Measure the threaded ends of your fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.
Butt-Weld Fittings for Stainless Steel Tubing
- For Use With: See table
- Temperature Range: See table
- Tubing:
304 Stainless Steel: Use with 304/304L stainless steel that meets ASTM A213, ASTM A269, or ASTM A270, except DIN EN 10357 fittings with only ASTM A269 or ASTM A270
316 Stainless Steel: Use with 316/316L stainless steel that meets ASTM A213, ASTM A269, or ASTM A270, except ASME BPE and DIN EN 10357 fittings with only ASTM A269 or ASTM A270 - Specifications Met: See table
Weld these fittings to tubing for a permanent, flush connection that permits smooth flow through a line.
304/304L stainless steel fittings have very good corrosion resistance. 316/316L stainless steel fittings have excellent corrosion resistance.
ASME BPE fittings are polished to a 20 Ra finish for an extra-smooth interior that prevents product buildup and bacteria growth. Use them in pharmaceutical and bioprocessing applications.


| For Tube OD (A) | For Tube OD (B) | Max. Pressure | Max. Vacuum | Temp. Range, °F | Wall Thick. | For Use With | Specifications Met | Each | ||
Polished | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1" | 3/4" | 200 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K943 | 000000 |
| 1 | 1 1/2" | 1" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K42 | 00000 |
| 1 | 2" | 1" | 200 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K944 | 00000 |
| 1 | 2" | 1 1/2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K43 | 00000 |
| 1 | 2 1/2" | 1 1/2" | 450 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K44 | 00000 |
| 1 | 2 1/2" | 2" | 450 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K45 | 00000 |
| 1 | 3" | 1 1/2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K46 | 00000 |
| 1 | 3" | 2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K47 | 00000 |
| 1 | 3" | 2 1/2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K48 | 00000 |
| 1 | 4" | 3" | 250 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.083" | Dairy, Food | 3-A Certified 63-04 | 44655K54 | 00000 |
| 1 | 6" | 4" | 125 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.109" | Dairy, Food | 3-A Certified 63-04 | 44655K69 | 000000 |
Dull | ||||||||||
| 1 | 1 1/2" | 1" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K41 | 00000 |
| 1 | 2" | 1" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K42 | 00000 |
| 1 | 2" | 1 1/2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K43 | 00000 |
| 1 | 2 1/2" | 1 1/2" | 450 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K44 | 00000 |
| 1 | 2 1/2" | 2" | 450 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K45 | 00000 |
| 1 | 3" | 1 1/2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K46 | 00000 |
| 1 | 3" | 2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K47 | 00000 |
| 1 | 3" | 2 1/2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K48 | 00000 |
| 1 | 4" | 3" | 250 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K52 | 00000 |
| 1 | 6" | 4" | 120 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.083" | Air, Food, Water | __ | 44675K73 | 000000 |
| For Tube OD (A) | For Tube OD (B) | Max. Pressure | Max. Vacuum | Temp. Range, °F | Wall Thick. | For Use With | Specifications Met | Certification | Each | ||
Polished | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1" | 1/2" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | __ | 5237K442 | 000000 |
| 1 | 1" | 3/4" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | __ | 5237K443 | 00000 |
| 1 | 1 1/2" | 1" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | __ | 5237K42 | 00000 |
| 1 | 2" | 1 1/2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | __ | 5237K43 | 00000 |
| 1 | 2 1/2" | 1 1/2" | 450 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | __ | 5237K44 | 00000 |
| 1 | 2 1/2" | 2" | 450 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | __ | 5237K45 | 00000 |
| 1 | 3" | 1 1/2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | __ | 5237K46 | 00000 |
| 1 | 3" | 2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | __ | 5237K47 | 00000 |
| 1 | 3" | 2 1/2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | __ | 5237K48 | 00000 |
| 1 | 4" | 3" | 250 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.083" | Dairy, Food | 3-A Certified 63-04 | __ | 5237K54 | 00000 |
| 2 | 1/2" | 3/8" | 200 psi @ 72° F | __ | -65° to 200° | 0.065" | Air, Deionized Water, Pharmaceuticals, Water | ASME BPE | Material Certificate with Traceable Lot Number and Test Report | 44655K961 | 000000 |
| 2 | 3/4" | 1/4" | 200 psi @ 72° F | __ | -65° to 200° | 0.065" | Air, Deionized Water, Pharmaceuticals, Water | ASME BPE | Material Certificate with Traceable Lot Number and Test Report | 44655K962 | 000000 |
| 2 | 3/4" | 1/2" | 200 psi @ 72° F | __ | -65° to 250° | 0.065" | Air, Deionized Water, Pharmaceuticals, Water | ASME BPE | Material Certificate with Traceable Lot Number and Test Report | 4746K21 | 000000 |
| 2 | 1" | 1/2" | 200 psi @ 72° F | __ | -65° to 200° | 0.065" | Air, Deionized Water, Pharmaceuticals, Water | ASME BPE | Material Certificate with Traceable Lot Number and Test Report | 44655K963 | 000000 |
| 2 | 1" | 3/4" | 200 psi @ 72° F | __ | -65° to 250° | 0.065" | Air, Deionized Water, Pharmaceuticals, Water | ASME BPE | Material Certificate with Traceable Lot Number and Test Report | 4746K22 | 000000 |
| 2 | 1 1/2" | 1/2" | 200 psi @ 72° F | __ | -65° to 200° | 0.065" | Air, Deionized Water, Pharmaceuticals, Water | ASME BPE | Material Certificate with Traceable Lot Number and Test Report | 44655K964 | 000000 |
| 2 | 1 1/2" | 3/4" | 200 psi @ 72° F | __ | -65° to 200° | 0.065" | Air, Deionized Water, Pharmaceuticals, Water | ASME BPE | Material Certificate with Traceable Lot Number and Test Report | 44655K965 | 000000 |
| 2 | 1 1/2" | 1" | 200 psi @ 72° F | __ | -65° to 250° | 0.065" | Air, Deionized Water, Pharmaceuticals, Water | ASME BPE | Material Certificate with Traceable Lot Number and Test Report | 4746K23 | 000000 |
| 2 | 2" | 1" | 200 psi @ 72° F | __ | -65° to 200° | 0.065" | Air, Deionized Water, Pharmaceuticals, Water | ASME BPE | Material Certificate with Traceable Lot Number and Test Report | 44655K966 | 000000 |
| 2 | 2" | 1 1/2" | 200 psi @ 72° F | __ | -65° to 250° | 0.065" | Air, Deionized Water, Pharmaceuticals, Water | ASME BPE | Material Certificate with Traceable Lot Number and Test Report | 4746K24 | 000000 |
| 2 | 2 1/2" | 2" | 200 psi @ 72° F | __ | -65° to 200° | 0.065" | Air, Deionized Water, Pharmaceuticals, Water | ASME BPE | Material Certificate with Traceable Lot Number and Test Report | 44655K967 | 000000 |
| 2 | 3" | 2" | 200 psi @ 72° F | __ | -65° to 200° | 0.065" | Air, Deionized Water, Pharmaceuticals, Water | ASME BPE | Material Certificate with Traceable Lot Number and Test Report | 44655K968 | 000000 |
| 2 | 3" | 2 1/2" | 200 psi @ 72° F | __ | -65° to 200° | 0.065" | Air, Deionized Water, Pharmaceuticals, Water | ASME BPE | Material Certificate with Traceable Lot Number and Test Report | 44655K969 | 000000 |
Dull | |||||||||||
| 1 | 1" | 1/2" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | __ | 5237K444 | 00000 |
| 1 | 1" | 3/4" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | __ | 5237K445 | 00000 |
| 1 | 1 1/2" | 1" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | __ | 5237K411 | 00000 |
| 1 | 2" | 1" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | __ | 5237K421 | 00000 |
| 1 | 2" | 1 1/2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | __ | 5237K431 | 00000 |
| 1 | 2 1/2" | 2" | 450 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | __ | 5237K451 | 00000 |
| 1 | 3" | 1 1/2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | __ | 5237K461 | 00000 |
| 1 | 3" | 2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | __ | 5237K471 | 00000 |
| 1 | 3" | 2 1/2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | __ | 5237K481 | 00000 |
| 1 | 4" | 3" | 250 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.083" | Air, Food, Water | __ | __ | 5237K521 | 00000 |
| 1 | 6" | 4" | 120 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.109" | Air, Food, Water | __ | __ | 5237K218 | 000000 |

Offset straight reducers are also known as eccentric reducers. They have offset centers so your line can drain.
| For Tube OD (A) | For Tube OD (B) | Max. Pressure | Max. Vacuum | Temp. Range, °F | Wall Thick. | For Use With | Specifications Met | Each | |
304/304L Stainless Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Polished | |||||||||
| 1 1/2" | 1" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K62 | 000000 |
| 2" | 1 1/2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K63 | 00000 |
| 2 1/2" | 2" | 450 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K65 | 00000 |
| 3" | 1 1/2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K66 | 00000 |
| 3" | 2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K67 | 00000 |
| 3" | 2 1/2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K68 | 00000 |
| 4" | 3" | 250 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.083" | Dairy, Food | 3-A Certified 63-04 | 44655K74 | 00000 |
Dull | |||||||||
| 1 1/2" | 1" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K61 | 00000 |
| 2" | 1" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K62 | 00000 |
| 2" | 1 1/2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K63 | 00000 |
| 2 1/2" | 2" | 450 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K65 | 00000 |
| 3" | 2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K67 | 00000 |
| 3" | 2 1/2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K68 | 00000 |
| 4" | 3" | 250 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K72 | 00000 |
| 6" | 4" | 120 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.083" | Air, Food, Water | __ | 44675K74 | 000000 |
316/316L Stainless Steel | |||||||||
Polished | |||||||||
| 1" | 1/2" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 5237K446 | 00000 |
| 1" | 3/4" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 5237K447 | 00000 |
| 1 1/2" | 1" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 5237K62 | 00000 |
| 2" | 1 1/2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 5237K63 | 00000 |
| 2 1/2" | 2" | 450 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 5237K65 | 00000 |
| 3" | 2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 5237K67 | 00000 |
| 3" | 2 1/2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 5237K68 | 00000 |
Dull | |||||||||
| 1" | 1/2" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 5237K448 | 00000 |
| 2" | 1 1/2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 5237K631 | 00000 |
| 4" | 3" | 250 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.083" | Air, Food, Water | __ | 5237K721 | 00000 |

Inline tees are also known as branch tees.
| For Tube OD (A) | For Tube OD (B) | Max. Pressure | Max. Vacuum | Temp. Range, °F | Wall Thick. | For Use With | Specifications Met | Each | |
304/304L Stainless Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Polished | |||||||||
| 1 1/2" | 1" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K71 | 000000 |
| 2" | 1" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K72 | 00000 |
| 2" | 1 1/2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K73 | 00000 |
| 3" | 2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 44655K75 | 000000 |
Dull | |||||||||
| 1 1/2" | 1" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K55 | 00000 |
| 2" | 1" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K56 | 00000 |
| 2" | 1 1/2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K75 | 00000 |
| 3" | 2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Air, Food, Water | __ | 44675K76 | 00000 |
316/316L Stainless Steel | |||||||||
Polished | |||||||||
| 1 1/2" | 1" | 600 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 5237K49 | 00000 |
| 2" | 1" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 5237K51 | 00000 |
| 2" | 1 1/2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 5237K52 | 00000 |
| 3" | 2" | 350 psi @ 72° F | 10 -6 torr @ 72° F | -65° to 250° | 0.065" | Dairy, Food | 3-A Certified 63-04 | 5237K53 | 000000 |

























