{"product_id":"1kg-high-precision-steel-balls-bearing-ball-diameter-6-9mm-8-1mm","title":"1kg High-Precision Steels Balls Solid Metal Bearings Ball Diameter 6.9mm-8.1mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1kg High-Precision Steel Balls — Tight-Tolerance Bearing Balls for Demanding Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a loose or oversized ball causes premature bearing failure, vibration, or measurement error, the root cause is almost always dimensional inconsistency. Engineers, machinists, and DIY builders who work with precision assemblies need steel balls they can trust to spec — every single time. These 1kg high-precision steel balls are stocked in a continuous diameter range from 6.90 mm (0.272 in) to 8.10 mm (0.319 in), giving you the exact size your application demands without compromise.\u003c\/p\u003e\n\u003cp\u003eEach bag contains approximately 1 kg of solid steel balls in a single selected diameter. The balls are manufactured from carbon steel or chrome steel (depending on diameter variant) with a smooth, ground surface finish. Diameters span 6.90 mm through 8.10 mm in increments as fine as 0.01 mm, with select sizes including the industry-standard 7.938 mm (5\/16 in) fractional dimension.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include replacement rolling elements in radial ball bearings, precision gauge calibration and go\/no-go fixtures, ball-screw and linear-motion assemblies, valve seats in fluid-control systems, and load-distribution inserts in jigs and fixtures. The consistent sphericity and surface finish make these balls equally suited to industrial maintenance and precision hobby builds.\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:\u003c\/strong\u003e Suitable for open and shielded radial ball bearings, linear guides, valve assemblies, and precision measurement fixtures requiring balls in the 6.90 mm – 8.10 mm diameter range. Verify your bore or race diameter before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These High-Precision Steel Bearing Balls\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eFine-increment diameter selection\u003c\/strong\u003e — available in steps as small as 0.01 mm across the 6.90–8.10 mm range, including the 7.938 mm (5\/16 in) fractional standard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e \u003cstrong\u003e1 kg per order\u003c\/strong\u003e — sold by weight so you receive a consistent quantity of balls in your chosen diameter; ideal for stocking maintenance kits or batch replacements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eSolid steel construction\u003c\/strong\u003e — through-hardened carbon or chrome steel core delivers the load capacity and wear resistance required in rolling-contact applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✨\u003c\/span\u003e \u003cstrong\u003eGround and polished surface\u003c\/strong\u003e — smooth spherical finish reduces friction, minimises race wear, and supports accurate seating in valve and gauge applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eCorrosion-resistant finish\u003c\/strong\u003e — surface treatment provides baseline protection against oxidation during storage and light-duty wet environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eDirect drop-in replacement\u003c\/strong\u003e — dimensional consistency allows these balls to replace worn rolling elements in standard radial bearings without re-machining the race.\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 Bearing Balls\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e6.90 mm – 8.10 mm (0.272 in – 0.319 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Increment\u003c\/th\u003e\n\u003ctd\u003eAs fine as 0.01 mm; see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 kg (weight-based; ball count varies by diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel \/ Chrome steel (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eGround and polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSphericity \/ Tolerance Grade\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Protection\u003c\/th\u003e\n\u003ctd\u003eSurface-treated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eBall bearings, valve seats, gauges, linear guides, jigs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight per Package\u003c\/th\u003e\n\u003ctd\u003e1 kg\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 correct ball diameter for my bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the inner race diameter of your bearing with a micrometer or digital caliper. The replacement ball should match the original ball diameter, not the bore or outer diameter of the bearing. If you have the bearing part number, cross-reference the manufacturer's datasheet for the specified ball diameter. For worn races, select the next size up (e.g., step from 7.00 mm to 7.01 mm) to restore the correct preload.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls strong enough for load-bearing applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The balls are manufactured from through-hardened carbon or chrome steel, which provides the compressive strength and fatigue resistance required for rolling-contact loads in standard radial ball bearings. For heavy-load or high-speed spindle applications, confirm the grade (G10–G100) with us before ordering to ensure the tolerance class meets your dynamic load requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these balls rust if used in a damp environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe balls carry a surface treatment that provides baseline corrosion protection during storage and intermittent exposure to moisture. For continuous wet or submerged environments, we recommend applying a compatible bearing grease or considering stainless steel balls instead. Contact us to confirm availability of stainless variants in your required diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with both open and shielded bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The ground and polished surface finish is compatible with open bearings, single-shielded (Z), and double-shielded (ZZ) configurations. The balls seat correctly in standard Conrad-type and angular-contact races. Ensure the diameter you select matches the original specification — even a 0.01 mm oversize ball can increase preload significantly in a tight race.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many balls are included in 1 kg?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe ball count depends on the selected diameter. As a reference, a solid steel ball at 7.00 mm weighs approximately 1.41 g, yielding roughly 709 balls per kilogram. At 8.00 mm, each ball weighs approximately 2.10 g, yielding roughly 476 balls per kilogram. Exact counts vary slightly with material density. If you need a specific count rather than a weight-based quantity, contact us before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls for precision gauge calibration or measurement fixtures?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese balls are suitable for go\/no-go gauges, ball-end probes, and dimensional fixtures where a consistent spherical reference is needed. For certified metrology applications requiring traceable dimensional documentation (e.g., ISO 3290 grade certification), contact us to confirm whether a calibration certificate is available for your chosen diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 7.938 mm and 8.00 mm options?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe 7.938 mm size is the metric equivalent of the 5\/16 inch fractional dimension (5 ÷ 16 × 25.4 = 7.9375 mm), commonly specified in inch-standard bearings used in North American and legacy British equipment. The 8.00 mm option is the ISO metric standard size. If your bearing datasheet specifies 5\/16 in, select 7.938 mm. If it specifies 8 mm, select 8.00 mm — the 0.062 mm difference is significant in precision races.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your diameter above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"6.90mm \/ 1kg","offer_id":52409842532626,"sku":"GLFBTXJ2024GANGZHU4274x1","price":126.55,"currency_code":"USD","in_stock":true},{"title":"6.95mm \/ 1kg","offer_id":52409842565394,"sku":"GLFBTXJ2024GANGZHU4275x1","price":126.55,"currency_code":"USD","in_stock":true},{"title":"6.98mm \/ 1kg","offer_id":52409842598162,"sku":"GLFBTXJ2024GANGZHU4276x1","price":126.55,"currency_code":"USD","in_stock":true},{"title":"7.00mm \/ 1kg","offer_id":52409842630930,"sku":"GLFBTXJ2024GANGZHU4277x1","price":126.55,"currency_code":"USD","in_stock":true},{"title":"7.01mm \/ 1kg","offer_id":52409842663698,"sku":"GLFBTXJ2024GANGZHU4278x1","price":126.55,"currency_code":"USD","in_stock":true},{"title":"7.02mm \/ 1kg","offer_id":52409842696466,"sku":"GLFBTXJ2024GANGZHU4279x1","price":126.55,"currency_code":"USD","in_stock":true},{"title":"7.03mm \/ 1kg","offer_id":52409842729234,"sku":"GLFBTXJ2024GANGZHU4280x1","price":126.55,"currency_code":"USD","in_stock":true},{"title":"7.04mm \/ 1kg","offer_id":52409842762002,"sku":"GLFBTXJ2024GANGZHU4281x1","price":127.27,"currency_code":"USD","in_stock":true},{"title":"7.84mm \/ 1kg","offer_id":52409842794770,"sku":"GLFBTXJ2024GANGZHU4282x1","price":127.27,"currency_code":"USD","in_stock":true},{"title":"7.90mm \/ 1kg","offer_id":52409842827538,"sku":"GLFBTXJ2024GANGZHU4283x1","price":125.84,"currency_code":"USD","in_stock":true},{"title":"7.92mm \/ 1kg","offer_id":52409842860306,"sku":"GLFBTXJ2024GANGZHU4284x1","price":125.84,"currency_code":"USD","in_stock":true},{"title":"7.938mm \/ 1kg","offer_id":52409842893074,"sku":"GLFBTXJ2024GANGZHU4285x1","price":125.84,"currency_code":"USD","in_stock":true},{"title":"7.95mm \/ 1kg","offer_id":52409842925842,"sku":"GLFBTXJ2024GANGZHU4286x1","price":125.84,"currency_code":"USD","in_stock":true},{"title":"7.96mm \/ 1kg","offer_id":52409842958610,"sku":"GLFBTXJ2024GANGZHU4287x1","price":125.84,"currency_code":"USD","in_stock":true},{"title":"7.97mm \/ 1kg","offer_id":52409842991378,"sku":"GLFBTXJ2024GANGZHU4288x1","price":125.84,"currency_code":"USD","in_stock":true},{"title":"7.98mm \/ 1kg","offer_id":52409843024146,"sku":"GLFBTXJ2024GANGZHU4289x1","price":125.84,"currency_code":"USD","in_stock":true},{"title":"7.99mm \/ 1kg","offer_id":52409843056914,"sku":"GLFBTXJ2024GANGZHU4290x1","price":125.84,"currency_code":"USD","in_stock":true},{"title":"8.00mm \/ 1kg","offer_id":52409843089682,"sku":"GLFBTXJ2024GANGZHU4291x1","price":125.84,"currency_code":"USD","in_stock":true},{"title":"8.01mm \/ 1kg","offer_id":52409843122450,"sku":"GLFBTXJ2024GANGZHU4292x1","price":125.84,"currency_code":"USD","in_stock":true},{"title":"8.02mm \/ 1kg","offer_id":52409843155218,"sku":"GLFBTXJ2024GANGZHU4293x1","price":125.84,"currency_code":"USD","in_stock":true},{"title":"8.03mm \/ 1kg","offer_id":52409843187986,"sku":"GLFBTXJ2024GANGZHU4294x1","price":125.84,"currency_code":"USD","in_stock":true},{"title":"8.04mm \/ 1kg","offer_id":52409843220754,"sku":"GLFBTXJ2024GANGZHU4295x1","price":126.55,"currency_code":"USD","in_stock":true},{"title":"8.05mm \/ 1kg","offer_id":52409843253522,"sku":"GLFBTXJ2024GANGZHU4296x1","price":127.27,"currency_code":"USD","in_stock":true},{"title":"8.10mm \/ 1kg","offer_id":52409843286290,"sku":"GLFBTXJ2024GANGZHU4297x1","price":128.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-11_d0d06dd6-9241-4b8e-b8b6-e36abea193e0.jpg?v=1782315338","url":"https:\/\/homediyer.com\/products\/1kg-high-precision-steel-balls-bearing-ball-diameter-6-9mm-8-1mm","provider":"HomeDIYer","version":"1.0","type":"link"}