Total 424 elbow sch40 factories & companies found with 1,272 products. Source high quality elbow sch40 from our great selection of reliable elbow sch40 manufacturing factories.
Wenzhou Best Valve & Pipe Fitting Co.,Ltd
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory |
Main Products: | Stainless Steel Ball Valve , Gate Valve , Globe Valve , Camlock Coupling , Sanitary Pipe Fitting |
Mgmt. Certification: |
ISO 9001
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, ODM, Own Brand |
Location: | Wenzhou, Zhejiang |
-
Unit Price: US$ 15 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 15 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 15 / PieceMin. Order: 1 Piece
Hebei Jinmai Casting Co., Ltd.
![China Supplier - Gold Member](https://www.micstatic.com/common/img/icon/gold-member.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | Malleable Iron Pipe Fitting , Pipe Products , Pipe Nipple , Gi Fitting , Pipe Fitting |
Mgmt. Certification: |
ISO 9001, ISO 14001
|
Factory ownership: | Limited Company |
R&D Capacity: | Own Brand |
Location: | Shijiazhuang, Hebei |
-
Unit Price: US$ 0.18 / PieceMin. Order: 100 Pieces
-
Unit Price: US$ 0.18 / PieceMin. Order: 100 Pieces
-
Unit Price: US$ 0.18 / PieceMin. Order: 100 Pieces
Qingdao Fluido Industrial Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory |
Main Products: | Cast Iron Valve , Cast Steel Valve , Ball Valve , Forged Flange , Ductile Iron Pipe Fitting |
Mgmt. Certification: |
ISO 9001, ISO 14001
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, ODM, Own Brand |
Location: | Qingdao, Shandong |
-
ANSI B16.9 Stainless Steel Carbon Steel Xs Sch40 Sch80 Sch120 Butt Welding Pipe Fittings Lr Sr ElbowANSI B16.9 Stainless Steel Carbon Steel Xs Sch40 Sch80 Sch120 Butt Welding Pipe Fittings Lr Sr ElbowUnit Price: US$ 1-10 / PieceMin. Order: 500 Pieces
-
Unit Price: US$ 1 / PieceMin. Order: 100 Pieces
-
Unit Price: US$ 0.2-30 / PieceMin. Order: 100 Pieces
Ningbo Qianxiang Huiya International Trade Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | PVC Valve , PVC Ball Valve , Two PCS PVC Valve , PVC Butterfly Valve , PVC Pipe Fittings |
Mgmt. Certification: |
ISO 9001, ISO 14001, ISO 14064
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, ODM, Own Brand |
Location: | Ningbo, Zhejiang |
-
Unit Price: US$ 0.098-0.1 / PieceMin. Order: 1000 Pieces
-
Unit Price: US$ 0.098-0.1 / PieceMin. Order: 1000 Pieces
-
Unit Price: US$ 0.098-0.1 / PieceMin. Order: 1000 Pieces
Cangzhou Datang Steel Pipe Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory |
Main Products: | Fin Tube , Fin Tube Heat Exchanger , Air Cooler , Fin Tube Radiator , Shell and Tube Condenser |
Mgmt. Certification: |
ISO 9001, ISO 14001, ASME
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, ODM |
Location: | Cangzhou, Hebei |
-
Unit Price: US$ 1-1000 / PieceMin. Order: 1 Meter
-
Unit Price: US$ 1-1000 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 1-1000 / PieceMin. Order: 1 Piece
Hongxing Manufacturing Group Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory |
Main Products: | Valve , Fitting , Dzr Brass , Lead Free , Sanitary Ware |
Mgmt. Certification: |
ISO 9001, ISO 14001
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, ODM, Own Brand |
Location: | Taizhou, Zhejiang |
-
Unit Price: US$ 0.5-2 / PieceMin. Order: 1000 Pieces
-
Unit Price: US$ 0.5-2 / PieceMin. Order: 1000 Pieces
-
Unit Price: US$ 0.5-2 / PieceMin. Order: 1000 Pieces
Guangdong Ctube Industry Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory |
Main Products: | PVC Conduit , PVC Conduit Fittings , Rigid Conduit , Flexible Conduit , Plastic Conduit |
Mgmt. Certification: |
ISO 9001, ISO 14001
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, ODM, Own Brand |
Location: | Dongguan, Guangdong |
-
Unit Price: US$ 0.3-8.6 / PieceMin. Order: 2000 Pieces
-
Unit Price: US$ 1.19-59.99 / PieceMin. Order: 500 Pieces
-
Unit Price: US$ 0.36-8.6 / PieceMin. Order: 2000 Pieces
Zhejiang Tianyan Holding Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | CPVC D2846 , PPR , CPVC Elbow , Plastic , PVC Pipe |
Mgmt. Certification: |
ISO9001:2015, ISO14001:2015
|
Factory ownership: | Limited Company |
R&D Capacity: | ODM, OEM, Own Brand |
Location: | Taizhou, Zhejiang |
-
Unit Price: US$ 0.063 / Carton/CartonsMin. Order: 10 Carton/Cartons
-
Unit Price: US$ 0.02 / Carton/CartonsMin. Order: 10 Carton/Cartons
-
Unit Price: US$ 0.235 / PieceMin. Order: 1000 Pieces
TIANJIN BOER KING STEEL CO., LIMITED
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Group Corporation |
Main Products: | Seamless Steel Pipe , Boiler Tube , Casing Pipe , Alloy Steel Pipe |
Factory ownership: | Limited Company |
R&D Capacity: | OEM, ODM, Own Brand |
Location: | Tianjin, Tianjin |
Production Lines: | 5 |
-
Unit Price: US$ 0.5-10 / PieceMin. Order: 10 Pieces
-
Unit Price: US$ 5 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 5 / PieceMin. Order: 1 Piece
TIANJIN FRIEND STEEL TUBE CO., LTD.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory |
Main Products: | Galvanized Pipe , Steel Board , Scaffold Tube , Steel Prop , Steel Frame |
Mgmt. Certification: |
ISO9001:2015, ISO14001:2015, ISO45001:2016
|
Factory ownership: | Limited Company |
R&D Capacity: | ODM, OEM |
Location: | Tianjin, Tianjin |
-
Min. Order: 20 Pieces
-
Min. Order: 20 Pieces
Zhejiang Ifan Piping Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | ppr fittings , pvc fittings , brass fittings , ppr pipe , pvc pipe |
Mgmt. Certification: |
ISO9001:2015, ISO14001:2015
|
Factory ownership: | Limited Company |
R&D Capacity: | ODM |
Location: | Shaoxing, Zhejiang |
-
Unit Price: US$ 0.01-0.06 / PieceMin. Order: 1200 Pieces
-
Unit Price: US$ 0.01-0.06 / PieceMin. Order: 1200 Pieces
-
Ifanplus Fittings Wholesale Good Price UPVC Fittings Elbow Tee Suppot Customation Sch40 PVC FittingsIfanplus Fittings Wholesale Good Price UPVC Fittings Elbow Tee Suppot Customation Sch40 PVC FittingsUnit Price: US$ 0.08-0.09 / PieceMin. Order: 320 Pieces
Shaanxi Jiade Import and Export Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Trading Company |
Main Products: | Seamless Steel Pipes , Welded Steel Pipes , Steel Pipe Fittings , Flanges |
Mgmt. Certification: |
ISO 9001
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, ODM, Own Brand |
Location: | Xi'an, Shaanxi |
-
Unit Price: US$ 11-15 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 11-15 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 1-1.2 / PieceMin. Order: 1 Piece
HEBEI HONGCHENG PIPE FITTINGS CO., LIMITED
![China Supplier - Gold Member](https://www.micstatic.com/common/img/icon/gold-member.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | Pipe Fitting , Flange , Valve , Carbon Steel Pipe , Gasket |
Mgmt. Certification: |
ISO 9001, ISO 14001, OHSAS/ OHSMS 18001, HSE, ASME...
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, ODM |
Location: | Shanghai, Shanghai |
-
Unit Price: US$ 0.45-100 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 0.45-100 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 1 / PieceMin. Order: 1 Piece
Hebei Yaosheng Im & Ex Trading Co., Ltd
![China Supplier - Gold Member](https://www.micstatic.com/common/img/icon/gold-member.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | Gate Valve , Ball Valve , Butterfly Valve , Globe Valve , Check Valve |
Mgmt. Certification: |
ISO 9001
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, ODM, Own Brand |
Location: | Baoding, Hebei |
-
Unit Price: US$ 4-4.5 / PieceMin. Order: 20 Pieces
-
Unit Price: US$ 4-4.5 / PieceMin. Order: 20 Pieces
-
Unit Price: US$ 4-4.5 / PieceMin. Order: 20 Pieces
EZ Steel Industrial Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory |
Main Products: | Carbon Steel Pipe , Stainless Steel Pipe , Copper Nickel Tube , Heat Exchanger Tube , Boiler Tube |
Mgmt. Certification: |
ISO 9001, ISO 14001, OHSAS/ OHSMS 18001, ANSI/ESD, ASME
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, Own Brand |
Location: | Changsha, Hunan |
-
Unit Price: US$ 40 / PieceMin. Order: 5 Pieces
-
Unit Price: US$ 40 / PieceMin. Order: 5 Pieces
-
Unit Price: US$ 10 / PieceMin. Order: 5 Pieces
SYI Industrial Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | manhole cover , grating , ductile iron pipe fitting , adapter and coupling , valve |
Mgmt. Certification: |
ISO9001:2015
|
Factory ownership: | Limited Company |
R&D Capacity: | Own Brand, ODM, OEM |
Location: | Taiyuan, Shanxi |
-
Unit Price: US$ 5-9 / PieceMin. Order: 100 Pieces
-
Unit Price: US$ 5-9 / PieceMin. Order: 100 Pieces
-
Unit Price: US$ 5-9 / PieceMin. Order: 100 Pieces
ANQING GREAT WALL PIPELINE CO., LTD.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Trading Company |
Main Products: | Hot Tapping Machine , Pipe Cutting Machine , Flange Adaptor , Repair Clamps , Stainless Steel Croved Coupling |
Mgmt. Certification: |
ISO 9001, ISO 14001, OHSAS/ OHSMS 18001
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM |
Location: | Anqing, Anhui |
-
Unit Price: US$ 1 / PieceMin. Order: 10 Pieces
-
Unit Price: US$ 1 / PieceMin. Order: 10 Pieces
-
Unit Price: US$ 1 / PieceMin. Order: 10 Pieces
Jiangsu Rylision Steel Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | Stainless Steel Sheet , Stainless Steel Plate , Stainless Steel Pipe , Stainless Steel Tube , Stainless Steel Coil |
Mgmt. Certification: |
ISO 9001, BSCI, ANSI/ESD, ASME
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, ODM |
Location: | Wuxi, Jiangsu |
-
Unit Price: US$ 0.5-2 / PieceMin. Order: 50 Pieces
-
Unit Price: US$ 0.5-2 / PieceMin. Order: 50 Pieces
-
Unit Price: US$ 0.5-2 / PieceMin. Order: 50 Pieces
RST VALVE GROUP CO., LTD.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | Industrial Valves |
Mgmt. Certification: |
ISO 9001, ISO 14001
|
Factory ownership: | Limited Company |
R&D Capacity: | Own Brand, ODM, OEM |
Location: | Wenzhou, Zhejiang |
-
Unit Price: US$ 1-1.2 / PieceMin. Order: 10 Pieces
-
Unit Price: US$ 1-1.2 / PieceMin. Order: 10 Pieces
-
Unit Price: US$ 1-1.2 / PieceMin. Order: 10 Pieces
Qingdao Eathu Import and Export Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | Forging Parts , Casting Parts , Lifting Anchor System , Metal OEM Parts , Agricultural Machinery Parts |
Mgmt. Certification: |
ISO 9001
|
R&D Capacity: | OEM, ODM, Own Brand |
Location: | Qingdao, Shandong |
Production Lines: | 8 |
-
Unit Price: US$ 1-1.2 / PieceMin. Order: 1000 Pieces
-
Unit Price: US$ 1-1.2 / PieceMin. Order: 1000 Pieces
-
Unit Price: US$ 1.2-1.5 / PieceMin. Order: 1000 Pieces
Hebei Shenhao Pipe Fittings Manufacturing Co., Ltd.
![China Supplier - Gold Member](https://www.micstatic.com/common/img/icon/gold-member.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | Elbows , Flangs , Pipe Caps , Tees , Threads |
Mgmt. Certification: |
ISO 9001, ISO 9000, ISO 14001, ISO 14000, ISO 20000...
|
Factory ownership: | Limited Company |
R&D Capacity: | ODM, OEM, Own Brand |
Location: | Cangzhou, Hebei |
-
Unit Price: US$ 50 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 50 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 50 / PieceMin. Order: 1 Piece
Tobo Industrial (shanghai) Co.,Ltd
![China Supplier - Gold Member](https://www.micstatic.com/common/img/icon/gold-member.png?_v=1719285595514)
Business Type: | Trading Company |
Main Products: | Super duplex steel fittings flanges; Copper nickel fittings; Nickel alloy pipe/tube; Super duplex steel pipes/tubes; Copper nickel plate/ sheet |
Factory ownership: | Limited Company |
R&D Capacity: | ODM, OEM |
Location: | Shanghai, Shanghai |
Production Lines: | 6 |
-
Unit Price: US$ 1-10 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 6.59-7.99 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 6.59-7.99 / PieceMin. Order: 1 Piece
Zhejiang Tianyan Holding Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | Pipe; Pipe Fitting; Valve; Faucet |
Mgmt. Certification: |
ISO 9001, ISO 14001, OHSAS/ OHSMS 18001, WRAP
|
Factory ownership: | Limited Company |
R&D Capacity: | ODM, OEM, Own Brand |
Location: | Taizhou, Zhejiang |
-
Unit Price: US$ 100-200 / BoxMin. Order: 5 Boxes
-
Unit Price: US$ 0.03-0.1 / BoxMin. Order: 5 Boxes
-
Unit Price: US$ 1.1-39 / BoxMin. Order: 5 Boxes
Shangdian Flange Pipe Fittings Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | Stainless Steel Flange , Pipe Fittings , Valve |
Mgmt. Certification: |
ISO9001:2015
|
Factory ownership: | Limited Company |
Location: | Wenzhou, Zhejiang |
Production Lines: | Above 10 |
-
Unit Price: US$ 2.5-3 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 2.5-3 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 2.5-3 / PieceMin. Order: 1 Piece
Yangzhou Huawei Pipe Technology Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | Cable Protective Pipe(MPP) , Plastic Cable Protective Pipe |
Mgmt. Certification: |
ISO9001:2015, ISO14001:2015
|
Factory ownership: | Limited Company |
R&D Capacity: | ODM, OEM, Own Brand |
Location: | Yangzhou, Jiangsu |
-
Unit Price: US$ 0.2-28 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 0.2-28 / PieceMin. Order: 1 Piece
-
Unit Price: US$ 0.2-28 / PieceMin. Order: 1 Piece
JINAN ICM INDUSTRIES VALVES & FITTINGS CO., LTD
![China Supplier - Gold Member](https://www.micstatic.com/common/img/icon/gold-member.png?_v=1719285595514)
Business Type: | Manufacturer/Factory |
Main Products: | Camlock Fittings , Pipe Nipple , Fire Hose Coupling , Hose Coupling , Bauer Coupling |
Mgmt. Certification: |
ISO 9001
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM |
Location: | Jinan, Shandong |
-
Unit Price: US$ 1-2 / PieceMin. Order: 200 Pieces
-
Unit Price: US$ 2-5 / PieceMin. Order: 200 Pieces
-
Unit Price: US$ 2-5 / PieceMin. Order: 200 Pieces
Ningbo Salvador Piping System Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Trading Company |
Main Products: | Plastic Valve , Plastic Fittings , Brass Fittings |
Mgmt. Certification: |
ISO 9001, ISO 14001
|
Factory ownership: | Private Owner |
R&D Capacity: | OEM |
Location: | Ningbo, Zhejiang |
-
Unit Price: US$ 1.259 / PieceMin. Order: 5000 Pieces
-
Unit Price: US$ 1.259 / PieceMin. Order: 5000 Pieces
-
Unit Price: US$ 1.259 / PieceMin. Order: 5000 Pieces
HEFEI ELECMAN ELECTRICAL CO., LTD.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | EMT Conduit , IMC Pipes , EMT Connector , EMT Couplings , Rigid Conduit |
Mgmt. Certification: |
ISO 9001
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, ODM, Own Brand |
Location: | Hefei, Anhui |
-
Unit Price: US$ 0.528-10 / PieceMin. Order: 100 Pieces
-
Unit Price: US$ 0.69-10 / PieceMin. Order: 100 Pieces
-
Unit Price: US$ 0.25-10 / PieceMin. Order: 100 Pieces
Qingdao Ironsteel International Trading Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory , Trading Company |
Main Products: | Steel Pipe , PPGI Coil/Sheet , PPGI Roofing Sheet , Galvanized Steel Coil , Galvanized Steel Sheet |
Mgmt. Certification: |
ISO 9001, ISO 14001, IATF16949, HSE, ANSI/ESD...
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, Own Brand |
Location: | Qingdao, Shandong |
-
Unit Price: US$ 8-10 / PieceMin. Order: 5 Pieces
-
Unit Price: US$ 40-50 / PieceMin. Order: 5 Pieces
-
Unit Price: US$ 30-35 / PieceMin. Order: 5 Pieces
Shanxi Midas Industrial Co., Ltd.
![China Supplier - Diamond Member](https://www.micstatic.com/common/img/icon/diamond_member_16.png?_v=1719285595514)
Business Type: | Manufacturer/Factory |
Main Products: | Ductile Iron Pipe and Fitting , Steel Pipe and Fitting , Valve , Manhole Cover , Coupling |
Mgmt. Certification: |
ISO 9001, ISO 9000, ISO 14001, ISO 14000, ISO 20000...
|
Factory ownership: | Limited Company |
R&D Capacity: | OEM, ODM, Own Brand |
Location: | Taiyuan, Shanxi |
-
Unit Price: US$ 900 / TonMin. Order: 1 Ton
-
Unit Price: US$ 950-1000 / TonMin. Order: 100 Tons
-
Unit Price: US$ 950-1000 / TonMin. Order: 100 Tons