When nickel, titanium or zirconium alloys are not enough...
- Immune to numerous acids and chemicals (corrosion tables)
- Better corrosion resistance than nickel alloys, titanium or zirconium
- High strength and stiffness in vacuum and inert gas up to 2000°C (3600°F)
- Can become brittle when used in oxygen above 300°C
- High purity and biocompatibilty
- Physical Properties
- Tantalum grades, specifications and chemistry
- Tantalum shoulder bolt features and benefits
Tantalum shoulder bolts are best known for its unmatched corrosion resistance and chemical inertness. Tantalum bolts have a similar corrosion resistance to that of glass, but all of the typical mechanical and electrical properties of a metal.
Tantalum shoulder bolts are also extremely stable at high temperatures, since tantalum has a melting point around 3000°C. High temperature applications require vaccum or inert gas since tantalum may embrittle when used in oxygen rich environments above 250°C. Tantalum bolts are also one of the most bio-compatible metals available and is also radio-opaque due to its high density (16.68 g/cm3).
All tantalum shoulder bolts are available in commercially pure tantalum and tantalum 2.5% tungsten (Ta-2.5%W).
Contact us to see if your required tantalum bolts are in stock and how our engineers may help you with your tantalum fastener application.
Resources: Tantalum Torque Spec
Tantalum shoulder bolts, also called stripper bolts are a unique fastener with three main parts: head, shoulder, and thread. The head has the largest diameter and is where the torque is applied, typically with a socket driver. The shoulder is smooth and unthreaded, and has a set diameter and length. The shoulder’s role is to act as a shaft or dowel for rotating parts, axles for rolling parts, guides for sliding elements, and pivot points. The final part of a tantalum shoulder bolt is the threaded shaft. The threaded portion of a shoulder bolt has a major diameter slightly smaller than the shoulder diameter.
Tantalum (Commercially Pure)
Commercially pure tantalum metal is 99.95% pure tantalum has some o the best corrosion resistant properties of any metal. While its corrosion resistance is exceptional, it is relatively soft and mechanically similar in strength to copper.
Tantalum Specifications: UNS R05200, ASTM B521, B708
Tantalum 2.5% Tungsten (Ta-2.5W)
This grade of tantalum alloyed with 2.5% tungsten provided better overall strength while maintaining its exception corrosion resistant properties. For tantalum fastener applications this is usually preferred.
Tantalum 2.5% Tungsten Specifications: UNS R05252, ASTM B521, B708
- Density 16.6 g/cc
- Melting Point 3290 K, 2996°C, 5462°F
- Boiling Point 5731 K, 6100°C, 9856°F
- Coefficient of Thermal Expansion (20°C) 6.5 x 10(-6) / °C
- Electrical Resistivity (20°C) 13.5 microhms-cm
- Electrical Conductivity 13% IACS
- Specific Heat .036 cal/g/°C
- Thermal Conductivity .13 cal/cm(2)/cm°C/sec
TANTALUM SHOWS A NIL CORROSION RATE TO THE FOLLOWING MEDIA
For all temperatures up to at least 302F (150C) unless otherwise indicated
Chlorine, dry, <250°C (480°F)
TANTALUM SHOWS LIMITED CORROSION RESISTANCE TO THE FOLLOWING MEDIA
Hydrogen, >300°C (570°F)Hydrogen fluoride
Potassium hydroxide, conc.
Sodium hydroxide, conc.