Unit of Measure


Dimension Drawing

UN-A-Lock Bushing (UL Type)

I.D. (A)

N/A 3/16 in

I.D. (A)1

N/A 0.1876 to 0.1879

O.D. (B)

N/A 5/16 in

O.D. (B)1

N/A 0.3138 in0.3141 in

Length (C)

N/A 1/2 in

ANSI Symbol No.

N/A UL20-8


N/A 1/4 in


N/A 3/8 in

Price Code No.

N/A 1274

Actek Manufacturer Number

N/A AKUL20-8


N/A UN-A-Lock Bushing (UL Type)



    Features :

    1. Full Radius on I.D. for Proper Entry Alignment, Preventing Wear and Breakage of tool.
    2. Double Chamfered Head.
    3. Two Way Undercut Allows Bushing to Sit Flush on top of Jig.
    4. Internally Ground Diameters insure Straightness.
    5. 45° Lead for Easy Entry into Jig.
    6. Additional Concentric Ground Lead for Proper initial Alignment and Easy Entry.
    7. Stamped with Size and Trademark for your Protection.
    8. Slip Renewable Bushing Heads Knurled for Speed in Removal and Replacement.

    Suggestions for installation :

    1. Avoid Excessive interference Fit.
    2. Before installing Lubricate Mounting Hole and O.D. of The Bushing.
    3. Install Bushings with an Arbor Press Whenever Possible.
    4. Prepare Mounting Holes Carefully.
    Technical information :

      Material : C1144
      Heat Treat : Case Hardened
      Hardness : Rockwell C61-65 in The Hole

      Concentricity :
      I.D. Range of 1/8" to 1/2" Tir. is Hold to 0.0003
      I.D. Smaller Than 1/8" Tir. is Hold to 0.0005
      I.D. Larger Than 1/2" Tir. is Hold to 0.0005

      Reamer Bushings Tolerance :
      I.D. Up to 1/4" is +0.0005 to +0.0008
      I.D. 1/4" to 1" is +0.0006 to +0.0010
      I.D. Over 1" is +0.0008 to +0.0012