{"title":"DIN 916 K Serrated-Locking Cup-Tip Set Screw | Alloy Steel 45H Grade 12.9 Black","description":"\u003ch2\u003eFULLERKREG DIN 916 K Serrated-Locking Cup-Tip Set Screw — Alloy Steel ML40Cr | Grade 45H (12.9) | Black Oxide\u003c\/h2\u003e\n\n\u003cp\u003eFULLERKREG DIN 916 K serrated-locking cup-tip set screws are engineered for high-vibration and high-load applications where conventional set screws are prone to loosening. The knurled (serrated) locking ring beneath the hex socket head bites into the mating surface under torque, providing a mechanical anti-loosening effect without adhesives or secondary locking elements.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e DIN 916 K (cup-tip set screw with serrated locking collar)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrive:\u003c\/strong\u003e Internal hex (Allen \/ hex socket), per ISO 4026 \/ DIN 916 geometry\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Style:\u003c\/strong\u003e Cup tip — provides a secure, non-marring grip on shafts and flat surfaces\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLocking Mechanism:\u003c\/strong\u003e Serrated (knurled) collar — mechanically locks against the mating surface to resist vibration-induced loosening\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy Steel ML40Cr (chromium-molybdenum alloy steel, equivalent to 40Cr per GB\/T 3077)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStrength Grade:\u003c\/strong\u003e 45H — equivalent to ISO 898-1 Grade 12.9 for set screws\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface Treatment:\u003c\/strong\u003e Black oxide (blackening) — corrosion inhibition, low reflectivity, dimensional neutrality\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e Metric coarse thread (ISO 68-1), right-hand\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eMaterial \u0026amp; Mechanical Properties\u003c\/h3\u003e\n\u003cp\u003eManufactured from \u003cstrong\u003eML40Cr alloy steel\u003c\/strong\u003e — a chromium-alloyed medium-carbon steel offering excellent hardenability, toughness, and fatigue resistance. Fully compliant with the mechanical requirements of \u003cstrong\u003eISO 898-1\u003c\/strong\u003e and \u003cstrong\u003eDIN 267-11\u003c\/strong\u003e for property class 45H \/ 12.9 set screws.\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eValue\u003c\/th\u003e\n      \u003cth\u003eStandard Reference\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProperty Class\u003c\/td\u003e\n      \u003ctd\u003e45H (≡ 12.9)\u003c\/td\u003e\n      \u003ctd\u003eISO 898-1 \/ DIN 267-11\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMinimum Hardness\u003c\/td\u003e\n      \u003ctd\u003e45 HRC\u003c\/td\u003e\n      \u003ctd\u003eISO 898-1 Table 10\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMaximum Hardness\u003c\/td\u003e\n      \u003ctd\u003e52 HRC\u003c\/td\u003e\n      \u003ctd\u003eISO 898-1 Table 10\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eVickers Hardness (min)\u003c\/td\u003e\n      \u003ctd\u003e450 HV\u003c\/td\u003e\n      \u003ctd\u003eISO 898-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMinimum Torsional Strength\u003c\/td\u003e\n      \u003ctd\u003ePer ISO 898-1 Table 10 by size\u003c\/td\u003e\n      \u003ctd\u003eISO 898-1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCore Hardness\u003c\/td\u003e\n      \u003ctd\u003e390–460 HV\u003c\/td\u003e\n      \u003ctd\u003eDIN 267-11\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMaterial\u003c\/td\u003e\n      \u003ctd\u003eML40Cr Alloy Steel\u003c\/td\u003e\n      \u003ctd\u003eGB\/T 3077 \/ ISO equivalent\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eSurface Treatment: Black Oxide\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eChemical blackening (black oxide) per applicable finishing standards\u003c\/li\u003e\n  \u003cli\u003eProvides mild corrosion resistance — recommended for indoor or protected environments\u003c\/li\u003e\n  \u003cli\u003eAdds no measurable dimensional change (unlike zinc plating)\u003c\/li\u003e\n  \u003cli\u003eLow reflectivity — suitable for optical, precision, and aesthetic assemblies\u003c\/li\u003e\n  \u003cli\u003eTypically applied with a light oil post-treatment for enhanced protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eDimensional Reference (DIN 916 \/ ISO 4029 Cup-Tip)\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSize\u003c\/th\u003e\n      \u003cth\u003eThread Pitch (mm)\u003c\/th\u003e\n      \u003cth\u003eHex Key Size (mm)\u003c\/th\u003e\n      \u003cth\u003eCup Tip Dia. dk (mm)\u003c\/th\u003e\n      \u003cth\u003eCommon Lengths (mm)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e3, 4, 5, 6, 8, 10, 12\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e4, 5, 6, 8, 10, 12, 16\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e5, 6, 8, 10, 12, 16, 20\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e6, 8, 10, 12, 16, 20, 25\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e1.25\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e8, 10, 12, 16, 20, 25, 30\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e10, 12, 16, 20, 25, 30, 40\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e1.75\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e12, 16, 20, 25, 30, 40, 50\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e16, 20, 25, 30, 40, 50\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e20, 25, 30, 40, 50\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eAll dimensions per DIN 916 \/ ISO 4029. Consult FULLERKREG product listings for exact available size\/length combinations.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eLocking Performance: How the Serrated Collar Works\u003c\/h3\u003e\n\u003cp\u003eThe DIN 916 K variant adds a \u003cstrong\u003eknurled (serrated) locking ring\u003c\/strong\u003e integrated at the base of the hex socket head. When the set screw is tightened:\u003c\/p\u003e\n\u003col\u003e\n  \u003cli\u003eThe cup tip engages the shaft or mating surface, transmitting axial clamping force.\u003c\/li\u003e\n  \u003cli\u003eThe serrated collar simultaneously bites into the bore wall or housing surface.\u003c\/li\u003e\n  \u003cli\u003eThe resulting mechanical interlock resists rotational loosening under dynamic loads, vibration, and thermal cycling — without thread-locking adhesives.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThis makes DIN 916 K set screws ideal for \u003cstrong\u003eshaft collars, shaft couplings, gear hubs, pulleys, and precision positioning assemblies\u003c\/strong\u003e subject to vibration or shock.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eShaft-to-hub locking in motors, gearboxes, and drive systems\u003c\/li\u003e\n  \u003cli\u003eShaft collars and couplings in industrial machinery\u003c\/li\u003e\n  \u003cli\u003ePrecision positioning in CNC fixtures and tooling\u003c\/li\u003e\n  \u003cli\u003eVibration-prone assemblies in automotive, robotics, and automation equipment\u003c\/li\u003e\n  \u003cli\u003eOptical and instrumentation mounts requiring secure, non-marring fastening\u003c\/li\u003e\n  \u003cli\u003eReplacement for standard DIN 916 where vibration loosening is a concern\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eCompliance \u0026amp; Standards\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIN 916\u003c\/strong\u003e — Hexagon socket set screws with cup point\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIN 916 K\u003c\/strong\u003e — DIN 916 with serrated (knurled) locking collar\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 4029\u003c\/strong\u003e — Hexagon socket set screws with cup point (international equivalent)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 898-1\u003c\/strong\u003e — Mechanical properties of fasteners made of carbon steel and alloy steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIN 267-11\u003c\/strong\u003e — Fasteners: Technical specifications — Property classes for set screws\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 68-1\u003c\/strong\u003e — Metric screw threads: General plan\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003ePackaging \u0026amp; Supply\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAvailable in bulk bags, boxes, and custom packaging for OEM and MRO supply\u003c\/li\u003e\n  \u003cli\u003eWholesale and B2B pricing available — contact FULLERKREG for volume quotations\u003c\/li\u003e\n  \u003cli\u003eFull material certifications (mill certs, hardness test reports) available on request\u003c\/li\u003e\n  \u003cli\u003eRoHS compliant; REACH-compliant surface treatment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhy Choose FULLERKREG?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eManufactured to DIN\/ISO dimensional and mechanical standards — not just nominal equivalents\u003c\/li\u003e\n  \u003cli\u003eFull traceability: heat number, material cert, and hardness test documentation available\u003c\/li\u003e\n  \u003cli\u003eConsistent 45H \/ 12.9 hardness verified by Rockwell testing per ISO 898-1\u003c\/li\u003e\n  \u003cli\u003eBlack oxide finish applied in-process with oil post-treatment for shelf-stable inventory\u003c\/li\u003e\n  \u003cli\u003eCompetitive lead times for standard sizes; custom lengths and thread forms on request\u003c\/li\u003e\n\u003c\/ul\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/din-916-k-serrated-locking-cup-tip-set-screw-alloy-steel-45h.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}