Grade 8 Hex Nut, Plated
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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.

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
Grade 8 Marking

Mechanical PropertiesGrade 8

Carbon Alloy Steel, Quenched & Tempered Per SAE J995 2017-07
Diameter Proof Load Stress (1) Core Hardness
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. 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
% 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. 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

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 8 Hex Nut, Plated
View
Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM
1/4 20 7/16 0.2187 NF8P0250000 In Stock $0.04253/EA EA
1/4 28 7/16 0.2187 NF8P025NF00 In Stock $0.05287/EA EA
5/16 18 1/2 0.2656 NF8P0310000 In Stock $0.06334/EA EA
5/16 24 1/2 0.2656 NF8P031NF00 In Stock $0.17/EA EA
3/8 16 9/16 0.3281 NF8P0370000 In Stock $0.07619/EA EA
3/8 24 9/16 0.3281 NF8P037NF00 In Stock $0.08803/EA EA
7/16 14 11/16 0.3750 NF8P0430000 In Stock $0.14016/EA EA
7/16 20 11/16 0.3750 NF8P043NF00 In Stock $0.14172/EA EA
1/2 13 3/4 0.4375 NF8P0500000 In Stock $0.16555/EA EA
1/2 20 3/4 0.4375 NF8P050NF00 In Stock $0.28303/EA EA
9/16 12 7/8 0.4843 NF8P0560000 In Stock $0.27131/EA EA
9/16 18 7/8 0.4843 NF8P056NF00 In Stock $0.23303/EA EA
5/8 11 15/16 0.5468 NF8P0620000 In Stock $0.37601/EA EA
5/8 18 15/16 0.5468 NF8P062NF00 In Stock $0.37017/EA EA
3/4 10 1 1/8 0.6406 NF8P0750000 In Stock $0.60535/EA EA
3/4 16 1 1/8 0.6406 NF8P075NF00 In Stock $0.84308/EA EA
7/8 9 1 5/16 0.75 NF8P0870000 In Stock $0.93333/EA EA
7/8 14 1 5/16 0.75 NF8P087NF00 In Stock $1.01431/EA EA
1 8 1 1/2 0.8593 NF8P1000000 In Stock $1.18939/EA EA
1 14 1 1/2 0.8593 NF8P100NF00 In Stock $1.66015/EA EA
1 1/8 7 11/16 0.9687 NF8P1120000 In Stock $2.24603/EA EA
1 1/8 12 11/16 0.9687 NF8P112NF00 In Stock $2.42399/EA EA
1 1/4 7 1 7/8 1.0625 NF8P1250000 In Stock $2.97144/EA EA
1 1/4 12 1 7/8 1.0625 NF8P125NF00 In Stock $3.40937/EA EA
1 3/8 6 2 1/16 1.6875 NF8P1370000 In Stock $3.27854/EA EA
1 3/8 12 2 1/16 1.6875 NF8P137NF00 In Stock $3.37045/EA EA
1 1/2 6 2 1/4 1.2812 NF8P1500000 In Stock $6.46533/EA EA
1 1/2 12 2 1/4 1.2812 NF8P150NF00 In Stock $9.68973/EA EA