| Compatibility & Interchange: |
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| Construction: |
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| Seal Components: |
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| Note: |
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| Additional Information: |
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| ST-Series | Heavy-Duty Flushface Rated Pressure Chart | ||||||||
|---|---|---|---|---|---|---|---|---|
| Body Size | Steel Coupler/Plug Coupled | 316 Stainless Coupler/Plug Coupled | ||||||
| Maximum Working | Burst | Maximum Working | Burst | |||||
| 1/4″ | 10,000 PSI (700 bar) | 27,300 PSI (1,800 bar) | 5,000 PSI (345 bar) | 28,000 PSI (1,900 bar) | ||||
| 3/8″ | 10,000 PSI (700 bar) | 27,300 PSI (1,800 bar) | 5,000 PSI (345 bar) | 28,000 PSI (1,900 bar) | ||||
| 1/2″ | 10,000 PSI (700 bar) | 22,500 PSI (1,500 bar) | 5,000 PSI (345 bar) | 25,000 PSI (1,700 bar) | ||||
| 3/4″ | 7,500 PSI (500 bar) | 20,200 PSI (1,400 bar) | 5,000 PSI (345 bar) | 22,800 PSI (1,550 bar) | ||||
| 1″ | 7,500 PSI (500 bar) | 19,400 PSI (1,300 bar) | 4,000 PSI (275 bar) | 18,500 PSI (1,250 bar) | ||||
| 1″-V2 | 8,500 PSI (585 bar) | 25,900 PSI (1,750 bar) | – | – | ||||
| 2″ | 5,000 PSI (345 bar) | 16,000 PSI (1,100 bar) | 3,000 PSI (200 bar) | 10,000 PSI (700 bar) | ||||
| ST-Series | Heavy-Duty Flushface Plug (Female Threads) | |||||||
|---|---|---|---|---|---|---|---|
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| Part Number |
Coupling Type |
Body Size |
Threads | Material | Length | Max. OD |
Hex |
| ST2F2 | Plug/Male | 1/4″ | 1/4″ – 18 Female NPTF | Steel | 1.84″ (46.7mm) |
0.90″ (22.9mm) |
13/16″ |
| ST2F2-SS | Plug/Male | 1/4″ | 1/4″ – 18 Female NPTF | 316 Stainless | 1.84″ (46.7mm) |
0.90″ (22.9mm) |
13/16″ |
| ST2BF2 | Plug/Male | 1/4″ | 1/4″ – 19 Female BSPP | Steel | 1.84″ (46.7mm) |
0.90″ (22.9mm) |
13/16″ |
| ST2BF2-SS | Plug/Male | 1/4″ | 1/4″ – 19 Female BSPP | 316 Stainless | 1.84″ (46.7mm) |
0.90″ (22.9mm) |
13/16″ |
| ST3F2 | Plug/Male | 3/8″ | 1/4″ – 18 Female NPTF | Steel | 2.32″ (58.9mm) |
1.48″ (37.6mm) |
1″ |
| ST3F3 | Plug/Male | 3/8″ | 3/8″ – 18 Female NPTF | Steel | 2.32″ (58.9mm) |
1.48″ (37.6mm) |
1″ |
| ST3F3-SS | Plug/Male | 3/8″ | 3/8″ – 18 Female NPTF | 316 Stainless | 2.32″ (58.9mm) |
1.48″ (37.6mm) |
1″ |
| ST3BF3 | Plug/Male | 3/8″ | 3/8″ – 19 Female BSPP | Steel | 2.32″ (58.9mm) |
1.48″ (37.6mm) |
1″ |
| ST3BF3-SS | Plug/Male | 3/8″ | 3/8″ – 19 Female BSPP | 316 Stainless | 2.32″ (58.9mm) |
1.48″ (37.6mm) |
1″ |
| ST3F4 | Plug/Male | 3/8″ | 1/2″ – 14 Female NPTF | Steel | 2.32″ (58.9mm) |
1.48″ (37.6mm) |
1″ |
| ST3F4-SS | Plug/Male | 3/8″ | 1/2″ – 14 Female NPTF | 316 Stainless | 2.32″ (58.9mm) |
1.48″ (37.6mm) |
1″ |
| ST3BF4 | Plug/Male | 3/8″ | 1/2″ – 14 Female BSPP | Steel | 2.32″ (58.9mm) |
1.48″ (37.6mm) |
1″ |
| ST3BF4-SS | Plug/Male | 3/8″ | 1/2″ – 14 Female BSPP | 316 Stainless | 2.32″ (58.9mm) |
1.48″ (37.6mm) |
1″ |
| ST4F4 | Plug/Male | 1/2″ | 1/2″ – 14 Female NPTF | Steel | 2.37″ (60.2mm) |
1.65″ (41.9mm) |
1-1/2″ |
| ST4F4-SS | Plug/Male | 1/2″ | 1/2″ – 14 Female NPTF | 316 Stainless | 2.37″ (60.2mm) |
1.65″ (41.9mm) |
1-1/2″ |
| ST4BF4 | Plug/Male | 1/2″ | 1/2″ – 14 Female BSPP | Steel | 2.37″ (60.2mm) |
1.65″ (41.9mm) |
1-1/2″ |
| ST4BF4-SS | Plug/Male | 1/2″ | 1/2″ – 14 Female BSPP | 316 Stainless | 2.37″ (60.2mm) |
1.65″ (41.9mm) |
1-1/2″ |
| ST4OF4 | Plug/Male | 1/2″ | 3/4″ – 16 Female ORB | Steel | 2.37″ (60.2mm) |
1.65″ (41.9mm) |
1-1/2″ |
| ST6F6 | Plug/Male | 3/4″ | 3/4″ – 14 Female NPTF | Steel | 2.96″ (75.2mm) |
1.92″ (48.8mm) |
1-3/4″ |
| ST6F6-SS | Plug/Male | 3/4″ | 3/4″ – 14 Female NPTF | 316 Stainless | 2.96″ (75.2mm) |
1.92″ (48.8mm) |
1-3/4″ |
| ST6BF6 | Plug/Male | 3/4″ | 3/4″ – 14 Female BSPP | Steel | 2.96″ (75.2mm) |
1.92″ (48.8mm) |
1-3/4″ |
| ST6BF6-SS | Plug/Male | 3/4″ | 3/4″ – 14 Female BSPP | 316 Stainless | 2.96″ (75.2mm) |
1.92″ (48.8mm) |
1-3/4″ |
| ST6OF6 | Plug/Male | 3/4″ | 1-1/16″ – 12 Female ORB | Steel | 2.96″ (75.2mm) |
1.92″ (48.8mm) |
1-3/4″ |
| ST8F8 | Plug/Male | 1″ | 1″ – 11-1/2 Female NPTF | Steel | 3.22″ (81.8mm) |
2.10″ (53.3mm) |
1-7/8″ |
| ST8F8-SS | Plug/Male | 1″ | 1″ – 11-1/2 Female NPTF | 316 Stainless | 3.22″ (81.8mm) |
2.10″ (53.3mm) |
1-7/8″ |
| ST8BF8 | Plug/Male | 1″ | 1″ – 11 Female BSPP | Steel | 3.22″ (81.8mm) |
2.10″ (53.3mm) |
1-7/8″ |
| ST8BF8-SS | Plug/Male | 1″ | 1″ – 11 Female BSPP | 316 Stainless | 3.22″ (81.8mm) |
2.10″ (53.3mm) |
1-7/8″ |
| ST8OF8 | Plug/Male | 1″ | 1-5/16″ – 12 Female ORB | Steel | 3.22″ (81.8mm) |
2.10″ (53.3mm) |
1-7/8″ |
| ST8F10 | Plug/Male | 1″ | 1-1/4″ – 11-1/2 Female NPTF | Steel | 3.48″ (88.4mm) |
2.20″ (55.9mm) |
2″ |
| ST8F10-SS | Plug/Male | 1″ | 1-1/4″ – 11-1/2 Female NPTF | 316 Stainless | 3.48″ (88.4mm) |
2.20″ (55.9mm) |
2″ |
| ST8BF10 | Plug/Male | 1″ | 1-1/4″ – 11 Female BSPP | Steel | 3.48″ (88.4mm) |
2.20″ (55.9mm) |
2″ |
| ST8BF10-SS | Plug/Male | 1″ | 1-1/4″ – 11 Female BSPP | 316 Stainless | 3.48″ (88.4mm) |
2.20″ (55.9mm) |
2″ |
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| ST16F12 | Plug/Male | 2″ | 1-1/2″ – 11-1/2 Female NPTF | Steel | 4.50″ (114.3mm) |
3.48″ (88.4mm) |
3-1/4″ |
| ST16BF12 | Plug/Male | 2″ | 1-1/2″ – 11 Female BSPP | Steel | 4.50″ (114.3mm) |
3.48″ (88.4mm) |
3-1/4″ |
| ST16OF12 | Plug/Male | 2″ | 1-7/8″ – 12 Female ORB | Steel | 4.50″ (114.3mm) |
3.48″ (88.4mm) |
3-1/4″ |
| ST16F16 | Plug/Male | 2″ | 2″ – 11-1/2 Female NPTF | Steel | 4.50″ (114.3mm) |
3.48″ (88.4mm) |
3-1/4″ |
| ST16F16-SS | Plug/Male | 2″ | 2″ – 11-1/2 Female NPTF | 316 Stainless | 4.50″ (114.3mm) |
3.48″ (88.4mm) |
3-1/4″ |
| ST16BF16 | Plug/Male | 2″ | 2″ – 11 Female BSPP | Steel | 4.50″ (114.3mm) |
3.48″ (88.4mm) |
3-1/4″ |
| ST16OF16 | Plug/Male | 2″ | 2-1/2″ – 12 Female ORB | Steel | 4.50″ (114.3mm) |
3.48″ (88.4mm) |
3-1/4″ |
| ST-Series | Heavy-Duty Flushface ‘Old Style’ Plug (Female Threads) | |||||||
|---|---|---|---|---|---|---|---|
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| Part Number |
Coupling Type |
Body Size |
Threads | Material | Length | Max. OD |
Hex |
| ST8F8-V2 | Plug/Male | 1″ | 1″ – 11-1/2 Female NPTF | Steel | 3.26″ (82.8mm) |
1.92″ (48.8mm) |
1-3/4″ |
| ST8BF8-V2 | Plug/Male | 1″ | 1″ – 11 Female BSPP | Steel | 3.26″ (82.8mm) |
1.92″ (48.8mm) |
1-3/4″ |
| ST8F10-V2 | Plug/Male | 1″ | 1-1/4″ – 11-1/2 Female NPTF | Steel | 3.50″ (88.9mm) |
1.98″ (50.3mm) |
2″ |
| ST-Series | Heavy-Duty Flushface Coupler (Female Threads) | |||||||
|---|---|---|---|---|---|---|---|
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| Part Number |
Coupling Type |
Body Size |
Threads | Material | Length | Max. OD |
Hex |
| 2STF2 | Socket/Female | 1/4″ | 1/4″ – 18 Female NPTF | Steel | 1.96″ (49.8mm) |
1.23″ (31.2mm) |
15/16″ |
| 2STF2-SS | Socket/Female | 1/4″ | 1/4″ – 18 Female NPTF | 316 Stainless | 1.96″ (49.8mm) |
1.23″ (31.2mm) |
15/16″ |
| 2STBF2 | Socket/Female | 1/4″ | 1/4″ – 19 Female BSPP | Steel | 1.96″ (49.8mm) |
1.23″ (31.2mm) |
15/16″ |
| 2STBF2-SS | Socket/Female | 1/4″ | 1/4″ – 19 Female BSPP | 316 Stainless | 1.96″ (49.8mm) |
1.23″ (31.2mm) |
15/16″ |
| 3STF2 | Socket/Female | 3/8″ | 1/4″ – 18 Female NPTF | Steel | 2.36″ (59.9mm) |
1.60″ (40.6mm) |
1-3/16″ |
| 3STF3 | Socket/Female | 3/8″ | 3/8″ – 18 Female NPTF | Steel | 2.36″ (59.9mm) |
1.60″ (40.6mm) |
1-3/16″ |
| 3STF3-SS | Socket/Female | 3/8″ | 3/8″ – 18 Female NPTF | 316 Stainless | 2.36″ (59.9mm) |
1.60″ (40.6mm) |
1-3/16″ |
| 3STBF3 | Socket/Female | 3/8″ | 3/8″ – 19 Female BSPP | Steel | 2.36″ (59.9mm) |
1.60″ (40.6mm) |
1-3/16″ |
| 3STBF3-SS | Socket/Female | 3/8″ | 3/8″ – 19 Female BSPP | 316 Stainless | 2.36″ (59.9mm) |
1.60″ (40.6mm) |
1-3/16″ |
| 3STF4 | Socket/Female | 3/8″ | 1/2″ – 14 Female NPTF | Steel | 2.36″ (59.9mm) |
1.60″ (40.6mm) |
1-3/16″ |
| 3STBF4 | Socket/Female | 3/8″ | 1/2″ – 14 Female BSPP | Steel | 2.36″ (59.9mm) |
1.60″ (40.6mm) |
1-3/16″ |
| 3STBF4-SS | Socket/Female | 3/8″ | 1/2″ – 14 Female BSPP | 316 Stainless | 2.36″ (59.9mm) |
1.60″ (40.6mm) |
1-3/16″ |
| 4STF4 | Socket/Female | 1/2″ | 1/2″ – 14 Female NPTF | Steel | 2.77″ (70.4mm) |
1.98″ (50.3mm) |
1-1/2″ |
| 4STF4-SS | Socket/Female | 1/2″ | 1/2″ – 14 Female NPTF | 316 Stainless | 2.77″ (70.4mm) |
1.98″ (50.3mm) |
1-1/2″ |
| 4STBF4 | Socket/Female | 1/2″ | 1/2″ – 14 Female BSPP | Steel | 2.77″ (70.4mm) |
1.98″ (50.3mm) |
1-1/2″ |
| 4STBF4-SS | Socket/Female | 1/2″ | 1/2″ – 14 Female BSPP | 316 Stainless | 2.77″ (70.4mm) |
1.98″ (50.3mm) |
1-1/2″ |
| 4STOF4 | Socket/Female | 1/2″ | 3/4″ – 16 Female ORB | Steel | 2.77″ (70.4mm) |
1.98″ (50.3mm) |
1-1/2″ |
| 6STF6 | Socket/Female | 3/4″ | 3/4″ – 14 Female NPTF | Steel | 3.03″ (77.0mm) |
2.35″ (59.7mm) |
1-3/4″ |
| 6STF6-SS | Socket/Female | 3/4″ | 3/4″ – 14 Female NPTF | 316 Stainless | 3.03″ (77.0mm) |
2.35″ (59.7mm) |
1-3/4″ |
| 6STBF6 | Socket/Female | 3/4″ | 3/4″ – 14 Female BSPP | Steel | 3.03″ (77.0mm) |
2.35″ (59.7mm) |
1-3/4″ |
| 6STBF6-SS | Socket/Female | 3/4″ | 3/4″ – 14 Female BSPP | 316 Stainless | 3.03″ (77.0mm) |
2.35″ (59.7mm) |
1-3/4″ |
| 6STOF6 | Socket/Female | 3/4″ | 1-1/16″ – 12 Female ORB | Steel | 3.03″ (77.0mm) |
2.35″ (59.7mm) |
1-3/4″ |
| 8STF8 | Socket/Female | 1″ | 1″ – 11-1/2 Female NPTF | Steel | 3.33″ (84.6mm) |
2.73″ (69.3mm) |
2″ |
| 8STF8-SS | Socket/Female | 1″ | 1″ – 11-1/2 Female NPTF | 316 Stainless | 3.33″ (84.6mm) |
1.55″ (39.3mm) |
2″ |
| 8STBF8 | Socket/Female | 1″ | 1″ – 11 Female BSPP | Steel | 3.33″ (84.6mm) |
2.73″ (69.3mm) |
2″ |
| 8STBF8-SS | Socket/Female | 1″ | 1″ – 11 Female BSPP | 316 Stainless | 3.33″ (84.6mm) |
2.73″ (69.3mm) |
2″ |
| 8STOF8 | Socket/Female | 1″ | 1″-5/16-12 Female ORB | Steel | 3.33″ (84.6mm) |
2.73″ (69.3mm) |
2″ |
| 8STF10 | Socket/Female | 1″ | 1-1/4″ – 11-1/2 Female NPTF | Steel | 3.67″ (93.2mm) |
2.73″ (69.3mm) |
2″ |
| 8STBF10 | Socket/Female | 1″ | 1-1/4″ – 11 Female BSPP | Steel | 3.67″ (93.2mm) |
2.73″ (69.3mm) |
2″ |
| 8STBF10-SS | Socket/Female | 1″ | 1-1/4″ – 11 Female BSPP | 316 Stainless | 3.67″ (93.2mm) |
2.73″ (69.3mm) |
2″ |
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| 16STF12 | Socket/Female | 2″ | 1-1/2″ – 11-1/2 Female NPTF | Steel | 6.20″ (157.5mm) |
4.47″ (113.5mm) |
3.78″ |
| 16STBF12 | Socket/Female | 2″ | 1-1/2″ – 11 Female BSPP | Steel | 6.20″ (157.5mm) |
4.47″ (113.5mm) |
3.78″ |
| 16STOF12 | Socket/Female | 2″ | 1-7/8″ – 12 Female ORB | Steel | 6.20″ (157.5mm) |
4.47″ (113.5mm) |
3.78″ |
| 16STF16 | Socket/Female | 2″ | 2″ – 11-1/2 Female NPTF | Steel | 6.20″ (157.5mm) |
4.47″ (113.5mm) |
3.78″ |
| 16STF16-SS | Socket/Female | 2″ | 2″ – 11-1/2 Female NPTF | 316 Stainless | 6.20″ (157.5mm) |
4.47″ (113.5mm) |
3.78″ |
| 16STBF16 | Socket/Female | 2″ | 2″ – 11 Female BSPP | Steel | 6.20″ (157.5mm) |
4.47″ (113.5mm) |
3.78″ |
| 16STOF16 | Socket/Female | 2″ | 2-1/2″ – 12 Female ORB | Steel | 6.20″ (157.5mm) |
4.47″ (113.5mm) |
3.78″ |
| ST-Series | Heavy-Duty Flushface ‘Old Style’ Coupler (Female Threads) | |||||||
|---|---|---|---|---|---|---|---|
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| Part Number |
Coupling Type |
Body Size |
Threads | Material | Length | Max. OD |
Hex |
| 8STF8-V2 | Socket/Female | 1″ | 1″ – 11-1/2 Female NPTF | Steel | 4.55″ (115.6mm) |
2.74″ (69.6mm) |
2″ |
| 8STBF8-V2 | Socket/Female | 1″ | 1″ – 11 Female BSPP | Steel | 4.55″ (115.6mm) |
2.74″ (69.6mm) |
2″ |
| 8STF10-V2 | Socket/Female | 1″ | 1-1/4″ – 11-1/2 Female NPTF | Steel | 4.90″ (124.5mm) |
2.74″ (69.6mm) |
2″ |









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