ASTM F468/F468M UNS N06686 Inconel Alloy A286 Bolts, Screws, Stud Bolts.

ASTM F468 UNS N06686 represents grade specification for Inconel 686 Bolts, Screw Fasteners. It covers both coarse and fine threaded Alloy 686 Bolts, screws, stud bolts. Below is the chemical, mechanical and other requirements. ASTM F468 UNS N06686 Fasteners carry EN 10204 Type 3.1 Certification.

ASTM F468 UNS N06686 Chemical Requirements

Composition, %
Nickel and Nickel Base Alloys
UNS Designation Alloy General Name Aluminum Carbon, max Chromium CopperA Iron, max Manganese, max NickelA Phosphorus, max Silicon, max Titanium Cobalt, max Molybdenum Sulfur, max Vanadium Tungsten
N06686 686 Ni-Cr-Mo-W -- 0.010 max 19.0 - 23.0 -- 5.00 0.50 balance -- 0.08 0.02 - 0.25 -- 15.0 - 17.0 0.02 -- 3.0 - 4.4

A Elements shown as balance shall be arithmetically computed by deducting the sum of the other named elements from 100.
B Cobalt is to be counted as nickel.
C Alloy 625 material shall be refined using the electrostag remelting process (ESR), or the vacuum arc remelting process (VAR).

ASTM F468 UNS N06686 Mechanical Requirements

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
Nickel Alloys
Ni 686 Grade 1 F 468BN all 21 - 45 HRC 120 - 165 85 120 85 20
Ni 686 Grade 2 F 467CN all 23 - 47 HRC 135 - 185 125 135 125 20
Ni 686 Grade 3 F 468DN all 25 - 49 HRC 160 - 200 150 160 150 20
Ni 686 Grade 4 F 468EN all 65 HRB - 25 HRC 100 - 145 45 100 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.

Test Methods

Alloy Test Method
Copper E52, E54, E62, E75, E478
Aluminum E34, E101, E227
Nickel E38, E76, E354
Titanium E120, E1409