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Parker ST Series

For the complete product listing, please view Catalog 3800 - Quick Coupling Products (19.9 MB PDF).

ST Series Couplers

Non-Valved, Manual Sleeve

Parker ST Series Couplers

ST Series non-valved couplings provide maximum flow and low pressure drop. The smooth, open bore allows easy cleaning in applications where the same lines are used for more than one media.

Applications: High pressure water, steam washers, carpet cleaners

Features:

  • Steel nipples are case hardened for resistance to Brinelling
  • Functionally interchanges with similar straight-through design couplings
  • Standard Nitrile seals

ST Series Specifications

Body Size Rated Pressure Rated Pressure Rated Pressure Temperature Range Rated Flow
inches Brass Coupler/Nipple Brass Coupler/Steel Nipple 303 SS Coupler/Nipple (standard seals)
1/8 2500 2600 4200 -40° to +250° F 3
1/4 5200 5500 6700 -40° to +250° F 6
3/8 2700 3500 5500 -40° to +250° F 12
1/2 2200 2700 3000 -40° to +250° F 12
3/4 1700 2700 3000 -40° to +250° F 28
1 1200 2000 1700 -40° to +250° F 50
1-1/4 1700 --- --- -40° to +250° F 76
1-1/2 1400 --- --- -40° to +250° F 100

Couplers - Female Pipe Thread

Couplers - Female Pipe Thread Couplers - Female Pipe Thread
Body Size Part # Brass Part # 303 Stainless Port End Length Largest Diameter Wrench Flats Weight Brass Weight Stainless
inches (lbs.) (lbs.)
1/8 BST-1 SST-1 1/8-27 NPTF 1.060.69 0.56 0.06 0.05
1/4 BST-2 SST-2 1/4-18 NPTF 1.540.94 0.81 0.17 0.15
3/8 BST-3 SST-3 3/8-18 NPTF 1.641.16 1.00 0.26 0.24
1/2 BST-4 SST-4 1/2-14 NPTF 1.981.30 1.13 0.40 0.37
3/4 BST-6 SST-6 3/4-14 NPTF 2.151.66 1.44 0.62 0.57
1 BST-8 SST-8 1-11 1/2 NPTF 2.432.02 1.75 0.99 0.93
1-1/4 BST-10 --- 1 1/4-11 1/2 NPTF 2.442.51 2.00 1.38 ---
1-1/2 BST-12 --- 1 1/2-11 1/2 NPTF 2.883.00 2.50 2.43 ---

Couplers - Male Pipe Thread

Couplers - Male Pipe Thread Couplers - Male Pipe Thread
Body Size Part # Brass Part # 303 Stainless Port End Length Largest Diameter Wrench Flats Weight Brass Weight Stainless
inches (lbs.) (lbs.)
1/8 BST-1M SST-1M 1/8-27 NPTF 1.060.69 0.56 0.05 0.05
1/4 BST-2M SST-2M 1/4-18 NPTF 1.690.94 0.81 0.13 0.16
3/8 BST-3M SST-3M 3/8-18 NPTF 1.751.16 1.00 0.25 1.16
1/2 BST-4M SST-4M 1/2-14 NPTF 1.941.30 1.13 0.34 1.30
3/4 BST-6M SST-6M 3/4-14 NPTF 2.171.66 1.44 --- 1.66
1 BST-8M SST-8M 1-11 1/2 NPTF 2.532.02 1.75 0.85 2.02

Nipples - Female Pipe Thread

Nipples - Female Pipe Thread Nipples - Female Pipe Thread Nipples - Female Pipe Thread
Body Size Part # Brass Weight Part # Steel Weight Part # 303 Stainless Weight Length Largest Diameter Wrench Flats
inches (lbs.) (lbs.) (lbs.)
1/8 BST-N1 0.03 ST-N1 0.03SST-N1 0.02 0.98 0.65 0.56
1/4 BST-N2 0.07 ST-N2 0.07SST-N2 0.07 1.46 0.87 0.75
3/8 BST-N3 0.12 ST-N3 0.11SST-N3 0.11 1.62 1.59 0.08
1/2 BST-N4 0.23 ST-N4 0.21SST-N4 0.21 1.85 1.30 1.13
3/4 BST-N6 0.33 ST-N6 0.32SST-N6 0.32 2.15 1.59 1.38
1 BST-N8 0.52 ST-N8 0.49SST-N8 0.48 2.35 1.88 1.63
1-1/4 BST-N10 0.85 --- ------ --- 2.38 2.31 2.00
1-1/2 BST-N12 1.45 --- ------ --- 2.81 2.74 2.38

Nipples - Male Pipe Thread

Nipples - Male Pipe Thread Nipples - Male Pipe Thread Nipples - Male Pipe Thread
Body Size Part # Brass Weight Part # Steel Weight Part # 303 Stainless Weight Length Largest Diameter Wrench Flats
inches (lbs.) (lbs.) (lbs.)
1/8 BST-N1M 0.02 ST-N1M 0.02SST-N1M 0.02 1.04 0.51 0.44
1/4 BST-N2M 0.06 ST-N2M 0.05SST-N2M 0.05 1.53 0.65 0.56
3/8 BST-N3M 0.08 ST-N3M 0.07SST-N3M 0.08 1.69 0.79 0.69
1/2 BST-N4M 0.15 ST-N4M 0.13SST-N4M 0.13 1.94 1.01 0.88
3/4 BST-N6M 0.23 ST-N6M 0.21SST-N6M 0.22 2.19 1.23 1.06
1 BST-N8M 0.46 ST-N8M 0.43SST-N8M 0.43 2.51 1.59 1.38
1-1/4 BST-N10M 0.96 --- ------ --- 2.85 2.17 1.88
1-1/2 BST-N12M 1.46 --- ------ --- 3.25 2.45 2.13