INDUSTRY COMPONENT

Tensioning Bolt

A precision bolt used to apply and maintain controlled tension in core clamping systems for secure machine operation.

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Component Specifications

Definition
A tensioning bolt is a specialized threaded fastener designed to generate and sustain precise axial tension in clamping assemblies, particularly in core clamping systems of industrial machinery. It functions by converting torque into controlled tensile force through its thread geometry and material properties, ensuring uniform pressure distribution and preventing component slippage or misalignment during high-load operations.
Working Principle
The tensioning bolt operates on the principle of torque-to-tension conversion. When tightened, rotational torque applied to the bolt head creates axial tension along the bolt shaft. This tension generates clamping force between connected components, with the bolt's elastic elongation storing mechanical energy to maintain consistent pressure. Proper preload calculation ensures the bolt remains within its elastic range to prevent permanent deformation or failure.
Materials
Typically manufactured from high-strength alloy steels (e.g., ASTM A574, ISO 898-1 Grade 10.9 or 12.9), stainless steels (AISI 304/316), or specialty alloys for corrosive environments. Surface treatments include zinc plating, hot-dip galvanizing, or phosphate coating for corrosion resistance.
Technical Parameters
  • Proof Load 830-1100 MPa
  • Thread Type Metric coarse/fine or UNF
  • Length Range 20mm to 300mm
  • Diameter Range M6 to M36
  • Tensile Strength 900-1200 MPa
  • Temperature Range -40°C to +150°C
  • Torque Coefficient 0.18-0.22
Standards
ISO 4014, ISO 4017, DIN 931, DIN 933, ASME B18.2.1

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Tensioning Bolt.

tensioning bolt core clamping bolt industrial fasteners machine clamping components torque-to-tension bolts high-strength bolts precision fastening Tensioning Bolt in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Core Clamping System

A mechanical assembly that securely clamps and holds the magnetic core in place within a medium voltage current transformer.

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Fastening System

A mechanical assembly designed to securely attach and hold screen panels in place within industrial equipment.

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Engineering Analysis

Risks & Mitigation
  • Over-torquing causing bolt fracture
  • Under-torquing leading to clamping failure
  • Corrosion in harsh environments
  • Fatigue failure from cyclic loading
  • Thread stripping due to improper installation
FMEA Triads
Trigger: Excessive torque during installation
Failure: Bolt fracture or thread stripping
Mitigation: Use calibrated torque wrenches with proper lubrication; follow manufacturer torque specifications
Trigger: Vibration and cyclic loading
Failure: Fatigue cracking and eventual fracture
Mitigation: Implement lock washers or thread-locking compounds; regular inspection for cracks
Trigger: Corrosive operating environment
Failure: Reduced cross-sectional area and strength loss
Mitigation: Select corrosion-resistant materials; apply protective coatings; regular cleaning and inspection

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
ISO 4759-1 tolerance class 6g for threads; length tolerance ±1mm for standard sizes
Test Method
Tensile testing per ISO 898-1; torque-tension testing per ISO 16047; salt spray testing per ISO 9227 for corrosion resistance

Buyer Feedback

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Frequently Asked Questions

How is tensioning bolt preload calculated?

Preload is calculated using the formula F = T/(K×d), where F is preload force, T is applied torque, K is torque coefficient (0.18-0.22 for lubricated threads), and d is nominal bolt diameter. Proper lubrication and surface conditions must be considered for accurate results.

What maintenance is required for tensioning bolts?

Regular inspection for corrosion, thread damage, or elongation; periodic torque verification using calibrated torque wrenches; and replacement if deformation exceeds 0.2% of original length. Lubrication of threads during installation is critical.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Tensioning Arm or Slide Tensioning Screw