Product Explanation
The Cortical Bone Screw, Self Tapping Ø 3.5 mm × 20 TPI is an orthopedic screw intended to form part of a compatible internal fixation construct.
A simplified fixation concept can be represented as:
Prepared Bone / Compatible Plate → 3.5 mm Cortical Screw → Thread Engagement → Internal Fixation Construct
The product is specifically identified as a:
Cortical Bone Screw
with a:
Self Tapping
design.
Its nominal diameter is:
Ø 3.5 mm
and its thread designation is:
20 TPI
The supplied product family covers screw lengths from:
10 mm to 90 mm
using two different length-increment ranges.
Product Components and Design
- Cortical Screw Body
The implant consists of a metallic screw body incorporating a threaded shaft, distal tip, and proximal screw head.
According to the supplied product designation, it is classified as a:
Cortical Bone Screw
The exact overall dimensions, core diameter, mechanical characteristics, and material standards should be confirmed from the manufacturer’s technical drawings.
- Ø 3.5 mm Nominal Diameter
The product title specifies:
Ø 3.5 mm
This represents the nominal screw diameter.
The supplied image does not separately define the major thread diameter, minor/core diameter, thread depth, or dimensional tolerances.
- 20 TPI Thread Specification
The screw is specifically identified as:
20 TPI
where TPI conventionally means:
Threads Per Inch
A 20 TPI thread corresponds mathematically to an axial thread pitch of approximately:
1.27 mm per thread
because:
25.4 mm ÷ 20 = 1.27 mm
This calculation follows the conventional definition of TPI. The manufacturer’s official thread drawing should still be used as the authoritative specification for the actual thread geometry.
- Self-Tapping Design
The product is specifically identified as:
Self Tapping
indicating a manufacturer-defined self-tapping tip / thread-entry configuration.
The exact cutting flute geometry, tip profile, thread-start design, and required drilling or tapping technique are not specified in the supplied image.
- Threaded Fixation Profile
The supplied image visibly shows a threaded shaft extending over a substantial portion of the screw body.
The exact thread depth, flank profile, threaded length, lead, and mechanical characteristics should be confirmed from the manufacturer’s engineering drawing.
- Screw Tip
The distal end incorporates a defined tip associated with the self-tapping screw design.
The exact tip angle, cutting geometry, and penetration characteristics cannot be reliably determined from the supplied image alone.
- Screw Head and Drive Interface
The supplied image shows a proximal screw head with an insertion interface.
However, the exact drive type is not specified.
Therefore, the product sheet should not identify the interface as Hex, Torx, Star, or another system without official technical documentation.
Length Configurations
According to the supplied image, two length ranges are provided.
Range 1 — 10–68 mm in 2 mm increments
This provides 30 lengths:
| No. | Length |
| 1 | 10 mm |
| 2 | 12 mm |
| 3 | 14 mm |
| 4 | 16 mm |
| 5 | 18 mm |
| 6 | 20 mm |
| 7 | 22 mm |
| 8 | 24 mm |
| 9 | 26 mm |
| 10 | 28 mm |
| 11 | 30 mm |
| 12 | 32 mm |
| 13 | 34 mm |
| 14 | 36 mm |
| 15 | 38 mm |
| 16 | 40 mm |
| 17 | 42 mm |
| 18 | 44 mm |
| 19 | 46 mm |
| 20 | 48 mm |
| 21 | 50 mm |
| 22 | 52 mm |
| 23 | 54 mm |
| 24 | 56 mm |
| 25 | 58 mm |
| 26 | 60 mm |
| 27 | 62 mm |
| 28 | 64 mm |
| 29 | 66 mm |
| 30 | 68 mm |
Range 2 — 70–90 mm in 5 mm increments
This provides 5 lengths:
| No. | Length |
| 31 | 70 mm |
| 32 | 75 mm |
| 33 | 80 mm |
| 34 | 85 mm |
| 35 | 90 mm |
Therefore, the complete product family contains:
35 length configurations
from:
10 mm to 90 mm
Material Options
According to the supplied product information, the screw is available in:
SS316L
and
Titanium
The exact Titanium alloy or grade is not specified in the supplied image and should be confirmed from the manufacturer’s official material documentation.
Intended Use
The Cortical Bone Screw, Self Tapping Ø 3.5 mm × 20 TPI is designed for use as part of a compatible orthopedic fixation system according to the approved indications, surgical technique, and Instructions for Use.
Potential applications may involve fixation through compatible orthopedic plates or other approved fixation components where a 3.5 mm cortical screw with the specified thread configuration is required.
The exact approved anatomical regions and compatible implant systems are not stated in the supplied image.
Screw selection may depend on factors including anatomical location, cortical bone dimensions, required screw length, fixation construct, compatible plate, bone quality, screw trajectory, drilling technique, compatible instrumentation, preoperative planning, and intraoperative measurement.
The screw should be selected and implanted by a qualified orthopedic surgeon in accordance with the approved surgical technique and Instructions for Use.
Key Benefits
Self-Tapping Screw Design
The product is specifically identified as:
Self Tapping
providing a defined thread-entry / tip configuration within the screw family.
The exact preparation requirements should be confirmed from the manufacturer’s surgical technique.
Ø 3.5 mm Nominal Diameter
The product provides a defined:
3.5 mm nominal screw diameter
within a compatible orthopedic fixation system.
20 TPI Thread Specification
The screw incorporates a specified:
20 TPI
thread configuration.
Under the conventional TPI definition, this corresponds to approximately:
1.27 mm thread pitch
The official technical drawing remains the authoritative source for thread geometry.
Wide Length Range
The product family covers:
10 mm to 90 mm
providing a broad selection of screw lengths.
Fine 2 mm Increments in the Short-to-Medium Range
From:
10 mm to 68 mm
the screw lengths increase in:
2 mm increments
providing closely spaced length options.
5 mm Increments in the Extended Length Range
From:
70 mm to 90 mm
the screw lengths increase in:
5 mm increments.
35 Length Configurations
The complete supplied range provides:
35 individual screw lengths
across the two specified length ranges.
Two Material Options
According to the supplied product data, the screw is available in:
SS316L
and
Titanium
Multiple Product Variants
Based strictly on the supplied information, the product family includes:
1 diameter × 35 lengths × 2 materials
which could theoretically represent:
up to 70 basic length × material configurations
if every listed length is commercially available in both SS316L and Titanium.
The actual commercial matrix should be confirmed from the official Cat. No. / GTIN table.
Technical Specifications
| Specification | Product Data |
| Product Name | Cortical Bone Screw, Self Tapping Ø 3.5 mm × 20 TPI |
| Product Type | Cortical Bone Screw |
| Design | Self Tapping |
| Nominal Diameter | Ø 3.5 mm |
| Thread Specification | 20 TPI |
| Calculated Conventional Thread Pitch | Approx. 1.27 mm |
| Overall Length Range | 10–90 mm |
| Range 1 | 10–68 mm |
| Range 1 Increment | 2 mm |
| Range 2 | 70–90 mm |
| Range 2 Increment | 5 mm |
| Number of Range 1 Lengths | 30 |
| Number of Range 2 Lengths | 5 |
| Total Number of Length Options | 35 |
| Materials | SS316L, Titanium |
| Potential Basic Configurations | Up to 70, subject to catalog confirmation |
| Thread Type | Cortical thread; detailed geometry not provided |
| Thread Depth | Not provided |
| Core Diameter | Not provided |
| Threaded Length | Not provided |
| Head Diameter | Not provided |
| Head Height | Not provided |
| Drive Interface | Not provided |
| Tip Geometry | Self-tapping; exact geometry not provided |
| Compatible Plate / Implant | Not provided |
| Compatible Drill Size | Not provided |
| Compatible Tap | Not provided |
| Compatible Screwdriver | Not provided |
| Titanium Grade | Not provided |
| Cat. No. | Not provided |
| GTIN No. | Not provided |
Technical Overview
Product Name: Cortical Bone Screw, Self Tapping Ø 3.5 mm × 20 TPI
Product Type: Orthopedic Cortical Bone Screw
Screw Design: Self Tapping
Nominal Diameter: Ø 3.5 mm
Thread Specification: 20 TPI
Conventional Calculated Pitch: Approximately 1.27 mm
Overall Length Range: 10–90 mm
10–68 mm Range: 2 mm increments
70–90 mm Range: 5 mm increments
Total Length Options: 35
Material Options: SS316L and Titanium
Fixation Concept: Threaded cortical bone fixation within a compatible orthopedic fixation construct
Thread Geometry: Partially specified by 20 TPI; detailed profile not supplied
Head / Drive Geometry: Not supplied
Compatible Implant System: Not supplied
Specific Titanium Grade: Not supplied
Compatible Instrumentation: Not supplied
Cat. No.: Not supplied
GTIN No.: Not supplied
Product Features
- Orthopedic cortical fixation screw.
- Specifically identified as a Self-Tapping Cortical Bone Screw.
- Nominal diameter of Ø 3.5 mm.
- Specified with 20 TPI thread density.
- Conventional calculated thread pitch of approximately 1.27 mm.
- Available from 10 mm to 90 mm.
- Uses 2 mm increments from 10 mm to 68 mm.
- Uses 5 mm increments from 70 mm to 90 mm.
- Provides 30 length options in the first range.
- Provides 5 length options in the second range.
- Provides 35 total length configurations.
- Available in SS316L.
- Available in Titanium.
- Features a threaded shaft.
- Features a defined distal screw tip.
- Features a proximal insertion head.
- Self-tapping characteristic identified in the supplied product name.
- Supports a broad screw-length selection within the same diameter family.
- Exact thread depth and core diameter should be confirmed from technical drawings.
- Exact head dimensions should be confirmed.
- Exact drive interface should be confirmed.
- Exact drilling requirements should be confirmed from the surgical technique.
- Exact compatible plate / implant system should be confirmed from official documentation.
- Exact Titanium alloy should be confirmed.
- Individual Cat. No. and GTIN No. should be added when the official product matrix is available.
Approved indications, contraindications, and insertion technique should be confirmed from the manufacturer’s Instructions for Use (IFU).
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