{"product_id":"stainless-bros-1d-1-75in-clr-90-degree-bend-2in-leg-mandrel-bend","title":"Stainless Bros 1D \/ 1.75in CLR 90 Degree Bend 2in Leg Mandrel Bend","description":"\u003cp\u003eThe Stainless Bros 1D \/ 1.75in CLR 90 Degree Bend 2in Leg Mandrel Bend (part number 601-04556-4100) is a compact tight-radius 90-degree tube section for 1.75-inch custom exhaust, turbo, and intercooler piping builds where space is at a premium. Precision-bent from 16-gauge 304 stainless steel, this component keeps the bore fully round through the 90-degree sweep to maintain flow in tight-clearance installations. The 1D radius at 1.75in CLR and the short 2-inch leg deliver the tightest possible 90-degree turn in this diameter, making it a go-to choice for chassis routing, turbocharger outlet plumbing, and compact exhaust sections on smaller displacement builds.\u003c\/p\u003e\n\n\u003ch4\u003eFeatures and Benefits\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e16-gauge (0.065in wall) 304 stainless steel resists exhaust heat and corrosion for long service life\u003c\/li\u003e\n\u003cli\u003eMandrel-bent 1D tight radius at 1.75in CLR delivers the smallest footprint 90-degree bend possible in 1.75in tubing\u003c\/li\u003e\n\u003cli\u003e2in leg provides usable trim material while minimizing the overall installed length\u003c\/li\u003e\n\u003cli\u003eFully round bore prevents turbulence and maintains flow velocity through the bend\u003c\/li\u003e\n\u003cli\u003ePolished OD surface is TIG and MIG weld-ready after acetone cleaning\u003c\/li\u003e\n\u003cli\u003eCompact geometry suits tight turbo plumbing, inter-pipe routing, and downpipe fabrication on small-displacement engines\u003c\/li\u003e\n\u003cli\u003eCompatible with standard 1.75in exhaust clamps, slip-joints, and flanges\u003c\/li\u003e\n\u003cli\u003ePart of the Stainless Bros SS304 mandrel bend family for consistent fit and finish across a full build\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e601-04556-4100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eStainless Bros\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWall Thickness\u003c\/td\u003e\n\u003ctd\u003e16 gauge \/ 0.065in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube OD\u003c\/td\u003e\n\u003ctd\u003e1.75in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBend Radius\u003c\/td\u003e\n\u003ctd\u003e1D \/ 1.75in CLR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBend Angle\u003c\/td\u003e\n\u003ctd\u003e90 Degree\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLeg Length\u003c\/td\u003e\n\u003ctd\u003e2in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003ePolished OD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eStainless Bros limited warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Stainless Bros 1.75in 90-degree 1D tight-radius mandrel bend (part 601-04556-4100)\u003c\/li\u003e\n\u003cli\u003e2in straight leg\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the tube OD for the 601-04556-4100?\u003c\/strong\u003e\u003cbr\u003e\nThe outside diameter is 1.75 inches. Use 1.75in exhaust clamps, slip joints, or flanges when connecting this bend to adjacent pipe sections.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the CLR for this 1D mandrel bend at 1.75in?\u003c\/strong\u003e\u003cbr\u003e\nThe centerline radius (CLR) is 1.75 inches, equal to 1x the tube diameter. This is the tightest radius achievable by mandrel bending at this tube size, ideal for space-constrained routing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhere is this bend typically used?\u003c\/strong\u003e\u003cbr\u003e\nThe 601-04556-4100 is commonly used in small-displacement turbo downpipes, exhaust mid-pipes, intercooler inlet and outlet plumbing, and tight-clearance header collector merge sections on four-cylinder and rotary engine builds.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow short is the leg on this bend?\u003c\/strong\u003e\u003cbr\u003e\nThe leg is 2 inches. For very tight installations, 2 inches provides just enough material to trim and weld. If you need more straight material, plan to add an extension tube section before or after the bend.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat weld filler rod is recommended for the 601-04556-4100?\u003c\/strong\u003e\u003cbr\u003e\nER308L for stainless-to-stainless joints and ER309L for stainless-to-mild-steel joints. TIG welding with argon back-purge is the preferred method for a clean, full-penetration weld.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the 1D tight radius going to cause excessive backpressure on a 1.75in exhaust?\u003c\/strong\u003e\u003cbr\u003e\nIn 1.75in diameter piping, a 1D bend typically causes a modest increase in restriction compared to a 1.5D bend. For most applications at this diameter, the difference is acceptable, especially when the alternative is a crush-bent pipe or a larger footprint that cannot fit the available space.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I use this bend in a 1.75in OD mild steel exhaust system?\u003c\/strong\u003e\u003cbr\u003e\nYes. Weld it in using ER309L filler rod for the dissimilar metal joint. The stainless section will outlast mild steel sections and is a practical upgrade for frequently replaced bend sections.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat are the overall dimensions of this bend including the arc and leg?\u003c\/strong\u003e\u003cbr\u003e\nThe 2-inch leg plus the 1.75in CLR arc results in a compact total footprint. For precise routing mockups, use the CLR and leg length to calculate the space needed before purchase.\u003c\/p\u003e\n\n\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eConfirm the available space in the routing path using a cardboard or wire mockup of the bend geometry before cutting existing tubing.\u003c\/li\u003e\n\u003cli\u003eDry-fit the 601-04556-4100 to verify leg length is sufficient. Add extension straight sections if needed before welding.\u003c\/li\u003e\n\u003cli\u003eMark and trim leg to required length with a tubing cutter or cutoff wheel.\u003c\/li\u003e\n\u003cli\u003eDeburr the cut end thoroughly to remove sharp edges.\u003c\/li\u003e\n\u003cli\u003eClean weld areas with acetone before TIG or MIG welding.\u003c\/li\u003e\n\u003cli\u003eTack in position, verify alignment, then complete circumferential welds.\u003c\/li\u003e\n\u003cli\u003eInspect welds for full penetration and absence of leaks before final installation.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Stainless Bros","offers":[{"title":"Default Title","offer_id":40482990424143,"sku":"STB601-04556-4100","price":17.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/stainless-bros-1d-1_75in-clr-90-degree-bend-2in-leg-mandrel-bend-steel-tubing-stainless-bros.jpg?v=1719930170","url":"https:\/\/www.blackopsautoworks.com\/products\/stainless-bros-1d-1-75in-clr-90-degree-bend-2in-leg-mandrel-bend","provider":"Black Ops Auto Works","version":"1.0","type":"link"}