Solutions in Industrial
and Commercial Plastics
DIGITAL Catalog Interactive
Catalog
  FREE Catalog Free
Catalog
 
Search
Need Assistance?
Call 800-537-9724

Click For
QUICK
ORDER
SIGN IN.
YOUR ACCOUNT
CART (0)
TOTAL $0.00
How do I know how to calculate a cap & neck size?
Article Title: How do I know how to calculate a cap & neck size?
Article Summary: A brief explanation on understanding the cap & neck finish on bottles.
Article Date: 7/21/2003
Article ID: 625
Share This:

Cap and Neck Finishes
Screw thread cap sizes are generally expressed as two numbers. The first number refers to the cap diameter (in millimeters) and the corresponding Glass Packaging Institute (GPI)/Society of the Plastics Industry (SPI) finish diameter. The second number refers to the height and thread configuration of the closure or finish. The following is a selection of commonly used caps and finishes:
Neck Finish Dimensions
"I" Dimension
The inner diameter of the bottle neck. Specifications require a minimum "I" to allow sufficient clearance for filling tubes. Liner-less closures, with a plug or land seal, and dispensing plugs and fitments require a controlled "I" dimension for a proper fit.
"T" Dimension
The outside diameter of the thread. The tolerance range of the "T" dimension will determine the fit between bottle and closure.
"E" Dimension
The outside diameter of the neck. The difference between the "E" and "T" dimensions, divided by two, determines the thread depth.
"H" Dimension
The height of the neck finish. Measured from the top of the neck to the point where the diameter "T", extended down, intersects the shoulder.

"S" Dimension
Measured from the top of the finish to the top edge of the first thread. The "S" dimension is the key factor which determines the orientation of the closure to the bottle and the amount of thread engagement between the bottle and cap.

 

MM

T

min  max

E

min  max

400H

min  max

410H

min  max

415H

min  max

S

min  max

I

13

.514  .502

.454  .442

-          -

-        -

.457  .437

.052   .022

.218

15

.581   .569

.521   .509

-          -

-        -

.572  .542

.052   .022

.258

18

.704   .688

.620   .604

.385   .355

.536 .508

.632  .602

.052   .022

.325

20

.783   .767

.699   .683

.386   .356

.569 .539

.757  .727

.052   .022

.404

22

.862   .846

.778   .762

.386   .356

.600 .570

.852  .822

.052   .022

.483

24

.940   .924

.856   .840

.415   .385

.661  631

.972  .942

.061   .031

.516

28

1.088 1.058

.994   .974

.415   .385

.723   .693

1.097  1.067

.061   .031

.614

30

1.127 1.107

1.033 1.013

.418   .388

-        -

-        -

.061   .031

.653

33

1.265 1.241

1.171 1.147

.418   .388

-        -

1.289 1.259

.061   .031

.791

35

1.364 1.340

1.270 1.246

.418   .388

-        -

-        -

.061   .031

.875

38

1.476 1.452

1.382 1.358

.418   .388

-        -

-          -

.061   .031

.987

40

1.580 1.550

1.486 1.456

.418   .388

-          -

-          -

061   .031

1.091

43

1.654 1.624

1.560 1.530

.418   .388

-        -

-          -

.061   .031

1.165

45

1.740 1.710

1.646 1.616

.418   .388

-        -

-          -

.061   .031

1.251

48

1.870 1.840

1.776 1.746

.418   .388

-        -

-        -

.061   .031

1.381

51

1.968 1.933

1.874 1.839

.423   .393

-        -

-          -

.061   .031

1.479

53

2.067 2.032

1.973 1.938

.423   .393

-        -

-          -

.061   .031

1.578

58

2.224 2.189

2.130 2.095

.423   .393

-        -

-          -

.061   .031

1.735

60

2.342 2.307

2.246 2.213

.423   .393

-        -

-          -

.061   .031

1.883

63

2.461 2.426

2.367 2.332

.423   .393

-        -

-          -

.061   .031

1.972

65

2.579 2.544

2.485 2.450

.423   .393

-          -

-          -

061   .031

2.090

70

2.736 2.701

2.642 2.607

.423   .393

-        -

-          -

.061   .031

2.247

75

2.913 2.878

2.819 2.784

.423   .393

-          -

-          -

061   .031

2.424

77

3.035 3.000

2.941 2.906

.502   .472

-        -

-          -

.075   .045

2.546

83

3.268 3.233

3.148 3.113

.502   .472

-        -

-          -

.075   .045

2.753

89

3.511 3.476

3.391 3.356

.550   .520

-        -

-          -

075   .045

2.915

100

3.397 3.902

3.817 3.782

.612   .582

-        -

-          -

075   .045

3.344

110

4.331 4.296

4.211 4.176

.612   .582

-        -

-          -

075   .045

3.737

120

4.724 4.689

4.604 4.569

.700   .670

-        -

-          -

075   .045

4.131

 

MM

13

15

18

20

22

24

28

30

33

35

38

40

43

45

48

Thread/Inch

12

12

8

8

8

8

6

6

6

6

6

6

6

6

6

 

MM

51

53

58

60

63

65

70

75

77

83

89

100

110

120

Thread/Inch

6

6

6

6

6

6

6

6

6

5

5

5

5

5



92 user(s) found this article useful.
Was this article useful to you?
<< Search More Articles

Information disclaimer
The information contained in this article is for general information purposes only. The information is provided by United States Plastic Corp. and while we endeavor to keep the information up to date and correct, we make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect to the website or the information, products, services, or related graphics contained on the website for any purpose. Any reliance you place on such information is therefore strictly at your own risk.
In no event will we be liable for any loss or damage including without limitation, indirect or consequential loss or damage, or any loss or damage whatsoever arising from loss of materials, time or profits arising out of, or in connection with, the use of this information.


Your Account
Create New Account
Your Account Profile
E-mail Subscriptions
Your Orders
Track An Order
Order History
Ordered Items History
Site Features
Knowledgebase
Clearance Products
New Products
Other Divisions
NeatlySmart®
Tamco Industries
Signup for weekly email updates:
Stay Connected: Facebook Twitter Google+ YouTube LinkedIn

1390 Neubrecht Rd, Lima Ohio, 45801-3196 Phone: 1-800-809-4217 Fax: 1-800-854-5498
© 2014 United States Plastic Corporation®  Prices and offers subject to change.
Press Esc to close
Close     View Cart