5/16"-18 x 2" Yellow Zinc Hex Head Cap Screw Grade 8
Grade 8 Hex Head Cap Screws are manufactured from medium carbon alloy steel that has been quenched and tempered for strength. Grade 8 is the highest grade offering of the SAE J429 classification with a minimum tensile strength exceeding that of Gr.5 by 25% to over 40%, depending on the diameter. Grade 8 HHCS are commonly used in heavy construction equipment, commercial vehicles and applications that demand a high strength fastener. Hex Head Cap screws feature an integral washer face under the head for a smooth bearing surface and a chamfered thread at the tip to allow for ease of assembly. They can be used in a threaded hole or mated with a nut in a through bolting application. Grade 8 bolts are identified by a head marking with 6 radial lines evenly spaced 60 degrees apart. They meet the material specification SAE J429 Grade 8 and can be supplied either in a plain finish or with a Zinc Yellow (Dichromate) plating with a chromate secondary layer that offers additional protection from corrosion and has an attractive yellow/gold appearance.
| Manufacturer | KL Jack Quality Vendor |
| Item Type | Hex Cap Screw - Inch |
| System of Measurement | Inch |
| Drive Type | Hex |
| Diameter | 5/16" |
| Length (inches) | 2" |
| Finish | Yellow Zinc |
| Grade | 8 |
| Hardness RC | 33-39 HRC |
| Head Height | 0.195" min / 0.211" max |
| Head Style | Hex |
| Hex Size | 1/2" |
| Material | Steel |
| Proof Stress | 120,000 PSI |
| RoHS Compliant | No |
| Dimensional Specification | ASME B18.2.1 |
| Finish Specification | ASTM F1941 Fe/Zn |
| Material Specification | SAE J429 |
| Thread Specification | ASME B1.1, UNC, Class 2A |
| Supplier Part Number | 13553 |
| Tensile Strength | 150,000 PSI |
| Thread Length | 7/8" |
| Threads Per Inch | 18 |
| Thread Style | Partial Thread |
| Thread Type | Coarse |
| Suggested Installation Torque | 22 lb-ft. (Value for Zinc Plated Threads) |
| Yield Strength | 130,000 PSI |
31C200HCS8Z
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EXTRAS
Extras
The following products are meant to be used or paired with the product above.
 |
Stainless Steel U-Bolt Kit (4 mounts) |  |
 |
4 or 6 Point Deck Plate Mounting Kit | |
 |
Life-Time Galvanized 4 Tube Kit | |
Still looking for the perfect part? Having trouble finding it?
Call our product experts at 603-224-7370 and let us lend a hand.
