Grade 2 Titanium Hex Bolts and Nuts Manufacturer & Supplier
Grade 2 Titanium Hex Bolts and Nuts
Grade 2 titanium hex bolts and nuts are commercially pure titanium fasteners identified as UNS R50400. They are selected primarily for corrosion resistance, low density, ductility and reliable service in many seawater, marine, chemical-processing and industrial assemblies where the substantially higher strength of Grade 5 is not required.
SAKY ALLOY supplies hex bolts, hex cap screws, studs, threaded rod, hex nuts and washers in metric, inch-series and drawing-specific configurations. Final dimensions, mechanical properties, thread fit, surface condition, inspection and certification are confirmed against the purchase specification.
Product Specifications
| Material | Titanium Grade 2 / commercially pure titanium / UNS R50400 |
| Product types | Hex bolts, hex cap screws, fully or partially threaded bolts, studs, threaded rod, hex nuts and washers |
| Fastener standards | ASTM F468/F468M for applicable bolts and studs; ASTM F467/F467M for applicable nuts |
| Dimensional options | ISO, DIN, ASME/ANSI and customer drawings, subject to technical review |
| Typical metric range | M6 to M36 for general supply programs; smaller, larger and drawing-specific sizes by review |
| Thread options | Metric coarse/fine, UNC, UNF and drawing-specific threads |
| Surface condition | Machined, pickled, polished or project-specific finish; lubricant or coating by agreement |
| Documents | MTC, heat/lot traceability and dimensional report; additional testing by agreement |
Ranges are procurement guidance rather than a declaration of current stock. Compliance and availability are confirmed in the quotation.
Grade 2 Titanium Chemical Composition
The applicable material or fastener specification controls acceptance. The following limits are commonly used as a Grade 2 material reference; finished-product certification must follow the specification stated on the order.
| Fe max | O max | C max | N max | H max | Ti |
|---|---|---|---|---|---|
| 0.30% | 0.25% | 0.08% | 0.03% | 0.015% | Balance |
Mechanical Property Reference
Commercially pure Grade 2 titanium material is commonly specified with a minimum tensile strength near 345 MPa, minimum 0.2% yield strength near 275 MPa and minimum elongation near 20%, depending on product form, thickness and governing specification. These figures are material references, not automatic finished-fastener ratings.
Finished bolt and nut performance depends on the selected ASTM fastener specification, diameter, thread geometry, manufacturing route and test requirements. Design allowables, proof or tensile load, shear capacity, fatigue and installation preload must be established for the actual joint.
Why Specify Grade 2 Titanium Fasteners?
- Corrosion resistance: a stable passive oxide film supports service in many aerated seawater, chloride and industrial environments.
- Low weight: density is approximately 4.51 g/cm³, reducing fastener mass compared with many steel and nickel-alloy options.
- Commercially pure composition: useful where alloying additions are undesirable and Grade 2 properties satisfy the design.
- Ductility and formability: generally higher than Grade 5, although fastener production still requires controlled tooling and processing.
- Lifecycle value: corrosion-related replacement and maintenance may be reduced when the grade and joint are correctly selected.
Grade 2 vs Grade 5 Titanium Bolts
| Selection factor | Grade 2 | Grade 5 |
|---|---|---|
| Material | Commercially pure titanium, UNS R50400 | Ti-6Al-4V alloy, UNS R56400 |
| Primary reason to select | Corrosion resistance and ductility | High strength-to-weight ratio |
| Relative strength | Moderate | Substantially higher |
| Typical joint focus | Corrosion-dominated, moderate-load assemblies | Higher-load and weight-sensitive assemblies |
| Final decision | Based on load, preload, fatigue, corrosion, temperature, mating materials and applicable standards | |
Grade 2 is not a lower-quality version of Grade 5; it serves a different engineering purpose. Likewise, Grade 5 is not automatically the better choice simply because it is stronger.
Standards and Ordering Requirements
ASTM F468/F468M covers applicable commercial wrought nonferrous bolts, cap screws and studs for general use. ASTM F467/F467M addresses applicable nonferrous nuts. ISO, DIN, ASME or customer drawings may control dimensions. Confirm the current edition and whether inch-pound or metric requirements apply.
A complete order should define the Grade 2 designation, fastener and dimensional standard, diameter, pitch, length, thread tolerance, head style, mechanical requirements, finish, tests, marking and certification. Pressure, offshore or safety-critical assemblies may require additional project specifications.
Applications
- Seawater cooling, desalination and filtration equipment.
- Heat exchangers, pumps, valves and marine water-handling systems.
- Chemical-processing equipment in compatible media.
- Coastal and offshore equipment with moderate joint loads.
- Electrochemical, water-treatment and chlorination systems after material review.
- Lightweight industrial assemblies where commercially pure titanium is specified.
Grade 2 titanium is not universally resistant to every chemical. Hydrofluoric acid, dry chlorine and reducing or oxygen-depleted crevice conditions require specific engineering review. Temperature, concentration, aeration and contamination can materially change corrosion performance.
Galvanic Corrosion and Joint Design
Titanium is relatively noble in seawater. When connected electrically to a less noble metal, the mating metal may corrode faster. Designers should review material compatibility, cathode-to-anode area ratio, coatings, sealing and the possible use of nonconductive sleeves or washers.
Fastener material should be selected as part of the complete assembly rather than in isolation. The required clamp load, joint stiffness, thermal movement and access for inspection or replacement should also be considered.
Installation and Galling Control
Titanium threads can gall during tightening. Use clean, undamaged and correctly gauged threads, maintain alignment and tighten at a controlled speed. Where permitted, apply a project-approved lubricant or anti-seize compound consistently.
Lubrication changes thread friction and therefore changes the preload created by a given torque. Do not transfer a generic dry torque value to a lubricated joint without validation. See our guide on preventing galling in titanium bolts and nuts.
Inspection and Certification
- Chemical composition and raw-material mechanical-property review.
- Heat or production-lot traceability.
- Dimensional, visual and thread-gauge inspection.
- Finished-fastener mechanical tests when required by the specification.
- PMI or third-party inspection when technically appropriate and agreed.
- Export packing that preserves part identification and protects threads.
Information Required for a Quotation
- Fastener type, dimensional standard or drawing.
- Grade 2 / UNS R50400 and governing fastener specification.
- Diameter, pitch, length, thread tolerance and head style.
- Matching nut and washer requirements.
- Quantity and required mechanical properties.
- Service medium, temperature and mating materials.
- Finish, lubricant or coating restrictions.
- Inspection, certification, marking and packaging requirements.
Frequently Asked Questions
What is Grade 2 titanium?
Grade 2 is commercially pure titanium designated UNS R50400. It is widely selected for its balance of corrosion resistance, moderate strength, ductility and fabricability.
Are Grade 2 titanium bolts suitable for seawater?
They are commonly considered for many aerated seawater applications. Crevices, galvanic coupling, temperature, water chemistry and joint load must still be reviewed.
Are Grade 2 bolts as strong as Grade 5 bolts?
No. Grade 5 normally provides substantially higher strength. Grade 2 is chosen when its strength is sufficient and corrosion resistance or commercially pure composition is the main driver.
Do Grade 2 titanium threads require anti-seize?
A compatible lubricant or anti-seize is commonly considered to reduce galling. Its chemistry and the corresponding torque procedure must suit the service environment.
Can custom Grade 2 fasteners be supplied?
Custom dimensions and drawing-specific parts can be evaluated. Send the drawing, quantity, standard, required properties and inspection documents for review.
Request Grade 2 Titanium Fastener Pricing
Send the standard or drawing, size, quantity, service conditions and certification requirements. SAKY ALLOY will review manufacturability, inspection options and delivery.
Request a QuoteEngineering note: The responsible engineer must confirm joint loads, preload, fatigue, torque, corrosion compatibility and installation procedure.