Titanium Countersunk Bolts with Flush Head Design
Titanium countersunk bolts are specialized fasteners designed for applications where a flush surface, high mechanical strength, and corrosion resistance are required at the same time. Compared with conventional steel or stainless steel fasteners, titanium offers a unique balance of low weight, structural reliability, and long-term durability. These characteristics make titanium countersunk bolts increasingly relevant in aerospace, medical, marine, automotive, and high-precision manufacturing sectors.
Long Hung Titanium Countersunk Bolts Features
- Made from titanium or titanium alloy, which is strong, lightweight, and resistant to corrosion.
- The flat, angled head sits flush with the surface after installation, creating a smooth and clean finish.
- Provides high mechanical strength while being much lighter than steel fasteners.
- Performs well in marine, chemical, and outdoor environments without rusting.
- Manufactured with accurate threads for secure fastening and stable load holding.
- Typically supplied in Grade 2 for corrosion resistance or Grade 5 for higher strength.
- Maintains performance across low and high temperature conditions.
- Resistant to wear and environmental damage, reducing replacement frequency.
Specifications of Titanium Countersunk Bolts
Product tange: M1.6-M24
Length: 2-120 or custom
Material: GR2/GR5
Standard: DIN,GB,ISO,AISI,JIS,BSW,ASME
| Mon | M1 | M1.2 | M1.4 | M1.6 | M2 | M2.5 | M3 | M3.5 | M4 |
| P | 0.25 | 0.25 | 0.3 | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 |
| dk max | 1.9 | 2.3 | 2.6 | 3 | 3.8 | 4.7 | 5.6 | 6.5 | 7.5 |
| dk min | 1.76 | 2.16 | 2.46 | 2.86 | 3.5 | 4.4 | 5.3 | 6.14 | 7.14 |
| k max | 0.6 | 0.72 | 0.84 | 0.96 | 1.2 | 1.5 | 1.65 | 1.93 | 2.2 |
| n min | 0.31 | 0.36 | 0.36 | 0.46 | 0.56 | 0.66 | 0.86 | 0.86 | 1.06 |
| n max | 0.45 | 0.5 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1 | 1.2 |
| t min | 0.2 | 0.25 | 0.28 | 0.32 | 0.4 | 0.5 | 0.6 | 0.7 | 0.8 |
| t max | 0.3 | 0.35 | 0.4 | 0.45 | 0.6 | 0.7 | 0.85 | 1 | 1.1 |
| Mon | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M18 | M20 |
| P | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 |
| dk max | 9.2 | 11 | 14.5 | 18 | 22 | 25 | 29 | 33 | 36 |
| dk min | 8.84 | 10.57 | 14.07 | 17.57 | 21.48 | 24.48 | 28.48 | 32.38 | 35.38 |
| k max | 2.5 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| n min | 1.26 | 1.66 | 2.06 | 2.56 | 3.06 | 3.06 | 4.07 | 4.07 | 5.07 |
| n max | 1.51 | 1.91 | 2.31 | 2.81 | 3.31 | 3.31 | 4.37 | 4.37 | 5.37 |
| t min | 1 | 1.2 | 1.6 | 2 | 2.4 | 2.8 | 3.2 | 3.6 | 4 |
| t max | 1.3 | 1.6 | 2.1 | 2.6 | 3 | 3.5 | 4 | 4.5 | 5 |
| Mon | M1.6 | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 |
| P | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.25 |
| dk max | 3 | 3.8 | 4.7 | 5.6 | 6.5 | 7.5 | 9.2 | 11 | 14.5 |
| dk min | 2.75 | 3.5 | 4.4 | 5.3 | 6.14 | 7.14 | 8.84 | 10.57 | 14.07 |
| k max | 0.96 | 1.2 | 1.5 | 1.65 | 1.93 | 2.2 | 2.5 | 3 | 4 |
| No. | 0 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 4 |
| M | 1.7 | 2.35 | 2.7 | 2.9 | 3.9 | 4.4 | 4.6 | 6.6 | 8.7 |
| t max | 0.91 | 1.25 | 1.55 | 1.8 | 1.9 | 2.4 | 2.6 | 3.3 | 4.4 |
| t min | 0.66 | 0.95 | 1.25 | 1.5 | 1.4 | 1.9 | 2.1 | 2.8 | 3.9 |
| Mon | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 | M12 |
| P | 0.4 | 0.45 | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 |
| dk max | — | — | 6 | 8 | 10 | 12 | 16 | 20 | 24 |
| dk min | — | — | 5.7 | 7.64 | 9.64 | 11.57 | 15.57 | 19.48 | 23.48 |
| e min | — | — | 2.3 | 2.87 | 3.44 | 4.58 | 5.72 | 6.86 | 9.15 |
| k max | — | — | 1.7 | 2.3 | 2.8 | 3.3 | 4.4 | 5.5 | 6.5 |
| s min | — | — | 2.02 | 2.52 | 3.02 | 4.02 | 5.02 | 6.02 | 8.025 |
| s max | — | — | 2.1 | 2.6 | 3.1 | 4.12 | 5.14 | 6.14 | 8.175 |
| t max | — | — | 1.2 | 1.8 | 2.3 | 2.5 | 3.5 | 4.4 | 4.6 |
| t min | — | — | 0.95 | 1.55 | 2.05 | 2.25 | 3.2 | 4.1 | 4.3 |
What Are Titanium Countersunk Bolts
Titanium countersunk bolts are threaded fasteners manufactured from titanium or titanium alloys, featuring a flat head with a conical underside. The countersunk design allows the bolt head to sit flush with or slightly below the surface of the assembled material.
This flush profile is not only an aesthetic choice. It also reduces aerodynamic drag, avoids interference with moving parts, and improves safety in exposed assemblies. When combined with titanium as the base material, countersunk bolts deliver high performance in demanding environments.
Material Composition and Grades
Common Titanium Grades Used
Most titanium countersunk bolts are produced using the following grades:
Grade 2 (Commercially Pure Titanium)
This grade offers excellent corrosion resistance and good formability. It is commonly used in marine environments, chemical processing equipment, and architectural applications where strength requirements are moderate.
Grade 5 (Ti-6Al-4V Alloy)
Grade 5 is the most widely used titanium alloy for fasteners. It provides significantly higher tensile strength than Grade 2 while maintaining low weight and strong corrosion resistance. Aerospace, motorsport, and high-load industrial assemblies typically specify this grade.
Mechanical Properties
Compared with carbon steel fasteners, titanium countersunk bolts offer lower density and comparable strength, especially when Grade 5 is used. This strength-to-weight advantage is one of the primary reasons titanium fasteners are selected in weight-sensitive designs.
Titanium also maintains stable mechanical properties across a wide temperature range, which supports its use in both cryogenic and elevated-temperature environments.
Countersunk Head Design Explained
Head Angle Standards
The countersunk head geometry must match the countersink angle of the mating hole. The most common standards include:
- 82° countersunk angle: Common in inch-based standards
- 90° countersunk angle: Common in metric and aerospace standards
Selecting the correct angle is critical. A mismatch can cause uneven load distribution, poor seating, and premature loosening.
Drive Types
Titanium countersunk bolts are available with different drive options, including:
- Hex socket (Allen)
- Torx
- Slotted or Phillips (less common in high-load applications)
Hex socket and Torx drives are preferred in industrial settings because they provide better torque transfer and reduce the risk of cam-out during installation.
Key Advantages of Titanium Countersunk Bolts
High Strength with Low Weight
Titanium countersunk bolts offer substantial weight savings compared with steel fasteners. In applications where hundreds or thousands of bolts are used, this reduction can significantly impact overall system mass.
Corrosion Resistance
Titanium forms a stable oxide layer that protects the material from corrosion. This property is especially valuable in saltwater, chemical exposure, and humid environments where stainless steel may still suffer degradation.
Flush Surface Integration
The countersunk design allows components to maintain smooth external surfaces. This is essential in aerospace panels, rotating assemblies, and precision housings where protruding fasteners are unacceptable.
Long Service Life
Due to their resistance to corrosion and fatigue, titanium countersunk bolts typically offer a longer operational lifespan. This reduces maintenance frequency and total cost of ownership over time.
Typical Industrial Applications
Aerospace and Aviation
Titanium countersunk bolts are widely used in aircraft structures, interior panels, and aerodynamic surfaces. Their low weight and flush profile help reduce drag and improve fuel efficiency.
Medical and Surgical Equipment
Biocompatibility makes titanium bolts suitable for medical devices and implants. Countersunk bolts are often used in surgical instruments and orthopedic assemblies where smooth surfaces are required.
Marine and Offshore Equipment
In saltwater environments, corrosion resistance is a critical requirement. Titanium countersunk bolts perform reliably in shipbuilding, offshore platforms, and underwater equipment.
High-Performance Automotive and Motorsport
Weight reduction and vibration resistance are key priorities in motorsport. Titanium countersunk bolts are used in chassis components, brake systems, and aerodynamic parts.
Precision Machinery and Electronics
Flush-mounted fasteners are essential in compact equipment, housings, and enclosures where space constraints and surface alignment are critical.
Installation Best Practices
Proper Hole Preparation
The countersunk hole must match the bolt’s head angle and diameter. Poorly machined countersinks can lead to uneven seating and stress concentration.
Torque Control
Titanium fasteners require precise torque control. Over-tightening increases the risk of galling and thread failure. Torque values should follow manufacturer recommendations for the specific grade and size.
Use of Lubricants
Anti-seize compounds or approved lubricants reduce friction during tightening and minimize galling. This is particularly important for repeated assembly and disassembly.
Compatibility with Mating Materials
When used with aluminum or composite materials, titanium countersunk bolts help prevent galvanic corrosion. However, insulation or coatings may still be required in some environments.
Maintenance and Inspection
Titanium countersunk bolts generally require minimal maintenance. Periodic inspection should focus on:
- Signs of loosening in vibration-prone assemblies
- Thread condition during disassembly
- Surface damage caused by improper tooling
- Because titanium does not rust, visual inspection is often more reliable than with steel fasteners.
Frequently Asked Questions
1. Are titanium countersunk bolts stronger than stainless steel bolts
Grade 5 titanium countersunk bolts generally offer higher tensile strength than common stainless steel grades while being significantly lighter. Grade 2 titanium is closer to stainless steel in strength but offers better corrosion resistance.
2. Can titanium countersunk bolts be reused
They can be reused if threads and head geometry remain undamaged. Careful torque control and lubrication increase reusability.
3. Do titanium countersunk bolts require special tools
Standard hex or Torx tools are sufficient. However, high-quality tooling is recommended to avoid drive damage due to titanium’s hardness.
4. Are titanium countersunk bolts suitable for outdoor use
Yes. Their corrosion resistance makes them well suited for outdoor, marine, and exposed environments.
5. How do I prevent galling during installation
Use appropriate lubricants, apply controlled torque, and avoid dry assembly, especially when mating titanium with titanium.
Request a Quote Today for Long Hung’s Titanium Countersunk Bolts
Looking for reliable titanium countersunk bolts with precise flush head geometry and consistent quality? Long Hung supplies Grade 2 and Grade 5 titanium fasteners for aerospace, marine, and precision equipment applications. Share your drawings, specifications, or quantity requirements, and our team will respond with technical support and competitive pricing. Inquire today to start your project with confidence.
