Flexible Shaft Carbide Burrs

Flexible shaft carbide burrs for internal grinding, deburring, and surface finishing in curved pipes, valve bodies, deep cavities, and other hard-to-reach internal areas. Available with standard carbide burr head shapes and flexible spring shafts up to 1000 mm for applications where rigid shank tools cannot follow the required path.

Flexible Shaft Carbide Burrs for Curved Internal Surfaces

Persistools flexible shaft carbide burrs are designed for grinding, deburring, weld removal, and surface finishing inside curved pipes, valve bodies, internal passages, deep cavities, and other restricted areas where conventional rigid-shank rotary burrs cannot reach effectively.

The cutting head uses conventional tungsten carbide burr geometry, while the extended shaft uses a flexible spring-type construction that allows the tool to follow curved or offset internal paths.

Custom overall lengths can be produced up to approximately 1000 mm, depending on burr size, shaft construction, application, and operating conditions.

Designed for Curved and Restricted Access

Rigid long-shank carbide burrs are suitable when the cutting point is deep but can still be reached along a relatively straight path.

Flexible shaft burrs are intended for applications where the working position is:

Curved
Offset from the tool axis
Located behind an obstruction
Deep inside a pipe or valve body
Difficult to access with a rigid shaft

Typical applications include:

Pipe internal grinding
Valve body finishing
Internal casting cleanup
Weld removal inside pipes
Deep cavity deburring
Internal passage finishing
Foundry and casting repair
Maintenance of fluid-handling components

Flexible Spring Shaft

The spring-type shaft provides flexibility during operation and can accommodate a certain amount of misalignment or curvature inside the workpiece.

Compared with a rigid extended shank, the flexible shaft can also absorb part of the cutting shock and vibration generated during intermittent grinding.

However, flexibility also means that the tool can deflect, whip, or bounce if it is operated incorrectly.

For this reason, proper:

Tool clamping
Shaft support
Operating speed
Feed pressure
Working length

are especially important when using long flexible-shaft burrs.

Standard Carbide Burr Head Shapes

Flexible shaft burrs can be supplied with common carbide burr head profiles, including standard A–N / SA–SN style shapes, depending on the required working area.

Typical head styles include:

Cylindrical
Ball
Ball nose cylindrical
Oval
Tree radius
Tree pointed
Flame
Cone
Tapered radius
Custom profiles

Different cutting geometries can also be supplied, including:

Single Cut
Double Cut
Aluminum Cut / Non-Ferrous Cut
Custom flute geometry

Custom Lengths and Configurations

Flexible shaft carbide burrs are usually application-specific products.

Persistools can manufacture tools according to:

Required overall length
Flexible shaft length
Shaft diameter
Burr head shape
Burr diameter
Cut type
Workpiece material
Pipe or valve geometry
Required access path
Machine or grinder type

For very long flexible-shaft tools, the shaft construction and operating parameters should be matched carefully to the actual working conditions to maintain safe and stable grinding performance.

Burr Head Type	Head Diameter	Shaft Type	Overall Length	Cut Type	Typical Application
Cylindrical	Ø6–12 mm	Flexible Spring Shaft	200–400 mm	Single / Double	Pipe internal grinding
Ball	Ø6–12 mm	Flexible Spring Shaft	200–500 mm	Single / Double	Valve cavities
Ball Nose Cylindrical	Ø8–16 mm	Flexible Spring Shaft	300–600 mm	Double	Curved internal passages
Tree Radius	Ø8–16 mm	Flexible Spring Shaft	300–700 mm	Single / Double	Internal contour finishing
Flame	Ø8–16 mm	Flexible Spring Shaft	400–800 mm	Double	Deep valve body grinding
Custom Head	Custom	Flexible Spring Shaft	Up to 1000 mm	Single / Double / Aluminum Cut	Special curved-access applications

Product Type: Flexible Shaft Carbide Burr
Cutting Head: Tungsten Carbide
Shaft: Flexible Spring-Type Steel Shaft
Maximum Length: Up to Approx. 1000 mm
Head Shapes: Standard A–N / SA–SN Types / Custom
Cut Types: Single Cut / Double Cut / Aluminum Cut
Application: Pipe / Valve / Internal Passage / Deep Cavity Grinding
Customization: Head shape, diameter, shaft diameter, flexible length, overall length, and cut geometry available on request.

What are flexible shaft carbide burrs used for?

Flexible shaft carbide burrs are used for grinding, deburring, weld removal, and finishing inside curved pipes, valve bodies, internal passages, and other areas that cannot be reached effectively with rigid-shank tools.

What is the difference between a flexible shaft burr and a long rigid-shank burr?

A long rigid-shank burr provides extended reach along a relatively straight path. A flexible shaft burr can bend and follow curved or offset internal paths, making it more suitable for pipes, valve bodies, and complex internal cavities.

Can flexible shaft carbide burrs reduce vibration?

The flexible spring shaft can absorb part of the cutting shock and misalignment during grinding. However, because the shaft can also deflect and bounce, proper clamping, shaft support, speed control, and feed pressure are important for stable operation.

What lengths and burr head shapes are available?

Flexible shaft carbide burrs can be manufactured up to approximately 1000 mm overall length, depending on the shaft and application. Standard A–N / SA–SN carbide burr head shapes, multiple diameters, and different cut geometries are available.

If the above questions do not solve your doubts, please contact us through email or phone as well!

Persistools is fully committed to pursuing maximum efficiency in customer service and delivering premium customer experience. Whether you have pre-sales questions or encounter after-sales issues, you will receive our swift reply at all times. Our team always stays positive and dedicated to solving problems effectively.