UNS C54400 Phosphor Bronze Fasteners
UNS C54400 Phosphor Bronze Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for UNS C54400 (Free-Cutting Phosphor Bronze B2) fasteners. Review the documentation verifying its complex Lead, Tin, and Zinc alloying, which guarantees outstanding machinability alongside extreme wear resistance.
What's Inside This C54400 Phosphor Bronze MTC
This sample mill test certificate details the critical chemical and mechanical parameters required for UNS C54400 fasteners. Often referred to as "Bearing Bronze" or "Free-Cutting Phosphor Bronze," this alloy combines the fatigue and wear resistance of standard phosphor bronze with an incredible 80% machinability rating.
- Full Traceability: Certified with TC No.: S294/26-XX and fully mapped to ASTM F468 and ASTM B139 specifications for nonferrous machined bolting.
- Leaded Chemistry: Explicitly verifies the deliberate addition of 3.5 - 4.5% Lead (Pb). This acts as an internal lubricant during both CNC turning operations (reducing tool wear) and long-term mechanical friction in service.
- Tin & Zinc Alloying: Confirms the presence of roughly 4% Tin (Sn) for strength and corrosion resistance, combined with Zinc (Zn) to improve casting soundness and mechanical properties.
- Deoxidized Structure: The critical 0.01 - 0.50% Phosphorus addition ensures the metal is thoroughly deoxidized, creating a dense, fine-grained structure highly resistant to metal fatigue.
- Quality Compliance: 100% visual inspection and precision dimensional checks executed to ASME B18.2.1 standards. Confirmed completely non-magnetic.
Live Preview: UNS C54400 Phosphor Bronze MTC Data
Review the specific chemical limits emphasizing the Lead and Tin content before downloading.
TC Number
S294/26-XX
TC Date
12.06.20XX
Material Spec
ASTM F468 / B139 UNS C54400
Bar Shape / Size
Hexagon Bar / 12 mm
Dimensions / Item
CNC Machined Hex Bolt M12-1.75P x 50 mm
Quantity
850.00 NOS
Chemical Composition %
| Cu (Copper) | Sn (Tin) | Pb (Lead) | Zn (Zinc) | P (Phosphorus) | Fe (Iron) |
|---|---|---|---|---|---|
| Rem (88.33) | 4.10 | 4.20 | 3.20 | 0.15 | 0.02 |
| Remainder | Min: 3.5 Max: 4.5 |
Min: 3.5 Max: 4.5 |
Min: 1.5 Max: 4.5 |
Min: 0.01 Max: 0.50 |
Max: 0.10 |
Mechanical Properties (Hard Temper / H04)
| TENSILE STRENGTH (MPa) | YIELD STRENGTH 0.5% Ext (MPa) | % ELONGATION (GL-50mm) | HARDNESS (HRB) |
|---|---|---|---|
| 460.50 | 385.20 | 15.00 | 82, 80, 81 |
| Min: 415 (60 ksi) | Min: 345 (50 ksi) | Min: 10 | Typical: 75-85 |
Standard References & Compliance
Our MTC certificates for nonferrous fasteners align with the stringent requirements of the electrical, aerospace, and heavy machinery industries. The test reports confirm exact compliance with ASTM F468 and ASTM B139 with respect to the specific heat and lot tested.
| Standard / Requirement | Confirmation on Certificate |
|---|---|
| Visual Inspection | 100% visual inspection carried out & found free from defects. |
| Magnetic Permeability | Material is confirmed completely Non-Magnetic. |
| Machinability Rating | Material conforms to the 80% free-cutting standard. |
| Dimensional Accuracy | All Dimensions are as per PO Specification / ASME B18.2.1. |
Certification Details
We confirm that the above mentioned items were Manufactured, Sampled, Tested, and Inspected in accordance with the subjected Customer's Purchase Order and applicable Drawings, Material Specifications, Codes & Standards.
Documentation Standard
- EN 10204-2004: 3.1 Standard
- Free from radioactive contamination
- Certified ISO 9001: 2015 Company
Processing State
- Cold Drawn Bar Stock
- Hard Temper (H04) for stability
Testing Conditions
- Mechanical tests carried out at room temp
- 100% thread profile gauging carried out
Technical FAQs — UNS C54400 Phosphor Bronze MTC
How does C54400 differ from standard C51000 Phosphor Bronze?
Standard C51000 Phosphor Bronze offers high strength and fatigue resistance but is very difficult to machine. C54400 is modified by adding approximately 4% Lead and 3% Zinc. The Lead acts as a chip-breaker and internal lubricant, giving C54400 an outstanding machinability rating of 80% (compared to C51000's 20%), making it the go-to alloy for complex, CNC-turned bronze fasteners.
Why is C54400 often called "Bearing Bronze"?
The same dispersed Lead particles that make the alloy easy to machine also provide excellent anti-friction properties in service. When a C54400 fastener is subjected to heavy loads or dynamic movement against another metal surface, it resists galling and wear far better than standard brass or steel, acting similarly to a lubricated bearing.
Are there any environmental restrictions for this alloy?
Yes. Because UNS C54400 contains a significant amount of Lead (3.5% - 4.5%), it does not meet the "Lead-Free" requirements mandated for modern potable (drinking) water systems. Its use is restricted to industrial, marine, aerospace, and heavy machinery applications where water toxicity is not a factor.