Drive Flange: Bolt Size M16-M36, Diameter 200-500 mm

Component Specifications

Definition

The drive flange is a critical interface component in kelly bar assemblies used in drilling rigs, designed to securely connect the kelly bar body to the rotary drive mechanism. It transmits rotational torque from the drive system to the kelly bar while maintaining precise alignment and structural integrity under high torsional loads. The flange typically features a circular plate with precisely machined bolt holes, keyways, or splines for positive engagement, and may include sealing surfaces to prevent contamination ingress.

Working Principle

The drive flange operates on the principle of mechanical torque transmission through positive engagement. When mounted between the rotary drive mechanism and the kelly bar body, it converts rotational force from the drive system into torque that rotates the kelly bar. The flange's design ensures even distribution of stress across the connection points, minimizing stress concentrations that could lead to fatigue failure. Precision machining of mating surfaces ensures minimal backlash and vibration during operation.

Materials

Typically forged or machined from high-strength alloy steels such as AISI 4140, 4340, or similar grades with minimum yield strength of 550 MPa. Heat treatment processes include quenching and tempering to achieve hardness of 28-32 HRC. Corrosion-resistant coatings or plating may be applied for harsh environments.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Weight	15-120 kg
Diameter	200-500 mm
Bolt Size	M16-M36
Thickness	25-60 mm
Bolt Circle Diameter	180-450 mm
Number Of Bolt Holes	6-12
Maximum Torque Capacity	10,000-50,000 Nm
Operating Temperature Range	-20°C to 150°C

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 2768, DIN 6885, API Spec 7-1, ISO 286-2

Parent Products

This component is used in the following industrial products

Kelly Bar Body

The main structural component of a Kelly Bar that transmits torque and axial loads during drilling operations.

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Engineering Analysis

Risks & Mitigation

Fatigue cracking under cyclic loading
Bolt loosening due to vibration
Misalignment causing premature wear
Corrosion in harsh environments
Over-torque leading to deformation

FMEA Triads

Trigger: Improper bolt torque during installation
Failure: Bolt loosening leading to uneven load distribution and eventual flange failure
Mitigation: Implement torque verification procedures using calibrated tools and follow manufacturer's torque specifications precisely

Trigger: Material fatigue from cyclic loading
Failure: Crack initiation and propagation leading to catastrophic failure
Mitigation: Regular non-destructive testing (NDT) inspections, proper material selection with adequate fatigue strength, and design optimization to reduce stress concentrations

Trigger: Misalignment between mating components
Failure: Premature wear, vibration, and reduced torque transmission efficiency
Mitigation: Precision machining of mating surfaces, use of alignment tools during installation, and regular alignment checks during maintenance

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

H7/h6 for bore fits, ±0.1 mm for bolt hole positions, flatness within 0.05 mm over entire surface

Test Method

Ultrasonic testing for internal defects, magnetic particle inspection for surface cracks, dimensional verification using CMM, torque testing to verify bolt preload capacity

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 Drive Flange

Manufacturer profiles associated with Drive Flange.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of a drive flange in kelly bar systems?

The drive flange serves as the critical connection point that transmits rotational torque from the drive mechanism to the kelly bar body while maintaining precise alignment and structural integrity under high loads.

How often should drive flanges be inspected in drilling operations?

Drive flanges should be visually inspected daily for cracks or deformation, with detailed dimensional and NDT inspections recommended every 500-1000 operating hours or according to manufacturer specifications.

What are common signs of drive flange wear or failure?

Common indicators include visible cracks, elongation of bolt holes, excessive vibration during operation, abnormal noise from the connection point, and increased backlash in the drive system.

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.

Drive Flange