Burnt Blue / PVD
Titanium Finish Bolt M6x12-35mm Modification Screws
- Grade: Gr5 Ti-6Al-4V
- Size: M6 × 12/16/20/25/30/35mm
- Coating: PVD Burnt Blue Finish
Direct Factory Catalog
Precision-Machined Titanium Socket Head & Specialty Fasteners
Manufactured in Baoji's Titanium Valley to strict DIN 912, ISO 4762, and custom OEM engineering specifications, fully inspected and packaged for heavy industrial and performance transport delivery across Palembang and South Sumatra.
Anodized CNC
GR5 Titanium Alloy M6*15 Umbrella Head Bolts
- Profile: Low-Profile Umbrella Socket
- Tensile: ≥ 895 MPa Yield
- Process: High-Speed Multi-Axis CNC
Class 8.8 / 10.9
Titanium Torx Head Star Bolt Class 8.8 Gr5
- Drive Type: Torx / Star Socket
- Surface: PVD Vacuum Coated
- Compliance: DIN 34800 / ISO Standards
High-Tensile
Titanium Wheel Lug Bolts M14x1.5 / M12x1.25
- Seat: 60° Cone / Conical Seating
- Material: Certified ASTM B348 Gr5
- Application: High-Speed Auto & EV Hubs
Custom UNC/Metric
GR5 Titanium Wheel Lug Bolts Flat Head UNC
- Weight: 44% Less than Alloy Steel
- Thread: Rolled UNC / UNF Threads
- Feature: Fatigue-Resistant Head Fillet
DIN 912 / ISO 4762
High Quality GR5 Titanium Socket Head Bolts
- Type: Hexagon Socket Head Cap Screw
- Rating: Equivalent to Class 8.8 & 10.9
- Resistance: Immune to Chloride & Salt Pitting
Stock Standard M3-M20
OEM All Sizes M3-M20 Titanium Hex Nuts
- Standard: ISO 4032 / DIN 934
- Tolerance: 6H Class Metric Thread
- Availability: Standard Sizes In Stock
Class 10.9 / 12.9
GR5 Anodized Caliper & Brake Socket Bolts
- Strength: Class 10.9 - 12.9 Stress Rating
- Finish: Electrolytic Multi-Color Anodizing
- Safety: Zero Hydrogen Embrittlement
Engineering Whitepaper: Solving Fastener Degradation in Palembang's Industrial Ecosystem
Palembang, the capital of South Sumatra, sits along the pivotal Musi River logistics corridor, anchoring critical Indonesian economic sectors including the Plaju and Sungai Gerong refining complexes, state fertilizer plants (such as PT Pupuk Sriwidjaja / PUSRI), extensive coal transport networks, and palm oil processing clusters. Operating mechanical and structural assemblies in this equatorial river-delta environment presents severe fastener integrity issues that standard carbon steel (even galvanized) and basic 304/316 stainless steels cannot reliably withstand over multi-year duty cycles.
Why Conventional 304/316 Fasteners Prematurely Crack Along the Musi River Basin
In Palembang, the combination of high ambient humidity (regularly exceeding 85%), ambient tropical temperatures (30°C–34°C), airborne sulfuric vapors near petrochemical facilities, and fluctuating chloride water runoffs triggers severe Chloride Stress Corrosion Cracking (CSCC) and pitting corrosion on common austenitic steels. Titanium Grade 5 (Ti-6Al-4V) and commercially pure Titanium Grade 2 form an instantaneous, thermodynamically stable, self-healing rutile-anatase oxide film (TiO₂) upon contact with oxygen, making them impervious to pitting, crevice erosion, and stress fracture across all ambient petrochemical operating pH ranges.
Yevzo Titanium Metal Co., Ltd. supplies high-precision Grade 5 (Ti-6Al-4V) socket head cap screws (DIN 912 / ISO 4762), countersunk socket screws (DIN 7991), and custom flange hex bolts specifically designed to counteract the exact thermal and chemical stresses found in Sumatra’s refining, marine dredging, and processing infrastructure. With a tensile yield surpassing 895 MPa and an elastic modulus of ~114 GPa, our titanium bolts cushion vibration shocks in dynamic mining conveyors and dredging pumps without micro-fracturing or seizing under thermal expansions.
Empirical Metallurgy: Titanium Gr5 vs. Stainless & High-Tensile Carbon Steel
When engineering design teams in South Sumatra evaluate socket head bolts for critical pressure flanges, marine propulsion brackets, or heavy plant installations, calculating the strength-to-weight ratio, shear performance, and galvanic potentials is critical. The engineering data below outlines the technical specifications of our Baoji mill products against conventional alloys:
| Mechanical / Physical Property | Ti-6Al-4V (Grade 5 Titanium) | Grade 2 (CP Titanium) | 316L Stainless Steel | Class 10.9 Alloy Steel |
|---|---|---|---|---|
| Ultimate Tensile Strength (UTS) | ≥ 895 – 1050 MPa | ≥ 345 – 480 MPa | 580 – 620 MPa | 1000 – 1040 MPa |
| Yield Strength (0.2% Offset) | ≥ 828 – 920 MPa | ≥ 275 MPa | 220 – 290 MPa | 900 – 940 MPa |
| Density (g/cm³) | 4.43 g/cm³ (44% lighter than steel) | 4.51 g/cm³ | 7.98 g/cm³ | 7.85 g/cm³ |
| Modulus of Elasticity (GPa) | 110 – 114 GPa (High Flex Resilience) | 103 GPa | 193 GPa | 206 GPa |
| Resistance to Chloride Pitting (PREN) | Immune across all natural waters | Immune (to 100°C) | PREN ~23–25 (Pits rapidly) | Zero (Requires heavy plating) |
| Thermal Expansion (10⁻⁶/K) | 8.6 (Closely matches alloys) | 8.6 | 16.0 (High joint displacement) | 11.5 |
*All mechanical values for titanium fasteners comply with ASTM B348, ASTM F467/F468, and DIN EN 10204 3.1 certification. Full chemical spectral analysis accompanies every outbound shipment.
Localized Engineering Applications
Where Yevzo Titanium Socket Head Bolts Serve Palembang & South Sumatra
From the industrial terminals of Boom Baru Port to the thermal extraction units across Muara Enim, our titanium socket head fasteners replace failure-prone hardware in severe service operations.
Petrochemical & Fertilizer Processing
Installed across heat exchangers, pipe flanges, acid injection headers, and metering manifolds in refinery environments like Plaju. Grade 5 titanium bolts withstand acidic vapors, ammonium nitrates, and hydrogen sulfide fumes without sulfur embrittlement.
Musi River Marine & Coal Barging
Tugboats and bulk coal barges traversing the Musi River down to the Bangka Strait utilize our DIN 912 socket head bolts for submerged thrusters, bilge impeller housings, and deck winches to stop galvanic seizing and river silt micro-abrasion.
Palm Oil Extraction & Refining
Crude Palm Oil (CPO) digestors, screw presses, and centrifugal decanters in Banyuasin and Ogan Ilir face high temperatures and corrosive free fatty acids (FFA). Titanium fasteners eliminate rust contamination from entering high-grade culinary oil lines.
Heavy Mining & Excavation Equipment
Heavy surface coal operations in Tanjung Enim use Grade 5 socket head bolts to secure sensor brackets, hydraulic manifold covers, and chassis linkages. Grade 5 provides high strength under continuous operational shock without fatigue shearing.
High-Performance Automotive & Racing
Palembang's motorsport, sports bike tuning, and light rail (LRT South Sumatra) systems leverage our titanium wheel lug bolts, brake caliper bolts, and Torx star modification screws to minimize unsprung mass and boost acceleration stability.
Wastewater Treatment & Desalination
Municipal drainage networks, chemical runoff separators, and raw Musi intake pumping systems use Gr2 and Gr5 socket fasteners to maintain reliable bolted joints in aggressive, chemically active wastewater streams.
South Sumatra Market Dynamics: The Strategic Shift Toward Titanium Fasteners
Industrial procurement across Indonesia is undergoing a major transformation. Driven by ISO 55000 asset management principles, operators across Palembang's industrial belts are evaluating the Total Cost of Ownership (TCO) over short-sighted initial purchase prices. When standard stainless or coated steel bolts fail in a continuous-stream chemical plant or on a high-throughput river barge, the cost of emergency shutdown, manual extraction of seized fasteners, and lost production can exceed the original bolt purchase cost by thousands of dollars.
Key developments driving titanium adoption across the Palembang market include:
- Downstream Industrial Value Addition (Hilirisasi): As national policies mandate more domestic refining of minerals, biofuels, and raw oil, operating temperatures and chemical concentrations in processing vessels continue to rise, demanding higher-grade alloys.
- Asset Reliability Mandates in Mining Corridors: Unscheduled stoppages in Bukit Asam coal transport systems carry significant cost penalties. Upgrading critical bolted housings to titanium eliminates downtime from vibration loosening and corrosion pitting.
- Infrastructure Life Extension: Coastal and river-facing bridges, docks, and intake tunnels in South Sumatra are extending maintenance intervals from 3 to 10+ years by specifying non-corrosive Grade 5 socket hardware on high-stress exterior joints.
Baoji Manufacturing Prowess: Why Global Engineers Trust Yevzo
Established in 2013 in the Honeycomb Industrial Park within Baoji’s High-Tech Development Zone, Yevzo Titanium Metal Co., Ltd. sits directly inside China's primary titanium sponge and smelting center. Being integrated into this metallurgical hub gives our manufacturing facilities distinct technical and commercial advantages:
Mill-Direct Sponge & Bar Stock
We source vacuum-arc remelted (VAR) ASTM B348 Grade 5 titanium bars with verified grain homogeneity. Every production run has clear heat-lot tracking from ingots to final threading.
Precision CNC & Thread Rolling
Unlike budget fasteners made with cut threads, Yevzo cold-rolls and CNC-machines threads to 6g/6H tolerances. Cold rolling prevents micro-notching and increases dynamic fatigue resistance by over 30%.
Certified 100% Quality Assurance
Every shipment passes optical comparator profiling, automated thread pitch inspection, Vickers/Rockwell hardness validation, and dye-penetrant testing for zero micro-fissures.
Whether Palembang distributors require standard DIN 912 socket screws in M3 through M24, or need specialized custom fasteners machined from 2D/3D CAD models (STEP/DWG), our in-house engineering team delivers rapid turnaround times backed by extensive OEM/ODM production experience.
Procurement Knowledge Base
Frequently Asked Questions for Palembang Fastener Buyers
Clear, practical guidance addressing common questions on logistics, metallurgy, anti-galling assembly, and trade terms for South Sumatra operations.
How can we prevent thread galling when installing titanium socket head bolts?
Titanium has a natural tendency to cold-weld or "gall" when subjected to friction under tight mating clearances without lubrication. For Palembang installations, we recommend:
1. Always apply a high-quality nickel-, copper-, or molybdenum disulfide-based anti-seize paste before torquing.
2. Avoid high-RPM pneumatic impact drivers during final engagement; hand-torque smoothly using calibrated torque wrenches.
3. When assembling titanium bolts into aluminum housings in humid marine environments, use non-conductive ceramic paste or PTFE washers to prevent galvanic coupling.
1. Always apply a high-quality nickel-, copper-, or molybdenum disulfide-based anti-seize paste before torquing.
2. Avoid high-RPM pneumatic impact drivers during final engagement; hand-torque smoothly using calibrated torque wrenches.
3. When assembling titanium bolts into aluminum housings in humid marine environments, use non-conductive ceramic paste or PTFE washers to prevent galvanic coupling.
What are the shipping routes, customs clearance options, and transit times to Palembang?
We provide comprehensive international shipping terms (Incoterms: FOB, CIF, CFR, DDP, and Express):
Express Air Cargo (DHL / FedEx / UPS): 4 to 7 business days directly to your facility in Palembang or Sultan Mahmud Badaruddin II International Airport (ideal for urgent maintenance stock).
Ocean Freight: Shipped from Shanghai or Qingdao to Port of Tanjung Priok (Jakarta) or direct feeder discharge at Boom Baru Port (Palembang) within 16 to 24 days, complete with Mill Test Certificates, commercial invoices, and Indonesian import documentation.
Express Air Cargo (DHL / FedEx / UPS): 4 to 7 business days directly to your facility in Palembang or Sultan Mahmud Badaruddin II International Airport (ideal for urgent maintenance stock).
Ocean Freight: Shipped from Shanghai or Qingdao to Port of Tanjung Priok (Jakarta) or direct feeder discharge at Boom Baru Port (Palembang) within 16 to 24 days, complete with Mill Test Certificates, commercial invoices, and Indonesian import documentation.
What is the functional difference between Grade 2 and Grade 5 titanium bolts in plant usage?
Grade 2 (Commercially Pure): Offers an ultimate tensile strength of ~345–480 MPa. It is highly ductile, easier to form, and chemically inert, making it ideal for non-structural chemical conduits, plating racks, and wastewater channels.
Grade 5 (Ti-6Al-4V): An alpha-beta alloy heat-treated to achieve over 895–1050 MPa tensile strength, exceeding Class 8.8 steel. It is the mandatory choice for structural flanges, rotating assemblies, vehicle drivetrains, and pressure vessels where load capacity is critical.
Grade 5 (Ti-6Al-4V): An alpha-beta alloy heat-treated to achieve over 895–1050 MPa tensile strength, exceeding Class 8.8 steel. It is the mandatory choice for structural flanges, rotating assemblies, vehicle drivetrains, and pressure vessels where load capacity is critical.
Can Yevzo manufacture custom socket head bolts based on our specific CAD drawings?
Yes. Beyond standard DIN 912, DIN 7991, and ISO standards, our Baoji facility operates 3-axis, 4-axis, and 5-axis CNC turning and milling centers. Send us your technical drawings (.PDF, .STEP, .IGS, or .DWG) specifying thread pitch, shank length, shoulder steps, drive style (Torx, Hex, Spline), and finish. We can provide a comprehensive engineering quote and sample review within 24 hours.
What surface finishes and anodized coatings are available, and do they affect thread fit?
We provide plain machined, micro-polished, physical vapor deposition (PVD), and electrolytic anodized finishes (including gold, cobalt blue, purple, burnt rainbow, and matte black). Because titanium anodizing produces a microscopic, controlled oxide layer rather than a thick mechanical plating, it creates zero dimensional buildup, ensuring that 6g/6H thread fit tolerances remain precise and true.
What are your Minimum Order Quantities (MOQ) and accepted payment terms?
For standard catalogue inventory (M3 through M20 socket screws and nuts), our MOQ begins at just 10 to 30 pieces to facilitate engineering evaluations and prototyping. For custom CNC components, MOQs depend on stock bar diameters and machining times. We accept T/T, L/C at sight, PayPal, Western Union, and Escrow, handling transactions in USD, EUR, and other major currencies.
Ready to Upgrade Your Fastener Reliability in Palembang?
Connect directly with our engineering metallurgists and international export specialists in Baoji. Send us your required sizes, thread specifications, target quantities, or CAD drawings to receive a responsive, factory-direct quotation within one business day.