Stewart Fastener J1248ASHZ Hex Washer Head Tapping Screw

Product Description

The STEWART FASTENER J1248ASHZ is a No. 12 x 3 inch hex washer head Type A tapping screw with a zinc plated finish, sold in a jar of 100 pieces. Type A tapping screws are self-threading fasteners designed to cut their own threads in thin sheet metal, soft metals, resin board, and similar materials. The hex washer head style provides a large bearing surface that resists pull-through while allowing fast driving with a standard hex socket or nut driver. Zinc plating delivers basic corrosion resistance for general indoor and light-duty applications. This jar-pack format is well suited to shop inventory, service vans, and jobsite bins.

These screws are a common choice for HVAC sheet metal fabrication and equipment panel assembly, light-gauge ductwork attachment, electrical enclosure assembly, and general sheet metal work across residential and commercial trades. The No. 12 diameter and 3 inch length target applications where a longer grip is needed through stacked material or light structural members. Licensed sheet metal workers, HVAC technicians, electricians, and general contractors regularly stock this size for production and service work.

Key Features

• Type A thread-forming point self-taps into sheet metal and soft substrates without pre-tapping
• Hex washer head provides high bearing surface area and reduces pull-through risk
• No. 12 x 3 inch size covers thicker or stacked material applications
• Zinc plating provides corrosion resistance for general-use environments
• Jar of 100 pieces supports bench stock and mobile service inventory

Compatibility

Designed as a standard Type A hex washer head tapping screw for use in light-gauge sheet metal, resin board, and similar materials where a self-threading fastener is required.

Installation Notes

Installation is performed with a hex socket driver or nut driver sized to the hex washer head. Confirm base material thickness and hardness are within the rated range for Type A tapping screws before driving. Do not over-torque, as over-driving can strip the tapped thread in thin sheet stock. Follow applicable codes and manufacturer guidelines for fastener spacing in ductwork and panel assemblies.

Technical Specifications

• Thread Size: No. 12
• Length: 3 inches
• Head Style: Hex Washer Head
• Thread Type: Type A Tapping
• Finish: Zinc Plated
• Quantity per Package: 100 pieces (jar)

Standard Information

• Brand: STEWART FASTENER
• Manufacturer Part Number: J1248ASHZ