Head Liner Bushings

Head Liners  are similar to L bushings, but with a head to resist heavy axial loads. HL liners are permanent bushings used to hold renewable drill bushings. The liner's ID has a precise sliding fit with the renewable bushing's OD. The liner accurately locates the renewable bushing and protects the jig plate from wear and damage caused by frequent bushing replacement.

Application Information

Head Liners are permanent bushings used to hold renewable drill bushings. The head provides resistance to axial loads, and is usually recessed in the plate.

ID Tolerance

Standard Liner ID Tolerance:

• 3/16 to 3/8" +0.0001/+0.0004
• 7/16 to 5/8" +0.0002/+0.0005
• 3/4" +0.0003/+0.0006
• 7/8 to 1" +0.0004/+0.0007
• 1-3/8" +0.0006/+0.0010
• 1-3/4" +0.0008/+0.0012
• 2-1/4 and up +0.0010/+0.0015

OD Tolerance

Standard OD Tolerance:

• 1/2" +0.0017/+0.0014
• 3/4 to 1" +0.0018/+0.0015
• 1-3/8" +0.0022/+0.0018
• 1-3/4" +0.0023/+0.0019
• 2-1/4 to 2-3/4" +0.0025/+0.0021
• 3 to 4" +0.0028/+0.0023

Unground OD Tolerance:

• 1/2 to 2-1/4" +0.020/+0.015

Material

Parts Specification