Allied 250Z0S-075L Indexable Spade Drill 7/16-1/2 in

Product Description

The ALLIED MACHINE AND ENGINEERING 250Z0S-075L is an indexable spade drill designed for precision hole-making in a wide range of workpiece materials. Built on the T-A Z Series platform, this drill accepts replaceable spade blade inserts, eliminating the need to regrind tooling and reducing downtime between jobs. It features a straight flute geometry and through-coolant capability, with coolant delivered via an axial concentric entry threaded 1/8 inch NPT. The 3/4-inch flatted cylindrical shank provides secure seating in standard drill holders. Overall length is 7-17/32 inches, and the body is constructed from steel for durability under production conditions. Machinists and toolroom professionals working in job shops and manufacturing environments rely on this platform for consistent, repeatable results across extended drilling depths.

The 250Z0S-075L is rated for general-purpose drilling with a working diameter range of 7/16 to 1/2 inch and a maximum drill depth of 4-3/8 inches. The extended-length configuration suits applications where standard-length drills cannot reach, including deep-bore work in steel, aluminum, cast iron, nonferrous alloys, and high-temperature superalloys. Its universal workpiece material classification covers material codes H, K, M, N, P, and S, making it a versatile choice for multi-material production environments.

Key Features

• Diameter range 7/16 to 1/2 inch with a maximum drilling depth of 4-3/8 inches
• Through-coolant design with 1/8 inch NPT axial concentric coolant entry for chip evacuation and heat control
• Extended-length body at 5-5/32 inches supports deep-bore applications
• Flatted cylindrical shank at 3/4 inch diameter prevents slippage in the holder
• Straight flute geometry suited for general-purpose drilling in diverse materials
• Indexable insert system eliminates regrinding and reduces per-hole tooling cost

Compatibility

Designed for use with T-A Z Series indexable spade blade inserts compatible with 3/4 inch shank holders. Rated for universal workpiece materials including material codes H, K, M, N, P, and S covering steels, cast irons, nonferrous metals, and high-temperature alloys.

Installation Notes

Installation and tooling changes should be performed by a qualified machinist with the machine powered down and locked out per applicable safety procedures. Secure the flatted shank firmly in the drill holder to the tool manufacturer torque guidelines for the holder in use. Verify coolant supply connection at the 1/8 inch NPT port is leak-free before initiating a cut. Inspect the spade blade insert for seating and condition before each production run.