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.

Technical Data

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
Diameter	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. 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
Grade	Material	% by weight	% by weight	% by weight
2	Low Carbon Steel	0.55 max	0.12 (1)	0.15 max (2)

1. Resulfurized and rephosphorized material is not subject to rejection based on check analysis for sulfur.
2. If agreed between purchaser and producer, sulfur content may be 0.23 maximum.

Dimensional SpecificationsGrade 2

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

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
1/4	20	7/16	0.2188	NF2B0250000	In Stock	$0.01612/EA	EA	EA
1/4	28	7/16	0.2187	NF2B025NF00	3-5 Working Days	$0.04186/EA	EA	EA
5/16	18	1/2	0.2656	NF2B0310000	In Stock	$0.0329/EA	EA	EA
5/16	24	1/2	0.2656	NF2B031NF00	3-5 Working Days	$0.03879/EA	EA	EA
3/8	16	9/16	0.3281	NF2B0370000	In Stock	$0.04539/EA	EA	EA
3/8	24	9/16	0.3281	NF2B037NF00	3-5 Working Days	$0.03989/EA	EA	EA
7/16	14	11/16	0.3750	NF2B0430000	In Stock	$0.03906/EA	EA	EA
1/2	13	3/4	0.4375	NF2B0500000	In Stock	$0.07189/EA	EA	EA
1/2	20	3/4	0.4375	NF2B050NF00	3-5 Working Days	$0.11521/EA	EA	EA
5/8	11	15/16	0.5469	NF2B0620000	In Stock	$0.1975/EA	EA	EA
3/4	10	1 1/8	0.6406	NF2B0750000	In Stock	$0.28642/EA	EA	EA
7/8	9	1 5/16	0.75	NF2B0870000	In Stock	$0.47871/EA	EA	EA
1	8	1 1/2	0.8594	NF2B1000000	In Stock	$1.93042/EA	EA	EA
1 1/8	7	11/16	0.9687	NF2B1120000	In Stock	$0.60484/EA	EA	EA
1 1/4	7	1 7/8	1.0625	NF2B1250000	In Stock	$1.5121/EA	EA	EA
1 1/2	6	2 1/4	1.2812	NF2B1500000	In Stock	$2.44671/EA	EA	EA

Grade 2 Hex Nut

Technical Data

Tab 1

Governing StandardsGrade 2

Tab 2

Mechanical PropertiesGrade 2

Tab 3

Chemical PropertiesGrade 2

Tab 4

Dimensional SpecificationsGrade 2

Product Specification

Grade

Diameter

Thread Pitch

Thread Type

Width Across Flats