine binding wires, hangers, staples.
SM   Tension, compression or torsion springs subjected to medium high static stresses or rarely to dynamic stresses. Binding wires, springs, circlips.
DM ND Tension, compression or torsion springs which are subjected to medium high dynamic stresses. Also for wire forms which require severe bending. Circlips, wire rope, lock levers.
SH HS Tension, compression or torsion springs which are subjected to high static stresses or slightly dynamic stresses. Tyre cord reinforcement,
DH HD Tension, compression or torsion springs or wire forms which are subjected to high static stresses or medium level dynamic stresses. Helical springs, compression springs.
  Tension, compression or torsion springs or wire forms which are subjected to high static and dynamic stresses. Small springs, piano strings, cutting wires.

Wire Stockists

Knight Precision Wire is part of Knight Group, a group of companies that specialise in the processing and supply of precision metals. Quality is of the utmost importance and Knight Precision Wire operates a vigorous quality management system.

People outside the wire industry may be unaware of the sheer number of wire variations out there. Wire is an essential commodity in numerous sectors and appears in many different forms. Sectors that KPW supply wire for include the Aerospace, Medical, Petrochemical, Industrial and Heat Treatment industries. For the aerospace sector, KPW have been approved as aerospace wire suppliers by Rolls Royce, British Aerospace and Westlands. Two of the primary products supplied to the aerospace industry are locking wire and aerospace cable. You can see case study examples of how the services provided by KPW have benefited the different sectors on the website.

Below is a list of the different wire products offered by KPW :

  • Stainless Steel
  • Carbon Steel
  • Nickel & Nickel Alloys
  • Copper & Copper Alloys
  • Special Wire Materials

Visit the stainless wire product page to see more information about the different stainless wires we produce. To see all of KPW's steel wires products then visit the products page.

In addition to providing wire products to many different companies and sectors, KPW also offer wire processing services. These services include :

  • Cut to Length Wire
  • Flat Wire
  • Square and Shaped Wire
  • Stranding and Bunching
  • Rewinding and Spooling
  • Polishing & Cleaning

To find out how KPW can help you with your special wire needs, send an enquiry using the form on the contact page.