Plastic Coil & Spiral Wire Margins 

For Spiral Wire and Plastic Coil up to 1/2"
thick including cover, using 4 or 5 holes per inch.
If binding edge measurement ends with any of these dimensions below,
i.e., 11 3/4, add or reduce by the following:
1/16" 
 
none needed 
1/8" 
 
reduce by 1/16" or +3/32" 
3/16" 
 
add 1/16" 
1/4" 
 
none needed 
5/16" 
 
reduce by 1/16" or +1/8" 
3/8" 
 
add 1/16" 
1/2" 
 
reduce by 1/16" or +1/8" 
9/16" 
 
add 1/16" 
5/8" 
 
none needed 
11/16" 
 
reduce by 1/16" 
3/4" 
 
reduce by 3/32" or +3/32" 
13/16" 
 
none needed 
7/8" 
 
reduce by 1/32" or +1/8" 
15/16" 
 
reduce by3/32" or +3/32" 
For any that end in an even measurement add 3/64" (1/32 + )
For all books over 1/2" in thickness no adjustment is needed.




Plastic Coil Hole
Pattern 

There are different hole punching patterns used
by different binderies so contact your vendor.
Books bound in Plastic Spiral Coil have the following hole patterns
in inches.
Book Thickness 

Holes Per Inch 



0+  1/8"
1/8+  3/16"
3/16+  1/4"
1/4+  5/16"
5/16+  3/8"
3/8+  7/16"
7/16+  1/2"
1/2+  3/4"
3/4+  1 3/4"


5
5
5
4
4
4
4
3 ½
3 ½


