NPT Stainless Steel Fitting ASTM A182 F304 Threadolet MSS SP-97
What is a threadolet?
A threadolet is exactly the same as the weldolet with the main difference being that it connects to the branch pipe through a thread.Another difference of the threadolet with respect to the weldolet is the fact that it is used in applications with much lower pressures and smaller diameters.
The thread of this type of connection is generally of the NPT type according to ASME B1.20.1 specifications.
Specifications of threadolet:
| Size | 1/8" - 4" / DN6 - DN100 |
| Pressure | 3000lbs / 6000lbs |
| Manufacturing Standard | MSS SP-97 |
| Carbon Steel | ASTM A105, 20# |
| Low Temperature Steel | ASTM A350 LF2, 16Mn |
| Alloy Steel | ASTM A182 F11 / F12 / F5 / F9 / F91 / F92 |
| Stainless Steel | ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904L |
| Duplex Steel | ASTM A182 F51, F53, F44 |
Referenced Weight Chart:
| Branch Nominal Size | THRD Outler |
| DN | NPS | 3000 | 6000 |
| 6 | 1/8 | 0.05 | - |
| 8 | 1/4 | 0.05 | - |
| 10 | 3/8 | 0.09 | - |
| 15 | 1/2 | 0.17 | 0.32 |
| 20 | 3/4 | 0.22 | 0.47 |
| 25 | 1 | 0.43 | 0.65 |
| 32 | 1¼ | 0.61 | 0.96 |
| 40 | 1½ | 0.69 | 1.28 |
| 50 | 2 | 1.10 | 2.15 |
| 65 | 2½ | 1.52 | - |
| 80 | 3 | 2.50 | - |
| 100 | 4 | 4.10 | - |
MSS SP-97 Threadolet Dimensions
| Branch Nominal Size | Length | OD of Fitting | OD at End of Branch | Length of Thread | Cut Hole Dia. |
| DN | NPS | 3000 | 6000 | 3000 | 6000 | 3000 | 6000 | 3000 | 6000 |
| 6 | 1/8 | 19 | | 27 | | 22 | | 6.7 | 16 | |
| 8 | 1/4 | 19 | | 27 | | 22 | | 10.2 | 16 | |
| 10 | 3/8 | 21 | | 30 | | 25 | | 10.4 | 19 | |
| 15 | 1/2 | 25 | 32 | 38 | 45 | 33 | 42 | 13.6 | 24 | 19 |
| 20 | 3/4 | 27 | 37 | 47 | 52 | 39 | 48 | 13.9 | 30 | 25 |
| 25 | 1 | 33 | 40 | 56 | 63 | 48 | 58 | 17.3 | 36 | 33 |
| 32 | 1 1/4 | 33 | 41 | 66 | 72 | 58 | 67 | 18 | 45 | 38 |
| 40 | 1 1/2 | 35 | 43 | 75 | 83 | 64 | 77 | 18.4 | 51 | 49 |
| 50 | 2 | 38 | 52 | 90 | 104 | 77 | 93 | 19.2 | 65 | 59 |
| 65 | 2 1/2 | 46 | | 105 | | 94 | | 28.9 | 76 | |
| 80 | 3 | 51 | | 124 | | 114 | | 30.5 | 94 | |
| 100 | 4 | 57 | | 154 | | 140 | | 33 | 121 |
Stainless Steel F304 Equivalent Grades:
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| F304 | 1.4301 | S30400 | SUS 304 | 304S31 | 08Х18Н10 | Z7CN18‐09 | X5CrNi18-10 |
Chemical Composition of F304:
| Grade | C | Mn | P | S | Si | Ni | Cr | Fe |
| F304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.0 | 8-11 | 18-20 | Bal. |
Applications:
Thredolets are used for low-pressure 90-degree pipe branches.
The branch pipe is screwed on the Thredolet, which is welded on the run pipe.
The threading is generally of the NPT type and conforms to the ASME B1.20.1 specification.
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NPT Stainless Steel Fitting ASTM A182 F304 Threadolet MSS SP-97 Images
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