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High-Precision Line Boring Accessories for Portable Machining

Upgrade your on-site machining setups with JDA’s heavy-duty line boring accessories. Engineered from high-tensile alloy steel and heat-treated for maximum structural rigidity, our accessories deliver smooth cutting performance, zero-deflection alignment, and tight manufacturing tolerances under extreme jobsite conditions.

Whether you are restoring worn pin holes on heavy earthmoving equipment or performing precision flange facing in a shipyard, JDA accessories ensure rapid setup times, operational safety, and shop-quality results directly in the field.

Line Boring Shaft
JDA Line Boring Shaft is a shaft used in portable line boring machines to support and drive the cutting tool during on-site bore repair.
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Large Boring Bar
JDA Large Boring Bar is a boring bar for portable line boring machines, used to machine large-diameter bores in heavy equipment, with standard diameters including 110, 150 and 200 mm and custom...
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40mm Boring Bar
The JDA 40 mm Line Boring Bar is a steel shaft for small portable line boring machines. It supports cutting tools during on-site repair of worn bores in compact construction equipment and...
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50mm Boring Bar
The JDA 50 mm Line Boring Bar is an alloy steel bar for compatible portable line boring machines. It supports boring tools during on-site repair of worn bores in heavy equipment and industrial...
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Line Boring Facing Tool
JDA Line Boring Facing Tool is an attachment for portable line boring machines, designed to machine flange faces, bore end faces, mounting surfaces and other flat mating surfaces on large equipment.
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Line Boring Facing Head
The JDA FH60 Line Boring Facing Head is an attachment for portable line boring machines, designed for on-site machining of flange faces and mounting surfaces around existing bores. With a maximum...
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Facing Head for Boring Machine
The JDA FH50N Facing Head is an attachment for portable line boring machines, designed to machine flange faces, bearing housing faces and other flat surfaces around existing bores. It mounts on...
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Explore Our Line Boring Accessories

Line Boring Bars

JDA line boring bars are manufactured from high-tensile chrome-moly alloy steel (42CrMo/4140), induction hardened and precision ground to standard tolerances (h6/h7). Designed with strategically spaced tool holes, they deliver minimum flex and zero chatter during heavy-roughing or fine-finishing passes.

Specifications & Sizes: Diameters ranging from Ø30mm to Ø100mm+; standard and custom lengths available up to 3,000mm.

Features: Precision 12mm / 16mm / 20mm square tool holes, dual-end mounting capacity, high torsional strength, and corrosion-resistant surface treatment.

Primary Uses: Deep hole alignment, hinge pin hole repair, gear casing re-boring, and multi-span heavy equipment shaft housing restoration.

Facing Heads

Our heavy-duty facing head attachments convert your portable line boring setup into a versatile facing machine. Designed with smooth auto-feed mechanisms and rigid tool slides, JDA facing heads execute precise flat, stepped, or counterbore machining on damaged flange surfaces and shaft shoulders.

Working Diameters: Facing capacities spanning from Ø80mm up to Ø600mm+.

Features: Adjustable mechanical feed rates, continuous auto-feed radial motion, rigid tool posts accepting standard carbide inserts, and quick-clamping mounting hubs.

Primary Uses: Excavator bucket hinge facing, pump and valve seat resurfacing, gearbox housing end-face repair, and marine shaft flange re-facing.

Specifications and Configuration Options

Line Boring Bar Specifications

Specification	Selection considerations
Bar diameter	Required bore size, tool clearance and bar rigidity
Working length	Machining span and support positions
Tool hole size	Compatible tool holder and cutting tool dimensions
Tool hole spacing	Required cutting positions and machining access
Material	Application requirements and approved product specification
Surface treatment	Applicable wear, corrosion and manufacturing requirements
Mounting configuration	Machine interface and support arrangement

Facing Head Specifications

Specification	Selection considerations
Facing diameter	Required machining diameter and model capacity
Feed mechanism	Required feed method and available machine configuration
Tool holder	Compatible holder and cutting insert arrangement
Drive connection	Machine output and accessory interface
Mounting arrangement	Available clearance and installation requirements
Custom options	Non-standard dimensions or interface requirements, subject to feasibility

Custom Line Boring Accessories

Boring bar dimensions
Non-standard diameters, lengths or other dimensional requirements can be assessed against the required machining span and product design.

Tool hole arrangement
Tool hole dimensions, spacing and positioning may be adjusted where the design and manufacturing process permit.

Mounting interfaces
Custom mounting dimensions, drive connections or adapters can be evaluated to address specific machine interface requirements.

Facing head configuration
Facing diameter, mounting arrangements and tool holder configurations can be assessed according to the required operation and available product design.

Supporting components
Brackets, mounting blocks and other related components can be reviewed according to the workpiece geometry and installation conditions.

How to Submit a Custom Requirement

Step 1: Describe your application

Explain which component needs machining, the operation required and the problem the accessory must solve.

Step 2: Provide dimensions and technical information

Submit dimensioned drawings, machine interface details, existing component measurements or clear photographs. Include the required quantity and any relevant operating conditions.

Step 3: Engineering evaluation

The engineering team reviews the dimensions, mounting connections, working clearance and intended configuration. Additional information may be requested if critical dimensions are missing.

Step 4: Confirm the design

Before production, agree on the applicable dimensions, material, tolerances, interface details and inspection requirements.

Step 5: Determine whether sampling is necessary

A prototype or sample may be appropriate for new interfaces, non-standard geometry or critical fitment requirements. For an established design with confirmed drawings, sampling may not be necessary.

Step 6: Proceed with production

After technical approval, the order can proceed according to the confirmed specifications, production arrangements and agreed inspection requirements.

Quality Control

Material Verification
Material grades and treatment requirements should be confirmed against the applicable product specification. Where available and required, supporting material documentation can be reviewed as part of the order requirements.

Dimensional Inspection
Critical dimensions may include bar diameter, overall length, tool hole dimensions, mounting features and drive interfaces. Inspection methods and acceptance limits should correspond to the approved drawing and applicable tolerances.

Straightness and Runout Checks
Where relevant to the component design, straightness or runout may be checked against specified acceptance criteria. These checks help assess dimensional condition but do not independently guarantee machining accuracy under every operating condition.

Interface Verification
Mounting and drive connections should be checked against the approved dimensions and intended mating components. For custom accessories, this may include comparison with customer drawings or agreed reference components.

Final Inspection
Applicable dimensions, surface condition and order specifications should be reviewed according to the agreed inspection plan before shipment.

FAQ

Q: How do I choose the correct line boring bar diameter?

A: Choose a diameter that accommodates the required bore size and cutting tool while providing suitable rigidity for the working span. Support positions, cutting forces, material properties and available clearance also affect the selection.

Q: Are JDA accessories compatible with other brands of portable line boring machines?

A: Compatibility depends on the machine model, drive connection, mounting dimensions and accessory design. Some configurations may be compatible, while others may require an adapter or custom interface.

Q: What cutting tools can be used with line boring bars?

A: Tool compatibility depends on the tool hole dimensions, holder design, clamping method and available clearance. Depending on the selected configuration, compatible square-shank tool holders or holders for indexable cutting inserts may be used.

Q: Can JDA manufacture custom boring bars and facing heads?

A: Custom requirements can be evaluated for dimensions, tool hole arrangements, mounting interfaces and facing head configurations, subject to technical and manufacturing feasibility. Provide drawings, required dimensions, machine interface information and the intended application to begin the assessment.

Q: When should I request a prototype or sample?

A: Sampling is worth considering when a design includes an unverified interface, non-standard geometry or a critical fitment requirement. For established configurations with confirmed drawings, a prototype may not be necessary. Sample availability, validation requirements, cost and lead time should be confirmed during the quotation process.

As one of the most professional line boring accessories manufacturers and suppliers in China, our products have good reputation in the market. Please rest assured to buy cheap line boring accessories for sale here from our factory. Quality products and reasonable price are available.