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ASME B16.11 Threadolet provides a self-reinforced branch connection that eliminates the need for reinforcing pads. While frequently grouped with its siblings-the Weldolet and Sockolet-the Threadolet is unique because it transitions from a welded header to a threaded branch, typically using NPT (National Pipe Thread) or BSPT threads.
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Material Synergy
In coastal regions like the UAE or Louisiana, atmospheric corrosion is a major factor. Forged ASTM A105 carbon steel is standard, but for sour service or corrosive environments, specifying ASTM A182 F316L (Stainless) or Duplex Steel (F51/F53) is essential. The dimensions remain the same, but the service life changes drastically.
Thread Engagement & The "Perfect Thread"
Per ASME B1.20.1, the Threadolet must provide a minimum length of "perfect thread." If you are in a region using British standards (like parts of Europe or Australia), ensure the manufacturer provides BS 21 (BSPT) threads rather than the American NPT to avoid cross-threading disasters during field assembly.
Geometric Reinforcement
Unlike a standard "half-coupling," a Threadolet features a contoured base designed to fit the specific curvature of the "run" pipe. This distributes stress more evenly. When ordering, you must specify both the Branch Size and the Run Size.
|
Nominal size |
End-to-end |
End-to-end |
Outside diameter |
End wall |
Length of thread |
|||||
|
DN |
NPS |
W |
P |
D |
G |
L5min |
L2min |
|||
|
3000 & 6000 |
3000 |
6000 |
3000 |
3000 |
3000 |
3000 |
||||
|
6 |
1/8 |
32 |
19 |
- |
16 |
22 |
4.8 |
- |
6.4 |
6.7 |
|
8 |
1/4 |
35 |
25 |
27 |
19 |
25 |
4.8 |
6.4 |
8.1 |
10.2 |
|
10 |
3/8 |
38 |
25 |
27 |
22 |
32 |
4.8 |
6.4 |
9.1 |
10.4 |
|
15 |
1/2 |
48 |
32 |
33 |
28 |
38 |
6.4 |
7.9 |
10.9 |
13.6 |
|
20 |
3/4 |
51 |
37 |
38 |
35 |
44 |
6.4 |
7.9 |
12.7 |
13.9 |
|
25 |
1 |
60 |
41 |
43 |
44 |
57 |
9.7 |
11.2 |
14.7 |
17.3 |
|
32 |
11/4 |
67 |
44 |
46 |
57 |
64 |
9.7 |
11.2 |
17.0 |
18.0 |
|
40 |
11/2 |
79 |
44 |
48 |
64 |
76 |
11.2 |
12.7 |
17.8 |
18.4 |
|
50 |
2 |
86 |
48 |
51 |
76 |
92 |
12.7 |
15.7 |
19.0 |
19.2 |
|
65 |
21/2 |
92 |
60 |
64 |
92 |
108 |
15.7 |
19.0 |
23.6 |
28.9 |
|
80 |
3 |
108 |
65 |
68 |
108 |
127 |
19.0 |
22.4 |
25.9 |
30.5 |
|
100 |
4 |
121 |
68 |
75 |
140 |
159 |
22.4 |
28.4 |
27.7 |
33.0 |
Note:
1) NPT thread shall be machined as per GB/T 12716 (equivalent to ASME B1.20.1).
Frequently Asked Questions
1. Can a Threadolet be used for 45-degree branches?
No. For 45-degree lateral connections, you must specify a Latrolet. Threadolets are strictly for 90-degree take-offs.
2. What is the difference between Class 3000 and 6000 dimensions?
Class 6000 fittings have a significantly larger "wall thickness" and overall height (A) to accommodate the increased internal pressure and mechanical stress.
