UNS R52400

ASTM F468 UNS R52400 represents grade specification for Titanium Grade 7 Bolts, Screw Fasteners. It covers both coarse and fine threaded Ti Alloy 7 Bolts, screws, stud bolts. Below is the chemical, mechanical and other requirements. ASTM F468 UNS R52400 Fasteners carry EN 10204 Type 3.1 Certification.

ASTM F468 UNS R52400 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
R52400	7	Titanium Grade 7	--	0.10	0.30	balance	0.0125	0.05	0.25	0.12 - 0.25	--	--	--	--	--	--	--	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 F468.
^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 F468 Mechanical Properties

Alloy	Mechanical Property Marking	Nominal Thread Diameter, inch	HardnessA	Full Size Tests B		Machined Specimen Tests
				Tensile Strength, min, ksi	Yield Strength, min, ksiC	Tensile Strength, min, ksi	Yield Strength, min, ksiC	Elongation in 4D, min %D
Titanium Alloys
Ti 7	F 468ET	all	160 - 180 HV	50 - 85	45	50	40	20

^A where both tension and hardness tests are performed, the tension tests shall take precedence for acceptance purposes. For alumium and titanium alloys, hardness tests are for information only.
^B The yield tensile strength values for full size products shall be computed by dividing the yield and maximum tensile load by the stress area for the product diameter and thread pitch as given in table on tensile stress areads.
^C Yield strength is the stress at which an offset of 0.2% gauge length occurs.
^D Elongation is determined using a gauge length of 4 diameters of test specimen in accordance with Test Methods E8.
^E "HF" denoted a hot formed product
^F Aluminum alloy temper designations are in accordance with ANSI H35.1.
^G Full size test mechanical properties apply to fasteners with a maximum diameter of 76 mm. Mechanical properties of larger sections shall be negotiated between the material manufacturer and the fastener producer.
^H Ti 5 Class A requires wedge test tensile testing in accordance with section 6.6 & Ti 5.5 Class B requires wedge tensile testing in accordance with section 6.5.1 of ASTM F468.

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