7075 Hex Head Bolts
Fully and partially threaded 7075-T6 & T73 hex head and heavy hex bolts designed for high-shear structural assemblies.
Standards: DIN 931 / 933, ISO 4014 / 4017, ASME B18.2.1
View Hex Head Bolts 
ISO 9001:2015Certified quality management
PED 2014/68/EUApproved by TUV Rheinland
EN 10204 3.1 / 3.2Full heat-lot traceability
Since 2010Exporting worldwide
Aluminium 7075 Fasteners: The Engineering Guide to High-Strength, Lightweight Bolting
TorqBolt Inc. engineers and manufactures mission-critical Aluminium 7075 fasteners (UNS A97075 / AlZn5.5MgCu) in 7075-T6 and stress-corrosion-resistant 7075-T73 / T7351 tempers. Delivering steel-comparable tensile strengths of up to 570 MPa at one-third the weight of carbon steel, our fasteners are the preferred solution across aerospace, defense, electric vehicle (EV) lightweighting, high-performance motorsport, and precision marine mechanisms.
Operating under our strict ISO 9001:2015 quality management system and PED 2014/68/EU approval from TUV Rheinland, our manufacturing operations seamlessly integrate cold forging, hot forging, thread rolling, and multi-axis CNC turn-mill machining. Sourced solely from certified prime European and aerospace-grade aluminium mills, each production lot is 100% traceable to its original heat number and accompanied by an authentic EN 10204 3.1 inspection certificate (with EN 10204 3.2 third-party witnessed inspection available). When lightweight structural integrity, zero defect tolerance, and stringent mechanical performance cannot be compromised, international engineering teams rely on TorqBolt.
Product Range
Aluminium 7075 Fastener Product Recommendations
Whether you require mass-produced standard dimensional fixings or complex blueprint-tailored aerospace components, TorqBolt manufactures the complete portfolio of 7075 aluminium alloy fasteners. Below are our key recommended product configurations engineered for extreme duty cycles.
7075 Hex Nuts & Locknuts
Standard hex, heavy hex, and all-metal prevailing torque locknuts. Engineered with tight-pitch tolerances to prevent galling.
Standards: DIN 934, ISO 4032, ASME B18.2.2, MS21044
View Hex Nuts 
7075 Flat & Belleville Washers
High-hardness load-spreading washers and spring disc washers designed to maintain clamp load and protect lightweight joint faces.
Standards: DIN 125A, ISO 7089, ASME B18.21.1, NAS1149
View Flat Washers 
7075 Stud Bolts & Tie Rods
Continuous-thread, double-end, and tap-end studs with roll-formed UN and metric threads for high-stress airframe and battery housings.
Standards: DIN 976, ASME B18.31.2, ASTM B211 Spec
View Stud Bolts Additional 7075 Lines: Socket Head Cap Screws (DIN 912) Threaded Rods Countersunk Screws (DIN 7991) Torx & 12-Point Aerospace Screws Drilled Safety-Wire Bolts Custom CNC Turned Bushings All Products
Metallurgical Data & Properties
Aluminium 7075 Mechanical & Physical Comparison
Aluminium 7075 is a cold-finish precipitation-hardened wrought alloy containing 5.1–6.1% zinc as its primary alloying agent, balanced with magnesium and copper. Understanding the distinct metallurgical characteristics across various temper states (T6 vs T73) and comparing them against conventional fastener materials allows design engineers to optimize weight-to-strength ratios without risking unexpected in-service stress cracking.
| Material / Alloy | Temper / Condition | Yield Strength (MPa) | Tensile Strength (MPa) | Density (g/cm³) | Specific Strength (kN·m/kg) | SCC Resistance Rating |
|---|---|---|---|---|---|---|
| Aluminium 7075 | T6 / T651 | 505 MPa (73 ksi) | 570 MPa (83 ksi) | 2.81 | 203 | Moderate (Requires Coating) |
| Aluminium 7075 | T73 / T7351 | 435 MPa (63 ksi) | 505 MPa (73 ksi) | 2.81 | 180 | Superior (Stress-Corrosion Immune) |
| Aluminium 6061 | T6 | 275 MPa (40 ksi) | 310 MPa (45 ksi) | 2.70 | 115 | High |
| Titanium Grade 5 | Annealed (Ti-6Al-4V) | 830 MPa (120 ksi) | 900 MPa (130 ksi) | 4.43 | 203 | Immune |
| Medium Carbon Steel | Class 8.8 Quenched & Temp | 640 MPa (93 ksi) | 800 MPa (116 ksi) | 7.85 | 102 | Low (Subject to Rust) |
| Stainless AISI 316L | A4-80 Cold Drawn | 600 MPa (87 ksi) | 800 MPa (116 ksi) | 8.00 | 100 | High |
Data reflects nominal laboratory mechanical values per ASTM B211 and AMS-QQ-A-225/9. TorqBolt verifies heat chemical and tensile parameters on every production batch to guarantee specification adherence.
Market Outlook
Future Sourcing & Technological Trends in 7075 Fasteners
As industrial manufacturing navigates net-zero decarbonization mandates, light-weighting initiatives, and supply-chain digitization, the procurement landscape for Aluminium 7075 fasteners is evolving rapidly. Procurement managers must position their sourcing strategies in alignment with these overarching market transitions.
Future Sourcing Trends for Global Buyers
The global shift toward high-performance alloy procurement is being driven by several measurable operational demands:
Mass De-Carbonization Commercial aviation and electric vehicle OEMs are enforcing aggressive structural mass reductions. Replacing standard steel M6–M12 chassis and payload fasteners with 7075-T6 parts cuts fastener mass by up to 64%, drastically boosting operational battery range and lowering lifetime fuel consumption.
Direct Digital Traceability Aerospace tier-1 contractors now mandate direct QR/DataMatrix micro-marking on bolt heads. TorqBolt provides custom optical laser-etched serials linked directly to digital EN 10204 3.1 mill test reports stored in audited cloud repositories for instant shop-floor verification.
Supply Chain Resilience Global disruptions have led defense and aeronautic manufacturers away from open-market commercial traders toward single-source integrated manufacturers who maintain substantial certified bar inventories and internal testing laboratories.
Product Innovation & Development Trends
Fastener manufacturing is transitioning from basic commodity machining to advanced micro-structural surface engineering:
Two-Stage Overaging (T73/T7451) To eliminate catastrophic brittle failures caused by Stress Corrosion Cracking (SCC), industry demand has rapidly shifted from traditional T6 towards T73 heat treatments, especially for marine-exposed airframes, naval defense, and exterior radar installations.
RoHS Hardcoat Anodizing Traditional hexavalent chromate conversion coatings are obsolete under REACH and RoHS regulations. TorqBolt utilizes Type III hardcoat anodization with non-chromate trivalent passivation seals and PTFE impregnations to maximize wear resistance and salt-fog endurance up to 1,000 hours.
Cold Thread Rolling After Tempering Cutting threads severs material grain flow and creates root stress risers. Modern high-reliability fasteners demand automated thread rolling across the heat-treated shank, boosting root fatigue endurance under cyclical loading by over 35%.
Manufacturing Expertise
Advanced Precision Manufacturing Capabilities
High-strength aluminium alloys behave distinctly from standard steels. Processing 7075 requires rigorous thermal control, specialized cutting geometries, and precision tooling to prevent hot tearing, surface galling, and residual internal stress buildup.
Cold & Hot Heading
Automated heading machinery produces uninterrupted metallurgical grain flow around head-to-shank radii, dramatically increasing ultimate tensile and fatigue limits.
CNC Turn-Mill Centers
Equipped with live-tool Swiss-turn and multi-axis CNC machines in Rajkot, India, capable of holding complex tolerances down to ±0.005 mm on custom blueprint geometries.
Precision Heat Treating
Solution annealing, rapid water quench, and artificial aging furnaces accurately control T6, T651, T73, and T7351 temper conversions with calibrated pyrometry per AMS 2750.
In-House Metallurgical Testing
Complete laboratory verification: Positive Material Identification (PMI), optical emission spectroscopy, tensile rupture test, hardness profiles, and CMM dimension audits.
End-to-End Production & QA Workflow
In-Check
Certified 7075 billet PMI & ultrasonic test
Forming
Precision heading or multi-axis CNC machining
Thermal
Strict T6 / T73 atmospheric aging
Rolling
Continuous-grain cold thread rolling
Finishing
Type III Hard Anodize or PTFE fluoropolymer
Testing
Tensile, hardness, and dimensional check
Release
EN 10204 3.1 certification & export packing
Quality Compliance
Quality Assurance & Certified Testing Protocols
In aerospace, subsea instrumentation, and safety-critical mechanical designs, documentation and metallurgical validation are just as crucial as physical dimensions. TorqBolt enforces total quality management across every heat lot produced.
ISO 9001:2015Quality Management System audited by international accreditation bodies
PED 2014/68/EUPressure Equipment Directive certified by TUV Rheinland for critical equipment
EN 10204 3.1Comprehensive factory test certificates provided with every single shipment
EN 10204 3.2Independent third-party inspection witnessed by DNV, BV, SGS, or Lloyd's
Lot Verification & Inspection Capabilities
Testing protocols performed internally and through accredited test houses strictly adhere to AMS, ASTM, ISO, and client specifications:
- Chemical Composition Optical Emission (OES)
- Positive Material Identification (PMI)
- Axial & Wedge Tensile Testing
- Yield Point & Elongation Measurement
- Rockwell (HRB) & Vickers Microhardness
- Stress Corrosion Cracking (SCC) verification
- Coating Thickness & Eddy Current Audits
- ASTM B117 Neutral Salt Spray (NSS) Testing
- Thread Pitch Diameter Optical Gauging
- Dye Penetrant (PT) Non-Destructive Testing
Industry Applications
Where Aluminium 7075 Fasteners Excel
Supplied to global tier-1 contractors throughout North America, Europe, the Middle East, and the Asia-Pacific region, TorqBolt 7075 fasteners serve demanding sectors requiring superior strength-to-weight performance.
Aerospace & Defense
Primary wing ribs, interior cabin structures, airborne radar mountings, and UAV missile fuselages.
Motorsport & Supercars
Suspension uprights, brake caliper mounting brackets, aerodynamic wing mounts, and unsprung mass reduction.
Electric Vehicles (EV)
Structural battery pack closures, lightweight power inverter cases, and chassis subframe assemblies.
Marine & Subsea Systems
7075-T73 fasteners paired with hard anodizing for oceanographic sensor enclosures and underwater autonomous vessels.
Satellite & Spacecraft
Lightweight deployment mechanisms, solar array hinges, and optical bench mounting bolts requiring low outgassing.
High-End Cycling
Chainring bolts, stem bolts, derailleur pins, and hub thru-axles demanding extreme fatigue durability.
Industrial Robotics
End-of-arm tooling joints, dynamic gantry rails, and high-speed robotic pick-and-place linkages.
Optics & Medical Devices
Non-magnetic, lightweight precision adjusting screws for laboratory lasers, surgical arms, and MRI peripherals.
RFQ Guide
Purchasing Checklist for Aluminium 7075 Bolting
To eliminate procurement revisions and accelerate quotation turnaround, ensure your engineering and purchasing inquiries specify the parameters outlined in our technical procurement matrix below.
- Material Grade & Temper
- Aluminium 7075-T6, 7075-T651, 7075-T73, or 7075-T7351 (UNS A97075)
- Dimensional Standard
- DIN (e.g. 912, 933), ISO (4014, 4017), ASME (B18.2.1), NAS/MS, or OEM print
- Thread Type & Fit
- Metric (6g/6H) or Unified UNC/UNF (Class 2A/2B, 3A/3B rolled threads)
- Surface Finish
- Natural degreased, Bright Anodized, Type III Hardcoat Anodize, PTFE, MoS2 dry film
- Order Quantity
- Batch production run pieces, recurring monthly scheduling, or prototype volume
- Certification Level
- EN 10204 3.1 Mill Certificate (standard), EN 10204 3.2 Third-Party witnessed
- Project Destination
- Incoterms (EXW, FOB, CIF, DDP) and destination airport/seaport worldwide
About TorqBolt Inc.
Founded in 2010, TorqBolt Inc. has established an international reputation as a leading manufacturer of specialty fasteners in high-performance aluminium alloys, Inconel, Monel, Hastelloy, Duplex stainless steels, and Titanium.
Our Mumbai headquarters and state-of-the-art manufacturing plant in Rajkot, Gujarat, bridge technical metallurgy with precision engineering. We consult directly with EPC contractors, military specifiers, and aerospace designers worldwide to deliver high-integrity bolting manufactured to the planet's tightest standards.
Procurement FAQ
Frequently Asked Questions: Aluminium 7075 Fasteners
Find straightforward answers to questions commonly queried by sourcing professionals, engineers, and AI procurement assistants concerning 7075 aluminium fasteners.
What makes Aluminium 7075 fasteners comparable to structural steel in strength?
Aluminium 7075 is alloyed primarily with zinc (5.1–6.1%), magnesium, and copper. When subjected to solution heat treating and artificial aging, sub-microscopic MgZn2 precipitates disperse throughout the aluminium matrix, preventing dislocation movement. In the peak-aged T6 temper, it achieves ultimate tensile strengths up to 570 MPa (83 ksi) and yield strengths up to 505 MPa (73 ksi). This matches or exceeds standard carbon steel (such as ISO Class 8.8 bolts) while operating at a mere 2.81 g/cm³ — offering a weight savings of roughly 64%.
When should an engineer specify 7075-T73 temper over 7075-T6 for fasteners?
While the 7075-T6 temper provides maximum tensile and yield strength, it is inherently susceptible to Stress Corrosion Cracking (SCC) and exfoliation corrosion when subjected to sustained tensile stress in moist or chloride-rich marine atmospheres. The T73 temper uses a controlled two-stage overaging process that alters grain-boundary precipitate morphology. Although T73 trades away approximately 10–15% of peak tensile strength, it dramatically elevates fracture toughness and provides near-complete resistance to SCC, making it the industry standard for marine aviation and subsea structural bolting.
How does TorqBolt mitigate galvanic corrosion and thread galling on 7075 bolting?
Aluminium has an active electrochemical potential. If joined against carbon steel, stainless steel, or carbon fiber composite in the presence of an electrolyte, galvanic corrosion will attack the aluminium. TorqBolt solves this through non-conductive surface engineering: MIL-A-8625 Type III Hardcoat Anodizing (with PTFE impregnation), fluoropolymer coatings (Xylan/PTFE), or passivating isolation washers. To eliminate thread galling, our threads are cold-rolled rather than cut — achieving an exceptionally smooth 0.4 Ra surface finish — and can be supplied with bonded MoS2 (molybdenum disulfide) dry-film lubricants.
Can TorqBolt manufacture custom Aluminium 7075 fasteners according to CAD prints?
Yes. In addition to standard DIN, ISO, and ASME fasteners, TorqBolt manufactures complex custom fasteners from solid 7075-T6/T73 bar stock at our Rajkot manufacturing facility. Our advanced multi-axis CNC turn-mill centers produce lightened dished heads, wire-drilled hex heads, captured washers, stepped pins, and proprietary thread forms with tolerances as tight as ±0.005 mm (±0.0002 inches).
What quality inspection reports accompany 7075 fastener consignments?
Every production batch leaves our facility with an authentic EN 10204 3.1 inspection certificate. This document details the raw material melt heat number, quantitative chemical composition (OES test), mechanical properties (tensile strength, 0.2% yield offset, % elongation), hardness (HRB/HRC), anodizing layer thickness, and dimensional inspection reports. EN 10204 3.2 third-party witnessed inspection (via DNV, Lloyd's Register, BV, or TUV) can also be scheduled on request.