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Frequently Asked Questions (FAQ)

Please use the feedback form to submit your question to us if you cannot find your answer in our FAQ. Do not forget to enter your e-mail address to receive our answer.

General

Which email address should I use to contact Teesing?

Our general email address for our headquarters in the Netherlands customercare@teesing.nl

You can also sent your order directly to orders@teesing.nl

For information directed to our office in the USA: teesingusa@teesing.com
For information directed to our office in Taiwan: teesingtaiwan@teesing.com
For information directed to our office in China: teesingchina@teesing.com 

How can I reach you by phone?

In the Netherlands, our telephone number is 070 413 07 00. The direct sales number is 070 413 07 50.
In the USA, our telephone number is +(1) 973 383 0691

What is the contact address?

Verrijn Stuartlaan 40
2288 EL RIJSWIJK
The Netherlands

P.O.Box 16, 2280 AA RIJSWIJK

What are the opening hours for calling Teesing?

We are available during workdays from 8:30 to 17:00 pm.

I have a complaint and / or comment, where can I go?

If you have a complaint and / or comment then please let us know. You can contact us by phone or report your complaint via our email address: Customercare@teesing.nl. You can expect a response within 24 hours during workdays from us.

Where can I find the delivery time of my order?

This can be found on the order confirmation.

Is your question not listed above?

Please send an email to Customercare@teesing.nl and we will answer it a.s.a.p..

Ordering

Can I order by phone?

Of course you can order by phone or call for advice on 070 413 07 50

How do I know whether my order has been received?

After you have placed a order with us, you will receive a confirmation mail.

Is it possible to place an urgent order?

Of course! Depending on the supplier, the cost will vary. Please contact our Sales Engineers.

Are partial deliveries possible?

Yes this is possible.

Are there better prices or volume discounts to be obtained when ordering large quantities?

This can be discussed with our account manager.

Can orders be directly delivered from the vendor, and what will be the costs?

By default, we don’t do this but only as an exception. There are extra cost involved that are passed on to the customer.

Which department can I call if the product information is not entirely clear? (Application etc.)

The customer care department ensures you will get the right information.

Product information

Where can I find general product information?

All product information can be found under product information.

Are there 3D drawings available from all products?

They are not yet available online but if you want to receive a 3D drawing please sent an email to Customercare@teesing.nl

Where can I find PDFs / Datasheets of the products?

Datasheets can be found on product information pages below the tab "Datasheets".

About threads

How to identify thread types?

Check out basics of thread guide.

1. Determine if the thread is male or female (visual inspection)?
2. Determine if the thread is tapered or straight/parallel (visual inspection)?
    • Check: Measure the thread with a caliper at the beginning and the end, if it is the same value the thread is straight/parallel.
3. Measure the thread diameter (male: major diameter, female: minor diameter).
   • The diameter measurement obtained in this step may not be exactly the same as the listed nominal size for the given thread. The main    
      reason for this variation is industry or manufacturing tolerances.
4. Determine the thread pitch.
    • Easiest with the use of a pitch gauge.
5. Identify the end connection.
    • Most common angles: 30°, 37° and 45°.

Thread identification example

According to the mentioned method:
1. The fitting is visibly male.
2. The thread is visibly straight.
3. The meassured diameter is 26,4 mm (this can be easily converted: inches decimal x 25,4 = mm).
4. Threads per inch (TPI): 14
    • When you are not sure, you can search the threading table for a matching diameter and find the possible thread pitches. (For example         
       UNC and UNF have ‘the same diameter’ but the TPI is different 20 or 28).
5. Not applicable. Result: G3/4 male thread.

What does NPTF stand for: Female, Fine or Fuel?

NPTF stands for National Pipe Taper Fuel. This could be male or female. NPTF is designed to provide a more leak-free seal without the use of teflon tape or other sealant compound. A common mistake is to assume that NPTF stands for NPT female or NPT fine. NPT fine does not exist.

Which female threads are tapered/conical?

Most common used tapered internal threads:
NPT
• BSPT: Rc

What is the difference between G-thread (BSPP) and R-thread (BSPT)?

BSPT thread is tapered when we speak about male thread (R), but the female thread can be tapered (Rc) or parallel (Rp). BSPP thread is parallel, male and female (G).

What is the difference then between female parallel Rp-thread and female parallel G-thread?

G-threads have a parallel shape in accordance with the DIN-EN-ISO 228-1 standard.
Rp-threads have a parallel shape in accordance with the ISO 7-1 and DIN-EN 10226-1 standard.
In the case of a thread of size 1/8”, for example, the threads are specified as G1/8 or R1/8.
Male G-threads (parallel) can only be screwed into female G-threads.
Male R-threads (tapered) can be screwed into female G or R-threads.
The following table shows the internal minimum thread diameter, with the upper deviation.

G-Withworth pipe thread

RP - Withworth pipe thread

TPI Drill ∅B Nut
thread
minor
 ∅ Min
Nut
thread
minor
 ∅ max
TPI Drill ∅B Nut
thread
minor 
∅ Min 
Nut
thread
minor 
∅ max 
G 1/16 28 7.723 6.80 6.516 6.843 Rp 1/16 28 7.723 6.55 6.490 6.632
G 1/8 28 9.728 8.80 8.566 8.848 Rp 1/8 28 9.728 8.60 8.495 8.637
G 1/4 19 13.157 11.80 11.445 11.890 Rp 1/4 19 13.157 11.50 11.341 11.549
G 3/8 19 16.662 15.25 14.950 15.395 Rp 3/8 19 16.662 15.00 14.846 15.054
G 1/2 14 20.955 19.00 18.631 19.172 Rp 1/2 14 20.955 18.50 18.489 18.733
G 5/8 14 22.911 21.00 20.587 21.128 - - - - - -
G 3/4 14 26.441 24.50 24.117 24.658 Rp 3/4 14 29.441 24.00 23.975 24.259
G 7/8 14 30.201 28.25 27.877 28.418 - - - - - -
G 1 11 33.249 30.75 30.291 30.931 Rp 1 11 33.249 30.25 30.111 30.471
G 1.1/8 11 37.897 35.50 34.939 35.579 - - - - - -
G 1.1/4 11 41.910 39.50 38.952 39.592 Rp1.1/4 11 41.910 39.00 38.772 39.132
G1.3/8 11 44.320 42.00 41.365 42.005 - - - - - -
G1.1/2 11 47.803 45.25 44.854 45.485 Rp1.1/2 11 47.803 45.00 44.665 45.025
G1.3/4 11 53.764 51.10 50.788 51.428 - - - - - -
G 2 11 59.614 57.00 56.656 57.296 Rp 2  11 59.614 56.50 56.476 56.836
G 2.1/4 11 65.710 63.10 62.752 63.392 - - - - - -
G 2.1/2 11 75.184 73.00 72.226 72.866 Rp 2.1/1 11 75.184 72.25 72.083 72.443
G 2.3/4 11 81.534 79.00 78.576 79.216 - - - - - -
G 3 11 87.884 85.50 84.926 85.566 Rp 3 11 87.884 85.00 84.783 85.143
G 3.1/2 11 100.330 98.00 97.327 98.012 - - - - - -
G 4 11 113.030 110.50 110.072 110.712 Rp 4  11 113.030 110.00 109.860 110.289
The tolerances on the pitch diameter of the internal G-threads correspond to the ‘positive’ deviation of the diameter tolerances in ISO 7-1, with the exception of those for thread sizes 1/16, 1/8, 1/4 and 3/8, for which slightly higher values are specified.

Internal g-thread

                                Rp-thread

Designation
of thread
Number of threads in
25.4 mm
Pitch Tolerance on pitch diameter

Thread size Equivalent diametral tolerance on parallel internal threads
(mm)
Internal thread lower deviation Internal thread Upper deviation
1/16 28 0.907 0 +0.107 1/16 +/-0.071
1/8 28 0.907 0 +0.107 1/8 +/-0.071
1/4 19 1.337 0 +0.125 1/4 +-/0.104
3/8 19 1.337 0 +0.125 3/8 +/-0.104
1/2 14 1.814 0 +0.142 1/2 +/-0.142
5/8 14 1.814 0 +0.142 - -
3/4 14 1.814 0 +142 3/4 +/-0.142
7/8 14 1.814 0 +0.142 - -
1 11 2.309 0 +0.180 1 +/-0.180
1 1/8 11 2.309 0 +0.180 - -
1 1/4 11 2.309 0 +0.180 1 1/4  +/-0.180
1 1/2 11 2.309 0 +0.180 1 1/2 +/-0.180
1 34/ 11 2.309  0 +0.180 - -
2 11 2.309 0 +0.180 2 +/-0.180
The combination of an external parallel thread G, tolerance A or B in accordance with DIN-EN-ISO
228-1 with an internal parallel thread Rp in accordance with ISO 7-1, needs special consideration.
When it is necessary to have this combination, the positive or negative tolerance of the internal
thread in accordance with ISO 7-1 shall be considered in the relevant product standards, where
external parallel thread G are used.

Never try to match a BSP fitting with an NPT (or NPS) fitting if the pressure holding capability is at all critical.


 

Can I use an o-ring sealing with NPT thread?

Sealing NPT thread with an o-ring is impossible.  NPT thread is tapered thread and should screw in only partway. Therefore, the sealing itself is realized directly on the thread, with PTFE tape or a liquid sealant.

Are NPT and BSP Pipe threads compatible?

While NPT threads are common in the United States, BSP threads are widely used in many other countries.
NPT/NPS and BSP threads are not compatible due to the differences in their thread forms, and not just the fact that most diametrical sizes have a different pitch. NPT/NPS threads have a 60° included angle and have flattened peaks and valleys; BSP threads have a 55° included angle and have rounded peaks and valleys.
(Sometimes ½” and ¾” NPT and BSP threads are combined, because they are very close in design, they have the same pitch).

Never try to mate a BSP fitting with an NPT (or NPS) fitting if the pressure holding capability is at all critical.

Pipe size

Pitch (threads/inch)
NPT/NPS BSP     
1/16 27 -
1/8 27 28
1/4 18 19
3/8 18 19
1/2 14 14
5/8 - 14
3/4 14 14
1 11 1/2 11

 

What is screw/nut galling and how can it be avoided?

Galling occurs when two like metals rub against each other.  As the metals heat up from friction, the molecules of each bind together, eventually causing failure as the surfaces weld together. The higher the speed and the higher the pressure, the more likely this is to occur. Often different kind of fasteners, such as those made of stainless steel, aluminum and titanium are most likely to be subject to galling when tightened. Galling can be avoided by good lubrication, by using PTFE tape and by using brass or plastic nuts instead of for example stainless steel nuts. Metal-to-metal contacts are appropriate for low duty cycles or when good lubrication can be supplied, otherwise, stainless steel nuts running on stainless steel screws should be avoided. 

What kind of sealing method is recommended when mounting a PA/PVDF fitting with male tapered thread into a metal counterpart?

This combination of materials is not ideal and therefore not recommended. However, when this combination is prescribed, our advice is to use PTFE-tape. There is a possibility that a leak tight connection can be achieved without PTFE-tape, but there is a greater chance of damaging the thread on the PA/PVDF coupling. Damaged thread increases the risk of leaks and after removal the fitting must be replaced.

What kind of thread does a JIC-fitting have?

A JIC-fitting -Joint Industry Council- is a type of flare fitting machined with a 37-degree flare seating surface and UNF thread. The flare fittings seal with metal to metal contact between the flared nose of the fitting and the flared tube face in the female connection.

Fitting size (JIC) UNF thread       
D02 5/16x24
D03 3/8x24
D04 7/16x20
D05 1/2x20
D06 9/16x18
D07 5/8x18
D08 3/4x16
D10 7/8x14
D12 1 1/16x12
D16 1 5/16x12
D20 1 5/8x12
D24 1 7/8x12



Jic fitting

How can I seal thread?

Parallel and tapered threads require different sealing solutions.

When the female thread and the male thread are both parallel an o-ring or bonded seal is often used. O-rings are one of the most common seals, because they are inexpensive, easy to make, reliable and have simple mounting requirements. When the male thread is tapered an o-ring seal can’t be used, because the thread can only be screwed in only partially. At Teesing we use PTFE tape or Loctite. Without an additional sealant all tapered threads leak! The sealant reduces the potential for galling of the threads.

Thread seal types