Titanium Button Head Bolts Designed for Low-Profile Mounting
Button head bolts are engineered for applications where fastener head height, access limitations, and environmental conditions must be carefully controlled. The rounded button head design provides a lower profile, which helps prevent interference with adjacent components and improves surface safety during handling.
These bolts are manufactured from titanium support use in corrosive, marine, or weight-sensitive environments. Titanium button head bolts are supplied for wholesale orders and can be produced to custom specifications. Long Hung provides reliable fastening solutions for precision assemblies, enclosures, and secondary structural components.
Key Features of Titanium Button Head Bolts
- Low-profile button head design for clearance-sensitive assemblies
- Titanium alloy construction for corrosion resistance and weight reduction
- Internal hex drive for compact installation and controlled torque
- Flat bearing surface without the need for countersinking
- Suitable for custom manufacturing and wholesale supply
- Commonly used in aerospace, marine, precision machinery, and industrial equipment
Specifications of Long Hung Titanium Button Head Bolts
Product Range: M1.5-M20
Length: 2-120
Material: GR2/GR5
Standard: DIN,GB,ISO,AISI,JIS,BSW,ASME
| 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 |
| da max | 2.1 | 2.6 | 3.1 | 3.6 | 4.1 | 4.7 | 5.7 | 6.8 | 9.2 |
| dk max | 3.2 | 4 | 5 | 6 | 7 | 8 | 10 | 12 | 16 |
| dk min | 2.9 | 3.7 | 4.7 | 5.7 | 6.64 | 7.64 | 9.64 | 11.57 | 15.57 |
| r max | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 | 0.25 | 0.4 |
| No. | 0 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 4 |
| M | 1.8 | 2.5 | 2.7 | 3.1 | 4.2 | 4.6 | 5.3 | 6.8 | 9 |
| t min | 0.72 | 1.1 | 1.3 | 1.7 | 1.74 | 2.04 | 2.77 | 3.03 | 4.18 |
| t max | 1.02 | 1.4 | 1.6 | 2 | 2.24 | 2.54 | 3.27 | 3.53 | 4.68 |
| h max | 1.42 | 1.72 | 2.12 | 2.52 | 2.82 | 3.25 | 3.95 | 4.75 | 6.15 |
| h min | 1.18 | 1.48 | 1.88 | 2.28 | 2.58 | 2.95 | 3.65 | 4.45 | 5.85 |
| k | 0.8 | 1.1 | 1.3 | 1.6 | 1.9 | 2 | 2.5 | 3 | 3.7 |
| Mon | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M16 |
| P | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 |
| da max | 3.6 | 4.7 | 5.7 | 6.8 | 9.2 | 11.2 | 13.7 | 17.7 |
| dk max | 5.7 | 7.6 | 9.5 | 10.5 | 14 | 17.5 | 21 | 28 |
| dk min | 5.4 | 7.24 | 9.14 | 10.07 | 13.57 | 17.07 | 20.48 | 27.48 |
| e min | 2.3 | 2.87 | 3.44 | 4.58 | 5.72 | 6.86 | 9.15 | 11.43 |
| k max | 1.65 | 2.2 | 2.75 | 3.3 | 4.4 | 5.5 | 6.6 | 8.8 |
| k min | 1.4 | 1.95 | 2.5 | 3 | 4.1 | 5.2 | 6.24 | 8.44 |
| r min | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 | 0.4 | 0.6 | 0.6 |
| s max | 2.045 | 2.56 | 3.071 | 4.084 | 5.084 | 6.095 | 8.115 | 10.115 |
| s min | 2.02 | 2.52 | 3.02 | 4.02 | 5.02 | 6.02 | 8.025 | 10.025 |
| t min | 1.04 | 1.3 | 1.56 | 2.08 | 2.6 | 3.12 | 4.16 | 5.2 |
What Are Titanium Button Head Bolts
Titanium button head bolts are fasteners manufactured from titanium alloy and finished with a rounded, low-profile head and an internal hex drive. The defining characteristic is the button head geometry, which sits lower than a socket head cap screw while maintaining a flat bearing surface.
These bolts are commonly produced in metric sizes and used in assemblies where clearance, surface safety, or visual cleanliness is required. Titanium is selected when the application also demands corrosion resistance, weight reduction, or non-magnetic properties.
Why Choose a Button Head Design in Titanium Fasteners
The decision to use a button head bolt is driven primarily by geometry and assembly constraints, not material alone.
Button head bolts are selected when:
- Head height must be minimized
- External wrench clearance is limited
- Protruding edges must be reduced
- A smooth or low-interference surface is required
Button Head Geometry and Functional Characteristics
Low-Profile Head Structure
The button head has a shallow, domed profile that reduces protrusion above the mounting surface. Compared with socket head cap screws, the head height is significantly lower, which helps avoid interference with nearby components or moving parts.
This geometry is particularly useful in compact assemblies, enclosures, and equipment where fasteners are exposed or frequently handled.
Flat Bearing Surface
Unlike countersunk screws, titanium button head bolts seat against a flat mating surface. This eliminates the need for countersinking or chamfering, reducing machining steps during assembly.
The bearing surface is smaller than that of flange bolts, so surface pressure is higher. In softer materials, washers are often used to distribute load.
Internal Hex Drive and Torque Behavior
Titanium button head bolts typically use an internal hex drive, which allows installation in restricted spaces and protects the drive from external impact.
However, due to the reduced head height, the drive depth is shallower than that of socket head cap screws. This limits the maximum transferable torque and directly affects achievable preload.
As a result, button head bolts are not intended for high-preload joints. They are designed for moderate clamp loads where geometry is the primary concern.
Load Performance and Joint Design Considerations
Clamp Load Capability
Compared with socket head or hex head bolts of the same thread size, titanium button head bolts generate lower maximum clamp force. This is a direct consequence of head geometry and torque limits.
Designers should not substitute a button head bolt into a joint designed for higher preload without adjusting fastener size, quantity, or joint design.
Shear and Alignment Applications
Button head bolts perform well in shear-dominant joints, especially where alignment and clearance are critical. The rounded head reduces stress concentration and minimizes snagging in exposed assemblies.
Titanium as the Material Context
Why Titanium Is Used
Titanium is selected for button head bolts when the application requires:
- Corrosion resistance in marine or chemical environments
- Weight reduction in moving or transport-sensitive assemblies
- Non-magnetic behavior in electronic or instrumentation systems
The material supports the function of the button head design rather than defining it.
Common Titanium Alloy
Most titanium button head bolts are produced from Ti-6Al-4V alloy, which provides sufficient strength for button head geometry while maintaining good fatigue resistance and machinability.
Comparison with Other Titanium Bolt Head Types
Button Head vs Titanium Socket Head Cap Screws
Socket head cap screws support higher torque and preload. Button head bolts reduce head height and improve clearance. The choice depends on whether load capacity or geometry is the dominant constraint.
Button Head vs Titanium Countersunk Screws
Countersunk screws sit flush but require countersinking of the mating surface. Button head bolts avoid this machining step while still keeping a relatively low profile.
Button Head vs Titanium Hex Head Bolts
Hex head bolts allow easy torque application but require more clearance. Button head bolts are preferred in compact or enclosed assemblies.
Typical Applications of Titanium Button Head Bolts
Titanium button head bolts are commonly used in applications where profile, access, and environmental resistance matter more than maximum clamp force.
Typical use cases include:
- Aerospace interior structures and secondary assemblies
- Motorsport and performance vehicle brackets
- Marine and offshore equipment
- Precision machinery and instrument frames
- Electronic enclosures and sensor mounts
