Grade 8 Hex Nut, Plated

SAE J995 Grade 8 hex nuts are high-strength nuts manufactured from quenched and tempered carbon alloy steel. Grade 8 hex nuts are available in diameters from 1/4" through 1 1/2" inclusive. Dimensional specifications are governed by ASME B18.2.2. Grade markings include two circumferential lines located 60 degrees apart and the manufacturer's identification mark. Grade 8 hex nuts are commonly used on Grade 8 bolts. Available in zinc plated finish. Zinc plating sacrifices itself, corroding before the base material, offering added corrosion resistance.

Technical Data

Governing StandardsGrade 8

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 8 Marking

Mechanical PropertiesGrade 8

Carbon Alloy Steel, Quenched & Tempered		Per SAE J995 2017-07
Diameter	Proof Load Stress (1)	Core Hardness
Diameter	psi	Rockwell
1/4 thru 5/8"	150,000	C24-C32
Over 5/8 thru 1"	150,000	C26-C34
Over 1 thru 1 1/2"	150,000	C26-C36

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. (both tables available in SAE J995 2017-07 standard) 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 8

Per SAE J995 2017-07
Grade	Material	Carbon	Manganese	Phosphorus	Sulfur
Grade	Material	% by weight	% by weight	% by weight	% by weight
8	Carbon Alloy Steel, Quenched & Tempered	0.55 max	0.30 min	0.04	0.05 (1)

1. If agreed between purchaser and producer, sulfur content may be 0.33 maximum provided that manganese content is 1.35 minimum.

Dimensional SpecificationsGrade 8

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 8 Hex Nut, Plated

of 1

Sort By

Show

View

Diameter	Thread Pitch	Width Across Flats	Height of Nut	Item #	Availability	Price	Quantity
1/4	20	7/16	0.2187	NF8P0250000	In Stock	$0.04148/EA	EA	EA
1/4	28	7/16	0.2187	NF8P025NF00	In Stock	$0.05287/EA	EA	EA
5/16	18	1/2	0.2656	NF8P0310000	In Stock	$0.06163/EA	EA	EA
5/16	24	1/2	0.2656	NF8P031NF00	In Stock	$0.14487/EA	EA	EA
3/8	16	9/16	0.3281	NF8P0370000	In Stock	$0.07515/EA	EA	EA
3/8	24	9/16	0.3281	NF8P037NF00	In Stock	$0.08803/EA	EA	EA
7/16	14	11/16	0.3750	NF8P0430000	3-5 Working Days	$0.14844/EA	EA	EA
7/16	20	11/16	0.3750	NF8P043NF00	In Stock	$0.14176/EA	EA	EA
1/2	13	3/4	0.4375	NF8P0500000	In Stock	$0.15492/EA	EA	EA
1/2	20	3/4	0.4375	NF8P050NF00	In Stock	$0.28091/EA	EA	EA
9/16	12	7/8	0.4843	NF8P0560000	In Stock	$0.27047/EA	EA	EA
9/16	18	7/8	0.4843	NF8P056NF00	In Stock	$0.23303/EA	EA	EA
5/8	11	15/16	0.5468	NF8P0620000	In Stock	$0.32276/EA	EA	EA
5/8	18	15/16	0.5468	NF8P062NF00	In Stock	$0.36339/EA	EA	EA
3/4	10	1 1/8	0.6406	NF8P0750000	In Stock	$0.53241/EA	EA	EA
3/4	16	1 1/8	0.6406	NF8P075NF00	In Stock	$0.92491/EA	EA	EA
7/8	9	1 5/16	0.75	NF8P0870000	In Stock	$0.91576/EA	EA	EA
7/8	14	1 5/16	0.75	NF8P087NF00	In Stock	$1.01431/EA	EA	EA
1	8	1 1/2	0.8593	NF8P1000000	In Stock	$1.17552/EA	EA	EA
1	14	1 1/2	0.8593	NF8P100NF00	In Stock	$1.44962/EA	EA	EA
1 1/8	7	11/16	0.9687	NF8P1120000	In Stock	$2.27742/EA	EA	EA
1 1/8	12	11/16	0.9687	NF8P112NF00	In Stock	$2.42399/EA	EA	EA
1 1/4	7	1 7/8	1.0625	NF8P1250000	In Stock	$3.14536/EA	EA	EA
1 1/4	12	1 7/8	1.0625	NF8P125NF00	In Stock	$3.40937/EA	EA	EA
1 3/8	6	2 1/16	1.6875	NF8P1370000	In Stock	$3.27854/EA	EA	EA
1 3/8	12	2 1/16	1.6875	NF8P137NF00	In Stock	$3.36037/EA	EA	EA
1 1/2	6	2 1/4	1.2812	NF8P1500000	In Stock	$6.49569/EA	EA	EA
1 1/2	12	2 1/4	1.2812	NF8P150NF00	In Stock	$9.68973/EA	EA	EA

Grade 8 Hex Nut, Plated

Technical Data

Tab 1

Governing StandardsGrade 8

Tab 2

Mechanical PropertiesGrade 8

Tab 3

Chemical PropertiesGrade 8

Tab 4

Dimensional SpecificationsGrade 8

Product Specification

Grade

Diameter

Thread Pitch

Thread Type

Width Across Flats