Aloris Series ATB Internal Threading Bar Left Hand ATB-5L

The Aloris ATB-5L Internal Threading Bar is engineered for left-hand internal threading operations with unmatched rigidity, precision, and repeatability. Designed to accommodate triangular throw-away threading inserts seated in a hardened shim (Shim YI4-LH), this bar delivers reliable performance for demanding CNC or manual lathe applications.

The shank features three precision-ground flat sides, making it ideal for Aloris Boring Bar Holders #1, #2, #4, #13, and #41. This design ensures secure clamping, minimizes vibration, and maintains cutting accuracy across repeated cycles. Whether you’re threading to a shoulder or cutting long internal threads, the ATB-5L is a dependable solution built to Aloris’ exacting standards.

• Threading Direction: Left-hand internal threading

• Insert Style: 60° Carbide Threading Inserts 1/2 AIT-L60 (Not Included)

• Recommended Shim: YI4-LH

• Material: Hardened steel body for long life and durability

• Ideal For: CNC machines, precision manual lathes, and jig bores

Dimensions (see image):
A: 1⁷/₁₆“; B: 3¹/₈“; C: 1¹/₄“; D: 1¹/₂“; L: 14″; I.C.: ¹/₂”

Replacement Parts:
✅Insert Screw ASA4T
✅Key T-20
✅Shim YE4(LH)
✅60° Carbide Threading Inserts 1/2 AIT-L60