Aloris Series ATB Internal Threading Bar Left Hand ATB-1L

The Aloris ATB-1L Internal Threading Bar is purpose-built for Left-Hand Internal Threading applications, offering exceptional stability, precision, and ease of use. Unlike other threading bars, the ATB-1L is engineered to operate without a shim, making setup faster and more straightforward while still maintaining tight tolerances and repeatable accuracy.

This bar holds triangular throw-away threading inserts in a hardened pocket, delivering reliable performance for a wide range of materials. Its three-flat-side shank is designed for maximum compatibility with Aloris Boring Bar Holders #1, #2, #4, #13, and #41, ensuring a rigid, anti-vibration grip during cutting.

Ideal for both CNC lathes and manual operations, the ATB-1L combines Aloris quality with operator convenience—making it a go-to tool for machinists seeking efficiency and control.

• Threading Direction: Left-hand internal threading

• Insert Style: 60° Carbide Threading Inserts 1/4 AIT-L60 (Not Included)

• Shim Required: None

• Shank Compatibility: Aloris Boring Bar Holders (#1, #2, #4, #13, #41)

• Application: CNC & precision manual lathes

Dimensions (see image):
A: ¹/₂“; B: ⁷/₈“; C: ⁵/₈“; D: ³/₄“; L: 6¹/₂“; I.C.: ¹/₄”

Replacement Parts:
✅Insert Screw ASA2T
✅Key T8
✅60° Carbide Threading Inserts 1/4 AIT-L60