Brass alloy nuts engineered for strength, corrosion resistance, and industrial reliability.
ASTM F467/F467M Grade C26000 Alloy 260 Nuts are widely used in architectural, industrial, and engineering applications because of their excellent corrosion resistance and machinability.
| UNS Designation Number | Alloy | General Name | Al | Cu, min | Fe, max | Mn, max | Ni, max | P | Si | Zn, max A | Pb, max | Tin | As, max |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ASTM F467/F467M Grade C26000 | 260 | brass | . . . | 68.5-71.5 | 0.05 | . . . | . . . | . . . | . . . | balance | 0.07 | . . . | . . . |
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| Alloy | Mechanical Property Marking | Hardness, min A | Proof Stress, Hex Nut min, ksi | Proof Stress, Heavy Hex Nut min, ksi B |
|---|---|---|---|---|
| ASTM F467 Alloy Cu 260 | F467AB | 55 HRF | 60 | 65 |
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| Alloy | Mechanical Property Marking | Hardness, min A | Proof Stress, Mpa |
|---|---|---|---|
| ASTM F467M Cu 260 | F467MAB | 55 HRF | 415 |
| Nominal Size, in. | Coarse Threads-UNC | Fine Threads-UNF | 8 Thread Series-8UN | |||
|---|---|---|---|---|---|---|
| Threads/in. | Stress Area A, in 2 | Threads/in. | Stress Area A, in 2 | Threads/in. | Stress Area A, in 2 | |
| 1/ 4 | 20 | 0.0318 | 28 | 0.0364 | . . . | . . . |
| 5/ 16 | 18 | 0.0524 | 24 | 0.0580 | . . . | . . . |
| 3/ 8 | 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 |
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| Nominal Nut Diameter and Thread Pitch | Stress Area, Amm 2 | Nominal Nut Diameter and Thread Pitch | Stress Area, Amm 2 |
|---|---|---|---|
| M6 × 1 | 20.1 | M16 × 2 | 157 |
| M8 × 1.25 | 36.6 | M20 × 2.5 | 245 |
| M10 × 1.5 | 58.0 | M24 × 3 | 353 |
| M12 × 1.75 | 84.3 | M30 × 3.5 | 561 |
| M14 × 2 | 115 | M36 × 4 | 817 |
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Except as provided in 4.2.3, nuts are furnished in the condition below (4.2.2). When required, stress relieving is specified by the purchaser for all copper alloys and nickel alloys 400 and 405 (4.2.3). Unless otherwise specified, nuts may be hot pressed, cold formed or machined at the manufacturer's option (4.2.1).
| Alloy | Condition |
|---|---|
| Copper (all alloys) | As formed or stress relieved at manufacturer's option |
| Nickel alloys 400 and 405 | As formed or stress relieved at manufacturer's option |
| Nickel alloy 500 | Solution annealed and aged |
| Aluminum alloy 2024-T4 | Solution treated and naturally aged |
| Aluminum alloy 6061-T6 | Solution treated and artificially aged |
| Aluminum alloy 6262-T9 | Solution treated, artificially aged, and cold worked |
| Titanium 625 | Annealed |
UNS C26000 is alloy 260, listed in Table 1 of ASTM F467-13ε2 as brass. Key composition limits: copper 68.5-71.5 %, iron 0.05 % max, lead 0.07 % max, zinc balance. Copper alloys are furnished as formed or stress relieved at the manufacturer's option (4.2.2); when stress relieving is required, the purchaser specifies it (4.2.3). When the purchaser specifies Supplementary Requirement S1, the nuts must show no cracking after 30 min immersion in aqueous mercurous nitrate per ASTM B154.
Table 2 requires a minimum hardness of 55 HRF and a minimum proof stress of 60 ksi for hex nuts and 65 ksi for heavy hex nuts. Heavy hex values are 1.08 times the hex nut value (note B). Where both proof load and hardness are tested, proof load governs acceptance (6.2).
Proof load is the Table 2 proof stress times the Table 4 tensile stress area (13.2.1, tested per ASTM F606). For 1/2-13 UNC the stress area is 0.1419 sq in, so a hex nut must carry 8,514 lbf (60 ksi) and a heavy hex nut 9,224 lbf (65 ksi) without failure.
Each nut carries the manufacturer's symbol and the Table 2 marking F 467AB, raised or depressed (17.1). Unless otherwise specified, dimensions are to ASME B18.2.2 (7.1), threads are Class 2B to ASME B1.1 (7.2) and nuts are furnished without any additive chemical or metallic finish (8.2). Mating bolts, cap screws and studs are covered by ASTM F468 (1.2).
