ASTM F467 UNS N06625 Inconel Nuts / Inconel 625 Nuts

ASTM F467 UNS N06625 represents grade specification for Inconel N06625 Nut, Fasteners. It covers both coarse and fine threaded Inconel 625 Nuts. Below is the chemical, mechanical and other requirements. ASTM F467 UNS N06625 Fasteners carry EN 10204 Type 3.1 Certification.

ASTM F467 UNS N06625 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
N06625 625C Ni-Cr-No-Cb 0.40 max 0.010 max 20.0 - 23.0 -- 5.00 0.50 58.0 min 0.040 0.50 0.40 max 1.00 8.0 - 10.0 0.015 -- 3.2 - 4.2

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 F467 UNS N06625 Mechanical Requirements

Alloy Mechanical Property Marking Nominal Thread Diameter, inch HardnessA Proof Stress, min, ksi
Inconel 625
Ni 625 F 467AC all 85 HRB - 35 HRC 60

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
Nickel E38, E76, E354