COMPREHENSIVE TECHNICAL ANALYSIS AND DATASHEET OF ALUMINIUM 1100 FASTENERS
Aluminium 1100 (UNS A91100) is the most widely utilized grade of commercially pure aluminium, boasting a minimum purity level of 99.00%. Because it lacks the heavy alloying elements found in aerospace or structural aluminium grades, it retains the absolute maximum properties of the raw element: extreme ductility, exceptional atmospheric and chemical corrosion resistance, and brilliant thermal and electrical conductivity.
As a strictly non-heat-treatable alloy, Aluminium 1100 relies entirely on the strain-hardening (cold-working) achieved during the fastener manufacturing process to gain mechanical strength. While its tensile yield is relatively low compared to structural alloys like 6061 or 7075, its unparalleled workability makes it the premier choice for complex cold-headed solid rivets, lightweight architectural flashing screws, and highly conductive electrical binding hardware where failure through cracking or chemical attack is not an option.
■ Product Overview & Specifications
| Material Classification | Commercially Pure Aluminium (Non-Heat Treatable) |
|---|---|
| UNS Designation | A91100 |
| Microstructure | Single-Phase Face-Centered Cubic (FCC) |
| Magnetic State | Completely Non-Magnetic |
| Density | 2.71 g/cm³ (0.098 lb/in³) — Exceptionally Lightweight |
| Size Range | Metric: M2 to M24 | Imperial: #2 to 1" |
| Primary Attribute | Maximum Formability & Ultimate Corrosion Resistance |
■ Proprietary Datasheet Download (GATED)
Aluminium 1100 Alloy — Complete Technical Datasheet
Contains detailed cold-heading upset limits for solid rivet designs, thermal expansion and conductivity profiles for heat-exchanger assemblies, and comprehensive galvanic isolation guides.
⬇ DOWNLOAD DATASHEET■ MTC Integration Section
When utilizing 1100 series fasteners for chemical containment or food-grade processing, certifying the 99.00% minimum purity is a strict regulatory requirement. Ananka provides total supply-chain transparency back to the primary aluminium smelting facility.
- EN 10204 Type 3.1: Validates the mandatory 99.00% minimum Aluminium content, verifies the strict limitations on trace Iron and Silicon, and confirms the specific strain-hardened temper (e.g., H14 or H18) of the finished fastener.
- EN 10204 Type 3.2: Available upon request for highly regulated chemical transport vessels, specialized cryogenic hardware, or aerospace grounding applications requiring third-party testing oversight.
■ Chemical Composition
The beauty of the 1100 alloy lies in its simplicity. With a guaranteed minimum of 99.00% Aluminium, the only permitted variations are microscopic amounts of Copper (to slightly refine grain structure during drawing) and trace limits on Iron and Silicon. This lack of heavy alloying metals prevents the formation of galvanic micro-cells within the metal, giving it superior rust-proof characteristics.
| Aluminium (Al) | Copper (Cu) | Iron (Fe) + Silicon (Si) | Manganese (Mn) | Zinc (Zn) |
|---|---|---|---|---|
| 99.00 Min | 0.05 – 0.20 | 0.95 Max | 0.05 Max | 0.10 Max |
■ Mechanical Properties
| Mechanical Property | Typical Limits (H14 to H18 Cold-Worked Temper) |
|---|---|
| Tensile Strength | 16,000 - 24,000 psi (110 - 165 MPa) |
| Yield Strength | 14,000 - 22,000 psi (95 - 150 MPa) |
| Electrical Conductivity | ~ 59% IACS |
| Hardness (Brinell) | 32 - 44 HB |
■ Equivalent Grades & Designations
| Standard / System | Designation |
|---|---|
| ASTM Specifications | ASTM B211 (Bar, Rod, Wire), ASTM F468 (Fasteners) |
| Common Trade Names | 1100 Aluminium, Commercially Pure Aluminium, CP Al |
| European Equivalent | EN AW-1100 / Al99.0Cu (DIN 3.0205) |
| British Standard (BS) | 1C |
■ Applications & Industries
- Chemical & Food Processing: Custom solid rivets, binding screws, and sheet metal fasteners for brewing vats, dairy processing equipment, and chemical holding tanks where toxicity must be strictly zero.
- Electrical & Thermal Infrastructure: Non-magnetic grounding screws, terminal connections, and heat-exchanger radiator fins where high thermal and electrical conductivity (~59% IACS) is paramount.
- Architectural & Sheet Metal: Spun hollowware hardware, lightweight aesthetic architectural panelling fasteners, and severe-weather outdoor flashing requiring ultimate atmospheric corrosion resistance.
■ Compatible Fastener Assemblies
| Mating Bolts/Machine Screws | Internal Threads (Nuts) | Washers |
|---|---|---|
| Aluminium 1100 Screws & Solid Rivets | Aluminium 1100 Hex Nuts | Aluminium 1100 Flat Washers |
■ Torque & Installation Guidelines
CRITICAL WARNING: Aluminium 1100 is an incredibly soft metal. Applying standard torque values used for steel or even structured aluminium (like 6061-T6) will result in immediate thread shearing, elongation, and joint failure. Assembly must be strictly handled with calibrated low-torque drivers, and over-tightening must be avoided.
| Nominal Diameter | Threads Per Inch (UNC) | Max Target Torque (in-lbs) | Max Target Torque (ft-lbs) |
|---|---|---|---|
| #8 | 32 | 6 - 8 | ~ 0.5 |
| #10 | 24 | 10 - 14 | ~ 1.0 |
| 1/4" | 20 | 25 - 30 | ~ 2.2 |
| 3/8" | 16 | 70 - 80 | ~ 6.0 |
■ Frequently Asked Questions
1. Why use Aluminium 1100 instead of a stronger structural grade like 6061 or 7075?
Alloys like 6061 and 7075 contain significant amounts of Magnesium, Silicon, and Zinc to increase their tensile strength. However, adding these alloys severely degrades the metal's electrical conductivity and drastically reduces its resistance to chemical corrosion. If a fastener is not bearing heavy structural loads, but instead needs to act as an electrical conductor or survive inside a highly corrosive chemical vat, pure 1100 Aluminium is far superior to structural grades.
2. Can 1100 Aluminium fasteners be heat-treated to increase their strength?
No. Aluminium 1100 is fundamentally a "non-heat-treatable" alloy because it lacks the necessary elements (like Magnesium or Silicon) to form hardening precipitates during thermal baking. The only way 1100 series fasteners gain mechanical strength is through "strain hardening"—the physical force applied to the metal when it is cold-headed or thread-rolled at the factory.
3. Do I need to worry about galvanic corrosion with Aluminium 1100?
Yes, significantly. Aluminium is a highly active (anodic) metal. If you use an Aluminium 1100 fastener to secure a piece of Stainless Steel, Copper, or Brass, and moisture (an electrolyte) is introduced, the aluminium will act as a sacrificial anode and rapidly corrode away. You must use specialized dialectric isolation washers (nylon, PTFE) if mating aluminium to dissimilar metals.