ASTM F467 UNS C65500 represents grade specification for Silicon Bronze Grade C65500 Nut, Fasteners. It covers both coarse and fine threaded Silicon Bronze Nuts. Below is the chemical, mechanical and other requirements. ASTM F467 UNS C65500 Fasteners carry EN 10204 Type 3.1 Certification.
| Composition, % Copper and Copper Base Alloys |
|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UNS Designation | Alloy | General Name | Aluminum | Copper, min | Iron, max | Manganese, max | Nickel, max | Phosphorus | Silicon | Zinc, maxA | Lead, max | Tin | Arsenic, max |
| C65500 | 655 | Silicon Bronze | -- | 94.8D | 0.80 | 1.50 | 0.60 | -- | 2.8 - 3.8 | 1.50 | 0.05 | -- | -- |
A Elements shown as balance shall be arithmetically computed by deducting the sum of the other named elements from 100.
B Copper plus specified elements = 99.8 min; copper plus silver = 88.5-91.5.
C Cobalt is to be counted as nickel
D Minimum content of copper plus all other elements with specified limits shall be 99.5%.
E An alloy containing as high as 2.5% silicon is acceptable provided the sum of all the lements other than copper, silicon and iron does not exceed 0.30 %.
| Alloy | Mechanical Property Marking | Nominal Thread Diameter, inch | HardnessA | Proof Stress, min, ksi |
|---|---|---|---|---|
| Silicon Bronze | ||||
| Cu 655 | F 467L | all | 60 HRB | 50 |
A For Aluminum and titanium alloys hardness values are for information only.
B Aluminum alloy 2024-T4 shall be supplied in naturally aged condition. This material is not recommended for nuts in sizes greater than 1/4 ( 0.250) inch.
| Product | Proof Stress, ksi | Test Conducted Using Full Size Product | |
|---|---|---|---|
| Jam, slotted and castle nuts | All | A | -- |
| All other nuts | Up to 120 | -- | A |
| All other nuts | Over 120 | A | -- |
A Mandatory Tests.
| Nominal Size, inch. | Coarse Threads - UNC | Fine Threads - UNF | 8 Thread Series - 8UN | |||
|---|---|---|---|---|---|---|
| Threads / inch | Stress AreaA, in2 | Threads / inch | Stress AreaA, in2 | Threads / inch | Stress AreaA, in2 | |
| 1/4 | 20 | 0.0318 | 28 | 0.0364 | -- | -- |
| 5/16 | 18 | 0.0524 | 24 | 0.0580 | -- | -- |
| 3/18 | 16 | 0.0775 | 24 | 0.0878 | -- | -- |
| 7/16 | 14 | 0.1063 | 20 | 0.1187 | ||
| 1/2 | 13 | 0.1419 | 20 | 0.1599 | ||
| 9/16 | 12 | 0.1820 | 18 | 0.2030 | ||
| 5/8 | 11 | 0.2260 | 18 | 0.2560 | ||
| 3/4 | 10 | 0.3340 | 16 | 0.3730 | ||
| 7/8 | 9 | 0.4620 | 14 | 0.5090 | ||
| 1 | 8 | 0.6060 | 12 | 0.6630 | ||
| 1 1/8 | 7 | 0.7630 | 12 | 0.8560 | 8 | 0.790 |
| 1 1/4 | 7 | 0.9690 | 12 | 1.0730 | 8 | 1.000 |
| 1 3/8 | 6 | 1.1550 | 12 | 1.3150 | 8 | 1.233 |
| 1 1/2 | 6 | 1.4050 | 12 | 1.5810 | 8 | 1.492 |
A Tensile stress areas are computed using the following formula: As = 0.7854 [D- (0.9743/n)]2
Where:
As = Tensile stress area, in.2,
D = Nominal size (basic major diameter), in., and,
n = number of threads per inch.
| Alloy | Test Method |
| Copper | E52, E54, E62, E75, E478 |