{"title":"US No. 321 Mandrel – Busch Stainless Steel Mandrel, Made in Germany","description":"\u003cp\u003eThe \u003cstrong\u003eUS No. 321\u003c\/strong\u003e is the American number for a mandrel with a 5 mm head (ISO size 050): a stainless steel carrier that mounts abrasive and polishing discs in the handpiece. Busch \u0026amp; Co. manufactures it in Germany as \u003cstrong\u003eBusch No. 305RS 050\u003c\/strong\u003e. Every US No. 321 on this page is a genuine Busch instrument and ships from our US warehouse.\u003c\/p\u003e\u003ch2\u003eWhich US No. 321 Do You Need?\u003c\/h2\u003e\u003cdiv style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;\"\u003e\u003ctable style=\"border-collapse:collapse;font-size:14px;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"border:1px solid #ddd;padding:6px 10px;text-align:left;background:#f6f6f6;\"\u003eUS No.\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:6px 10px;text-align:left;background:#f6f6f6;\"\u003eBusch No.\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:6px 10px;text-align:left;background:#f6f6f6;\"\u003eMaterial\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:6px 10px;text-align:left;background:#f6f6f6;\"\u003eCut\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:6px 10px;text-align:left;background:#f6f6f6;\"\u003eShank\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:6px 10px;text-align:left;background:#f6f6f6;\"\u003eBest for\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:6px 10px;text-align:left;background:#f6f6f6;\"\u003ePack\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e\u003ca href=\"\/products\/hp-mandrel-stainless-disc-mandrel-dental-305rs-050-pack-of-6\"\u003e321\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e305RS 050\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eStainless Steel\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e—\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eHP\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eStraight handpiece: laboratory and denture work\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003cp style=\"font-size:13px;\"\u003eHP (2.35 mm shank, straight handpiece). See the \u003ca href=\"\/pages\/busch-bur-size-chart\"\u003eBusch Bur Size Chart\u003c\/a\u003e for head and shank dimensions.\u003c\/p\u003e\u003ch2\u003eClinical Uses of the US No. 321\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinishing and polishing:\u003c\/strong\u003e carrying abrasive discs for contouring and polishing composite, acrylic and metal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeparation:\u003c\/strong\u003e carrying separating discs in the laboratory.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAt 5 mm the No. 321 is a head sized for standard dental discs.\u003c\/p\u003e\u003ch2\u003eSpeed and Technique\u003c\/h2\u003e\u003cp\u003eFit only discs designed for the mandrel head, seat them fully, and run at the disc manufacturer’s speed; replace a mandrel whose head no longer holds a disc securely. Maximum recommended speeds for every Busch shape are in our \u003ca href=\"\/pages\/dental-bur-speed-chart\"\u003eDental Bur Speed Chart\u003c\/a\u003e, and reprocessing steps in the \u003ca href=\"\/pages\/dental-bur-sterilization-guide\"\u003eBur Sterilization Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eMade in Germany by Busch \u0026amp; Co.\u003c\/h2\u003e\u003cp\u003eBusch \u0026amp; Co. has manufactured rotary instruments in Engelskirchen, Germany since 1905. Every instrument on this page is a genuine Busch product, precision-ground on a concentric shank under ISO-certified quality management and guaranteed to arrive free of manufacturing defects under our \u003ca href=\"\/pages\/warranty\"\u003eBusch arrival guarantee\u003c\/a\u003e.\u003c\/p\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0943\/1318\/5566\/files\/MadeInGermanySmall.png?v=1775134964\" alt=\"Dental Instruments, Tools, Burs, Diamonds and Polishers Made In Germany\"\u003e\u003c\/div\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Busch number for the US 321 mandrel?\u003c\/strong\u003e Busch No. 305RS 050 in HP.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eRelated resources:\u003c\/strong\u003e \u003ca href=\"\/pages\/us-bur-numbers\"\u003eUS Bur Number Finder\u003c\/a\u003e · \u003ca href=\"\/pages\/bur-comparison-chart\"\u003eBur Comparison Chart\u003c\/a\u003e · \u003ca href=\"\/pages\/dental-bur-speed-chart\"\u003eSpeed Chart\u003c\/a\u003e · \u003ca href=\"\/pages\/dental-bur-glossary\"\u003eBur Glossary\u003c\/a\u003e\u003c\/p\u003e","products":[{"product_id":"hp-mandrel-stainless-disc-mandrel-dental-305rs-050-pack-of-6","title":"US No. 321 Busch Stainless Steel Mandrel | Busch No. 305RS 050 – HP | Pack of 6","description":"\u003cp\u003eThe \u003cstrong\u003eHP mandrel stainless disc mandrel dental\u003c\/strong\u003e instrument from Busch is a precision-engineered tool designed to meet the demands of modern dental practice. Manufactured in Germany, this disc mandrel provides reliable performance for mounting and driving polishing or abrasive discs in straight handpiece (HP) applications.\u003c\/p\u003e\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThis pack contains 6 units of the 305RS 050 (US No. 321) HP mandrel, offering excellent value for busy dental practices and laboratories. The stainless construction ensures corrosion resistance, longevity, and consistent handling across repeated sterilization cycles.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eStandard Classification:\u003c\/strong\u003e ISO: 330 104 604 391 050\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eStainless steel construction for enhanced durability and hygiene\u003c\/li\u003e\n\u003cli\u003eCompatible with straight handpiece (HP) systems\u003c\/li\u003e\n\u003cli\u003eDesigned for secure disc retention during rotary procedures\u003c\/li\u003e\n\u003cli\u003ePack of 6 for cost-effective clinical use\u003c\/li\u003e\n\u003cli\u003eManufactured to ISO classification standards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cp\u003eAs a reliable \u003cstrong\u003eHP mandrel stainless disc mandrel dental\u003c\/strong\u003e solution, this instrument is suited for use with abrasive and polishing discs in restorative and finishing procedures. The mandrel design supports stable, centered disc rotation, contributing to controlled, accurate preparation and finishing work.\u003c\/p\u003e\u003ch2\u003eGerman Engineering\u003c\/h2\u003e\u003cp\u003eBusch \u0026amp; Co. GmbH has a longstanding reputation for producing high-quality dental rotary instruments. Every \u003cstrong\u003eHP mandrel stainless disc mandrel dental\u003c\/strong\u003e unit reflects their commitment to precision manufacturing and consistent clinical standards. Made in Germany.\u003c\/p\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0943\/1318\/5566\/files\/MadeInGermanySmall.png?v=1775134964\" alt=\"Dental Instruments, Tools, Burs, Diamonds and Polishers Made In Germany\"\u003e\u003c\/div\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat handpiece is this mandrel compatible with?\u003c\/strong\u003e This mandrel is designed for use with straight handpiece (HP) systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many units are included?\u003c\/strong\u003e Each pack contains 6 mandrels.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the mandrel autoclavable?\u003c\/strong\u003e The stainless steel construction is suitable for standard dental sterilization processes, though specific sterilization guidelines should be followed per your practice protocol.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the ISO classification?\u003c\/strong\u003e The ISO classification for this instrument is 330 104 604 391 050.\u003c\/p\u003e","brand":"Busch \u0026 Co. GmbH","offers":[{"title":"Default Title","offer_id":50367832293662,"sku":"014897","price":22.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0943\/1318\/5566\/files\/305rs-base_39f15c94-b0a4-4c40-b585-fbd611d9ae91.png?v=1766500834"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0943\/1318\/5566\/collections\/305rs-base_39f15c94-b0a4-4c40-b585-fbd611d9ae91.png?v=1789481600","url":"https:\/\/deutschedt.com\/collections\/us-321-mandrel.oembed","provider":"Deutsche Dental Technologien","version":"1.0","type":"link"}