Grade 2 Hex Nut
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Grade 2 Hex Nut

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 zinc plated finish. Zinc plating sacrifices itself, corroding before the base material, offering added corrosion resistance.

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
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Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM
1/4 20 7/16 0.2188 NF2B0250000 In Stock $0.01612/EA EA
1/4 28 7/16 0.2187 NF2B025NF00 3-5 Working Days $0.04186/EA EA
5/16 18 1/2 0.2656 NF2B0310000 In Stock $0.03294/EA EA
5/16 24 1/2 0.2656 NF2B031NF00 3-5 Working Days $0.03879/EA EA
3/8 16 9/16 0.3281 NF2B0370000 In Stock $0.04767/EA EA
3/8 24 9/16 0.3281 NF2B037NF00 3-5 Working Days $0.03989/EA EA
7/16 14 11/16 0.3750 NF2B0430000 In Stock $0.03906/EA EA
1/2 13 3/4 0.4375 NF2B0500000 In Stock $0.07185/EA EA
1/2 20 3/4 0.4375 NF2B050NF00 3-5 Working Days $0.11521/EA EA
5/8 11 15/16 0.5469 NF2B0620000 In Stock $0.19732/EA EA
3/4 10 1 1/8 0.6406 NF2B0750000 In Stock $0.2937/EA EA
7/8 9 1 5/16 0.75 NF2B0870000 In Stock $0.47871/EA EA
1 8 1 1/2 0.8594 NF2B1000000 In Stock $0.78814/EA EA
1 1/8 7 11/16 0.9687 NF2B1120000 In Stock $0.60484/EA EA
1 1/4 7 1 7/8 1.0625 NF2B1250000 In Stock $1.5121/EA EA
1 1/2 6 2 1/4 1.2812 NF2B1500000 In Stock $2.44671/EA EA