ASTM F468/F468M UNS C71000 Copper Nickel Bolts, Screws, Stud Bolts

ASTM F468 UNS C71000 represents grade specification for Copper Nickel (C71000) Bolts, Screw Fasteners. It covers both coarse and fine threaded copper nickel bolts, screws, stud bolts. Below is the chemical, mechanical and other requirements. ASTM F468 UNS C71000 Fasteners carry EN 10204 Type 3.1 Certification.

ASTM F468 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 F468 UNS C71000 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
Copper
Cu 710 F 468P all 50 - 85 HRF 45-75 15 45 15 40

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
Copper E52, E54, E62, E75, E478