ASTM F467 UNS C71000 Copper Nickel Nuts

ASTM F467 UNS C71000 represents grade specification for Copper Nickel Grade C71000 Nut, Fasteners. It covers both coarse and fine threaded Copper Nickel Nuts. Below is the chemical, mechanical and other requirements. ASTM F467 UNS C71000 Fasteners carry EN 10204 Type 3.1 Certification.

ASTM F467 UNS C71000 Chemical Requirements

Composition, %
Copper and Copper Base Alloys
UNS Designation Alloy General Name Aluminum Copper, min Iron, max Manganese, max Nickel, max Phosphorus Silicon Zinc, maxA Lead, max Tin Arsenic, max
C71000 710 Cupro Nickel -- 74.0D 0.60 1.00 19.0 - 23.0C -- 1.00 0.05 -- --

A Elements shown as balance shall be arithmetically computed by deducting the sum of the other named elements from 100.
B Copper plus specified elements = 99.8 min; copper plus silver = 88.5-91.5.
C Cobalt is to be counted as nickel
D Minimum content of copper plus all other elements with specified limits shall be 99.5%.
E An alloy containing as high as 2.5% silicon is acceptable provided the sum of all the lements other than copper, silicon and iron does not exceed 0.30 %.

ASTM F467 UNS C71000 Mechanical Requirements

Alloy Mechanical Property Marking Nominal Thread Diameter, inch HardnessA Proof Stress, min, ksi
Copper Nickel
Cu 710 F 467P all 50 HRB 45

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 UNS C71000 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:,br> 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