{"product_id":"ohlins-piston-holder-8-40-m12x1-25-03172-04","title":"Öhlins Piston holder 8\/40\/M12x1.25 – 03172-04","description":"\u003cp\u003ePiston holder 8\/40\/M12x1.25, Öhlins part number 03172-04. Replacing a piston is a workshop job because the shim stack has to be rebuilt in the correct order.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDimension A 8 mm\u003c\/li\u003e\n\u003cli\u003eÖhlins part number 03172-04\u003c\/li\u003e\n\u003cli\u003eOriginal Öhlins service part\u003c\/li\u003e\n\u003cli\u003eDimension B 40 mm\u003c\/li\u003e\n\u003cli\u003eThread M12x1.25\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFunction\u003c\/h2\u003e\u003cp\u003e03172-04 is the 8 mm, 40 mm version — Öhlins lists each size separately. A check valve holds pressure in one direction and opens in the other; a worn one lets damping bleed away. Valves and needles set the adjustable part of the damping; the piston sets the rest. A scored piston face means oil bypasses the shims entirely.\u003c\/p\u003e\u003ch2\u003eGenuine Service Part\u003c\/h2\u003e\u003cp\u003eÖhlins supports its suspension with individual service parts, which is why a fifteen-year-old damper can still be rebuilt to specification. Every part in this catalogue is one Öhlins fits itself during assembly and service. For a full rebuild, the seal kit plus the wear parts is usually the sensible order. The Öhlins exploded view names the number for each position; we can look it up if you do not have it.\u003c\/p\u003e\u003ch2\u003eHow to Be Sure It Fits\u003c\/h2\u003e\u003cp\u003eÖhlins identifies this position by the number 03172-04 in the exploded view for the unit it belongs to. dimension a 8 mm, dimension b 40 mm is what distinguishes this number from its neighbours in the range. A check valve holds pressure in one direction and opens in the other; a worn one lets damping bleed away. The seat face has to be flat enough for the first shim to seal against it.\u003c\/p\u003e\u003ch2\u003eFitting and Setup Service\u003c\/h2\u003e\u003cp\u003eWe are an authorised Öhlins service centre, so you do not have to source the tools and the nitrogen: send us the damper and we rebuild it with the correct parts and the correct setting.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003eBrand:\u003c\/em\u003e Öhlins\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003ePart Number:\u003c\/em\u003e 03172-04\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eCategory:\u003c\/em\u003e Piston Holders\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eDimension A:\u003c\/em\u003e 8 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eDimension B:\u003c\/em\u003e 40 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eThread:\u003c\/em\u003e M12x1.25\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eCountry of Origin:\u003c\/em\u003e Sweden\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Öhlins","offers":[{"title":"Default Title","offer_id":53649295114506,"sku":"03172-04","price":72.55,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/03172-04_97a0653c-5223-4513-af29-a8ca126a6bcf.png?v=1788874686","url":"https:\/\/inter-pace.com\/en-gi\/products\/ohlins-piston-holder-8-40-m12x1-25-03172-04","provider":"Inter-Pace","version":"1.0","type":"link"}