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Solid wire · bulk

STAHLWERK ER70S-6 (SG2) Ø 0.8 mm, 2 × 5 kg

The same wire as the single spool, twice — worth it only if you will use it before it corrodes.

STAHLWERK ER70S-6 (SG2) Ø 0.8 mm, 2 × 5 kg, product photograph

STAHLWERK ER70S-6 (SG2) Ø 0.8 mm, 2 × 5 kg

The same wire as the single spool, twice — worth it only if you will use it before it corrodes.

Grade
ER70S-6 (SG2)
Diameter
0.8 mm (0.03 in)
Quantity
2 spools of 5 kg (11 lb)
Amazon reference
B0BZJSZFPP
EAN
4260746545807
  • Cheaper per kilogram than buying two single spools
  • Same grade and diameter as the single-spool version — no compromise for the discount
  • The second spool sits opened or unopened for months, and steel wire corrodes

Best for: A workshop welding weekly, where the second spool will be used within months

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Specifications

Grade
ER70S-6 (SG2)
Diameter
0.8 mm (0.03 in)
Quantity
2 spools of 5 kg (11 lb)
Amazon reference
B0BZJSZFPP
EAN
4260746545807

The arithmetic

Two spools at €43 against one at €27: roughly €21.50 per spool instead of €27, a saving near twenty per cent. Real, and only if the second spool welds rather than rusts.

One decision, not two

Buying bulk is a bet on your own workshop hours. Most people overestimate them. If you are unsure, the single spool is on this page too, and the saving forgone is €5.50.

Sources

Every figure above comes from the manufacturer’s published specification for this reference. Fields the listing does not publish are left out rather than estimated. Market availability was verified per market on the EAN.

Prices quoted in this text were read on 2026-08-13. The live price is at the top of the page.

The questions welders ask

Is bulk wire a false economy?

It depends entirely on how fast you use it. Wire does not spoil in a sealed bag; it corrodes once opened in a damp workshop, and a lightly rusted spool feeds erratically and gives porous welds. If ten kilograms will last you three years, buy five and keep it dry — the saving is smaller than the spool you will eventually throw away.

Does the second spool need special storage?

Keep it sealed until it is needed, ideally with the desiccant it shipped with, and not on a concrete floor — concrete wicks moisture. An airtight box with a fresh desiccant sachet costs a few dollars and preserves the value of the bulk purchase.

Welders this fits

More mig wire

  • STAHLWERK ER70S-6 (SG2) Ø 0.8 mm, 5 kg, product photograph

    STAHLWERK ER70S-6 (SG2) Ø 0.8 mm, 5 kg

    The default steel MIG wire: 0.8 mm (0.03 in), ER70S-6, on a 200 mm (7.87 in) spool that most machines take.

    Grade
    ER70S-6 (SG2, G3Si1)
    Diameter
    0.8 mm (0.03 in)
    Weight
    5 kg (11 lb)
    Spool
    D200 — 200 mm (7.87 in) diameter
    Amazon reference
    B07TLNMGGW
    EAN
    4260294085152
    • ER70S-6 is the general-purpose steel grade: it tolerates mill scale and rust better than ER70S-3
    • 0.8 mm (0.03 in) suits 1–5 mm (0.04 to 0.20 in) steel, which is most workshop work
    • D200 spools do not fit the smallest portable machines, which take D100 only

    Best for: General steel welding on any machine that takes a 200 mm (7.87 in) spool

    Search Amazon for this model
  • STM Schweißtechnik SG2 (G3Si1) Ø 1.0 mm, product photograph

    STM Schweißtechnik SG2 (G3Si1) Ø 1.0 mm

    One millimeter wire: more deposit per pass on thick steel, and unusable on car-body sheet.

    Grade
    SG2 / G3Si1
    Diameter
    1.0 mm (0.04 in)
    Spools
    D100, D200 and K300 sizes offered
    Amazon reference
    B083KFWQ27
    EAN
    0670036746151
    • More metal deposited per pass — fewer passes on 6 mm (0.24 in) and above
    • Available on K300 spools for machines that take them
    • Needs more current: a 160 A machine will struggle to run it properly

    Best for: Structural work in 5 mm steel and above, on a machine of 180 A or more

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  • DK-Parts SG2 Ø 0.8 mm, 5 kg D200, product photograph

    DK-Parts SG2 Ø 0.8 mm, 5 kg D200

    The cheapest branded 5 kg (11 lb) spool here, at €21 — six euros under the STAHLWERK equivalent.

    Grade
    SG2 (G3Si)
    Diameter
    0.8 mm (0.03 in)
    Weight
    5 kg (11 lb)
    Spool
    D200, 200 mm (7.87 in)
    Amazon reference
    B01AMONLYK
    EAN
    0705968739275
    • Same SG2 grade designation as the dearer spools
    • D200 fits most bench machines
    • Winding quality is what separates cheap wire from good wire, and it is not published

    Best for: Practice, tacking and non-critical work where a few dollars a spool matter

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Elsewhere in the workroom

  • STARTECHWELD A-532 copper alloy electrode holder with an insulated handle

    STARTECHWELD A-532 electrode holder, 200 A

    The only electrode holder in this hub, and it publishes the three figures that decide whether it fits your machine, your cable and your rods.

    Amazon reference
    B09BHJGGW7
    EAN
    0818988015059
    • Publishes the current rating, 200 A, the maximum electrode diameter, 5/32 in, and the maximum cable size, 2/0
    • Copper alloy jaws rather than plated steel, which is what keeps the resistance and the heat down
    • Two hundred amps is the ceiling — a 250 A machine on 1/8 in rods at full output is outside it

    Best for: Replacing a holder that has gone soft, or fitting a heavier cable than the original

    ≈ $23
    Check price on Amazon
  • E6010 stick electrodes in a five-pound box

    STARTECHWELD E6010, 3/32 in, 5 lb

    The pipe welder’s rod — fast freezing, deeply penetrating, usable vertical-down — on a listing that carries two different brand names.

    Amazon reference
    B0CYQ3M1QH
    EAN
    0818988019019
    • A fast-freeze coating, which is what makes vertical-down and overhead work possible
    • Stated for all positions including vertical-up, vertical-down, overhead, flat and horizontal
    • The brand on the listing is STARTECHWELD while the product title reads "Victory Welding Alloys 6010 Welding Rod"

    Best for: Pipe, pressure work and root passes, where the slag has to freeze before the metal runs

    ≈ $29
    Check price on Amazon
  • WISUNO E6013 stick electrodes in their one-pound pack

    WISUNO E6013, 3/32 in, 1 lb

    The cheapest rods on this shelf, and the only listing anywhere in this hub that publishes the current range for each diameter.

    Amazon reference
    B0DDJQZQ8V
    EAN
    0780745664575
    • Publishes a current table by diameter: 1/16 in at 25-40 A, 5/64 in at 40-60 A, 3/32 in at 50-80 A, 1/8 in at 100-125 A
    • E6013 rutile, which is the forgiving coating this hub recommends for occasional welding
    • One pound is perhaps twenty rods — a format for trying, not for a project

    Best for: A first pound of rods, or a small machine whose dial you are still learning

    ≈ $10
    Check price on Amazon

All mig wire