Description
Monster Overview:
Bulk 3/8-16 Indented Hex-Washer Head Taptite Alternative Thread-Rolling Screws from Monster Bolts pair a high-torque hex drive with an integrated washer that spreads load and protects finishes. Forged from hardened 410 stainless steel (martensitic, magnetic), these trilobular fasteners roll-form durable, reusable threads in untapped holes—slashing assembly time while delivering outstanding strength and vibration resistance in aluminum, mild steel, brass, and plastics.
The metal is passivated & wax-coated for a clean surface, added lubricity, and RoHS-compliant corrosion protection. Perfect for heavy equipment, truck bodies, HVAC frames, and general-fabrication builds that demand stainless durability plus a secure flange-style head.
Monster Features:
- High-Strength 410 SS: Heat-treated martensitic stainless outperforms 18-8 in hardness and tensile strength.
- Thread-Rolling Efficiency: Creates internal threads in one step—no pre-tapping, chips, or secondary operations.
- Indented Hex-Washer Head: Hex-washer (flange hex) drive spreads load without a separate washer.
- Vibration Resistance: Interference fit and work-hardened threads keep joints tight under dynamic loads.
- Lower Drive Torque: Trilobular profile and wax top-coat cut friction for faster installs.
Monster Specifications
| Feature | Details |
|---|---|
| Diameter / Thread | 3/8-16 UNC |
| Available Lengths | Fully threaded — select length above |
| Head / Drive | Indented Hex-Washer (flange hex) |
| Point Style | Taptite-style trilobular thread-rolling |
| Material | 410 Stainless Steel (martensitic, magnetic) |
| Finish | Passivated + Wax (RoHS) |
| System of Measurement | US / Inch |
| Standards | Meets ASME B18.6.3 & IFI thread-rolling screw guidelines |
Also called hex-washer head, indented hex screw, or flange-hex screw, this drive style supplies high torque with a built-in washer—no separate hardware required.
More Monster Bolts:
Explore More Thread-Forming Options: Need other sizes or head styles? Browse our full Thread-Forming Screw Collection.
Need matching hardware? Bulk 3/8″ washers available here.
Order Yours Today and Experience the Monster Bolts Difference!
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Note: (PT) denotes partial-thread fasteners; all lengths in this listing are full-thread.