INDUSTRY COMPONENT

Stud Bolts

Threaded rods with threads on both ends used to secure flanges and holders in industrial assemblies.

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Component Specifications

Definition
Stud bolts are externally threaded fasteners with threads on both ends and an unthreaded shank in the middle, designed to be used with two nuts to create a bolted joint. In holder/flange assemblies, they provide precise alignment and secure clamping force between components, allowing for disassembly and reassembly without damaging threads in the base material.
Working Principle
Stud bolts work by creating a tensioned joint through torque application on nuts at both ends. The threaded ends engage with nuts, while the unthreaded shank spans the gap between components. When tightened, the nuts compress the flange and holder together, generating clamping force that maintains joint integrity under mechanical loads, vibration, and pressure variations.
Materials
Typically made from carbon steel (ASTM A193 B7/B8), stainless steel (ASTM A193 B8/B8M), alloy steel, or specialized alloys for corrosive environments. Coatings include zinc plating, hot-dip galvanizing, or PTFE for corrosion resistance.
Technical Parameters
  • Length 50mm to 1000mm
  • Diameter M6 to M64
  • Proof Load 75% of tensile strength
  • Thread Pitch Standard coarse or fine threads
  • Tensile Strength 400 MPa to 1000 MPa
Standards
ISO 4014, ISO 4017, DIN 975, DIN 976, ASME B18.2.1

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Stud Bolts.

stud bolts double-ended bolts flange bolts holder assembly fasteners threaded rods industrial fasteners DIN studs ISO bolts Stud Bolts in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Holder/Flange Assembly

A mechanical assembly that secures and seals a rupture disc within a pressure system.

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Engineering Analysis

Risks & Mitigation
  • Thread stripping from over-torquing
  • Corrosion in harsh environments
  • Fatigue failure under cyclic loading
  • Improper alignment causing uneven stress
FMEA Triads
Trigger: Incorrect torque application
Failure: Joint loosening or bolt fracture
Mitigation: Use calibrated torque wrenches and follow torque specifications; implement torque audit procedures
Trigger: Material incompatibility
Failure: Galvanic corrosion
Mitigation: Select materials with similar galvanic potential or use insulating washers; apply protective coatings
Trigger: Vibration and dynamic loads
Failure: Fatigue cracking
Mitigation: Use lock nuts or thread-locking compounds; implement regular inspection schedules

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Thread tolerance: 6g for external threads per ISO 965-1; length tolerance: ±2mm for lengths ≤200mm, ±3mm for >200mm
Test Method
Tensile testing per ISO 898-1; hardness testing (Rockwell or Brinell); corrosion testing per ASTM B117; dimensional inspection per ISO 4759-1

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 stud bolts and regular bolts?

Stud bolts have threads on both ends and require two nuts, while regular bolts have a head on one end and threads on the other. Stud bolts allow for easier alignment in flange assemblies and prevent thread damage in base materials.

How do you determine the correct stud bolt length for a flange assembly?

Length = flange thickness + holder thickness + washer thickness + nut height + thread engagement (typically 1.5×diameter) + 3-5mm clearance. Always follow engineering drawings and standards.

Can stud bolts be reused?

Yes, if they show no signs of thread damage, corrosion, or elongation. However, critical applications often require replacement after disassembly due to stress relaxation and fatigue considerations.

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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