Malco BT131-1M Hex Washer Bit-tip Screw 8x1/2 in 18TPI 1000pk

Product Description

The MALCO BT131-1M is a hex washer head, bit-tip sheet metal screw designed for fast, clean fastening in HVAC ductwork, metal framing, and light-gauge steel fabrication. Measuring 8 x 0.5 inches with 18 threads per inch (TPI), this screw features a No. 2 drill point that simultaneously drills a pilot hole and drives the fastener in a single operation. The shank is cold forged from heat-treated steel for consistent thread geometry and drill point contour. The 0.25-inch hex drive is compatible with standard bit holders and impact drivers. Sold in a bulk pack of 1000 units.

This screw is suited for residential and commercial HVAC duct assembly, sheet metal enclosures, equipment panels, and mechanical room fabrication. The bit-tip design produces an optimum hole size for tight thread engagement without a separate drill bit or pilot step. Its short 0.5-inch length makes it appropriate for thin-gauge steel joining where minimal penetration is required. HVAC installers, sheet metal workers, and mechanical contractors are the primary users of this fastener in both new construction and retrofit applications.

Key Features

• Bit-tip point drills and fastens in one step, eliminating need for separate drill bits
• Cold forged construction ensures uniform thread dimensions and drill point contour
• Heat-treated steel for added hardness and durability in metal-to-metal applications
• Hex washer head distributes clamping load and resists pull-through
• 0.25-inch hex drive is compatible with standard power drivers and bit holders
• Lifetime limited warranty per manufacturer

Compatibility

Designed as an OEM-style replacement and general-use fastener for light-gauge sheet metal applications typical in HVAC ductwork assembly and metal panel fabrication.

Installation Notes

Installation is performed by HVAC technicians and sheet metal workers using a power driver or impact driver with a 0.25-inch hex bit holder. No pre-drilling is required when used within the rated gauge range for the No. 2 drill point. Ensure the substrate material and gauge are appropriate for the fastener length before driving. Follow applicable mechanical and sheet metal codes for fastener spacing and joint requirements.

Technical Specifications

• Nominal Diameter: No. 8
• Length: 0.5 inches
• Threads Per Inch (TPI): 18
• Drive Style: 0.25-inch Hex
• Head Style: Hex Washer
• Drill Point Size: No. 2
• Material: Steel
• Process: Heat Treated
• Quantity: 1000 per bulk pack
• Warranty: Lifetime Limited

Standard Information

• Brand: MALCO
• Manufacturer Part Number: BT131-1M