ASTM F468/F468M UNS A97075 Aluminum 7075 Bolts, Screws, Stud Bolts

ASTM F468 UNS A97075 represents grade specification for Aluminum Alloy 7075 Bolts, Screw Fasteners. It covers both coarse and fine threaded Alloy 7075 Bolts, screws, stud bolts. Below is the chemical, mechanical and other requirements. ASTM F468 UNS A97075 Fasteners carry EN 10204 Type 3.1 Certification.

ASTM F468 Chemical Requirements

Composition, %
Aluminum Base AlloysA
UNS Designation Alloy General Name AluminumB Chromium Copper Iron, max Manganese, max Silicon, max Titanium, max Zinc, max Magnesium Other Elements, max
Each Total
A97075 7075 Aluminum 7075 balance 0.18 - 0.35 1.20 - 2.00 0.50 0.30 0.40 0.20D 5.10 - 6.10 2.10 - 2.90 0.05 0.15

A Analysis shall regularly be made only for the elements specified in this table. If, however, the presend of other elements is suspected or indicated in amounts greater than the specified limits, further analysis shall be made to determine that these elements are not rpesent in excess of the specified limits.
B Elemens shown as balance shall be arithmetically computed by deducting the sum of the other named elements from 100.
C Titanium + Zirconium 0.20 %, max
D Titanium + Zirconium 0.25 %, max

ASTM F468 UNS A97075 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
Aluminum
Al 7075 - T73F F 468z all 80 - 90 HRF 61 - 76 50 68 45 25

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.

Remarks

For silicon bronze alloy 651, the thread length for bolts ordered with roll thread body diameter shall conform to the following:

Bolt Length, inch Thread Length
2.00 and less within 2 threads of the head
Over 2.00 to 6.00, incl. 2.00 inch min + 2 threads
Over 6.00 3.00 inc min + 2 threads

Test Methods

Alloy Test Method
Aluminum E34, E101, E227