Naval Brass C46400
The marine brass — 1 percent tin for seawater resistance — and the ASTM F468 structural brass fastener alloy (F468D).
What C46400 Naval Brass is.
Naval brass C46400 is a 60-40 brass with about 1 percent tin. The tin markedly improves resistance to dezincification and seawater corrosion, which is why the alloy has been used for marine hardware, condenser plates and propeller shafts for more than a century. It is hot workable, machines well and is the brass listed in ASTM F468 for bolts and studs.
We machine naval brass fasteners and components from certified B21 rod and certify them to F468 (marking F468D) and F467 (F467D).
Chemical composition.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Copper | Cu | 59.0 | 62.0 |
| Tin | Sn | 0.50 | 1.0 |
| Lead | Pb | — | 0.20 |
| Iron | Fe | — | 0.10 |
| Zinc | Zn | balance | — |
Values per ASTM B21/B21M-20 Table 1 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team.
Mechanical properties.
| Nominal diameter (in.) | Hardness | Full-size tensile (ksi) | Full-size yield, min (ksi) | Machined tensile, min (ksi) | Machined yield, min (ksi) | Elongation in 4D, min (%) |
|---|---|---|---|---|---|---|
| All sizes | 55–75 HRB | 50–80 | 15 | 50 | 15 | 25 |
Values per ASTM F468-23 Table 2 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team. Full-size tensile range and yield; machined-specimen minimums in the last three columns.
| Nut style | Hardness, min | Proof stress, min (ksi) |
|---|---|---|
| Hex and hex flange | 55 HRB | 50 |
| Heavy hex, large hex flange and thick | 55 HRB | 54 |
Values per ASTM F467-24 Table 2 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team.
| Temper and size (in.) | Tensile strength, min (ksi) | Yield strength at 0.5 % extension, min (ksi) | Elongation, min (%) |
|---|---|---|---|
| O60 soft anneal — 1 and under | 54 | 20 | 30 |
| H02 half-hard — ½ and under | 60 | 27 | 22 |
| H02 half-hard — over ½ to 1 | 60 | 27 | 25 |
| H02 half-hard — over 1 to 2 | 58 | 26 | 25 |
| H02 half-hard — over 2 to 3 | 54 | 25 | 25 |
| H04 hard — 1 and under | 67 | 45 | 13 |
| H04 hard — over 1 to 2 | 62 | 37 | 18 |
Values per ASTM B21/B21M-20 Table 2 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team.
Specifications that apply.
How C46400 Naval Brass ships from Houston.
- Hex bolts, studs and cap screws to F468
- Hex and heavy hex nuts to F467
- Marine hardware and valve components machined to print
- Certified B21 rod and bar
C46400 Naval Brass fasteners we make.
Every item is manufactured to your drawing or standard in C46400 Naval Brass, imperial or metric, with an EN 10204 3.1 certificate.
What is naval brass?
Naval brass is Muntz metal, the 60-40 copper-zinc alloy, with roughly 1 percent tin. Zinc-rich brasses lose zinc in seawater and leave behind a porous copper sponge; the tin addition suppresses that dezincification and gives the alloy its marine reputation. It is stronger than the single-phase alpha brasses, forges well when hot and machines at about 30 percent of the free-cutting rating.
As a fastener
ASTM F468 lists naval brass as Cu 464 with marking F468D: 50 to 80 ksi full-size tensile, 15 ksi yield and 55 to 75 HRB. Nuts are F467D with a 50 ksi proof stress. Those are modest numbers, so naval brass fasteners are chosen for corrosion resistance, non-sparking behaviour and appearance rather than load; for higher strength in the same environment use silicon bronze or nickel-aluminum bronze.
Testing, certification and marking
- Tensile and hardness tested per lot on the finished product
- Grade or alloy marking F468D on bolts and F467D on nuts and manufacturer's identification on every piece
- EN 10204 3.1 material test report with heat number and chemistry; 3.2 witness available
- Alloy identified by UNS number on the certificate
Recent C46400 Naval Brass jobs.
High-Silicon Bronze C65500
The strongest common silicon bronze in bar form, 90 ksi in hard temper and 100 ksi extra-hard in small rod — for machined marine fasteners, valve stems and pump parts.
ASTM B16 rod and barFree-Cutting Brass C36000
The fastest-machining engineering metal — 3 percent lead brass for turned fittings, terminals, valve parts and volume screw-machine work.
ASTM F468 / F467 fasteners · ASTM B150 rod and barNickel-Aluminum Bronze C63000
Steel-like strength in a bronze — 100 to 130 ksi as a fastener — with seawater, cavitation and wear resistance for propellers, pumps, valve seats and subsea hardware.