ASTM F467 UNS R50250 represents grade specification for Titanium R50250 Nut, Fasteners. It covers both coarse and fine threaded Titanium Grade 1 Nuts. Below is the chemical, mechanical and other requirements. ASTM F467 UNS R50250 Fasteners carry EN 10204 Type 3.1 Certification.
| Composition, % Titanium and Titanium Base AlloysA |
||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UNS Designation | Alloy | General Name | Aluminum | Carbon | Iron | Titanium | Hydrogen | Nitrogen | Oxygen | Palladium | Vanadium | Chromium | Molybdenum | Zirconium | Tin | Silicon | ResidualsB | |
| Each | Total | |||||||||||||||||
| R50250 | 1 | Titanium Grade 1 | -- | 0.10 | 0.20 | balance | 0.0125 | 0.05 | 0.18 | 0.10 | 0.40 | |||||||
A All reported values are maximums, unless a range is specified.
B A residual is an element present in a metal or an alloy in small quantities inherent to the manufacturing process but not added intentionally. Residual elements need not be reported unless a report is specially required by the purchaser.
C Identical chemical requirements apply to both Class A and B as defined in Table 2 and 6.5 of ASTM F467.
D Ruthenium and palladium, or both, may be added to Grade 19 for enhanced corrosion resistance as negotiated between purchaser and vendor. Chemical analysis is not required unless specifically required by the purchaser.
| Alloy | Mechanical Property Marking | Nominal Thread Diameter, inch | HardnessA | Proof Stress, min, ksi |
|---|---|---|---|---|
| Titanium Alloys | ||||
| Ti 1 | F 467AT | all | 140 HV | 40 |
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 |
| Titanium | E120, E1409 |