{"id":5151,"date":"2025-07-20T01:12:53","date_gmt":"2025-07-20T08:12:53","guid":{"rendered":"https:\/\/guxiangjs.com\/?post_type=product&p=5151"},"modified":"2025-07-20T01:12:53","modified_gmt":"2025-07-20T08:12:53","slug":"utool-twist-drill-bit-hss-high-speed-steel-twist-drill-in-sizes-0-5-mm-0-8-mm-5-2-mm-and-5-9-13-mm-for-precision-mold-drilling","status":"publish","type":"product","link":"https:\/\/guxiangjs.com\/zh\/shop\/utool-twist-drill-bit-hss-high-speed-steel-twist-drill-in-sizes-0-5-mm-0-8-mm-5-2-mm-and-5-9-13-mm-for-precision-mold-drilling\/","title":{"rendered":"UTOOL Twist Drill Bit-HSS (High-Speed Steel) twist drill in sizes 0.5 mm, 0.8 mm, 5.2 mm, and 5.9\u201313 mm for precision mold drilling"},"content":{"rendered":"
    \n
  1. Performance
    \n\u2022 Premium HSS Substrate \u2013 Manufactured from cobalt-enriched imported high-speed steel (\u2248 6 % Co, 64 \u00b1 1 HRC) that keeps edge hardness above 58 HRC at 600 \u00b0C, resisting thermal softening in prolonged dry drilling cycles.
    \n\u2022 Steam-Oxide Surface \u2013 Microporous black-oxide conversion layer holds cutting fluid, lowers friction, and evacuates chips cleanly from deep mold cavities; no flaking or dimensional change.
    \n\u2022 Precision Geometry \u2013 118 \u00b0 split-point tip with \u00b10.5 \u00b0 grind accuracy delivers true self-centering starts and reduces thrust by up to 30 % versus conventional chisel-point drills. Helix angle 30 \u00b1 1 \u00b0 and margin width 0.25 D maintain straight, burr-free walls even in tool steel.
    \n\u2022 Tight Diameter Control \u2013 Ground to h8 tolerance (-0 \/ -12 \u00b5m for \u00d8\u22643 mm; -0 \/ -18 \u00b5m for \u00d8 > 3 mm), supporting press-fit dowel or coolant-channel holes without secondary reaming.<\/li>\n
  2. Application Scenarios & Assembly Requirements
    \n\u2022 Mold & Die Work \u2013 \u00d80.5\u20130.8 mm sizes pierce vent holes in injection molds; mid-range \u00d85.2 mm opens ejector-pin seats; \u00d85.9\u201313 mm covers coolant circuits and core-pin locations in P20, H13, or SKD61 steels up to 35 HRC.
    \n\u2022 Precision Fabrication \u2013 Ideal for drilling stainless fastener holes, hardened bushings, and fixture plates where positional accuracy and surface finish are critical.
    \n\u2022 Machining Guidelines
    \n\u2013 Spindle Run-Out: \u2264 0.01 mm TIR; use ER collet or hydraulic chuck.
    \n\u2013 Cutting Data (P20 steel, emulsion coolant):
    \n\u00d8\u22641 mm\u2003vc = 18 m min\u207b\u00b9, f = 0.008 mm rev\u207b\u00b9
    \n\u00d85 mm\u2003vc = 24 m min\u207b\u00b9, f = 0.10 mm rev\u207b\u00b9
    \n\u00d810 mm vc = 28 m min\u207b\u00b9, f = 0.18 mm rev\u207b\u00b9
    \n\u2013 Peck cycle every 3 \u00d7 \u00d8 for holes deeper than 6 \u00d7 \u00d8.
    \n\u2013 Coolant: flood or through-spindle oil-mist for diameters \u22655 mm; air blast acceptable for micro sizes.<\/li>\n
  3. User-Friendly Operation
    \n\u2022 Self-Starting Split Point \u2013 Eliminates center-punching and reduces walking on curved or polished mold surfaces, saving setup time.
    \n\u2022 Unified Shank System \u2013 Straight shank equals drill diameter up to 13 mm, compatible with standard DIN 338 holders; no sleeves or special adapters needed.
    \n\u2022 Laser-Etched Identification \u2013 Diameter, lot number, and material code permanently marked on shank for quick retrieval and traceability after repeated use.
    \n\u2022 Protective Packaging \u2013 Each bit seated in individual, indexed tubes with anti-rust VCI liner; micro sizes supplied in foam-lined cases to prevent chipping.<\/li>\n
  4. Quality & Longevity
    \n\u2022 ISO 9001 \/ ISO 14001 Certified Production \u2013 In-process CNC vision inspection controls tip symmetry, helix angle, and land width within \u00b10.01 mm.
    \n\u2022 Extended Tool Life \u2013 Comparative endurance tests in 1.2312 steel show up to 2.5 \u00d7 more holes per re-grind than conventional HSS drills, owing to cobalt enrichment and controlled oxide layer.
    \n\u2022 Re-Sharpenable \u2013 Full-length flute grinding and generous web thickness allow multiple regrinds without compromising rigidity; original geometry specification sheet included for accurate restoration.
    \n\u2022 Environmental Compliance \u2013 RoHS \/ REACH approved materials; steam-oxide finish requires no hazardous chrome coatings, ensuring safe disposal and recycling at end of life.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"

    Performance \u2022 Premium HSS Substrate \u2013 Manufactured from cobalt-enriched imported high-speed steel (\u2248 6 % Co, 64 \u00b1 1 HRC) that keeps edge hardness above 58 HRC at 600 \u00b0C, resisting thermal softening in prolonged dry drilling cycles. \u2022 Steam-Oxide Surface \u2013 Microporous black-oxide conversion layer holds cutting fluid, lowers friction, and evacuates chips cleanly […]<\/p>","protected":false},"featured_media":5152,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[34],"product_tag":[],"class_list":{"0":"post-5151","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-abrasives-cutting-drilling-tools","8":"first","9":"instock","10":"taxable","11":"shipping-taxable","12":"purchasable","13":"product-type-variable"},"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/guxiangjs.com\/zh\/wp-json\/wp\/v2\/product\/5151","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/guxiangjs.com\/zh\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/guxiangjs.com\/zh\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/guxiangjs.com\/zh\/wp-json\/wp\/v2\/comments?post=5151"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/guxiangjs.com\/zh\/wp-json\/wp\/v2\/media\/5152"}],"wp:attachment":[{"href":"https:\/\/guxiangjs.com\/zh\/wp-json\/wp\/v2\/media?parent=5151"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/guxiangjs.com\/zh\/wp-json\/wp\/v2\/product_brand?post=5151"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/guxiangjs.com\/zh\/wp-json\/wp\/v2\/product_cat?post=5151"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/guxiangjs.com\/zh\/wp-json\/wp\/v2\/product_tag?post=5151"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}