Stainless tying wire UK: black, galvanised, or specified

Three coils on the counter all say tying wire. One is black. One is galvanised. One is marked 1.2 mm. The shed base will disappear under the pour. The balcony edge is the face people will look at. Stainless tying wire UK fits that edge when someone has named stainless, or the work is the exposed highway class. It is the wrong coil for the buried sheet.

Finish comes before diameter. Black annealed wire is the handmade tie inside a pour. Galvanised is for a tie that can stain a seen face. Stainless is for a specification that names it. A cheap black coil on a featured edge, and stainless for every outdoor job, are the two misses.

This page is from the Products Compared editorial team. It follows the Concrete Society, Next Day Steel, and Stainless UK's 1.2 mm grade 304 coil. Millimetres are on 16 gauge tying wire. We did not pour a slab or cut a coil in a lab. The nipper price is the amazon.co.uk listing saved on 16 October 2026. A qualifying purchase can earn a commission at no extra cost to you.

In short

Black annealed tying wire is the ordinary coil for steel that will be buried. Galvanised tying wire is the Next Day Steel step when a tie may sit near an exposed face, because black wire can stain. Stainless, in the UK trade note we used, is 1.2 mm grade 304 where that finish is specified, including exposed faces of bridges, roads, and similar structures. A 1.2 mm strand is not 16 gauge. Outdoor, on its own, does not mean stainless.

Black annealed is the ordinary coil

Black annealed tying wire is soft wire with a dark finish, sold for lacing bars and mesh. The Concrete Society describes 16 gauge annealed wire as the economical handmade tie. That is the coil for steel inside the concrete when the drawing has not named another metal. CMT sells black annealed 16 gauge and 17 gauge for that ordinary fixing, and Cocus sells the same split. If the packet only says tying wire, ask which finish is in the coil.

Read the millimetres, then the colour. Here, 16 gauge is about 1.6 mm, and CMT's 16 gauge coil is 1.65 mm. 17 gauge is about 1.4 mm. Both are black annealed wire. The thicker size suits heavier cages. The thinner size is the mesh coil. If the drawing names a diameter, that name wins.

Black is allowed on a buried footing. The limit is the face. Black wire against a shutter can leave a rust mark, which the Concrete Society treats as cosmetic rather than a structural failure on its own. Buying the black reel for a featured edge, because it is cheaper, is the miss. Turn the cut ends into the cage. That bend is on how to tie rebar with nippers.

Galvanised when the face can stain

Galvanised tying wire is steel with a zinc coating. Next Day Steel keeps black annealed wire for general work and points to galvanised wire where a tie may sit near an exposed face, because black wire can stain. Change the coil for ties that can touch concrete people will see: a fair-faced wall, a power-floated slab left bare, the arris of a balcony. A path base under paving, and a trench footing under soil, stay on the black coil.

Rain on the cage is not the same problem as a wire in the cover of a seen face. The zinc slows a rust mark from that wire. It does not promise a clean face. A galvanised tail pointed at the shutter is still a projecting end. Turn the ends inward either way.

Galvanised is not stainless. If the drawing prints stainless, a galvanised coil does not satisfy the word. If the drawing prints nothing and the face will be seen, galvanised is the step Next Day Steel describes. Ask the person who owns the drawing.

Stainless when the specification says so

Stainless tying wire is a specification. Stainless UK sells 1.2 mm grade 304 coils and states that the Specification for Highway Works requires 1.2 mm stainless tying wire on exposed faces of bridges, roads, and similar structures. That is their account of the specification, not a clause copied here. A domestic shed slab is not that class of work. Buying stainless because the job is outside spends the money on the wrong element.

The diameter travels with the metal. 1.2 mm stainless is not the 16 gauge coil above. Using it on buried mesh is the other miss. If the drawing prints 1.2 mm or stainless, use that coil. If it prints 16 gauge annealed, the stainless reel is the wrong purchase.

Stainless makes the tie itself less likely to rust and stain. It does not stop every mark. A stainless tail left in the form can still spoil the cover, and ordinary steel in the shutter can still streak the paste. Grade 304 is what Stainless UK prints for this product. If the packet names neither the grade nor the millimetres, put it back.

What the coil asks of the nipper

The finish changes what the jaws bite. Soft annealed wire is meant to twist and stay. Stainless tying wire is harder than that black coil, even at 1.2 mm. Thinner is not softer. Do not treat a medium-hard capacity as a stainless test.

Knipex states 3.8 mm medium-hard wire for the 99 11 300 pattern. Annealed wire at 1.4 mm or 1.6 mm sits inside that line. The figure is the manufacturer's claim, not a stainless test. We did not cut a 1.2 mm grade 304 coil. If the edges skate, stop. A pipe on the handle is not a method.

The other two rows in the binding pliers comparison get no stainless capacity here. The Pissente listing states no diameter. The Zeromall hook does not say it cuts. Do not pin 3.8 mm on either of them. The KNIPEX 99 11 300 is 300 mm and £26.99 on amazon.co.uk, with 4.5 from 1,073 reviews. In a tight cage, trade notes still centre about 200 mm to 250 mm. Length is on the concreters nippers buying guide. A hook that never cuts is on concreters' nippers versus a wire twister. Protect your eyes: the Health and Safety Executive treats flying particles as an eye hazard, and a wire end is that kind of piece.

A blank note on a balcony edge

A balcony edge with no wire named is the awkward case. The steel note is often a bar size and nothing else. The edge is a face you will see, so the cheap black coil is the wrong economy. Galvanised wire is what Next Day Steel describes near an exposed face. Stainless is what you use when the specification says stainless, or when the work is in the exposed highway class Stainless UK describes. A blank line does not turn the balcony into a bridge, and it does not permit the black reel because the mesh downstairs used it.

Ask which finish and which millimetre for the ties that can meet this face. Keep black wire for buried steel, and keep the named coil for the edge. Mixing them in one pouch is how the wrong strand lands on the arris. If you cannot get an answer, do not invent one and pour. Hand that edge to whoever owns the drawing.

How we prepared this guide

The Products Compared editorial team used the Concrete Society notes on tying wire and on rust staining, Next Day Steel on black and galvanised wire, and Stainless UK on 1.2 mm grade 304 and the highway statement. We did not reproduce the Specification for Highway Works. The 3.8 mm line is Knipex's claim. The £26.99 price and 1,073 reviews are from the amazon.co.uk listing on 16 October 2026. There was no laboratory cut.

Sources: Concrete Society, tying wire, Concrete Society, rust staining, Next Day Steel, Stainless UK, CMT, and HSE PPE.

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