INDUSTRY COMPONENT

Bolts/Nuts

Bolts and nuts are threaded fasteners used to securely join machine components, providing clamping force through tension.

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Component Specifications

Definition
Bolts and nuts are mechanical fasteners consisting of a male-threaded bolt and a female-threaded nut that work together to create a secure, removable joint. In industrial applications, they provide clamping force through axial tension, creating friction between joined surfaces to resist shear, tensile, and vibrational forces. Proper bolt/nut selection and installation are critical for structural integrity, safety, and maintenance accessibility in machinery.
Working Principle
Bolts create axial tension when tightened, generating clamping force that holds components together through friction. Nuts provide the counter-thread that allows controlled tension application via torque. The thread geometry converts rotational torque into linear force, with the bolt acting as a tension member and the nut as the compression element.
Materials
Typically carbon steel (Grade 5, 8.8), alloy steel (Grade 8, 10.9), stainless steel (A2/A4), or specialized alloys for corrosion/heat resistance. Coatings include zinc plating, hot-dip galvanizing, or phosphate treatments.
Technical Parameters
  • Preload 65-90% of yield strength
  • Nut Type Hex, lock, flange
  • Head Type Hex, socket, flange
  • Thread Type Metric (ISO) or Imperial (UNC/UNF)
  • Strength Grade 8.8, 10.9, 12.9
  • Torque Requirements Specified by diameter/grade
Standards
ISO 898, ISO 4014, ISO 4032, DIN 931, DIN 934

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bolts/Nuts.

industrial bolts machine nuts threaded fasteners bolt specifications nut standards mechanical fastening torque requirements fastener materials Bolts/Nuts Bolts/Nuts in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Manway

A sealed access opening in a pressure vessel for inspection, maintenance, and cleaning.

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Jib Foot Connection

Structural component that connects the jib (boom) to the crane's rotating platform or pedestal.

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Engineering Analysis

Risks & Mitigation
  • Insufficient preload leading to joint failure
  • Over-torquing causing bolt fracture
  • Corrosion compromising integrity
  • Vibration-induced loosening
  • Galvanic corrosion in dissimilar metals
FMEA Triads
Trigger: Incorrect torque application
Failure: Joint separation or bolt fracture
Mitigation: Use calibrated torque wrenches, follow torque specifications, implement torque verification procedures
Trigger: Vibration in dynamic applications
Failure: Progressive loosening
Mitigation: Use lock nuts, thread locking compounds, or prevailing torque fasteners
Trigger: Corrosive environment
Failure: Strength degradation and seizure
Mitigation: Select corrosion-resistant materials, apply protective coatings, implement inspection schedules

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
ISO 4759-1 for dimensional tolerances, thread tolerances per ISO 965
Test Method
Tensile testing per ISO 898-1, torque-tension testing, salt spray testing for corrosion resistance

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between bolts and screws?

Bolts require nuts to create joints and are designed for through-holes, while screws typically thread directly into materials without separate nuts.

How do I determine proper bolt torque?

Torque depends on bolt diameter, grade, material, lubrication, and joint design. Always follow manufacturer specifications or engineering calculations.

What causes bolt loosening in machinery?

Vibration, thermal cycling, improper preload, material relaxation, or insufficient locking mechanisms can cause loosening.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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