Description
Monster Overview:
When precision and strength matter, choose Bulk #4-48 Button Head Socket Cap Screws from Monster Bolts. These fasteners are crafted from high-strength ASTM A574 alloy steel and finished with a thermal black oxide + oil coating for a professional matte appearance and mild corrosion resistance. The button head profile provides a smooth, low-profile look that’s perfect for precision assemblies and applications with limited clearance.
Each screw meets ASME B18.3 and IFI-111 standards to ensure dimensional consistency and reliable performance. All Monster Bolts black oxide socket fasteners are fully RoHS compliant and ship directly from our U.S. warehouse for fast, reliable delivery.
Key Features:
- High Strength: Manufactured from ASTM A574 alloy steel with ~180,000 psi tensile and 162,000 psi yield strength (≤ 1/2" diameter).
- Button Head Design: Rounded, low-profile head minimizes snag risk and provides a clean, finished appearance.
- Drive: Uses a standard 1/16" hex key for secure torque transfer. Available here if you need a fresh one!
- Finish: Thermal black oxide + oil for a sleek look and mild oxidation resistance.
- Compliance: Meets ASME B18.3 / IFI-111 standards, material conforms to ASTM A574, and is fully RoHS compliant.
Monster Specifications:
| Specification | Detail |
|---|---|
| Diameter / Thread Size | #4-48 (UNF – Unified Fine Thread) |
| Drive Size | 1/16" Hex Key (Allen Wrench) |
| Material | Alloy Steel per ASTM A574 (≈ Class 12.9 Equivalent) |
| Finish | Thermal Black Oxide + Oil |
| Tensile Strength | 180,000 psi (≤ 1/2" Diameter) |
| Yield Strength | 162,000 psi (≤ 1/2" Diameter) |
| Hardness | Rockwell C39 Minimum |
| Standards | ASME B18.3 / IFI-111 / ASTM A574 |
| RoHS Compliance | Yes – Black Oxide Finish |
Measurement Note:
For button head socket cap screws, overall length is measured from under the head to the tip of the screw.
Matching Products:
- Matching Nuts: Compatible #4-48 nuts available in our Bulk U.S. Nuts Collection.
- Matching Washers: Pair with flat and lock washers from our Bulk U.S. Washers Collection.
- Hex Key: Uses a 1/16" hex key – Available here.
Order with Confidence:
Every Monster Bolts bulk order ships fast from our U.S. warehouse and is backed by our dedication to quality, consistency, and customer satisfaction. Trusted by engineers, builders, and maintenance professionals nationwide.