Grade 8 Hex Nut, Plated
Grade 8 Hex Nut, Plated
Manufacturers:
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.
Products
Governing Standards
| 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 Properties
| 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. 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 Properties
| 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. If agreed between purchaser and producer, sulfur content may be 0.33 maximum provided that manganese content is 1.35 minimum.
Dimensional Specifications
| 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.