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GB/T6171 Hexagon Nuts High Precision Mechanical Connections

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GB/T6171 Hexagon Nuts High Precision Mechanical Connections
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Features
Specifications
Shape Type: Hexagon Nuts
Material Type: Customizable
Product Specifications: 1/2-18 TPI 1/8-27 TPI
Surface Treatment: Zinc Plating / Multi-color Zinc
Strength Grade: Grade 8.8
Product Grade: Grade A
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GB/T6171 Hexagon Nuts

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Hexagon Nuts High Precision

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High Precision Mechanical Connections
Basic Infomation
Place of Origin: CHINA
Brand Name: Kesle
Model Number: GB/T6171
Payment & Shipping Terms
Delivery Time: 5-8 work days
Payment Terms: T/T,Western Union,MoneyGram,PayPal
Product Description
GB/T6171 Hexagon Nuts - High Precision Mechanical Connections
Kesle GB/T 6171 Hexagon Nuts Serve High-Precision Mechanical Connections
Basic Information
Product Name: GB6171 Type A Class 1 Hexagonal Nut
Implementation Standard: GB/T 6171-2016 (current latest version)
Specification Range: Thread size: M1.6~M16 (Class A precision is mainly applicable to thread diameters ≤16mm; larger diameters are generally Class B)
Structural and Precision Features
Structural Type: Type 1 hexagonal nut (standard hexagonal structure, no special grooves or through-hole designs). Key dimensions such as across flats width (s) and thickness (m) are strictly implemented in accordance with standards.

Precision Grade: Class A represents high precision, with a thread tolerance of 6H. Dimensional tolerances for across flats width, thickness, etc., are smaller (superior to Class B), and the surface roughness is lower (usually Ra≤3.2μm), making it suitable for precision connection scenarios.
Materials and Performance
Material Selection: Materials are matched according to performance grades:
  • Carbon steel: such as 35# steel, 45# steel (suitable for performance grades 6, 8, etc.), subjected to quenched and tempered heat treatment
  • Stainless steel: e.g., 304 (A2-70), 316 (A4-70), suitable for corrosion-resistant scenarios
  • Copper/aluminum: e.g., brass (CU2), aluminum alloy (AL4), suitable for conductive and lightweight applications
Mechanical Performance: Meets the requirements of specified performance grades (6, 8, 10, A2-70, etc.):
  • Yield load: Threads show no plastic deformation under specified loads
  • Hardness: For example, the hardness of Grade 8 is 22~32HRC; the tensile strength of A2-70 is ≥700MPa
  • Corrosion resistance: Stainless steel/copper materials pass salt spray tests (e.g., 304 stainless steel can resist red rust for ≥48 hours)
Surface Treatment
Options based on application environment:
Material Treatment Options
Carbon steel Zinc plating (color zinc, white zinc, salt spray resistance ≥72 hours), chrome plating (bright and wear-resistant), phosphating (rust-proof primer), dacromet (high corrosion resistance, suitable for outdoor use)
Stainless steel Passivation treatment (enhances corrosion resistance)
Copper/aluminum Natural color (for conductive scenarios) or nickel plating (improves wear resistance)
Application Scenarios
Due to its high Class A precision and good surface quality, it is often used in occasions requiring strict connection precision and reliability:
  • Precision machinery and equipment (e.g., machine tools, instruments and meters)
  • Automotive parts (engines, transmission connections)
  • Electronic equipment (components requiring low-tolerance connections)
  • Building steel structures (matching high-precision bolts)
Quality Control
  • Dimensional inspection: Verify across flats width, thickness, and thread precision through 2D measuring instruments and thread go/no-go gauges (6H)
  • Performance testing: Check hardness with hardness testers and verify load with tensile testing machines
  • Visual inspection: No cracks, burrs, or rust, and surface roughness meets Class A requirements
GB6171 Type A nuts ensure interchangeability and reliability through standardized production, serving as common fasteners for high-precision threaded connections in the industrial field.
High precision GB/T6171 hexagon nut - industrial application GB/T6171 hexagon nut close-up showing precision threading
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