{"product_id":"high-precision-carbon-bearing-steel-balls-solid-bearings-ball-diameter-1-12-5mm","title":"High-Precision Carbon\/Bearing Steel Balls Solid Bearings Ball Diameter 1-12.5mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003ePrecision Steel Balls 1–12.5mm — Consistent Roundness for Demanding Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a worn bearing seat, a sticking valve, or a custom linear rail demands a replacement ball that fits exactly right, guessing on grade or diameter costs time and money. Machinists, maintenance technicians, and serious DIY builders who need dimensionally accurate rolling elements in small-to-medium quantities will find this listing covers the widest practical size range in one place — 1 mm through 12.5 mm, including fractional inch equivalents such as 1\/16\" (1.588 mm), 3\/8\" (9.525 mm), and 3\/4\" (19.05 mm).\u003c\/p\u003e\n\u003cp\u003eEach precision steel ball is manufactured from either Carbon Steel or Bearing Steel (GCr15 \/ 52100 equivalent). Carbon Steel balls offer solid hardness and economy for general-purpose use, while Bearing Steel balls deliver tighter roundness tolerances, higher surface hardness, and superior fatigue resistance for load-bearing and high-cycle applications. Diameters span 1 mm to 12.5 mm (approximately 0.039\" to 0.492\"), with both metric and fractional inch sizes available as separate variant options.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include replacing rolling elements in miniature ball bearings and linear guides, acting as check-ball seats in hydraulic and pneumatic valves, serving as pivot points in precision instruments and jigs, and functioning as grinding media or decorative hardware in custom fabrication projects. Bulk pack options (10, 30, 50, 100, or 300 pieces) let you stock exactly what a repair run or production batch requires.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility Note:\u003c\/strong\u003e These balls are ungrooved solid spheres. Verify the bore diameter and ball grade of your bearing or valve seat before ordering. If your application requires a specific G-grade (e.g., G10, G25, G100), please contact us to confirm availability.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Precision Steel Balls\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔵\u003c\/span\u003e\u003cstrong\u003eWide Diameter Range:\u003c\/strong\u003e 50+ size options from 1 mm to 12.5 mm, including fractional inch equivalents (1\/16\", 3\/32\", 1\/8\", 5\/32\", 3\/16\", 7\/32\", 1\/4\", 9\/32\", 5\/16\", 3\/8\", and more), reducing the need to source from multiple suppliers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eTwo Material Grades:\u003c\/strong\u003e Carbon Steel for cost-effective general use; Bearing Steel (GCr15 \/ 52100 equivalent) for applications requiring tighter roundness, higher surface hardness (typically HRC 60–66), and extended fatigue life under cyclic load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eConsistent Sphericity:\u003c\/strong\u003e Manufactured to controlled roundness tolerances suitable for standard bearing replacement and valve seat applications; surface finish is smooth and free of visible seams or flat spots.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities:\u003c\/strong\u003e Available in 10, 30, 50, 100, or 300-piece packs — order the exact quantity needed for a single repair, a maintenance kit, or a production run without paying for excess stock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eCorrosion Resistance:\u003c\/strong\u003e Carbon Steel balls have inherent oil-retention properties when lightly lubricated; Bearing Steel balls resist oxidation better under grease-packed or sealed conditions. For wet or corrosive environments, consider stainless steel alternatives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eBroad Application Fit:\u003c\/strong\u003e Suitable for miniature ball bearings, linear motion guides, check valves, hydraulic systems, precision instruments, jigs and fixtures, and custom mechanical assemblies requiring a dimensionally accurate rolling element.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Precision Steel Balls\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eSolid Precision Steel Ball\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial Options\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel \/ Bearing Steel (GCr15 \/ 52100 equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e1 mm – 12.5 mm (approx. 0.039\" – 0.492\"); fractional inch sizes included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSmooth ground; free of visible seams or flat spots\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness (Bearing Steel)\u003c\/th\u003e\n\u003ctd\u003eTypically HRC 60–66 (contact us to confirm for specific diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness (Carbon Steel)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRoundness Tolerance\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Quantities\u003c\/th\u003e\n\u003ctd\u003e10 \/ 30 \/ 50 \/ 100 \/ 300 PCS per order\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eBall bearings, linear guides, check valves, hydraulic seats, precision instruments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eModerate (suitable for lubricated\/sealed environments; not for prolonged wet exposure)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right diameter for my bearing replacement?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the existing ball with a micrometer or caliper, or check the bearing's datasheet for the ball diameter specification. The diameter is typically listed in the bearing's internal geometry table. If you are replacing balls in a standard deep-groove ball bearing (e.g., 608, 6200 series), the ball diameter is fixed by the bearing standard — match it exactly. For fractional inch applications, look for the equivalent metric size listed in our variant options (e.g., 1\/16\" = 1.588 mm, 3\/8\" = 9.525 mm).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between Carbon Steel and Bearing Steel balls?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon Steel balls are made from medium-to-high carbon steel and offer good hardness and economy, making them suitable for general-purpose applications such as casters, drawer slides, and low-load pivots. Bearing Steel balls (GCr15 \/ AISI 52100 equivalent) are manufactured to tighter tolerances, achieve higher surface hardness (typically HRC 60–66), and have superior fatigue resistance under cyclic loading — making them the correct choice for precision ball bearings, linear guides, and hydraulic check valves where long service life matters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls corrosion-resistant? Can I use them in wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBoth Carbon Steel and Bearing Steel balls have moderate corrosion resistance. They perform well in grease-packed, oil-lubricated, or sealed environments. However, they are not recommended for prolonged exposure to water, salt spray, or aggressive chemicals without protective lubrication. For wet or corrosive environments, stainless steel balls (e.g., AISI 316 or 440C) would be a more appropriate choice. Contact us if you need stainless alternatives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat grade (G-grade) are these balls, and does it matter for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBall grade (G10, G25, G100, etc.) defines the roundness, surface roughness, and diameter variation tolerance per ISO 3290. Lower G-numbers indicate tighter tolerances. For standard bearing replacement and valve seat applications, G25–G100 is typically sufficient. For ultra-precision spindles or optical instruments, G10 or better may be required. If your application specifies a particular G-grade, please contact us to confirm availability before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls in hydraulic or pneumatic check valves?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Solid steel balls are a common check-ball material in hydraulic and pneumatic valve bodies. Select the diameter that matches your valve seat bore — the ball must seat cleanly against the valve seat to form a reliable seal. Bearing Steel balls are generally preferred for valve applications due to their higher hardness and better surface finish, which improves sealing contact. Verify the pressure rating and fluid compatibility of your system before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow should I decide between ordering 10, 30, 50, 100, or 300 pieces?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor a single bearing repair or prototype build, a 10-piece pack provides enough balls with a few spares. A 30- or 50-piece pack suits a small maintenance kit or a short production run. The 100- and 300-piece packs offer a lower per-unit cost and are practical for recurring maintenance schedules, assembly lines, or resale. Check the per-piece price across pack sizes on the variant selector — larger packs typically reduce the cost per ball significantly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your diameter, material, and quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"1mm \/ Carbon Steel \/ 10PCS","offer_id":52409834766610,"sku":"GLFBTXJ2024GANGZHU3701x10","price":5.88,"currency_code":"USD","in_stock":true},{"title":"1mm \/ Carbon Steel \/ 30PCS","offer_id":52409834799378,"sku":"GLFBTXJ2024GANGZHU3701x30","price":6.01,"currency_code":"USD","in_stock":true},{"title":"1mm \/ Carbon Steel \/ 50PCS","offer_id":52409834832146,"sku":"GLFBTXJ2024GANGZHU3701x50","price":6.16,"currency_code":"USD","in_stock":true},{"title":"1mm \/ Bearing Steel \/ 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