Tantalum Hex Cap Screws

Brand RAYCHIN

Product origin CHINA

Delivery time 5-35 DAYS

Tantalum hex head cap screws are best known for its unmatched corrosion resistance and chemical inertness. Tantalum screws have a similar corrosion resistance to that of glass, but all of the typical mechanical and electrical properties of a metal.

Tantalum screws 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 hex head cap screws 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 hex head cap screws are available in commercially pure tantalum and tantalum 2.5% tungsten (Ta-2.5%W).

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Tantalum Hex Cap Screws

Tantalum Hex Head Cap Screws

Tantalum screws 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 hex head cap screws 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 hex head cap screws are available in commercially pure tantalum and tantalum 2.5% tungsten (Ta-2.5%W).

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 hex head cap screw features and benefits
Tantalum grades, specifications and chemistry
Datasheet for tantalum

Resources: Tantalum Torque Spec

Screw Types: Button Head Cap Screws, Flat Head Screws, Hex Cap Screws, Pan Head Screws, Set Screws, Socket Head Cap Screws, Tamper Resistant Security Screws,

Tantalum Hex Head Cap Screw Features and Benefits

It is important to differentiate between a tantalum hex head cap screw and hex head bolt. Often people assume they are the same, but they are actually very different fasteners in terms of how they are manufactured, as well as from an application perspective. Regardless of your choice, tantalum hex heads offer strong, stable joints because of their large head service.

The Hex Comparison

Hex Head Cap Screw	Hex Head Bolts
Precise applications where tight tolerances on the body dimensions are required. Features flat washer facing under the bolt head. Also called a finished hex bolt.	Appropriate for when mechanical properties are more important than dimensional tolerances. Hex bolts have a flat end and lack the washer face under the head.

Tantalum Hex Head Cap Screw Advantages

The most important feature of a tantalum hex head cap screws is that it has a larger bearing surface area which provide better clamping pressure than other type of fastener such as a socket head cap screw. Additionally, since debris build up is less of an issue with this style of fastener verses a socket head cap screw, they are ideal of dirty applications where particles could clog up a socket. Though tantalum socket heads are typically used for tight access applications, hex heads can be a better choice when there is only side clearance available for tightening.

Tantalum Grades, Specifications and Chemistry

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 (CP)	Ta	Nb	W	Mo	O	Ti	Ni	Fe	N	C	Si	H
Max%	>99.95	0.100	0.050	0.020	0.015	0.010	0.010	0.010	0.010	0.010	0.010	0.010

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.

Specifications: UNS R05252

Tantalum 2.5%W	Ta	W	Nb	Mo	O	Ti	Ni	Fe	N	C	Si	H
Typical%	Bal	2.5	0.50	0.020	0.015	0.010	0.010	0.010	0.010	0.010	0.005	0.002

Physical Properties

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 Tensile Data

TANTALUM - Tensile Data

Temperature (°F)	Ultimate Tensile (ksi)	Yield Strength at 0.2% Offset (ksi)	Elongation %
Room Temp.	40.0	25.0	50.0
200	29.0	22.0
400	28.0	12.0
600	28.0	8.0
800	27.0	2.5

TANTALUM 2.5% W - Tensile Data

Temperature (°F)	Ultimate Tensile (ksi)	Yield Strength at 0.2% Offset (ksi)	Elongation %
Room Temp.	50.0	35.0	25.0
200	48.0	30.0	15.0
400	42.0	27.4	10.0
485	40.0	25.5	10.0

Tantalum Iso-Corrosion Curves

Tantalum Hex Cap Screws

Tantalum Corrosion Resistance Table

TANTALUM SHOWS A NIL CORROSION RATE TO THE FOLLOWING MEDIA For all temperatures up to at least 302F (150C) unless otherwise indicated
Acetic acid Acetic anhydride Acetone Air,<300°C (570°F) Alcohols Aldehydes Aluminum chloride Aluminum nitrate Aluminum sulfate Amines Ammonium bicarbonate Ammonium carbonate Ammonium chloride Ammonium nitrate Ammonium acid phosphate Ammonium phosphate Ammonium sulfate Amyl acetate or chloride Aniline hydrochloride Aqua regia Barium carbonate Barium chloride Barium hydroxide Barium nitrate Benzoic acid Body fluids Boric acid Bromine, dry, <300°C (570°F) Bromine, wet Butyric acid Calcium bicarbonate Calcium bisulfates Calcium bisulfites Calcium carbonate Calcium chloride Calcium hydroxide Calcium hypochlorite Carbolic acid Carbon dioxide Chloric acid Chlorinated brine	Chlorine, dry, <250°C (480°F) Chlorine, wet, <350°C (662°F) Chlorine oxides Chloroacetic acid Chromic acid Chrome plating solutions Citric acid Cleaning solutions Copper salts Dichloroacetic acid Dimethylformaldehyde Ethylene dibromideEthyl sulfate Fatty acids Ferric chloride Ferric sulfate Ferrous sulfate Food stuffs Formaldehyde Formic acid Fruits Glycerine Graphite, <1000°C Hydroiodic acid Hydrobromic acid Hydrocarbons Hydrochloric acid Hydrogen bromide, <400°C Hydrogen chloride, <350°C Hydrogen iodide Hydrogen peroxide Hydrogen sulfide Hydroxyacetic acid Hypochlorus acid Iodine, <300°C (570°F) Ketones Lactic acid Lead salts Magnesium chloride Magnesium hydroxide Magnesium sulfate	Maleic acid Manganous chloride Methyl alcohol Methylsulfuric acid Milk Mineral oils Mixed acids (sulfuric-nitric) Motor fuels Nickel salts Nitric acid Nitric acid, fuming Nitric oxides Nitrogen, <300°C (570°F) Nitrous acid Nitrosyl chloride Organic chlorides Organic acids Organic esters Organic salts Oxalic acid Oxygen, <300°C (570°F) Pechloric acid Petroleum products Phenol Phosphoric acid, <4ppmF,<180°C Phosphorus, <700°C (1290°F) Phosphorus chlorides Phosphorus oxychloride Phthalic anhydride Pickling acids, except HNO3-HF Potassium bromide Potassium chloride Potassium dichromate Potassium ferricyanide Potassium iodine-iodine Potassium nitrate Potassium permanganate	Potassium sulfate Potassium thiosulfate Propionic acid Refrigerants Sea water Silver nitrate Sodium acetate Sodium aluminate Sodium bisulfate, solution Sodium bromide Sodium chlorate Sodium chloride Sodium citrate Sodium cyanide Sodium dichromate Sodium hypochlorite Sodium nitrate Sodium nitrite Sodium phosphate Sodium silicate Sodium sulfate Sodium sulfide Sodium sulfite Sodium thiosulfate Stearic acid Succinic acid Sugar Sulfamic acid Sulfur, <500°C (930°F) Sulfur chlorides Sulfur dioxide Sulfuric acid, to 175°C (350°F) Sulfurous acid Sulfuryl chloride Tannic acid Tartaric acid Thoinyl chloride Tin salts Zinc chloride Zinc sulphate
TANTALUM SHOWS LIMITED CORROSION RESISTANCE TO THE FOLLOWING MEDIA
Air,>300°C (570°F) Ammonia Ammonium hydroxide Fluoride salt Hydrofluoric acid	Hydrogen, >300°C (570°F)Hydrogen fluoride Oleum (fuming sulfuric acid) Potassium carbonate Potassium hydroxide, dilute	Potassium hydroxide, conc. Potassium pyrosulfate, molten Sodium bisulfate, molten Sodium carbonate Sodium hydroxide, dilute	Sodium hydroxide, conc. Sodium pyrosulfate, molten Sulfur trioxide Sulfuric acid, >175°C (350°F)