Description
Monster Overview
Drive, tap and clamp in one motion. 5/16″-18 Slotted Hex-Washer Thread-Cutting Screws deliver bolt-level holding power without a backing nut—ideal for marine panels, food-grade frames, trailer skins, HVAC cabinets and hardwood-to-steel joins. Made from corrosion-proof 18-8 stainless steel, then passivated and coated with a factory dry-wax film to ensure low, repeatable seating torque. The indented hex head with integral washer spreads load and covers oversize holes, while a wide flat-blade slot provides a back-up drive in tight spots. A Type F fluted point taps clean internal threads in a pre-drilled or punched hole; chips exit through the flute—no chip clean-up, welds or nuts.
Monster Features
- Dual-Drive Head: Indented 5/16″ hex (½″ wrench) plus broad slot—socket, impact gun or flat driver.
- Integrated Washer: Enlarged bearing surface resists pull-through and helps seal joints in thin sheet metal.
- Type F Cutting Point: UNC machine thread with fluted slot—forms threads in 0.060–0.200″ steel plate or dense hardwood; chips exit cleanly.
- Material Edge: 18-8 stainless offers excellent corrosion resistance—ideal for outdoor or food-service environments.
- Finish & Lube: Passivated surface + factory dry-wax (silicone-free) for consistent clamp load.
- Bulk Packaging: Factory-sealed master cartons—perfect for stainless fabrication, dock builders & trailer shops.
Monster Specifications
- Diameter / Thread: 5/16″-18 UNC — Type F cutting point (fully threaded)
- Lengths Offered: ¾″ (0.750 in.) & 1″ (1.000 in.)
- Head Style: Slotted indented hex-washer (½″ wrench)
- Drive Methods: External hex • flat-blade screwdriver
- Material: 18-8 stainless steel, passivated
- Lubricant: Factory dry-wax film
- Standards: SAE J476 Type F • IFI 136
More Monster Bolts
• Browse the complete
Type F thread-cutting lineup
• Need thread-formers? Check our
PT / Plastite collection
Order Yours Today & Feel the Monster Difference!
Every bulk carton ships quickly from our U.S. warehouse and is backed by the Monster Bolts quality guarantee and responsive support.