Related Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
ASME B18.2.2 Square Nut Dimensions
Industrial square nuts manufactured according to ASME B18.2.2 dimensional and fastening standards.
ASME B18.2.2 Square Nuts are designed for industrial and structural fastening applications requiring strong surface contact and reliable assembly performance. These square nuts are commonly used in heavy-duty mechanical systems, construction projects, maintenance operations, and industrial fastening applications where secure fastening and long-term durability are essential.
ASME B18.2.2 Square Nuts Dimensions (mm)
| Nominal Size (in) | Basic Major Diameter | Width Across Flats, F | Width Across Corners, G | Thickness | Runout to Thread Axis, FIM | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Basic | Min. | Max. | Min. | Max. | Basic | Min. | Max. | |||
| 1/4 | 6.350 | 11.11 | 10.80 | 11.13 | 14.07 | 15.72 | 5.56 | 5.16 | 5.97 | 0.28 |
| 5/16 | 7.938 | 14.29 | 13.89 | 14.27 | 18.31 | 20.19 | 6.75 | 6.32 | 7.19 | 0.38 |
| 3/8 | 9.525 | 15.88 | 15.39 | 15.88 | 20.37 | 22.45 | 8.33 | 7.87 | 8.79 | 0.41 |
| 7/16 | 11.113 | 19.05 | 18.49 | 19.05 | 24.64 | 26.95 | 9.53 | 9.04 | 10.01 | 0.48 |
| 1/2 | 12.700 | 20.64 | 20.02 | 20.62 | 26.72 | 29.18 | 11.11 | 10.62 | 11.63 | 0.56 |
| 5/8 | 15.875 | 25.40 | 24.61 | 25.40 | 33.02 | 35.92 | 13.89 | 13.34 | 14.45 | 0.66 |
| 3/4 | 19.050 | 28.58 | 27.64 | 28.58 | 37.19 | 40.41 | 16.67 | 16.05 | 17.27 | 0.74 |
| 7/8 | 22.225 | 33.34 | 32.23 | 33.32 | 43.48 | 47.14 | 19.45 | 18.80 | 20.12 | 0.86 |
| 1 | 25.400 | 38.10 | 36.83 | 38.10 | 49.81 | 53.87 | 22.23 | 21.51 | 22.94 | 0.99 |
| 1 1/8 | 28.575 | 42.86 | 41.43 | 42.88 | 56.11 | 60.60 | 25.40 | 24.64 | 26.16 | 0.74 |
| 1 1/4 | 31.750 | 47.63 | 46.02 | 47.63 | 62.43 | 67.36 | 27.78 | 26.97 | 28.60 | 0.81 |
| 1 3/8 | 34.925 | 52.39 | 50.65 | 52.37 | 68.78 | 74.09 | 30.56 | 29.69 | 31.42 | 0.89 |
| 1 1/2 | 38.100 | 57.15 | 55.25 | 57.15 | 75.08 | 80.82 | 33.34 | 32.41 | 34.24 | 0.99 |
ASME B18.2.2 Square Nuts Dimensions (Inch)
| Nominal Size | Basic Major Diameter of Thread | Width Across Flats, F | Width Across Corners, G | Thickness | Bearing Surface Runout to Thread Axis, FIM | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Basic | Min. | Max. | Min. | Max. | Basic | Min. | Max. | |||
| 1/4 | 0.2500 | 7/16 | 0.425 | 0.438 | 0.554 | 0.619 | 7/32 | 0.203 | 0.235 | 0.011 |
| 5/16 | 0.3125 | 9/16 | 0.547 | 0.562 | 0.721 | 0.795 | 17/64 | 0.249 | 0.283 | 0.015 |
| 3/8 | 0.3750 | 5/8 | 0.606 | 0.625 | 0.802 | 0.884 | 21/64 | 0.310 | 0.346 | 0.016 |
| 7/16 | 0.4375 | 3/4 | 0.728 | 0.750 | 0.970 | 1.061 | 3/8 | 0.356 | 0.394 | 0.019 |
| 1/2 | 0.5000 | 13/16 | 0.788 | 0.812 | 1.052 | 1.149 | 7/16 | 0.418 | 0.458 | 0.022 |
| 5/8 | 0.6250 | 1 | 0.969 | 1.000 | 1.300 | 1.414 | 35/64 | 0.525 | 0.569 | 0.026 |
| 3/4 | 0.7500 | 1 1/8 | 1.088 | 1.125 | 1.464 | 1.591 | 21/32 | 0.632 | 0.680 | 0.029 |
| 7/8 | 0.8750 | 1 5/16 | 1.269 | 1.312 | 1.712 | 1.856 | 49/64 | 0.740 | 0.792 | 0.034 |
| 1 | 1.0000 | 1 1/2 | 1.450 | 1.500 | 1.961 | 2.121 | 7/8 | 0.847 | 0.903 | 0.039 |
| 1 1/8 | 1.1250 | 1 11/16 | 1.631 | 1.688 | 2.209 | 2.386 | 1 | 0.970 | 1.030 | 0.029 |
| 1 1/4 | 1.2500 | 1 7/8 | 1.812 | 1.875 | 2.458 | 2.652 | 1 3/32 | 1.062 | 1.126 | 0.032 |
| 1 3/8 | 1.3750 | 2 1/16 | 1.994 | 2.062 | 2.708 | 2.917 | 1 13/64 | 1.169 | 1.237 | 0.035 |
| 1 1/2 | 1.5000 | 2 1/4 | 2.175 | 2.250 | 2.956 | 3.182 | 1 5/16 | 1.276 | 1.348 | 0.039 |
Frequently Asked Questions
What grades of nonferrous metal does ASTM F467 cover for square nuts?
ASTM F467 covers copper (C11000), brass (C26000, C27000, C46200, C46400), bronze (C51000 phosphor, C61300/C61400/C63000 aluminum, C64200, C65100/C65500/C66100 silicon, C67500 manganese), cupro-nickel (C71000, C71500), nickel-base alloys (N04400 Monel 400, N04405, N05500 Monel K-500, N06059 Alloy 59, N06625 Inconel 625, N06686, N10001 Hastelloy B-2, N10276 Hastelloy C-276), aluminum (A92024, A96061, A97075), and titanium grades - all available for this nut family at TorqBolt.
What is the dimensional standard for these square nuts?
This product follows ASME B18.2 2, the dimensional standard for square nuts. Material chemistry, mechanical properties, and acceptance criteria follow ASTM F467 / F467M for nonferrous bolting. TorqBolt supplies both inch-series and metric sizes per the applicable ASME or ISO drawing.
Which F467 grades are best for marine and seawater service?
For seawater bolting per F467: Monel 400 (N04400) and Monel K-500 (N05500) resist chloride stress-corrosion cracking and HF acid; nickel-aluminum bronze C63000 is the standard high-strength marine fastener; cupro-nickel C71500 is preferred for condenser tube-sheet bolting; naval brass C46400 is the lower-cost option for routine marine hardware; titanium Grade 2 (R50400) is the premium choice for severe chloride + chemical service.
Are F467 square nuts NACE MR0175 acceptable for sour service?
Most F467 nickel and titanium grades are NACE MR0175 / ISO 15156-listed: Monel 400 (N04400), Monel K-500 (N05500) conditional, Inconel 625 (N06625), Hastelloy B-2 (N10001), Hastelloy C-276 (N10276), Alloy 59 (N06059), Alloy 686 (N06686), and all titanium grades (R50400, R52400, R56400, R56401). Aluminum bronzes are generally not preferred for sour service. TorqBolt provides NACE-compliant heat-treat and hardness reports on request.
References & Standards
- ASTM F467 / F467M - Standard Specification for Nonferrous Nuts for General Use
- ASTM F468 / F468M - Companion specification for Nonferrous Bolts, Hex Cap Screws, and Studs (mate with F467 nuts for matched-alloy assemblies)
- ASTM F436 / F436M - Hardened steel washers (ferrous washer companion when nonferrous washers are not specified)
- NACE MR0175 / ISO 15156 - Sour-service hardness limits for petroleum and natural gas industries
- ASME B18.2.2 / B18.2.4.1M / B18.2.4.6M and ISO 4032 / 4033 / 4035 - Dimensional standards referenced by F467
- DIN 934 / 439 / 6330 - Metric hex nut dimensional standards
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