Plastic Buckle: How Are Buckles Measured?

Some beginner to the world of buckles may be not sure about how to measure the size of buckle and may ask “Which buckle size should I use?”, this question is what we are frequently asked by our customers.

Please note: the size of buckles are not determined by their exterior dimension, they are measured by interior dimension, i.e. side release buckles, tension locks, and slide buckles are measured by the inner widths, when it comes to cord stopper or horn toggle button, we have to check out the cord diameter and find out cord lock with suitable hole diameter.

side release buckle with inner width marked



Common Sizes

The most common sizes of the derlrin buckles that frequently be used in our daily life including 8 mm, 10 mm, 1/2”, 5/8”, 3/4”, 1”, 1-1/4”, 1-1/2”, 1-3/4”, and 2 inch, please take references of below : 

(Mobile phone browser, please swipe the table to the right for more information)

mminchApply to...
87/16badge holder, neck lanyard
103/8cat collar & harness, bow tie, nursing bra
121/2parachute bracelet, glove & mitten
5/815pet collar, bag strap
3/420backpack strap, pet collar
125dog collar, baby harness, life jacket
1-1/432work apron, outdoor equipment
1-1/238collar for large dog, shoulder bag
1-3/444orthopedic restraint
250travel bag, fanny pack

I.e. if your webbing width is 15 mm, refer to the above table, your webbing can then fit in buckles with 5/8" inner width.


However, inner width is not the only key element when we are selecting the buckles, if the webbing is thicker, then we have to use slide buckles with larger inner length, i.e. although the design and inner width of our slide buckle B1 and wide mouth style B3 is quite similar, B3 can pass through thicker because of larger inner length, please check below :

B1 Slide Buckle

B3 Wide Mouth Slide Buckle


Hope that above guide could help you find out the appropriate size of buckle, i
f you have any further question, please feel free to let us know.

For any product information, please contact us with below information:

Tel: +886-4-8355057

Address: No.98, Ln. 6, Sec. 1, Zhongshan Rd., Dacun Township, Changhua County 51545, Taiwan (R.O.C.)



Check out our plastic buckles & bag accessories now at