{"product_id":"spark-exhaust-stainless-tube-28mm-500mm","title":"Spark Exhaust Stainless Steel Tube Ø 28 × 1.5 mm 500 mm Universal G9010","description":"\u003cp\u003eHalf a metre of straight AISI 304 at twenty-eight millimetres, and the only small-bore size in Spark's range with a wall a full millimetre and a half thick.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eStraight exhaust tube, AISI 304 stainless steel.\u003c\/li\u003e\n\u003cli\u003eØ 28 mm outside, 1.5 mm wall thickness.\u003c\/li\u003e\n\u003cli\u003e500 mm long.\u003c\/li\u003e\n\u003cli\u003eThe smallest diameter Spark stocks.\u003c\/li\u003e\n\u003cli\u003eFabrication stock — cut, welded and fitted by the builder.\u003c\/li\u003e\n\u003cli\u003eSpark part number G9010, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhy the Wall Is Thicker Here\u003c\/h2\u003e\u003cp\u003eEvery tube Spark stocks between thirty-two and sixty millimetres has a one millimetre wall. This one, and the seventy-six at the other end of the range, have thicker ones.\u003c\/p\u003e\u003cp\u003eThe reason is stiffness. A tube resists bending in proportion to its diameter cubed, so a small tube is dramatically floppier than a large one at the same wall. At twenty-eight millimetres, one millimetre of stainless would kink under a bender and dent under a boot; a millimetre and a half does not.\u003c\/p\u003e\u003ch2\u003eWhat It Is For\u003c\/h2\u003e\u003cp\u003eSmall-bore work. Balance pipes between headers, link sections on a 125 or a small single, breather and drain runs, and the short connecting pieces that a one-off system needs and no catalogue sells.\u003c\/p\u003e\u003cp\u003eAt this diameter it is rarely the main gas path on anything above 250 cc. It is the plumbing around the plumbing.\u003c\/p\u003e\u003ch2\u003eCutting and Welding Stainless\u003c\/h2\u003e\u003cp\u003eCut it with an abrasive wheel or a cold saw, not with a chop saw meant for mild steel — carbon contamination on the cut face is the most common cause of a stainless weld that rusts a year later.\u003c\/p\u003e\u003cp\u003eTIG with a stainless filler and back-purge the inside. Without purge gas the root of the weld oxidises, goes granular and cracks under heat cycling. That is not a cosmetic issue on an exhaust.\u003c\/p\u003e\u003ch2\u003eAISI 304\u003c\/h2\u003e\u003cp\u003eThe standard austenitic stainless: roughly eighteen per cent chromium, eight per cent nickel. It is the material almost every quality exhaust is built from, because it takes exhaust temperature without scaling and takes road salt without pitting.\u003c\/p\u003e\u003cp\u003eIt does work-harden as it is formed, which matters if you plan to bend it: bend once, deliberately, rather than adjusting a bend repeatedly.\u003c\/p\u003e\u003ch2\u003eNot Plumbing Tube\u003c\/h2\u003e\u003cp\u003eDecorative and sanitary stainless of the same nominal size is not the same product. Ornamental tube is made to a looser wall tolerance and is often welded from strip with an internal bead that has never been removed — a ridge running down the bore. On an exhaust that ridge is a flow obstruction and a crack starter. Exhaust tube is made without it.\u003c\/p\u003e\u003ch2\u003eHalf a Metre\u003c\/h2\u003e\u003cp\u003eSpark supplies this article as a 500 mm length. If a project needs more, order the number of pieces you need — there is no half-length or cut-to-size version, and joining two lengths is one more weld than a longer piece would have needed.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53617858707722,"sku":"G9010","price":22.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/5c0fcb22c4a53_f29fa3f7-b6ba-442b-91b6-7d7ff77fbe91.png?v=1788362674","url":"https:\/\/inter-pace.com\/products\/spark-exhaust-stainless-tube-28mm-500mm","provider":"Inter-Pace","version":"1.0","type":"link"}