The titanium & titanium alloy fasteners include titanium bolts, screws & studs manufactured to ASTM F468 / F468M and titanium nuts manufactured to ASTM F467 / F467M. Both of the standards cover 8 grades of titanium & titanium alloys: titanium Grade 1 (R50250), Grade 2 (R50400), Grade 4 (R50700), Grade 5 (R56400), Grade 7 (R52400), Grade 19 (R58640, Ti-38-6-44), Grade 23 (R56401, Ti-6Al-4V ELI), Grade 32 (R55111, Ti-5-1-1-1). The fasteners can be cold formed, hot formed, or machined from suitable material.
ASTM F467 / F467M Titanium & Titanium Alloy Nuts
ASTM F467 / F467M covers wrought titanium & titanium alloy nuts 0.25″ to 1.50″ inclusive in diameter [M6 to M36 in nominal thread diameters]. The materials may be manufactured to ASME B18.2.2, ASME B18.2.4.1M, and other standards upon purchaser’s request. Its screw threads shall be furnished in accordance with ASTM B1.13M.
| Ti & Ti Alloy | Hardness | Proof Stress | |
|---|---|---|---|
| Grade | min. | ksi | MPa |
| 1 | 140 HV | 40 | 275 |
| 2 | 150 HV | 55 | 380 |
| 4 | 200 HV | 85 | 585 |
| 5 | 30 HRC | 135 | 930 |
| 7 | 160 HV | 55 | 380 |
| 19 | 24 HRC | 120 | 825 |
| 23 | 25 HRC | 125 | 860 |
| 32 | 24 HRC | 105 | 725 |
*Mechanical properties of titanium & titanium alloy nuts in accordance with ASTM F467 / F467M.
ASTM F468 / F468M Titanium & Titanium Alloy Bolts, Screws & Studs
ASTM F468 / F468M covers wrought titanium & titanium alloy bolts, screws, and studs 0.25″ to 1.50″ inclusive in diameter [M6 to M36 in nominal thread diameters]. The materials may be manufactured to ASME B18.2.1, ASME B18.2.3.1M, and ASME B18.2.3.5M.
| Ti & Ti Alloy | Tensile Strength, min. | Yield Strength, min. | Hardness | Elongation | ||
|---|---|---|---|---|---|---|
| Grade | ksi | MPa | ksi | MPa | - | min. % |
| 1 | 35 | 240 | 25 | 170 | 140~160 HV | 24 |
| 2 | 50 | 345 | 40 | 275 | 160–180 HV | 20 |
| 4 | 80 | 550 | 70 | 483 | 200–220 HV | 15 |
| 5*Class A | 130 | 895 | 120 | 828 | 30–39 HRC | 10 |
| 5*Class B | 130 | 895 | 120 | 828 | 30–39 HRC | 10 |
| 7 | 50 | 345 | 40 | 275 | 160–180 HV | 20 |
| 19 | 120 | 793 | 115 | 759 | 24–38 HRC | 15 |
| 23 | 120 | 828 | 110 | 759 | 25–36 HRC | 10 |
| 32 | 100 | 690 | 85 | 585 | 24–38 HRC | 10 |
*Mechanical properties of titanium & titanium alloy bolts, screws, and studs in accordance with ASTM F468 / F468M.
*Both Class A and Class B of Titanium Gr.5 require wedge tensile testing.
*The tensile & yield strength and elongation shall be based on machined specimen tests.
