Silicon Bronze Hex Nut
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Silicon Bronze Hex Nut

Silicon Bronze hex nuts are made from an alloy of mostly copper and tin, containing a small amount of silicon. Dimensional specifications are governed by ASME B18.2.2 for finish nuts, and ASME B18.6.3 for the smaller diameter machine nuts. There are no grade markings on bronze hex nuts. Fasteners made from silicon bronze are ideal for naval construction and are popular in the marine industry, because they are resistant to salt water, electrically conductive and nonmagnetic. They are also commonly used in general construction, refineries, and the power and energy industry as well. Compared to brass fasteners, bronze is much harder and more resistant to corrosion.

Governing StandardsSilicon Bronze

ASME B18.2.2 Covers the complete general and dimensional data for the various types of inch series square and hex nuts, including machine screw nuts and coupling nuts.
ASME B1.1 UNC & UNF Class 2B Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Silicon Bronze Nut Head Marking
Silicon Bronze requires no material marking

Dimensional SpecificationsSilicon Bronze

Hex nut dimensions Hex nut dimensions
Per ASME B18.2.2-2015
Nominal Diameter UNC UNF F G H
Width Across Flats Width Across Corners Thickness
Basic Max Min Max Min Basic Max Min
#0 0.060 80 80 5/32 0.1560 0.1500 0.2210 0.2060 5/32 0.0500 0.0430
#1 0.073 64 72 5/32 0.1560 0.1500 0.2210 0.2060 5/32 0.0500 0.0430
#2 0.086 56 72 3/16 0.1880 0.1800 0.2650 0.2050 3/16 0.0660 0.0570
#3 0.099 48 64 3/16 0.1880 0.1800 0.2650 0.2050 3/16 0.0660 0.0570
#4 0.112 40 48 1/4 0.2500 0.2410 0.2890 0.2750 1/4 0.0980 0.0870
#5 0.125 40 44 5/16 0.3120 0.3020 0.3610 0.3440 5/16 0.1140 0.1020
#6 0.138 32 40 5/16 0.3120 0.3020 0.3610 0.3440 5/16 0.1140 0.1020
#8 0.164 32 36 11/32 0.3440 0.3320 0.3970 1.2540 11/32 0.1300 0.1170
#10 0.190 24 32 3/8 0.3750 0.3620 0.4330 1.4650 3/8 0.1300 0.1170
#12 0.216 24 28 7/16 0.4380 0.4380 0.5050 1.6750 7/16 0.1610 0.1480
1/4 0.2500 20 28 7/16 0.4380 0.4280 0.5050 0.4880 7/32 0.2260 0.2120
5/16 0.3125 18 24 1/2 0.5000 0.4890 0.5770 0.5570 17/64 0.2730 0.2580
3/8 0.3750 16 24 9/16 0.5630 0.5510 0.6500 0.6280 21/64 0.3370 0.3200
7/16 0.4375 14 20 11/16 0.6880 0.6750 0.7940 0.7680 3/8 0.3850 0.3650
1/2 0.5000 13 20 3/4 0.7500 0.7300 0.8660 0.8400 7/16 0.4480 0.4270
9/16 0.5625 12 18 7/8 0.8750 0.8610 1.0100 0.9820 31/64 0.4960 0.4730
5/8 0.6250 11 18 15/16 0.9380 0.9220 1.0830 1.0510 35/64 0.5590 0.5350
3/4 0.7500 10 16 1 1/8 1.1250 1.0880 1.2990 1.2400 41/64 0.6650 0.6170
7/8 0.8750 9 14 1 5/16 1.3120 1.2690 1.5160 1.4470 3/4 0.7760 0.7240
1 1.0000 8 14 1 1/2 1.5000 1.4500 1.7320 1.6530 55/64 0.8870 0.8310
1 1/8 1.1250 7 12 1 11/16 1.6880 1.6310 1.9490 1.8590 31/32 0.9990 0.9390
1 1/4 1.2500 7 12 1 7/8 1.8750 1.8120 2.1650 2.0660 1 1/16 1.0940 1.0300
1 3/8 1.3750 6 12 2 1/16 2.0620 1.9940 2.3820 2.2730 1 11/16 1.2060 1.3800
1 1/2 1.5000 6 12 2 1/4 2.2500 2.1750 2.5980 2.4800 1 9/32 1.3170 1.2450
  1. All dimensions are in inches.
Silicon Bronze Hex Nut
View
Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM
#6 32 5/16 0.1020 NFSB632 In Stock $0.2452/EA EA
#8 32 11/32 0.1170 NFSB832 In Stock $0.26154/EA EA
#10 24 3/8 0.1170 NFSB102 In Stock $0.34148/EA EA
#10 32 3/8 0.1170 NFSB103 In Stock $0.28606/EA EA
1/4 20 7/16 0.2120 NFSB0250000 In Stock $0.26314/EA EA
5/16 18 1/2 0.2580 NFSB0310000 In Stock $0.44061/EA EA
3/8 16 9/16 0.32 NFSB0370000 In Stock $0.65733/EA EA
7/16 14 11/16 0.3650 NFSB0430000 In Stock $1.79253/EA EA
1/2 13 3/4 0.4270 NFSB0500000 In Stock $1.55187/EA EA
5/8 11 15/16 0.5350 NFSB0620000 In Stock $2.6256/EA EA
3/4 10 1 1/8 0.6170 NFSB0750000 In Stock $7.22962/EA EA