Cortical Screw TPI Self Tapping

The Cortical Screw TPI Self Tapping is a fully threaded bone screw for cortical fixation. Its self-tapping tip uses cutting flutes to form threads directly in a pre-drilled pilot hole. Because of this, the surgeon does not need a separate tapping step. The screw comes in sizes from 1.5 mm to 4.5 mm. It is made in premium German stainless steel and titanium. As a result, it covers a wide range of uses — from very small bone fixation to large-fragment plate systems.

Design and Self-Tapping Function

Cortical bone is the hard, dense outer layer of bone. Since it is harder than the softer inner bone, it needs screws with fine, closely spaced threads. For this reason, cortical screws have a smaller thread pitch than cancellous screws.

The self-tapping tip cuts its own thread path as the screw moves into the pilot hole. In turn, the surgeon skips the separate tapping step that standard cortical screws require. This simplifies the process where the fixation system and surgical plan allow it.

In addition, the fully threaded shaft grips bone along the whole screw length. For plate-and-screw systems, this gives even thread contact across the bone wall.

Available Diameters and Common Applications

This range covers six diameters. Each one targets a different bone type and plate system:

1.5 mm — for very small bone fixation and micro-fragment work
2.0 mm — for small bones of the hand and foot
2.4 mm — for small-bone fixation systems
2.7 mm — for small-fragment systems, including the radius, ulna, and hand bones
3.5 mm — for small- and medium-fragment plate systems, including the forearm and upper limb
4.5 mm — for large-fragment systems involving bones such as the femur and tibia

Above all, the surgical team should match the diameter to the plate system, bone size, and fracture type.

Size and Thread Details — 4.5 mm Diameter

The 4.5 mm size offers the widest range of options. Specifically, it comes in:

Lengths: 4 mm to 110 mm
TPI (threads per inch): 48 / 40 / 36 / 32 / 24 / 20

A higher TPI means finer, more closely spaced threads. A lower TPI, on the other hand, means a coarser thread pitch. As a result, buyers can choose the thread type that matches their fixation system.

For length and TPI details on the other sizes (1.5 mm through 3.5 mm), please contact us directly.

Material Options

These screws are made in two materials:

Premium German stainless steel — a well-known material in orthopedic implant making, widely used across surgical tools and implants
Titanium — an option that surgical teams choose based on the needs of the case

Moreover, material availability can vary by size and setup. Please confirm the material you need when placing an order or sending an enquiry.

Selection Guidance

Screw size, length, and thread pitch all affect how well the fixation works. Therefore, trained surgical teams should choose each option based on the plate system, bone size, fracture type, and surgical plan. This product is for use by qualified professionals in proper clinical settings.

Summary

The Cortical Screw TPI Self Tapping covers fixation needs from 1.5 mm micro-fragment work up to 4.5 mm large-fragment plate systems. For the 4.5 mm size, lengths run from 4 mm to 110 mm, and six TPI options are available. Both premium German stainless steel and titanium versions are offered. Contact us for full size details across the whole range.