# Prime-Line 5/16 in.-18 A563 Grade A Zinc Plated Steel Hex Jam Nuts (100-Pack)

**Brand:** [Prime-Line](https://shop.coreranger.com/brands/Prime-Line)
**SKU:** 9075866
**Price:** $9.92 · in stock
**URL:** https://shop.coreranger.com/product/prime-line-5-16-in-18-a563-grade-a-zinc-plated-steel-hex-jam-nuts-100-pack-310552897

## Specifications

| Spec | Value |
|---|---|
| Grade | A563 |
| Model # | 9075866 |
| Internet # | 310552897 |
| Returnable | 90-Day |
| Store SKU # | 1004569019 |
| Thread Style | Coarse Thread |
| Fastener Type | Jam Nut |
| Finish Family | Zinc |
| Fits Bolt Size | 5/16 inch |
| Fastener Plating | Uncoated |
| Outside Diameter | 13/32 in |
| Package Quantity | 100 |
| Fastener Material | Carbon Steel |
| Thread Pitch (mm) | N/A - Inches Fastener |
| Measurement System | Inches |
| Product Weight (lb.) | 0.01 lb |
| Fastener Callout Size | 5/16 in. |
| Threads Per Inch (TPI) | 18 TPI |

## Description

The term "jam nut" comes from its use as a secondary nut that jams the main nut. Jam nuts help to prevent loosening in cases where the bolt may be subject to vibration. In situations where you need to fasten a threaded rod or hanger bolt, a jam nut can be tightened against a regular nut in order to create a place for a wrench to be used. They can also take the place of a standard nut in cases where there is not enough exposed thread to support the thickness of a standard nut.