{"product_id":"25mm-ballscrew-kit-sfu2505-rm2505-1140mm-precision-anti-backlash","title":"25mm Ballscrew Kit SFU2505 RM2505 1140mm - Precision Anti-Backlash","description":"\u003cp\u003eIn this review the 25mm Ballscrew Kit SFU2505 RM2505 is evaluated for CNC hobbyists and light industrial use; the bottom line is it delivers precise, low-friction linear motion with a 5mm pitch and robust end supports, making it a strong choice when smooth micro-feeding and reduced driving power matter. The kit arrives as a complete assembly (1140mm length ball screw, metal nut, BK\/BF20 supports and a flexible coupler) and the reviewer found the C7 precision grade and rolled GCr15 construction to provide reliable positioning without stick-slip under normal loads.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e25mm diameter:\u003c\/strong\u003e a stiff shaft diameter that increases static and dynamic rigidity for improved positioning accuracy on gantries and linear stages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5mm lead:\u003c\/strong\u003e a moderate pitch that balances travel speed and fine feed control for CNC milling and router tasks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1140mm length:\u003c\/strong\u003e long travel available out of the box to suit larger machine builds without immediate need for coupling shafts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eC7 precision, GCr15 steel:\u003c\/strong\u003e rolled-thread construction and C7 grade tolerance deliver consistent, low-noise operation and long service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete end supports and coupler:\u003c\/strong\u003e BK20\/BF20 with locknuts and circlips plus a 14mm-bore flexible coupler reduce alignment headache at installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis kit is aimed at hobbyists upgrading DIY CNC machines, small machine shops building custom linear axes, and engineers who need a ready-made anti-backlash assembly with bearings and a coupler included. It suits projects that require higher stiffness and accurate micro-feeding without investing in bespoke machining.\u003c\/p\u003e\n\u003cp\u003eThose who need ultra-high precision C5 grade, nonstandard coupler bores, or metric shaft interfaces should check compatibility before buying; the seller offers customization but builders who cannot or do not want to message for special options may look for preconfigured alternatives.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncludes nut, BK\/BF20 end supports and flexible coupler so the kit is installation-ready for many CNC setups.\u003c\/li\u003e\n\u003cli\u003eLow friction rolling motion reduces heat and driving power while eliminating stick-slip for smoother feeds.\u003c\/li\u003e\n\u003cli\u003eGood static and dynamic stiffness from the 25mm shaft helps maintain accurate positioning under load.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandard coupler bore is 14mm by default, so users with different motor shafts must request a change or re-bore the coupler.\u003c\/li\u003e\n\u003cli\u003eThe item ships in C7 grade; users needing C5 tolerance must request that specifically.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSFU2505 RM2505\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLead \/ Pitch\u003c\/td\u003e\n\u003ctd\u003e5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e1140mm (44.88 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrecision Grade\u003c\/td\u003e\n\u003ctd\u003eC7 (optional C5 on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Accessories\u003c\/td\u003e\n\u003ctd\u003eMetal ballscrew nut, BK20\/BF20 end supports, flexible coupler (14mm bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eGCr15 steel, rolled thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe SFU2505 RM2505 25mm ballscrew kit is a practical, value-minded choice for DIY CNC builders and small shops that need reliable anti-backlash performance and a near-complete installation package. With solid stiffness, low friction and included supports and coupler, it represents good value for most projects, provided buyers confirm coupler bore size or request C5 tolerance if required.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the kit include end supports and a nut?\u003c\/strong\u003e\u003cbr\u003eYes, it includes one metal ballscrew nut and BK20\/BF20 end supports with locknuts and circlips.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the default coupler bore size?\u003c\/strong\u003e\u003cbr\u003eThe flexible coupler is supplied with a 14mm bore by default; request a different bore size when ordering if needed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I get a tighter precision than C7?\u003c\/strong\u003e\u003cbr\u003eYes, the seller can provide C5 grade on request; contact them to arrange the higher precision option.\u003c\/p\u003e","brand":"Mssoomm","offers":[{"title":"Default Title","offer_id":48643379790043,"sku":"B089GLDZ14","price":304.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51438pC9pmL._SL1400_7c5b0fb1-7648-42f1-9c4b-944f122ded82.jpg?v=1778565982","url":"https:\/\/gearmusthave.com\/products\/25mm-ballscrew-kit-sfu2505-rm2505-1140mm-precision-anti-backlash","provider":"GearMustHave","version":"1.0","type":"link"}