Steel Pipes/Plain/Metric Thread

Caution
- There may be some scratches on the surface of the steel pipe remaining from threading operation. This does not affect quality.
- There may be rust on the inner surface of SGG_.
Product Description
[Features]·You can specify the L dimension length for the L dimension specification type. ·L dimension fixed type, C shape, unpainted only.
Dimensional Drawing
| Shape P | ShapeD | |
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| Shape A | Shape E | |
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| Shape W | Shape F | |
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| Shape C | Shape G | |
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| Part Number | [M] Material | Standards | Application | [S] Surface Treatment | Pressure Resistance (JIS Reference Value) |
| SGG□ | SGP | JIS G3452 | Pneumatic Pipes for Low Operating Pressure Steam/Water/Oil/Gas | — | 2.5 MPa |
| SGP□□ | SGP (White) | JIS G3452 | Pipes for draining water, air conditioning, etc. | Zinc Plating | 2.5 MPa |
| SUT□□ | SUS304TP (Sch80:6A to 10A) (Sch40: 15A to 50A) | JIS G3459 | Corrosion / Low Temperature / High Temperature Resistant Pipes | — | ·6 A to 10 A: 12 MPa ·15 A to 50 A: 6 MPa |
| SUTS□ | SUS316TP (Sch80:6A to 10A) (Sch40: 15A to 25A) | JIS G3459 | — | ·6 A to 10 A: 12 MPa ·15 A to 25 A: 6 MPa | |
| STPG□ | STPG370 (Sch40) | JIS G3454 | Pressure pipes to be used under 350°C | — | 6 MPa |
| SGHP□ | STPG370 (Sch80) | JIS G3454 | — | 12 MPa |
Part Number | Pipe manufacturing method |
SGG, SGP | Electric resistance welding |
SUT, SUTS | Seamless |
STPG, SGHP | Seamless |

(1) Thread Nominal | Thread | Gauge Dia. | Position of Gauge Dia. | Tolerance of Parallel Female Thread D, D2, and D1 | Effective Thread Length (Min.) | Dimensions of Carbon Steel Pipe (Reference) | |||||||||||
Number of Threads in 25.4mm n | Pitch P (Reference) | Height of Threads h | Roundness r or r′ | Male Thread | Male Thread | Female Thread | Male Thread | Female Thread | |||||||||
From Position of Gauge Dia. to Large Dia. Side f | With Imperfect Thread Portion | W/O Imperfect Thread Portion | |||||||||||||||
From Pipe End | Pipe End | ||||||||||||||||
O.D. d | Effective Dia. d2 | Root Dia. d1 | Tapered Female Threads | Parallel Female Threads | Tapered Female Threads , Parallel Female Threads | ||||||||||||
Reference Length a | Tolerance in Direction of axis b | Tolerance in Direction of axis c | |||||||||||||||
Female Thread | From Position of Gauge Dia. to Small Dia. Side ℓ | From Pipe End or Pipe Joint End ℓ′ (Reference) | t(2) | O.D. | Thickness | ||||||||||||
Root Dia. D | Effective Dia. D2 | I.D. D1 | |||||||||||||||
| R1/16 | 28 | 0.9071 | 0.581 | 0.12 | 7.723 | 7.142 | 6.561 | 3.97 | ±0.91 | ±1.13 | ±0.071 | 2.5 | 6.2 | 7.4 | 4.4 | - | - |
| R1/8 | 28 | 0.9071 | 0.581 | 0.12 | 9.728 | 9.147 | 8.566 | 3.97 | ±0.91 | ±1.13 | ±0.071 | 2.5 | 6.2 | 7.4 | 4.4 | 10.5 | 2.0 |
| R1/4 | 19 | 1.3368 | 0.856 | 0.18 | 13.157 | 12.301 | 11.445 | 6.01 | ±1.34 | ±1.67 | ±0.104 | 3.7 | 9.4 | 11.0 | 6.7 | 13.8 | 2.3 |
| R3/8 | 19 | 1.3368 | 0.856 | 0.18 | 16.662 | 15.806 | 14.950 | 6.35 | ±1.34 | ±1.67 | ±0.104 | 3.7 | 9.7 | 11.4 | 7.0 | 17.3 | 2.3 |
| R1/2 | 14 | 1.8143 | 1.162 | 0.25 | 20.955 | 19.793 | 18.631 | 8.16 | ±1.81 | ±2.27 | ±0.142 | 5.0 | 12.7 | 15.0 | 9.1 | 21.7 | 2.8 |
| R3/4 | 14 | 1.8143 | 1.162 | 0.25 | 26.441 | 25.279 | 24.117 | 9.53 | ±1.81 | ±2.27 | ±0.142 | 5.0 | 14.1 | 16.3 | 10.2 | 27.2 | 2.8 |
| R1 | 11 | 2.3091 | 1.479 | 0.32 | 33.249 | 31.770 | 30.291 | 10.39 | ±2.31 | ±2.89 | ±0.181 | 6.4 | 16.2 | 19.1 | 11.6 | 34 | 3.2 |
| R11/4 | 11 | 2.3091 | 1.479 | 0.32 | 41.910 | 40.431 | 38.952 | 12.70 | ±2.31 | ±2.89 | ±0.181 | 6.4 | 18.5 | 21.4 | 13.4 | 42.7 | 3.5 |
| R11/2 | 11 | 2.3091 | 1.479 | 0.32 | 47.803 | 46.324 | 44.845 | 12.70 | ±2.31 | ±2.89 | ±0.181 | 6.4 | 18.5 | 21.4 | 13.4 | 48.6 | 3.5 |
| R2 | 11 | 2.3091 | 1.479 | 0.32 | 59.614 | 58.135 | 56.656 | 15.88 | ±2.31 | ±2.89 | ±0.181 | 7.5 | 22.8 | 25.7 | 16.9 | 60.5 | 3.8 |
| R21/2 | 11 | 2.3091 | 1.479 | 0.32 | 75.184 | 73.705 | 72.226 | 17.46 | ±3.46 | ±3.46 | ±0.216 | 9.2 | 26.7 | 30.1 | 18.6 | 76.3 | 4.2 |
| R3 | 11 | 2.3091 | 1.479 | 0.32 | 87.884 | 86.405 | 84.926 | 20.64 | ±3.46 | ±3.46 | ±0.216 | 9.2 | 29.8 | 33.3 | 21.1 | 89.1 | 4.2 |
| R4 | 11 | 2.3091 | 1.479 | 0.32 | 113.030 | 111.551 | 110.072 | 25.40 | ±3.46 | ±3.46 | ±0.216 | 10.4 | 35.8 | 39.3 | 25.9 | 114.3 | 4.5 |
| R5 | 11 | 2.3091 | 1.479 | 0.32 | 138.430 | 136.951 | 135.472 | 28.58 | ±3.46 | ±3.46 | ±0.216 | 11.5 | 40.1 | 43.5 | 29.3 | 139.8 | 4.5 |
| R6 | 11 | 2.3091 | 1.479 | 0.32 | 163.830 | 162.351 | 160.872 | 28.58 | ±3.46 | ±3.46 | ±0.216 | 11.5 | 40.1 | 43.5 | 29.3 | 165.2 | 5.0 |
(2): Taper threads are the length from the position of gauge dia. to the small diameter side, and parallel female threads are the length from the pipe or
pipe joint end.
Remarks: 1. The threads are perpendicular to the central axis line and the pitch is measured along the central axis line.
2. The effective thread length is the length of the fully threaded thread, only the last few threads of which may be allowed to have a pipe or
pipe joint face remaining at the top.
Even if the pipe or pipe joint end is chamfered, this portion is included in the effective thread length.
3. If the value is not close to the value in this table, it shall be in accordance with the standards for parts specified separately.
(*) The types of tapered threads for pipes include tapered male threads, tapered female threads, and parallel female threads.
This parallel female threads are used with tapered male threads, and the dimension tolerances differ from those of the parallel female threads specified in JIS B 0202.
Specifications/Overview
■Coating Color Type (Japan Paint Manufacturers Association, 1997 U-edition No.): For identification of internal fluid● Threaded section is not painted. ●Inner surface of pipes may not be painted.
| White | Brown | Blue | ||
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| UN-95 | U17-50 L | U72-50P | ||
| Approx. Munsell | Approx. Munsell | Approx. Munsell | ||
| No. N9.5 | No. 7.5YR5/6 | No. 2.5PB5/8 | ||
| Light Yellow | Dark Red | Black | ||
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| U22-80 L | U07-30 L | UN-10 | ||
| Approx. Munsell | Approx. Munsell | Approx. Munsell | ||
| No. 2.5Y8/6 | No. 7.5R3/6 | No. N1 |
| Material Types | Identification Color | Munsell Value (Reference Value) |
| Air | White | N9.5 |
| Oil | Brown | 7.5YR5/6 |
| Water | Blue | 2.5PB5/8 |
| Gas | Light Yellow | 2.5Y8/6 |
| Steam | Dark Red | 7.5R3/6 |
* No surface treatment on male thread portion of SGP□.
* Male threads are covered with sealing tape before shipping.
* Excessive tightening
may deform the female thread portion. Wrap with sealing tape for air tightness, hand tighten first, and then final tighten by giving approx. one more rotation.
Marks may be left on the surface when tightening screws.













