Gibraltar TN-21SS-G T-slot Nut Blind Tapped 1/2-13

Product Description

The GIBRALTAR TN-21SS-G is a blind tapped T-slot nut designed for securing workpieces and fixtures in T-slot extrusions and machine tables. The nut features a 1/2-13 right-hand thread with a blind tap, meaning the threaded hole does not pass all the way through the body. This design keeps chips and debris out of the thread, making it well suited for machining environments. Constructed from 304 stainless steel with a black oxide finish, it provides corrosion resistance alongside a hardened surface treatment. The base measures 1.125 inches wide by 0.406 inches tall, and the overall length is 1.25 inches with an overall height of 0.75 inches. Machinists, tool and die makers, and CNC setup technicians install this hardware during fixturing and workholding operations.

This T-slot nut fits 11/16-inch wide T-slots, which is a common slot size found on milling machine tables, modular fixturing systems, and aluminum extrusion platforms. It is suited for both production shop and job shop environments where stainless steel hardware is required to resist coolant, cutting fluid, and general corrosion exposure. The blind tapped configuration makes it a preferred choice in setups where through-hole fasteners are not acceptable and where maintaining a clean thread during repeated use is important.

Key Features

• Blind tapped 1/2-13 right-hand thread keeps debris out of thread bore
• 304 stainless steel construction for corrosion resistance in wet machining environments
• Black oxide finish provides additional surface protection
• Fits 11/16-inch wide T-slots for compatibility with common milling and fixturing tables
• Base width of 1.125 inches provides stable seating within the slot channel
• Inch measurement system with standard 1/2-13 UNC threading for broad fastener compatibility

Compatibility

Designed for use in T-slot extrusions and machine table channels with an 11/16-inch slot width. No specific model compatibility data was provided by the manufacturer for this part.

Installation Notes

This nut is installed by machinists and fixture technicians during workholding setup on milling machines or modular fixturing systems. Slide the nut into the T-slot channel from the end or through an access point before positioning the workpiece. Ensure the slot width matches the nut base dimensions before installation to prevent binding or improper seating. Do not force the nut into undersized slots, as this can damage both the nut body and the slot channel.