Integi

Integi is a specialist manufacturer of knurling, burnishing and rotary broaching tools, based in Zaldibar in the Basque Country of Spain. The company designs and manufactures all of its tools entirely in-house at its Zaldibar facility, giving it full control over quality and engineering.

Integi has built a worldwide reputation as a leading producer of knurling and burnishing solutions, with a product range that spans from simple conventional lathe knurling holders through to complex CNC, Swiss-type and multi-spindle tooling.

The brand is recognised for innovation, precision and durability in surface-finishing and form-imparting tooling.

This page covers the full Integi knurling & burnishing range.

It includes knurling toolholders (single-head, double-head and internal holders, for both form and cut knurling), knurling wheels in a wide range of diameters, widths, bores and profiles and the matching knurling wheels to suit each holder.

It also includes roller burnishing tools and diamond burnishing tools for surface-finishing applications.

The range covers workpiece diameters from as small as 3 mm up to 300 mm and includes wheels in pitches from 0.3 mm to 2 mm, allowing Integi to service everything from fine instrument work to large-diameter industrial components.

The Integi range includes several holder types to suit different knurling applications. Single-head form holders (such as the M8 and M10 series) use one knurling wheel and are suited to lighter, simpler knurling, including knurling up to a shoulder.

Double-head form holders (such as the M5 & M11 series) use two opposing wheels that balance the radial force, reducing workpiece deflection and producing cleaner, more consistent patterns (they are preferred for larger diameters and finer pitches).

Internal knurling holders (such as the M19 series) are designed for knurling the inside of bores. Cut-knurling holders use a cutting geometry rather than a forming geometry. Each holder type is supplied with hardened bushes and anti-wear surface treatments for long service life.

A single-head holder carries one knurling wheel, which presses against the workpiece from one side. This is simple, economical and effective for many applications, but the one-sided force pushes the workpiece away, which can cause deflection on slender parts and may produce a slightly uneven pattern.

A double-head holder carries two opposing wheels that squeeze the workpiece from both sides. The opposing forces largely cancel out, so workpiece deflection is minimised and the pattern is more consistent and accurate.

Double-head holders are preferred for fine pitches, larger diameters and components where deflection must be controlled.

Integi's double-head holders (such as the M11 series) also feature a pivoting head for self-centering of the knurls, which simplifies setup and improves pattern quality.

Knurling up to a shoulder means producing a knurled surface that runs right up to a step or shoulder on the workpiece (a feature that would prevent the knurling wheel from passing over it).

Standard knurling wheels and holders cannot reach into the corner adjacent to a shoulder because the wheel body would collide with the shoulder face. Integi holders designed for knurling up to a shoulder (such as the M10 and M11 series) use a wheel geometry and holder arrangement that allows the wheel to reach into the corner, producing a knurled surface that finishes cleanly at the shoulder.

This is a common requirement on shafts, spindles and components where a knurled grip section must terminate at a stepped feature.

Integi knurling wheels are available in a range of profiles to produce different surface patterns.

The 90-degree straight profile produces a straight (axial) knurl (ridges running along the length of the workpiece).

The 30-degree and 45-degree left-hand and right-hand profiles produce diagonal knurls running in one direction.

The 30-degree and 45-degree cross profiles (cross up and cross down) produce a diamond (cross-hatched) pattern, which is the most common knurl for grip applications because it provides grip in all directions.

The choice of profile determines the appearance and function of the knurled surface: straight and diagonal knurls give directional grip and a decorative linear appearance, while diamond (cross) knurls give non-directional grip and are the standard for hand-grip features.

Integi knurling wheels are available in pitches from 0.3 mm up to 2 mm.

The pitch is the distance between adjacent teeth on the knurling wheel and determines the spacing of the ridges on the knurled surface.

• Fine pitches (0.3 mm to 0.6 mm) produce a closely-spaced, fine-textured knurl suited to small-diameter components, instrument knobs and decorative finishes

• Medium pitches (0.7 mm to 1.2 mm) are the general-purpose range, suitable for most hand-grip and assembly-interlock applications

• Coarse pitches (1.5 mm to 2 mm) produce a heavy, aggressive knurl for large-diameter components and heavy-duty grip.

The correct pitch depends on the workpiece diameter, the intended function of the knurl and the material being knurled.

Integi knurling wheels are specified by three dimensions: diameter, width and bore.

• Diameter is the outside diameter of the wheel & Integi offers 10 mm, 15 mm, 20 mm, 21.5 mm and 25 mm diameters

• Width is the face width of the knurling portion and is available in 4 mm, 5 mm, 6 mm, 8 mm, 10 mm and 12 mm widths

• Bore is the central hole through which the wheel mounts on the holder pin and is available in 4 mm, 6 mm and 8 mm bores.

The wheel dimensions must match the holder's applicable wheel specification; for example, a holder accepting a 20×8×6 wheel requires a 20 mm diameter, 8 mm wide wheel with a 6 mm bore.

Selecting the correct wheel dimensions ensures the wheel fits the holder and produces the correct knurling geometry.

Selecting the correct Integi knurling tool requires knowing the workpiece diameter (which determines the holder series and the applicable wheel range), whether you need form or cut knurling, whether you need a single-head or double-head holder, the required knurl profile (straight, diagonal or diamond/cross), the required pitch and the applicable wheel dimensions (diameter x width x bore).

• For knurling up to a shoulder, a holder designed for that purpose is required.

• For internal knurling, an internal holder is needed (the material being knurled influences the choice between form and cut knurling and the wheel grade)

• For burnishing, the workpiece diameter and the required surface finish determine whether roller or diamond burnishing is appropriate.

Our engineers can advise on the correct Integi tool for your specific application.

Yes.

Our team includes time-served engineers who can help you select the correct Integi knurling or burnishing tool for your application.

Whether that's choosing between form and cut knurling, single-head and double-head holders, knurling up to a shoulder, internal knurling, selecting the correct wheel profile, pitch and dimensions, or specifying a roller or diamond burnishing tool for surface finishing.

We can advise on workpiece diameter ranges, material suitability and the relationship between knurl pitch and workpiece diameter.

You can reach us by phone, online chat or email and we will be happy to help you specify the correct Integi tooling for your job.