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Internal External Threaded CNC Screws Connector Precision Stainless Steel Bolts

Categories CNC Screws
Brand Name: SITUO
Model Number: ST-30008
Certification: ISO9001 & TS16949
Place of Origin: GuangDong Dongguan
MOQ: 1PCS
Price: 5-10 USD per item
Payment Terms: T/T
Supply Ability: 10000PCS per day
Delivery Time: Communication
Packaging Details: Communication
Material: stainless steel
Category: hexagonal nuts
Surface treatment: Passivation
Processing technology: CNC turning
Sample period: 10 to 15 days
Precision: Min0.001
head shape: Hexagon
Application: nut
Size: M12
Corrosion Resistance: High
Specification: Customized
product name: screw
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Internal External Threaded CNC Screws Connector Precision Stainless Steel Bolts

Stainless steel internal and external threaded connector with precision CNC screws


Medical Device Industry

Application Scenarios

Mainly used in Class III medical devices, including connecting screws for surgical instruments (such as laparoscopes and orthopedic surgical instruments), fasteners for orthopedic implants (e.g., artificial joints, fracture fixation plates) and dental implants (e.g., dental implant abutments), as well as fixing screws for precision components in medical equipment enclosures (e.g., MRI machines, hematology analyzers), endoscopes, etc.
These fasteners are in direct contact with the human body or used in core medical equipment, requiring extremely high biocompatibility, precision, and cleanliness.

Core Production Characteristics

  • Biocompatible Material Selection Priority is given to materials with excellent biocompatibility, such as medical-grade titanium alloy (e.g., Ti-6Al-4V) and 316L stainless steel. These materials are non-toxic, non-sensitizing, well-tolerated by human tissue, and have outstanding corrosion resistance (withstanding human body fluids and disinfectants).
    Strict purity testing of raw materials is required during production to eliminate harmful impurities. Surface polishing, passivation, and other processes are applied to further enhance biocompatibility.
  • Micron-level Precision and Surface Quality Control Dimensional tolerances reach the micron level; some micro screws have tolerances controlled at ±0.001~±0.003 mm. Surface finish must meet Ra ≤ 0.8 μm, free of burrs and scratches to avoid damaging human tissue or harboring bacteria.
    High-precision micro-machining equipment and ultra-precision measuring instruments (e.g., laser measuring devices) are used. Processing techniques are optimized to reduce surface defects and ensure compliance with precision and surface quality standards.
  • Miniaturization and Structural Optimization Extensive use of micro screws below M1, as well as headless, semi-countersunk, hexagon socket, and other designs to fit narrow installation spaces in medical devices. Anti-loosening structures (e.g., anti-slip threads, locking grooves) are designed to prevent loosening during surgery or equipment operation.
    Implantable fasteners feature an edge-free design for easy insertion and removal, with optimized thread geometry to improve fixation stability.
  • Compliance and Cleanliness Control Strictly follow the ISO 13485 medical device quality management system. Production environments must meet cleanroom standards (e.g., Class 10,000, Class 100,000) to avoid product contamination.
    Production processes include deburring, ultrasonic cleaning, and sterile packaging to ensure products are impurity-free and sterilizable (withstanding autoclaving, UV sterilization, etc.). A complete quality inspection system is established, with each batch undergoing biocompatibility testing, precision testing, and sterility testing.

General Core Characteristics of CNC Machined Screws

  • Ultra-high precision: Standard tolerance ±0.01 mm, precision versions up to ±0.001 mm, with precise, gap-free thread matching.
  • High consistency: Program-controlled, ensuring uniform dimensions, geometric form, and surface quality in mass production.
  • Flexible customization: No mold required, enabling fast switching for non-standard pitches, special heads, multi-step profiles, and unique slot types.
  • Wide material compatibility: Capable of machining stainless steel, titanium alloy, aluminum alloy, copper alloy, high-temperature alloy, etc.
  • Flexible efficiency & batch size: Suitable for small-batch prototyping and medium-batch customization, with fast switching between single parts and multi-variety production.

CNC Machined Screws vs. Traditional Screws (Thread Rolling / Cold Heading)

Comparison ItemCNC Machined ScrewsTraditional Thread Rolling / Cold Heading Screws
PrecisionUltra-high (±0.001~±0.01 mm)General (±0.05~±0.1 mm)
CustomizationExtremely strong (non-standard / special / complex structures)Weak (mainly standard parts)
Batch SizeSmall / Medium batch / Single pieceLarge batch (starting from 10,000 pieces)
MaterialsFully compatible (including difficult-to-machine materials)Mainly low-carbon steel, aluminum alloy
CostHigh unit costLow cost in large volumes
ApplicationHigh-end, precision, customized scenariosGeneral standard parts, large-volume production

We have introduced advanced equipment and technology from Japan and Germany (CNC 5-axis and 6-axis machines) to better serve our customers' needs.


Our maximum processing outer diameter is 60, and the minimum control tolerance is 0.001. We have Japanese CNC Tsugami, CNC Citizen, multi-station cold extrusion forming machines, 500T press machines, casting equipment, and various process equipment, which can effectively provide customers with the best technical solutions.


Our company has a total of 300 employees, including 20 technicians, 10 engineers, and 15 quality control personnel. We have over 300 pieces of equipment.


Our company implements 8S management and has passed ISO9001 and TS16949 automotive certifications.


Our customers include , bo-sch, Foxconn, Motors, Husqvarna, Shimano, NVIDIA, DJI Drones, Siegenia, and Cater-pillar.


OUR CAPACITY
Main product names:Stainless steel screws, carbon steel screws, pins, rivets, nuts,
eccentric nails, embedded parts, and other fasteners.
Business TypeFactory / Maufacture
ServiceCNC Machining
Turning and Milling
CNC Turning
Cold heading
stamping
Assembly Service
Material1). Aluminum: AL 6061-T6, 6063, 7075-T etc
2). Stainless steel:303,304,304L,316L,316F,630,410,420,430, etc
3). Steel: 4140, Q235, Q345B,20#,45# 1215,12L14 ,1144,1006,1008,1010,1015,1018 ,10B21,1035,1065 etc.
4)Alloy steel:5140,4135,4140,3435,5120,415 ,435,440 etc
5). Titanium: TA1,TA2/GR2, TA4/GR5, TC4, TC18 etc
6). Brass: C36000 (HPb62), C37700 (HPb59), C26800 (H68), C22000(H90),C27000,C51900,C11000,C3604,H62,H65 etc
7). Copper, bronze, Magnesium alloy, Delrin, POM,Acrylic, PC, etc.
FinishSandblasting, Anodize color, Blackenning, Zinc/Nickl Plating, Polish,
Power coating, Passivation PVD, Titanium Plating, Electrogalvanizing,
electroplating chromium, electrophoresis, QPQ(Quench-Polish-Quench),
Electro Polishing,Chrome Plating, Knurl, Laser etch Logo, etc.
Drawing formatSTEP,STP,GIS,CAD,PDF,DWG,DXF etc or samples.
Tolerance+/-0.01mm ~ +/-0.05mm
Surface roughnessRa 0.1~3.2
InspectionComplete inspection lab with Micrometer, Optical Comparator, Caliper Vernier,CMM
Depth Caliper Vernier, Universal Protractor, Clock Gauge, Internal Centigrade Gauge

China Internal External Threaded CNC Screws Connector Precision Stainless Steel Bolts factory
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