Grade 2 Hex Nut, Galvanized
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Grade 2 Hex Nut, Galvanized

SAE J995 Grade 2 hex nuts are an economical, common low strength nut manufactured from low carbon steel. Grade 2 hex nuts are available in diameters from 1/4" through 1 1/2" inclusive. Dimensional specifications are governed by ASME B18.2.2. These nuts are equivalent in strength to ASTM A563 Grade A nuts. Grade 2 nuts are commonly used in bolting applications with Grade 2 bolts, Grade 5 bolts, and A307 bolts. Available in hot dip galvanized finish, which provides a corrosion resistant zinc coating.

Governing StandardsGrade 2

SAE J995 Covers the mechanical and material requirements for inch series fasteners used in automotive and related industries in diameters through 1-1/2″.
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.

Grade 2 Marking
Grade 2 requires no material marking

Mechanical PropertiesGrade 2

Low Carbon Steel Per SAE J995 2017-07
Diameter Proof Load Stress (1) Core Hardness
psi Rockwell
1/4 thru 1 1/2" UNC & 8UN 90,000 C32 Max
1/4 thru 1 1/2" UNF, 12UN and Finer 80,000 C32 Max
  1. 1. The proof load in pounds for nuts is computed by multiplying the proof load stress, in psi (lbf/in2), for the nut grade, size, thread series, and type, as shown in Table 2, and tensile stress area in square inches (in2), for the applicable size and thread series shown in Table 3. (For tabulated values see Appendix A.) To convert the inch based pounds per square inch (psi) values above to metric Megapascal (MPa) units, multiply the above values by .00689.

Chemical PropertiesGrade 2

Per SAE J995 2017-07
Grade Material Carbon Phosphorus Sulfur
% by weight % by weight % by weight
2 Low Carbon Steel 0.55 max 0.12 (1) 0.15 max (2)
  1. 1. Resulfurized and rephosphorized material is not subject to rejection based on check analysis for sulfur.
  2. 2. If agreed between purchaser and producer, sulfur content may be 0.23 maximum.

Dimensional SpecificationsGrade 2

Finished 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
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.
Grade 2 Hex Nut, Galvanized
View
Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM
1/4 20 7/16 0.2188 NF2G0250000 In Stock $0.03554/EA EA
5/16 18 1/2 0.2656 NF2G0310000 In Stock $0.04818/EA EA
3/8 16 9/16 0.3281 NF2G0370000 In Stock $0.07519/EA EA
7/16 14 11/16 0.3750 NF2G0430000 In Stock $0.09898/EA EA
1/2 13 3/4 0.4375 NF2G0500000 In Stock $0.15726/EA EA
9/16 12 7/8 0.4844 NF2G0560000 In Stock $1.12569/EA EA
5/8 11 15/16 0.5469 NF2G0620000 In Stock $0.30775/EA EA
3/4 10 1 1/8 0.6406 NF2G0750000 In Stock $0.47342/EA EA
7/8 9 1 5/16 0.75 NF2G0870000 In Stock $0.66989/EA EA
1 8 1 1/2 0.8594 NF2G1000000 In Stock $1.35063/EA EA
1 1/8 7 11/16 0.9688 NF2G1120000 In Stock $1.32776/EA EA
1 1/4 7 1 7/8 1.0625 NF2G1250000 In Stock $1.99036/EA EA
1 3/8 6 2 1/16 1.6875 NF2G1370000 In Stock $2.61321/EA EA
1 1/2 6 2 1/4 1.2813 NF2G1500000 In Stock $3.61575/EA EA
1 3/4 5 2 5/8 1.5 NF2G1750000 In Stock $4.37052/EA EA
2 4 3 1.7188 NF2G2000000 In Stock $6.50685/EA EA