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ASME B18.2.2 Rod Coupling Nut
  • ASME B18.2.2 Rod Coupling NutASME B18.2.2 Rod Coupling Nut

ASME B18.2.2 Rod Coupling Nut

Leader-Fastener® is a manufacturer and distributor of ASME B18.2.2 Rod Coupling Nut. We have a complete line of service from having invested in production plants, export department and to having a quality control team and center to meet your requirements. We regard quality as the life of the company. We persist in good quality as the first policy and have established a set of quality control and inspection system according to the international standard. We have carried out ISO9001 Quality Guarantee System in every course of production, transportation and selling. We do hope we could be your partner in business by topping quality, knight service and competitive price in the near future and be your friends as well.

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Product Description

Leader-Fastener® ASME B18.2.2 Rod Coupling Nut also known as Extension Nuts, are threaded fastener for joining two male threaded objects, most commonly threaded rod, but also pipes. The outside of the coupling nut is usually a hex so it can be gripped by a wrench.


Product Specification of ASME B18.2.2 Rod Coupling Nut

Material : Carbon steel, Stainless steel, Alloy Steel, Brass.

Finishment: Black, Zinc Plated, Zinc Yellow, HDG, Phosphate, DACROMET, Geomet, Magin, Ruspert, Teflon, etc.


Leader-Fastener® ASME B 18.2.2 - 2022 Hex Coupling Nuts [Table14] (ASTM A563)



Screw Thread #6 #8 #10 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8
d 0.1380 0.1640 0.1900 0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250 0.7500 0.8750
PP UNC 32 32 24 20 18 16 14 13 12 11 10 9
UNF 40 36 32 28 24 24 20 20 18 18 16 14
8-UN - - - - - - - - - - - -
s min 0.302 0.302 0.302 0.428 0.489 0.551 0.607 0.663 0.782 0.782 0.963 1.212
max=nominal size 0.312 0.312 0.312 0.438 0.500 0.562 0.625 0.688 0.813 0.813 1.000 1.250
e min 0.344 0.344 0.344 0.488 0.557 0.628 0.692 0.756 0.891 0.891 1.097 1.382
max 0.361 0.361 0.361 0.505 0.577 0.650 0.722 0.794 0.939 0.939 1.155 1.443
H Nominal Size 1/2 5/8 3/4 1-3/4 1-3/4 1-3/4 1-3/4 1-3/4 2-1/8 2-1/8 2-1/4 2-1/2
min 0.470 0.595 0.711 1.690 1.690 1.690 1.690 1.690 2.067 2.067 2.190 2.440
max 0.510 0.645 0.760 1.760 1.760 1.760 1.760 1.760 2.135 2.135 2.260 2.510


Screw Thread 1 1-1/8 1-1/4 1-1/2 1-5/8 1-3/4 1-7/8 2 2-1/4 2-1/2 2-3/4 3
d 1.0000 1.1250 1.2500 1.5000 1.6250 1.7500 1.8750 2.0000 2.2500 2.5000 2.7500 3.0000
PP UNC 8 7 7 6 - 5 - 4-1/2 4-1/2 4 4 4
UNF 12 12 12 12 - - - - - - - -
8-UN - 8 8 8 8 8 8 8 8 8 8 8
s min 1.325 1.450 1.575 1.950 2.481 2.662 2.844 3.025 3.388 3.750 4.112 4.475
max=nominal size 1.375 1.500 1.625 2.000 2.562 2.750 2.938 3.125 3.500 3.875 4.250 4.625
e min 1.511 1.653 1.825 2.275 2.828 3.035 3.242 3.448 3.862 4.275 4.688 5.101
max 1.588 1.732 1.876 2.309 2.959 3.175 3.392 3.608 4.041 4.474 4.907 5.340
H Nominal Size 2-3/4 3 3 3-1/2 4-7/8 5-1/4 5-5/8 6 6-3/4 7-1/2 8-1/4 9
min 2.690 2.940 2.940 3.440 4.830 5.210 5.580 5.950 6.700 7.440 8.190 8.940
max 2.760 3.010 3.010 3.510 4.910 5.290 5.670 6.040 6.800 7.550 8.310 9.060


Screw Thread 3-1/4 3-1/2 3-3/4 4 4-1/4 4-1/2 4-3/4 5 5-1/4 5-1/2 5-3/4 6
d 3.2500 3.5000 3.7500 4.0000 4.2500 4.5000 4.7500 5.0000 5.2500 5.5000 5.7500 6.0000
PP UNC 4 4 4 4 - - - - - - - -
UNF - - - - - - - - - - - -
8-UN 8 8 8 8 8 8 8 8 8 8 8 8
s min 4.838 5.200 5.562 5.925 6.288 6.650 7.012 7.375 7.738 8.100 8.462 8.825
max=nominal size 5.000 5.375 5.750 6.125 6.500 6.875 7.250 7.625 8.000 8.375 8.750 9.125
e min 5.515 5.928 6.340 6.754 7.168 7.581 7.994 8.408 8.821 9.234 9.647 10.060
max 5.773 6.206 6.639 7.072 7.506 7.939 8.372 8.805 9.238 9.671 10.104 10.537
H Nominal Size 9-3/4 10-1/2 11-1/4 12 12-3/4 13-1/2 14-1/4 15 15-3/4 16-1/2 17-1/4 18
min 9.680 10.430 11.170 11.920 12.670 13.420 14.160 14.910 15.650 16.400 17.150 17.890
max 9.810 10.570 11.320 12.080 12.830 13.580 14.340 15.090 15.850 16.600 17.350 18.110


①,Nuts shall be furnished without a hole, unless specially ordered by the purchaser. In some applications it may be desirable to assure that the threaded parts joined by a coupling nut are each engaged to approximately one-half nut thickness. As a visual inspection aid, a hole drilled through one side of the nut is recommended. The hole should be located at mid-nut thickness, and have a diameter of 0.2 to 0.4 times nominal nut size for sizes 2½ in and smaller, and 1 in for sizes 2¾ in and larger.



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