Product Description
Amarillo Bolt 5/16″ × 4″ UNC Hex Bolt, Grade 5, Zinc (CB5‑516‑4)
The Amarillo Bolt CB5‑516‑4 is a Grade 5 medium-carbon steel hex-head bolt featuring a 5/16″ diameter, 18 TPI UNC threading, and a 4″ length under the head. Finished with zinc plating, it offers corrosion resistance and reliable fastening for machinery, structural, industrial, agricultural, and general-purpose applications.
Key Features
- 5/16″ × 4″ under-head length, 18 TPI UNC coarse thread
- Grade 5 medium-carbon steel, heat-treated per SAE J429
- Zinc finish for enhanced corrosion resistance
- Thread marking: Three radial lines, wrench size 1/2″
- Proof load ~85,000 psi; Tensionle strength ~120,000 psi
- Recommended torque (unplated 23 ft·lb, plated 17 ft·lb, lubricated 14 ft·lb)
Specifications
| Specification | Details |
|---|---|
| Brand | Amarillo Bolt |
| Part Number | CB5‑516‑4 |
| Diameter | 5/16″ |
| Length | 4″ (under-head) |
| Thread Pitch | 18 TPI (UNC) |
| Material | Grade 5 Medium‑Carbon Steel (SAE J429/ASTM A449) |
| Finish | Zinc-Plated |
| Proof Load | ~85 ksi |
| Tensionle Strength | ~120 ksi |
| Rockwell Hardness | C25–C34 |
| Wrench Size | 1/2″ |
| Recommended Torque | Unplated 23 ft·lb • Plated 17 ft·lb • Lubricated 14 ft·lb |
| UPC | Not listed |
| Estimated Shipping Dimensions | ~4.5″ × 0.5″ × 0.5″ |
| Estimated Shipping Weight | ~0.31 lb (~5 oz) |
Applications
- Automotive and mechanical assemblies
- Structural and industrial fastening
- Agricultural and general maintenance use
Notes
- Specifications sourced from Amarillo Bolt's public page :contentReference[oaicite:1]{index=1}
- Packaging estimates reflect single-piece shipment
- Complies with SAE J429 and ASTM A449 standards
Warning
- Wear gloves and eye protection during installation. Verify torque values for specific applications.
