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Line Boring Bars for Portable Line Boring Machines

JDA Machinery manufactures line boring bars for portable line boring systems, with standard 40 mm and 50 mm diameters and custom configurations for equipment replacement and application-specific machining. For repair contractors, maintenance teams, and equipment service providers, we support boring bar selection based on required machining length, bearing support layout, drive connection, and tool mounting requirements.

Whether you need a replacement bar or a custom configuration, provide your existing equipment details or technical drawings for compatibility assessment.

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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Boring Bar Dimensions and Machine Compatibility

A replacement boring bar must match the machine interfaces and provide sufficient working length for the required machining span. Check the following dimensions against your existing equipment or approved drawings.

Selection Item	What to Confirm
Bar Diameter	Nominal diameter and compatibility with bearing supports and tooling
Overall and Working Length	Installation space, machining span, and tool positioning
Drive Connection	Coupling type, drive-end dimensions, keyway, and engagement features
Bearing Supports	Support diameters, bearing positions, spacing, and required fits
Tool Mounting	Tool holder dimensions, fixing method, and clearance for the cutting assembly

Bar Rigidity and Dimensional Accuracy

Bar diameter alone does not determine machining performance. Unsupported length, bearing support arrangement, bar straightness, radial runout, and cutting conditions all influence rigidity and machining stability.

For long machining spans or applications with limited support, the bar configuration should be evaluated against the required bore geometry and cutting conditions. Specify any required straightness, runout, or dimensional tolerances in the technical drawing or purchase specification so these requirements can be reviewed before production.

Custom Line Boring Bars

When standard configurations do not match your equipment, JDA Machinery can assess custom boring bar requirements using application details, existing components, or technical drawings.

Customization Item	Information Required
Dimensions	Required diameter, overall length, and working length
Drive Interface	Connection dimensions, coupling arrangement, and keyway details
Support Layout	Bearing support diameters, positions, and spacing
Tool Mounting	Tool holder dimensions, fixing method, and tooling requirements
Material and Tolerances	Required material grade, dimensional tolerances, straightness, and runout
Special Features	Stepped sections, modified ends, or other drawing-defined geometry

FAQ

Q: Can I order a replacement boring bar without a complete drawing?

A: Yes. An existing bar, equipment model, measured dimensions, or clear photographs can support an initial assessment. Critical dimensions and connection interfaces must still be verified before the final specification is approved.

Q: How should I inspect a new boring bar upon delivery?

A: Compare the delivered bar with the approved drawing or purchase specification. Check overall dimensions, drive-end features, bearing support dimensions, and tool mounting interfaces. Verify straightness and radial runout when these are specified in the order.

Q: How can I simplify future replacement orders?

A: Keep the part number, approved drawing and revision, equipment model, and key interface dimensions in your maintenance records. Reference the original order when requesting a repeat supply to reduce the risk of dimensional or interface mismatches.

Q: What should I provide if the delivered bar does not match the specification?

A: Provide the order reference, approved drawing, measured dimensions, and clear photographs of the affected features. Identify the discrepancy and contact JDA Machinery so the issue can be reviewed against the agreed specification.

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