Tensioning Bolt: Length Range 20mm to 300mm

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 4014, ISO 4017, DIN 931, DIN 933, ASME B18.2.1

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.

View Product Details

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

Typical Suppliers & Equivalents

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

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Tensioning Bolt

Manufacturer profiles associated with Tensioning Bolt.

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Tensioning Bolt