Bone Screw Thread Whirling Inserts
Full-profile carbide whirling inserts for HA shallow threads, HB deep threads and customer-specific bone screw profiles. Matching D12 six-insert cutter bodies are available for titanium alloy and implant-grade stainless steel machining.
- HA and HB standard profiles
- Custom profiles from drawings
- Four PVD coating options
- D12 six-insert cutter bodies
Full-Profile Inserts Designed Around the Complete Screw Geometry
OMTM bone screw whirling inserts are selected from the complete thread profile, not from pitch alone. The design review includes thread pitch, major diameter, minor diameter, flank angles, crest width, transition radii, thread hand, number of starts and the cutter-body setup.
- Triangular T16A insert platform with three usable cutting edges
- Standard HA and HB product range with defined ordering codes
- Custom insert profiles for proprietary orthopedic and implant screws
- Carbide grade, edge preparation and coating selected for the application
HA Shallow and HB Deep Bone Screw Threads
HA and HB are asymmetric metallic bone screw thread families. Each product must be confirmed from the full screw drawing and the actual whirling-head configuration.
HA Shallow-Thread Whirling Inserts
Full-profile inserts for shallow asymmetric HA thread geometry. The profile is defined by TP, Do, Di, r4, r5, crest width e and the reference helix angle beta.
HB Deep-Thread Whirling Inserts
Full-profile inserts for deep asymmetric HB thread geometry. The smaller minor diameter creates a deeper cutting profile and requires a dedicated insert geometry.
HA Insert Sizes and Ordering Codes
Dimensions are in millimetres. GXX indicates the selected carbide and coating grade.
| Product Name | Ordering Code | TP | Do | Di | r4 | r5 | e | beta |
|---|---|---|---|---|---|---|---|---|
| HA1.5 Whirling Insert | BWI-T16A-HA15-P050-RH-GXX | 0.50 | 1.50 | 1.10 | 0.30 | 0.10 | 0.10 | 7.3° |
| HA2.0 Whirling Insert | BWI-T16A-HA20-P060-RH-GXX | 0.60 | 2.00 | 1.30 | 0.40 | 0.10 | 0.10 | 6.9° |
| HA2.7 Whirling Insert | BWI-T16A-HA27-P100-RH-GXX | 1.00 | 2.70 | 1.90 | 0.60 | 0.20 | 0.10 | 8.1° |
| HA3.5 Whirling Insert | BWI-T16A-HA35-P125-RH-GXX | 1.25 | 3.50 | 2.40 | 0.80 | 0.20 | 0.10 | 7.9° |
| HA4.0 Whirling Insert | BWI-T16A-HA40-P150-RH-GXX | 1.50 | 4.00 | 2.90 | 0.80 | 0.20 | 0.10 | 8.1° |
| HA4.5 Whirling Insert | BWI-T16A-HA45-P175-RH-GXX | 1.75 | 4.50 | 3.00 | 1.00 | 0.30 | 0.10 | 8.6° |
| HA5.0 Whirling Insert | BWI-T16A-HA50-P175-RH-GXX | 1.75 | 5.00 | 3.50 | 1.00 | 0.30 | 0.10 | 7.6° |
HB Insert Sizes and Ordering Codes
HB profiles use a deeper asymmetric thread geometry and require a dedicated full-profile insert.
| Product Name | Ordering Code | TP | Do | Di | r4 | r5 | e | beta |
|---|---|---|---|---|---|---|---|---|
| HB4.0 Whirling Insert | BWI-T16A-HB40-P175-RH-GXX | 1.75 | 4.00 | 1.90 | 0.80 | 0.30 | 0.10 | 11.0° |
| HB6.5 Whirling Insert | BWI-T16A-HB65-P275-RH-GXX | 2.75 | 6.50 | 3.00 | 1.20 | 0.80 | 0.20 | 10.6° |
RH indicates a right-hand thread. Left-hand and customer-specific profiles are available after drawing review. Published dimensions are reference data; final insert compatibility must be confirmed before ordering.
How to Read the Insert Ordering Code
The ordering code identifies the insert platform, thread family, nominal diameter, pitch, thread hand and grade.
Coating Options for Titanium Alloy and Stainless Steel Machining
Coating selection is reviewed together with the exact workpiece grade, carbide substrate, edge preparation, coolant method and cutting conditions.
Titan-Legierungen
Application review focuses on cutting force, material adhesion, burr formation, heat concentration and cutting-edge stability.
Implant-Grade Stainless Steels
Application review focuses on work hardening, adhesive wear, chip control, edge strength and repeatable surface quality.
Custom Grade Selection
The final recommendation is based on the exact material designation, machine condition, coolant delivery and observed wear mode.
BWC12 / Z6 / T16A Six-Insert Cutter Platform
The BWC12 cutter platform uses a 12 mm cutting diameter, six insert pockets and the T16A insert platform. Multiple connection dimensions are available for internal, external and bayonet driven-tool interfaces.
- Cutting diameter DC: 12 mm
- Number of inserts NOF: 6
- Insert platform: T16A
- Supported profiles: HA, HB and custom
D12 Six-Insert Cutter Body Specifications
Dimension symbols follow the established cutter-body drawing convention: DC, DCON, DHUB, OAL, LUX, DCB, DBY and NOF.
| Product Name | Ordering Code | Connection | DC | DCON | DHUB | OAL | LUX | DCB | DBY | NOF |
|---|---|---|---|---|---|---|---|---|---|---|
| D12 External A Cutter 33/45 | BWC12-Z6-T16A-EA3345-L237 | External A | 12 | 33 | 45 | 23.7 | 15.5 | 40 | - | 6 |
| D12 Internal Cutter 37/46 | BWC12-Z6-T16A-I3746-L163 | Intern | 12 | 37 | 46 | 16.3 | 14.5 | 30.5 | - | 6 |
| D12 External A Cutter 38.5/55 | BWC12-Z6-T16A-EA3855-L380 | External A | 12 | 38.5 | 55 | 38.0 | 15.5 | - | - | 6 |
| D12 Internal Cutter 40/46-16.3 | BWC12-Z6-T16A-I4046-L163 | Intern | 12 | 40 | 46 | 16.3 | 14.5 | 32.5 | - | 6 |
| D12 Internal Cutter 40/46-16.8 | BWC12-Z6-T16A-I4046-L168 | Intern | 12 | 40 | 46 | 16.8 | 15.0 | 32.5 | - | 6 |
| D12 External A Cutter 40/49 | BWC12-Z6-T16A-EA4049-L158 | External A | 12 | 40 | 49 | 15.8 | 7.5 | 33 | - | 6 |
| D12 Bayonet Cutter 42/44 | BWC12-Z6-T16A-BY4244-L243 | Bayonet | 12 | 42 | 44 | 24.3 | 13.5 | - | 32 | 6 |
| D12 External A Cutter 42/49 | BWC12-Z6-T16A-EA4249-L138 | External A | 12 | 42 | 49 | 13.8 | 6.5 | 32 | - | 6 |
| D12 External B Cutter 42/53 | BWC12-Z6-T16A-EB4253-L445 | External B | 12 | 42 | 53 | 44.5 | 37.8 | 48 | - | 6 |
| D12 Bayonet Cutter 54/56 | BWC12-Z6-T16A-BY5456-L138 | Bayonet | 12 | 54 | 56 | 13.8 | 10.5 | - | 43.8 | 6 |
Cutter-body selection is based on the driven-tool brand, model and interface drawing. Dimensions should be confirmed before production.
Custom Bone Screw Whirling Insert Development
For proprietary profiles, the insert and cutter-body setup are reviewed as one machining system.
Drawing Review
Confirm TP, Do, Di, flank angles, radii, crest width, thread hand, starts and tolerances.
Material Review
Confirm the exact titanium alloy or stainless steel grade and material condition.
Machine Review
Confirm the machine, whirling head, cutter body, interface and coolant delivery.
Tool Design
Define the compensated profile, carbide grade, edge preparation and coating.
Trial and Approval
Evaluate profile accuracy, surface finish, burrs, insert wear and repeatability.
Information Required for a Quotation
Providing the following information allows a faster and more accurate tooling review.
Part and Thread Drawing
Complete bone screw drawing, enlarged thread profile, dimensions, tolerances, thread hand and number of starts.
Material and Quality Target
Exact material grade, hardness or condition, surface finish, burr requirement and current quality problem.
Machine and Tooling Setup
Machine model, whirling-head model, cutter-body or interface drawing, current insert sample and coolant method.
Häufig gestellte Fragen
Can HA and HB inserts be used interchangeably?
No. HA and HB threads have different depths, flank angles, diameters, radii and reference helix angles. The insert must match the complete profile.
Can one insert machine different bone screw sizes?
Only when the complete thread geometry and cutter-body setup are compatible. Pitch alone is not enough to confirm interchangeability.
Can the inserts machine titanium alloy and stainless steel?
Yes, but carbide grade, coating, edge preparation, coolant and cutting parameters must be reviewed for the exact material.
Are matching cutter bodies available?
Yes. The BWC12 D12 six-insert platform is available with several internal, external and bayonet connection dimensions.
What is needed for a custom insert?
Please provide the complete screw drawing, exact material grade, machine and whirling-head information, cutter-body details and the current machining target or problem.
Discuss Your Bone Screw Whirling Application
Send your drawing and tooling information directly from this page. OMTM will review the profile, material, cutter-body compatibility and suitable insert grade.
- Bone screw or thread-profile drawing
- Exact titanium alloy or stainless steel grade
- Machine and whirling-head information
- Current insert, cutter body or interface drawing
- Surface finish, burr or tool-life target
Send Your Application Details
Complete the form and attach the available drawing or product information.
