Do you know the difference between a 2B and a 3B thread?

Most inch threaded items are made to a classification standard called the Unified Screw Thread Standard Series.

 

Thread class refers to the acceptable range of pitch diameter for any given thread.

 

Classes 1A, 2A, 3A apply to external threads.

Classes 1B, 2B, 3B apply to internal threads.

 

Class 1 threads are loosely fitting threads intended for ease of assembly. Rarely used in metalworking 

 

Class 2 threads are the most common type of thread.  They are created to maximize strength considering machine practice and usual machine shop capability.

 

Class 3 threads are used for closer tolerances.

 

There are three established classes of thread designed in the Unified series.  

Add "A" for screws (or other external threads) and "B" for nuts (or other internal threads) to show definite limits and tolerances.

Use class A for ordering dies and thread ring gauges
Use class B for ordering taps and thread plug gauges

Tap Recommendations for Classes of Thread Unified and American National Screw Threads 

Any questions or comments?

Please contact the expert: tom@newmantools.com.

Newman Tools sells Acme Single Profile Thread Mills

Acme Single Profile Thread Mills

They are now available in Acme & Stub Acme Thread
forms.

The free cutting design of the SPTM's makes them ideal for the coarse thread pitches associated with Acme & Stub Acme threads.

All SPTM's will cut right and left hand threads in internal and optional external applications.

 Special Features: 

• Manufactured from solid carbide for maximum tool rigidity.
• Long reach tools available for unfavorable length to diameter ratios.
• Thread sizes available up to 1 �"- 5.
• Micro grain carbide uncoated and TiALN coated tools available.
• Single profile design provides a controllable pitch diameter and cut depth.
• Tools will cut both right and left hand threads.
• Low horsepower requirements compared to tapping.
• Produces very small manageable chips which are easily controlled with flood coolant.
• Designed for cutting internal threads.
• Optional external threading available.

Introducing Double Shot Socket Ratchet Wrenches

Double Shot Wrenches

What makes them the best?

• Double Socket Ratchet Wrenches can tighten nuts on long bolts and any length all-thread rod
• Reversible ratchet with easy to operate shifting mechanism
• Sturdy 12 inch long steel handle
• Color coded vinyl handle grips assist wrench identification in the bottom of a trench or the back of a service vehicle
• Lifetime guarantee against defects in material and workmanship

Please click here for different sizes and applications.

For more information please contact us at: tools@newmantools.com or 1-800-465-1384   

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