Thread Cutting Lead Angle Calculator

Lead Angle Calculator for Laydown (LT) Shims


! These calculations are based upon theoretical values and are only intended for planning purposes. Actual results will vary. No responsibility from Kennametal is assumed.

Enter Parameters          

    Nominal diameter:     in
    Threads per inch:  
    Number of starts:  

    

Your Results

Lead angle:   °

Selection of SHIMs

 hand of thread
hand of hold / insert
feed direction towards the chuck (standard helix)
To determine catalog number replace (*) asterisk with the number 3 or 4. (3 = 3/8 I.C. or 4 = 1/2 I.C.)
0° to 1° = SMYI*1N
1° to 2° = SMYI*
2° to 3° = SMYI*1P
3° to 4° = SMYI*2P
 0° to 1° = SMYE*1N
1° to 2° = SMYE*
2° to 3° = SMYE*1P
3° to 4° = SMYE*2P
 0° to 1° = SMYE*1N
1° to 2° = SMYE*
2° to 3° = SMYE*1P
3° to 4° = SMYE*2P
 0° to 1° = SMYI*1N
1° to 2° = SMYI*
2° to 3° = SMYI*1P
3° to 4° = SMYI*2P
feed direction away from the chuck (reverse helix)
To determine catalog number replace (*) asterisk with the number 3 or 4. (3 = 3/8 I.C. or 4 = 1/2 I.C.)
0° to -1° = SMYI*2N
-1° to 2° = SMYI*3N
 0° to -1° = SMYE*2N
-1° to 2° = SMYE*3N
 0° to -1° = SMYE*2N
-1° to 2° = SMYE*3N
 0° to -1° = SMYI*2N
-1° to 2° = SMYI*3N