Grade 5 Hex Nut, Plated
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Grade 5 Hex Nut, Plated

SAE J995 Grade 5 hex nuts are medium strength nuts manufactured from quenched and tempered medium carbon steel. Grade 5 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 120 degrees apart and the manufacturer's identification mark. Grade 5 hex nuts are commonly used on Grade 5 bolts. Available in zinc plated finish. Zinc plating sacrifices itself, corroding before the base material, offering added corrosion resistance.

Governing StandardsGrade 5

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 5 Marking
Grade 5 Marking

Mechanical PropertiesGrade 5

Medium Carbon Steel Per SAE J995 2017-07
Diameter Proof Load Stress (1) Core Hardness
psi Rockwell
1/4 thru 1" UNC & 8UN 120,000 C32 Max
1/4 thru 1" UNF, 12UN and Finer 109,000 C32 Max
Over 1 thru 1 1/2" UNC & 8UN 105,000 C32 Max
Over 1 thru 1 1/2" UNF, 12UN and Finer 94,000 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. (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 5

Per SAE J995 2017-07
Grade Material Carbon Manganese Phosphorus Sulfur
% by weight % by weight % by weight % by weight
5 Medium Carbon Steel 0.55 max 0.30 min 0.05 max (1)(2) 0.15 max (2)(3)
  1. 1. Phosphorus content may be 0.13 maximum for acid bessemer steel only.
  2. 2. If agreed between purchaser and producer, sulfur content may be 0.35 maximum and phosphorus content may be 0.12 maximum provided that manganese content is 0.70 minimum.
  3. 3. If agreed between purchaser and producer, sulfur content may be 0.23 maximum.

Dimensional SpecificationsGrade 5

Finished bolt and cap screw 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 5 Hex Nut, Plated
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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 NF5P0250000 In Stock $0.02662/EA EA
5/16 18 1/2 0.2656 NF5P0310000 In Stock $0.03976/EA EA
3/8 16 9/16 0.3281 NF5P0370000 In Stock $0.05987/EA EA
7/16 14 11/16 0.3750 NF5P0430000 In Stock $0.09762/EA EA
1/2 13 3/4 0.4375 NF5P0500000 In Stock $0.14647/EA EA
9/16 12 7/8 0.4844 NF5P0560000 In Stock $0.2995/EA EA
5/8 11 15/16 0.5469 NF5P0620000 In Stock $0.29233/EA EA
3/4 10 1 1/8 0.6406 NF5P0750000 In Stock $0.43846/EA EA
7/8 9 1 5/16 0.75 NF5P0870000 In Stock $0.67173/EA EA
1 8 1 1/2 0.8594 NF5P1000000 In Stock $1.14691/EA EA
1 1/8 7 11/16 0.9688 NF5P1120000 In Stock $1.09718/EA EA
1 1/4 7 1 7/8 1.0625 NF5P1250000 In Stock $1.86946/EA EA