Suzuki SP Wire for Wire-EDM

SP Strong like tungsten
Conductive like Brass
Less Cost
Available from 0.03mm

SP wire is a hybrid electrode wire consisting of a high-strength core and highly-conductive outer shell, combining the advantages of tungsten-wire electrodes and brass-wire electrodes.
This is achieved by applying our many years of experience in fine wire technology and metal plating skills.
With its excellent tensile strength and ED characteristics, SP wire replaces conventional tungsten wire for precision ED wire cutting.

SP Wire Structure and Specifications

SP Wire Structure and Wire Geometry

SP Wire Specifications

Wire OD
OD tolerance
Tensile strength
Outer shell
thickness (avg)
(micro m)
SP30S 0.03 +0.000


2160=.< 1.5 13=.<
SP40S 0.04 2.0
SP50S 0.05 2.5
SP60S 0.06 3.0
SP70S 0.07 3.5
SP80S 0.08 4.0
SP100S 0.10 +0.000


1960=.< 5.0


SP Wire Length/Reel and Reel Dimensions

Length/reel(m) Product
Type of reel Reel dimensions(mm)
Flange Barrel Traverse Total
20,000 SP100S – SP50S Type A 130 80 90 110 20
10,000 SP100S – SP40S Type A 130 80 90 110 20
5,000 SP100S – SP30S Type A 130 80 90 110 20
5,000 SP100S – SP30S Type B 130 60 30 37 13


SP Wire Cutting Characteristics and Performance

ED Cutting Performance of SP Wire


  1. Cutting speed
    Improvement of ≥10% over tungsten wire, thanks to SP wire’s high electrical conductivity.
  2. Surface roughness
    Due to its excellent ED stability and high tensile strength, SP provides a fine surface roughness as good or better than that of brass wire.
  3. Cutting width (clearance)
    With its high tensile strength and stable ED characteristics, SP wire provides precise, fine ED cutting where the cutting width (clearance)is ≥20% narrower and the corner radius is smaller than that with tungsten wire. Thus, the same machining accuracy can be obtained with one size larger SP wire, along with a much faster cutting speed.
  4. Abrasion of wire guides
    Since SP wire is flexible and has a soft and smooth surface, abrasion of the wire guides (electrified pins, guide rollers, etc.) of ED machines is far less than that with tungsten wire, reducing operating costs.
  5. Automatic wire joining
    SP wire has excellent free cast and straightness, allowing a high rate of automatic wire joining.
  6. Longer continuous length
    SP wire provides a longer continuous length per reel: 5,000m/reel, 10,000m/reel and 20,000m/reel, while that of tungsten wire is 3,000 – 5,000m/reel. Thus, longer continuous operation and higher productivity can be achieved.
  7. Surface stability
    Unlike tungsten wire, SP wire is invulnerable to surface oxidation. Remaining wire can therefore be used again easily.
  8. HOMO phenomenon
    The HOMO phenomenon, an unstable ED caused by the short-circuit, that occurs when cutting a tungsten-containing work piece (e.g., tungsten carbide) with a tungsten wore, does not occur with SP wire.
  9. Cost performance
    In addition to the excellent properties above, SP wire is far less expensive than tungsten wore, providing an excellent cost performance
  10. An easy method for setting cutting conditions
    To find the optimum cutting conditions for SP wire, first set the cutting conditions for a brass wire electrode having a diameter equal to SP wire. Then gradually increase the wire tension until the SP wire breaks. The optimum tension is that just before breakage.
    You may also be able to obtain SP wire cutting condition data from ED machine manufacturers.