ASTM F467 UNS R50250 Titanium Nuts / Titanium Grade 1 Nuts

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.

ASTM F467 UNS R50250 Chemical Requirements

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.

ASTM F467 UNS R50250 Mechanical Requirements

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.

Mechanical Test Requirements for Nuts

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.

Tensile Stress Areas and Threads per Inch

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.

Test Methods

Alloy Test Method
Titanium E120, E1409