Hex Socket Set Screws DIN913‑DIN916 Headless Grub Screws For Shaft Locking Mechanical Transmission Assembly
Set screws, also widely called grub screws, are headless full‑thread fasteners manufactured to DIN, ANSI, JIS and ISO standards. Without external protruding heads, set screws sit fully inside tapped holes after tightening. Locking force comes from direct contact between the screw tip and shaft surface, preventing relative rotation and sliding between gears, pulleys, shaft sleeves and other rotating parts. This flush‑mount design saves valuable installation space and eliminates scratch hazards for compact mechanical assemblies. We supply metric sizes M1‑M12 and imperial sizes from 0#‑1/2 inch, covering micro‑size precision parts up to heavy‑duty industrial specifications.
Main Tip Types & Functional Features
Different end‑point designs deliver completely different locking performance for set screws. Cone point set screws feature sharp conical tips for high torsional resistance. They create local deformation on hard shaft surfaces and work well for precision angular positioning before final fixation. Flat point set screws distribute compressive force evenly. They will not leave indent marks on aluminum, plastic and other soft substrates, ideal for assemblies requiring repeated disassembly and adjustment. Cup point set screws form micro indentations on mating surfaces to build anti‑rotation interference fit. They are the most popular choice for equipment working under continuous dynamic vibration and load conditions. Dog point set screws extend a locating pin tip which fits into pre‑machined shaft grooves or holes. They deliver accurate radial positioning and can partly replace dowel pins for alignment tasks. Nylon point set screws adopt elastomeric soft tips. They achieve mar‑free fastening, protecting finished shaft surfaces while maintaining stable holding power.
Available Material, Drive Type & Surface Treatment
We produce set screws in multiple material grades including SUS304, SUS316 stainless steel, 8.8,10.9,12.9 heat‑treated carbon steel and brass. Stainless steel variants offer outstanding corrosion resistance for humid, coastal salt‑spray and outdoor working environments. High‑grade carbon steel provides superior clamping strength for heavy‑duty machinery. Brass set screws bring good corrosion resistance and electrical conductivity for electrical and plumbing precision equipment. Available drive options contain hex socket, slotted, torx and pozidriv drives to match different assembly tool requirements. Surface treatment choices include black oxide, zinc plating, nickel plating and passivation to upgrade wear‑resistance and rust protection.
Quality Control & Production Standard
Our factory operates under ISO9001, ISO14001 and TS16949 quality management systems. Every batch starts with incoming raw‑material inspection for chemical composition and mechanical hardness. Thread rolling and CNC turning processes strictly control thread tolerance. Finished goods go through sampling inspection covering dimension check, hardness test and torque verification before packing. Standard‑range set screws meet RoHS compliance for export mechanical and electronic projects. Both small‑batch trial orders and mass bulk production are accepted, MOQ for custom items is 10000pcs.
Typical Application Fields
Set screws are widely adopted across diverse industrial sectors. Mechanical transmission systems: positioning and locking gears, pulleys, shaft sleeves and shaft couplings. Automotive industry: axial fixation for steering wheel assemblies and gearbox internal components. Electronic & optical instruments: post‑adjustment positioning for optical lenses and sensor assemblies. Medical equipment: temporary locking for adjustable brackets and precision instrument frames. Power tools, valve assemblies and door hardware also frequently implement headless grub screws for flush‑surface fastening requirements.
Company Introduction
We are a professional Chinese fastener manufacturer specializing in standard and non‑standard industrial fasteners. Our complete production workshop covers CNC turning, thread rolling, stamping and surface‑treatment procedures. We have long‑term cooperation experience with global buyers from machinery, automation, new‑energy, automotive, medical and electronics industries. Our engineering team supports full‑cycle custom development from drawing review, sample making to mass‑production delivery.
Get In Touch For Technical Support & Quotation
If you are sourcing reliable set screws for your mechanical project, please share your drawings, dimension parameters, tip requirements and working‑condition details. Our technical team will help you select proper tip style, material grade and surface finish, and deliver competitive factory‑direct quotation.
FAQ
Q: Why do set screws get loose easily?
A: Loosening usually results from continuous vibration, material creep or insufficient installation torque. You can apply thread locker or adopt anti‑loosening structural tips to improve long‑term locking performance.
Q: How do I select suitable tip type for set screws?
A: Cone point fits high‑hardness steel or titanium alloy shafts. Flat point is recommended for soft aluminum and plastic parts. Cup point works for general balancing and vibration‑exposed assemblies. Dog point is selected when precise pre‑groove positioning is required.
Q: Do I need to control tightening torque during installation?
A: Yes. Excessive torque will cause thread stripping or substrate deformation. Using a torque wrench following technical specifications is strongly suggested.
Q: Can set screws be reused?
A: Reuse is allowed only when threads and tip surfaces remain undamaged. You must re‑verify locking performance before putting them back into service.
Q: What is the difference between set screws and ordinary headed screws?
A: Set screws have no outer head and rely on tip compression force to lock components. Ordinary screws realize fastening by clamping force generated between screw head and threads.
