NEXT GENERATION TOOLING
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Next Generation Tooling Now Offers Technical Training!

6/14/2017

3 Comments

 
We are very excited to announce that we are now able to offer on-site technical training to YOUR machinists at YOUR location!  This is offered at no charge  to customers who use any of the manufacturer's whom we represent in California and Nevada.  

However, just because you don't purchase things from us, don't feel left out! We also offer on-site topic specter training on any of the following topics for $150/hour.  

Each presentation lasts about 2 hours.  The presentations last approximately 45-60 minutes with the remaining time for Q&A and discussion about unique applications in your facility.
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Training Classes Available:
Machining 101
  • Basic Boring
  • Basic Chamfering
  • Basic Drill Training
  • Basic End Mill
  • Basic Indexable
  • Basic Tap Training
  • Basic Tool Holders
  • Basic Work Holding / Fixturing​

Advanced Part Manufacturing:
  • Programming Tool Path – Climb versus Conventional
  • Material Machinability – Cubic Inches of Stock Removal
  • Part Set Up / Work Holding / Fixture 
  • Tool Holder Selection, Collet, Solid, Hydraulic, Shrink Fit
  • Cutting Tool Selection – Substrate, Geometry, Coating, Speed and Feeds 
  • Estimating Part Cycle Time
3 Comments

Training Seminar: Everything your team needs to know about Tapping

11/12/2014

0 Comments

 
Next Generation Tooling is excited to offer some new services coming in 2015!

Below is a very fast video of our new training series on Tapping which we can present to your manufacturing team at your site. 

It's a comprehensive overview of screw thread terminology, thread forms, fundamentals of threads, classes of fit, Tap basics, types of chamfers, the tapping process,tap types, screw thread inserts, helix angles, core diameters, re an hook angles, thread reliefs, pitch tolerances, H limits, Tap substrates, Surface treatment and coatings, tapping speeds, tap drill sizes.
osg_tap__die_basic_tap_training.ppt
File Size: 21306 kb
File Type: ppt
Download File

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Tap Tolerance Metric Course & Fine

11/17/2010

4 Comments

 
Basic profile of all ISO metric screw threads
Basic profile of all ISO metric screw threads
The ISO metric screw threads are the world-wide most commonly used type of general-purpose screw thread. They were one of the first international standards agreed when the International Organization for Standardization was set up in 1947.  

​The "M" designation for metric screws indicates the nominal outer diameter of the screw, in millimeters e.g., an M12 screw has a nominal outer diameter of 12 millimeters.
The approved tap tolerance system for metric ISO threads is International Standard ISO 2857.

· 4H tap corresponds to ISO 1
· 6H tap corresponds to ISO 2
· 6G tap corresponds to ISO 3
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4H and 6G taps can be supplied upon request. 6G taps are Oversize. Please refer to the Au "G" values table below.

For the special tolerance "7G", an oversize of approx. 2 x Au "G" has been taken into account.
​

Tolerance Chart - Metric Coarse / Fine

Metric Coarse
Thread
Pitch Tap Tolerance Metric Fine
Thread (choice)
Tap Tolerance
4H Tap 6H Tap 4H Tap 6H Tap
M 1.6 0.35 D2 D2 / D3 M 3 x 0.35 D2 D3
M 1.8 0.35 D2 D2 / D3 M 4 x 0.50 D2 D3
M 2.0 0.40 D2 D3 M 6 x 0.50 D2 / D3 D3 / D4
M 2.2 0.45 D2 D3 M 6 x 0.75 D2 / D3 D4
M 2.5 0.45 D2 D3 M 8 x 0.75 D2 / D3 D4
M 3.0 0.50 D2 D3 M 8 x 1.00 D3 D4 / D5
M 3.5 0.60 D2 D3 / D4 M 12 x 1.00 D3 D4 / D5
M 4.0 0.70 D2 / D3 D3 / D4 M 10 x 1.25 D3 D4 / D5
M 4.5 0.75 D2 / D3 D3 / D4 M 14 x 1.25 D3 D4 / D5
M 5.0 0.80 D2 / D3 D3 / D4 M 12 x 1.50 D3 / D4 D5 / D6
M 6.0 1.00 D2 / D3 D4 / D5 M 20 x 1.50 D3 / D4 D5 / D6
M 7.0 1.00 D2 / D3 D4 / D5 M 24 x 1.50 D3 / D4 D5 / D6
M 8.0 1.25 D3 D4 / D5 M 42 x 1.50 D3 / D4 D5 / D6
M 10.0 1.50 D3 D4 / D5 M 18 x 2.00 D3 / D4 D6 / D7
M 12.0 1.75 D3 / D4 D5 / D6 M 24 x 2.00 D4 D6 / D7
M 14.0 2.00 D3 / D4 D5 / D6 M 42 x 2.00 D4 D6 / D7
M 16.0 2.00 D3 / D4 D5 / D6 M 36 x 3.00 D4 / D5 D7 / D8
M 18.0 2.50 D4 D6 / D7 M 42 x 3.00 D4 / D5 D7 / D8
M 20.0 2.50 D4 D6 / D7 M 52 x 3.00 D4 / D5 D7 / D8
M 22.0 2.50 D4 D6 / D7
M 24.0 3.00 D4 / D5 D7 / D8
M 27.0 3.00 D4 / D5 D7 / D8
M 30.0 3.50 D4 / D5 D7 / D8
M 33.0 3.50 D4 / D5 D8 / D9
M 36.0 4.00 D5 D8 / D9
M 39.0 4.00 D5 D8 / D9
M 42.0 4.50 D5 D8 / D9
M 45.0 4.50 D5 D8 / D9
M 48.0 5.00 D5 / D6 D9 / D10
M 52.0 5.00 D5 / D6 D9 / D10

Tolerance Chart - Oversize 6G Taps

Au "G" Values for Oversize Taps "6G Taps"

Pitch Tap Tolerance
mm inch
0.35 - 0.40 0.019 .00075
0.45 - 0.50 0.020 .00079
0.60 0.021 .00083
0.70 - 0.75 0.022 .00087
0.80 0.024 .00094
1.00 0.026 .0010
1.25 0.028 .0011
1.50 0.032 .0013
1.75 0.034 .0013
2.00 0.038 .0015
2.50 0.042 .0017
3.00 0.048 .0019
3.50 0.053 .0021
4.00 0.060 .0024
4.50 0.063 .0025
5.00 0.071 .0028
4 Comments

Understanding Class of Fit Tap Tolerance for UNC/UNCF

10/20/2010

1 Comment

 
The tolerance of the tap should be manufactured as close as possible to the finished internal thread tolerance.

This practice ensures that the threads produced will comply to the gage tolerances providing that the working conditions such as machine, chucking tools, and workpiece match the application.

H LImits Explained

H limits are used to properly size a tap for the threaded hole to be produced. They are selected based upon the tolerance required for the part. These tolerances are defined by the symbols class 1B, 2B, or 3B.
Understanding Class of Fit Tap Tolerance for UNC UNCF 1B 2B 3B H limit
  • Class 1B has the broadest tolerance and losses fit. Itis generally applied to "hardware grade" type nuts and bolts where ease of assembly and/or disassembly is most important.
  • ​Class 2B is the typical fit for commercial products and is used for fasteners and threaded parts. 
  • Class 3B is the tightest tolerance and used for close fit and high strength fastening applications where a close and snug fit are required.
The sizes of a 2B and a 3B tap are different. The 2B tap is smaller in size. It has an outside diameter of 0860 inches. The 3B tap is larger by .0130 inches, making its outside diameter .0990 inches. As the sizes progress up the tap scale, it increases in size by .0130 inches in outside diameter. Other types of taps, such as hand or fractional taps, increase in increments of 1/4 of an inch and referenced not as a number, but the size in inches

Selecting a H Limit on a tap

Once the class of thread and part tolerance has been defined, an H limit is selected to produce a thread that is within the minimum and maximum limits for that class if fit. These limits are the same as the Go and Not Go thread plug gage dimensions.

​The goal is to select a tap with an H-limit that is near the middle of the part tolerance. For instance, if the total tolerance was .005", the tap should be approximately .0025" larger than the minimum limit of the part and .0025" smaller than the maximum. In order to handle the widest variety of tapping conditions, the "40% rule" is commonly applied.

Using this rule, the tap is selected at 40% of the part tolerance. For instance, if the part tolerance is .005", multiplying .005" by 0.40 equals .002". Thus, the tap would be .002" larger than the minimum limit of the part or Go thread gage.

With the position of the tap in relationship to the part tolerance established, the selection of an H limit number, such as H3, H4, H5, etc. is possible. H limits are a sequence of size "steps" in .0005" increments beginning at the minimum size limit of the part, starting with H1.

​In other words, an H1 limit is one .0005" increment larger than the minimum limit or Go gage, an H2 is two .0005" increments (or .001) larger than the minimum limit, an H3 is three .0005" increments (or .0015") and so on.

​In the example above, a tap that is .002" larger than minimum limit, is four .0005" increments larger, or an H4. This would be the tap H limit recommendation for this tolerance.
UNC Thread Tap Limit UNF Thread Tap Limit
3B (Tap) 2B (Tap) 3B (Tap) 2B (Tap)
No. 1 - 64 H1 / H2 H2 / H3 No. 0 - 80 H1 H1 / H2
No. 2 - 56 H1 / H2 H2 / H3 No. 1 - 72 H1 / H2 H2 / H3
No. 3 - 48 H1 / H2 H2 / H3 No. 2 - 64 H1 / H2 H2 / H3
No. 4 - 40 H2 H2 / H3 No. 3 - 56 H1 / H2 H2 / H3
No. 5 - 40 H2 H2 / H3 No. 4 - 48 H2 H2 / H3
No. 6 - 32 H2 H3 / H4 No. 5 - 44 H2 H2 / H3
No. 8 - 32 H2 H3 / H4 No. 6 - 40 H2 H2 / H3
No. 10 - 24 H2 / H3 H3 / H4 No. 8 - 36 H2 H2 / H3
No. 12 - 24 H2 / H3 H3 / H4 No. 10 - 32 H2 H2 / H3
1/4 - 20 H3 H4 / H5 No. 12 - 28 H2 / H3 H3 / H4
5/16 - 18 H3 H4 / H5 1/4 - 28 H2 / H3 H3 / H4
3/8 - 16 H3 / H4 H4 / H5 5/16 - 24 H3 H3 / H4
7/16 - 14 H3 / H4 H4 / H5 3/8 - 24 H3 H3 / H4
1/2 - 13 H4 H5 / H6 7/16 - 20 H3 H4 / H5
9/16 - 12 H4 H5 / H6 1/2 - 20 H3 H4 / H5
5/8 - 11 H4 H5 / H6 9/16 - 18 H3 / H4 H4 / H5
3/4 - 10 H4 / H5 H6 / H7 5/8 - 18 H3 / H4 H5 / H6
7/8 - 9 H4 / H5 H6 / H7 3/4 - 16 H4 H5 / H6
1 - 8 H5 H6 / H7 7/8 - 14 H4 H5 / H6
1 1/8 - 7 H5 H7 / H8 1 - 12 H4 / H5 H5 / H6
1 1/4 - 7 H5 / H6 H7 / H8 1 1/8 - 12 H4 / H5 H6 / H7
1 3/8 - 6 H6 H7 / H8 1 1/4 - 12 H4 / H5 H6 / H7
1 1/2 - 6 H6 H7 / H8 1 3/8 - 12 H4 / H5 H6 / H7
1 3/4 - 5 H6 / H7 H8 / H9 1 1/12 - 12 H4 / H5 H6 / H7
2 - 4 1/2 H7 H8 / H9
Taps are general marked with the appropriate tolerance class for their intended use. The U.S. GH thread class numbers are not marked on the tap.

Tolerances for the various GH numbers are shown in the chart below

Classification for the tolerance 1B can be provided upon request.

Taps for cast iron and titanium tapping are designed one GH class higher to provide better tool life.

ASME UN Tolerance 1A, 2A, 1B, 2B, Thread
1 Comment

    Technical Support Blog

    At Next Generation Tool we often run into many of the same technical questions from different customers. This section should answer many of your most common questions.

    We set up this special blog for the most commonly asked questions and machinist data tables for your easy reference.

    If you've got a question that's not answered here, then just send us a quick note via email or reach one of us on our CONTACTS page here on the website
    email us

    Authorship

    Our technical section is written by several different people. Sometimes, it's from our team here at Next Generation Tooling & at other times it's by one of the innovative manufacturer's we represent in California and Nevada.

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Established 1995
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Next Generation Tooling
10240 Cavalletti Drive
Sacramento CA 95829
916.765.4227
Northern California
23 Maxwell Street
Suite B
Lodi, CA 95240
Southern California
22343 La Palma Avenue
​Suite 126
Yorba Linda, CA 92887
© 2023 Next Generation Tooling, LLC. 
All Rights Reserved
Created by Rapid Production Marketing

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  • Home
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  • About
    • History
    • Contact
  • Territories
    • NorCal & N-NV
    • SoCal & S-NV
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  • Principals
    • Tooling >
      • 2V Industries
      • BIG Daishowa
      • Champion Storage
      • Drill America
      • Jewell Group
      • Mapal
      • Martindale Gaylee
      • OSG Tool
      • Performance Micro Tool
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    • Workholding >
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