ProductASME Socketweld threaded fittings union BrandRenaissance Pipe Fitting Inc SizesRefer the specification ConditionNew Rating45 based on 12 reviews priceStart from 20 USD Standard ANSIASME MSS JIS DIN BS etc TYPE Socket Weld SW amp Screwed SCRD NPT BSP BSPT RANGE Forged Fittings 15 NB to 100 NB in 2000 LBS 3000 LBS 6000 LBS 9000 LBS available with NACE MR 0175 Stainless Steel Forged Union Standard ASTM ASME ASA 182 Grade F 304 304L 304H 309S 309H 310S 310H 316 316TI 316H 316L 316LN 317 317L 321 321H 347 347H 904L Duplex Steel Forged Union Standard ASTM ASME ASA 182 Grade F 44 F 45 F51 F 53 F 55 F 60 F 61 Aluminium Forged Union Standard ASTM B247 B361 Grade 2024 6061 6063 6101 7075 Titanium Forged Union Standard ASTM B381 Grade Grade 1 Grade 2 Grade 4 Grade 5 Grade 6 Grade 7 Grade 9 Grade 19 Grade 23 Carbon Steel Forged Union Standard ASTM A 105A694 A350 LF3A350 LF2 Grade F42465256606570 Low Temperature Carbon Steel Forged Union Standard ASTM A 350 LF2 A350 LF3 Alloy Steel Forged Union Standard ASTM A182 Grade F1F5F9F11F22F91 Copper Alloy Forged Union Standard ASTM ASME SB 61 62 151 152 Grade UNS NO C 70600 CU NI 9010 C 71500 CU NI 7030 C 71640 Nickel Alloy Forged Union Standard ASTM ASME SB 564 160 472 Nickel 200 UNS N02200   Nickel 201 UNS N02201   Monel 400 UNS N04400 Monel K500 UNS N05500   Inconel K600 UNS N06600   Inconel 601 UNS N06601 Inconel 625 UNS N06625   Inconel 800 UNS N08800   Inconel 800H UNS N08810 Inconel 825 UNS N08825   Hastelloy C276 UNS N10276   Alloy 20 UNS N08020 Other Hydraulic Fittings     Instrumentation Fittings Test Certificate Manufacturer Test Certificate as per EN 10204 31 nbsp Types Of Forged Union SS 310 310S Forged Union Duplex Steel UNS S31803 Forged Union Stainless Steel 304 304L Forged Union Duplex Steel Forged Union Stainless Steel 316 316L Forged Union Duplex Steel UNS S32205 Forged Union Stailess Steel 321 321H Forged Union Super Duplex UNS S32750 Forged Union Monel 400 Forged Union Hastelloy C276 Forged Union SS Forged Union Steel Forged Union Inconel 625 Forged Union Alloy 20 Forged Union CuNi 7030 C71500 Forged Union CuNi 9010 C70600 Forged Union ASTM A105 Forged Union ASTM A350 LF2 LF3 Forged Union Inconel 600 Forged Union Hastelloy B2 Forged Union SS 317 317L Forged Union Super Duplex Forged Union SS 347 Forged Union Super Duplex UNS S32950 Forged Union Monel K500 Forged Union Hastelloy C22 Forged Union Stainless Steel 446 Forged Union ANSI Forged Union Inconel 718 Forged Union 904L Forged Union Incoloy 800 Forged Union Titanium Gr 2 Forged Union Incoloy 825 Forged Union Titanium Gr 5 Forged Union RFP India is one of the leading Supplier Exporters and Manufactures and offers the high standard quality of Forged Union pipe fittingsWith types such as Socket Weld SW amp Screwed SCRD NPT BSP BSPT the
Product:ASME Socketweld threaded fittings hydrolic Brand:Renaissance Pipe Fitting Inc. Sizes:Refer the specification Condition:New Rating:4.3, based on� 25� reviews price:Start from� 20� USD RANGE : 1/2â?? NB to 4â?? NB FORMS : Elbow, Tee , Union, coupling, Cross, Cap, Swage Nipple, Plug, Bush Stainless Steel Hydraulic Fittings : Standard� : ASTM / ASME A/SA 182 Grade� : F 304, 304L, 304H, 309S, 309H, 310S, 310H, 316, 316TI, 316H, 316L, 316LN, 317, 317L, 321, 321H, 347, 347H, 904L Duplex Steel Hydraulic Fittings : Standard� : ASTM / ASME A/SA 182 Grade� : F 44, F 45, F51, F 53, F 55, F 60, F 61 Aluminium Hydraulic Fittings : Standard� : ASTM B247, B361. Grade� : 2024, 6061, 6063, 6101, 7075. Titanium Hydraulic Fittings : Standard� : ASTM B381. Grade� : Grade 1, Grade 2, Grade 4, Grade 5, Grade 6, Grade 7, Grade 9, Grade 19, Grade 23 Carbon Steel Hydraulic Fittings : Standard� : ASTM A 105/A694/ A350 LF3/A350 LF2. Grade� : F42/46/52/56/60/65/70 Low Temperature Carbon Steel Hydraulic Fittings : Standard� : ASTM A 350 LF2 / A350 LF3 Alloy Steel Hydraulic Fittings : Standard� : ASTM A182 Grade� : F1/F5/F9/F11/F22/F91 Copper Alloy Hydraulic Fittings : Standard� : ASTM / ASME SB 61 / 62 / 151 / 152. Grade� : UNS NO. C 70600 (CU -NI- 90/10), C 71500 (CU -NI- 70/30) C 71640 Nickel Alloy Hydraulic Fittings : Standard� : ASTM / ASME SB 564 / 160 / 472 â?¢ Nickel 200 â?? UNS N02200 � � â?¢ Nickel 201 â?? UNS N02201 � � â?¢ Monel 400 â?? UNS N04400 â?¢ Monel K500 â?? UNS N05500 � � â?¢ Inconel K600 â?? UNS N06600 � � â?¢ Inconel 601 â?? UNS N06601 â?¢ Inconel 625 â?? UNS N06625 � � â?¢ Inconel 800 â?? UNS N08800 � � â?¢ Inconel 800H â?? UNS N08810 â?¢ Inconel 825 â?? UNS N08825 � � â?¢ Hastelloy C276 â?? UNS N10276 � � â?¢ Alloy 20 â?? UNS N08020 Test Certificate : Manufacturer Test Certificate as per EN 10204 / 3.1 Types Of Forged Hydraulic Fittings â?¢ SS 310 / 310S Forged Hydraulic Fittings â?¢ Duplex Steel UNS S31803 Forged Hydraulic Fittings â?¢ Stainless Steel 304 / 304L Forged Hydraulic Fittings â?¢ Duplex Steel Forged Hydraulic Fittings â?¢ Stainless Steel 316 / 316L Forged Hydraulic Fittings â?¢ Duplex Steel UNS S32205 Forged Hydraulic Fittings â?¢ Stailess Steel 321 / 321H Forged Hydraulic Fittings â?¢ Super Duplex UNS S32750 Forged Hydraulic Fittings â?¢ Monel 400 Forged Hydraulic Fittings â?¢ Hastelloy C276 Forged Hydraulic Fittings â?¢ SS Forged Hydraulic Fittings â?¢ Steel Forged Hydraulic Fittings â?¢ Inconel 625 Forged Hydraulic Fittings â?¢ Alloy 20 Forged Hydraulic Fittings â?¢ Cu-Ni 70/30 (C71500) Forged Hydraulic Fittings â?¢ Cu-Ni 90/10 (C70600) Forged Hydraulic Fittings â?¢ ASTM A105 Forged Hydraulic Fittings â?¢ ASTM A350 LF2 / LF3 Forged Hydraulic F
Product: Forged Fittings Brand: Renaissance Pipe Fitting Inc. Sizes: Refer to the specification Condition: New Rating:4.8, based on� 22� reviews price: Start from� 10� USD TYPE : Socket Weld (S/W) & Screwed (SCRD) â?? NPT, BSP, BSPT RANGE : Forged Fittings 15 NB to 100 NB in 2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS available with NACE MR 01-75. FORM : Elbow, Tee, Union, Coupling, Cap, Nipple, Bush, Plug, Hydraulic Fittings Features : Dimensional accuracy, Corrosion resistance, Excellent finish, High efficiency, Durable, Stainless Steel Forged Fittings : Standard� : ASTM / ASME A/SA 182 Grade� : F 304, 304L, 304H, 309S, 309H, 310S, 310H, 316, 316TI, 316H, 316L, 316LN, 317, 317L, 321, 321H, 347, 347H, 904L Duplex Steel Forged Fittings : Standard� : ASTM / ASME A/SA 182 Grade� : F 44, F 45, F51, F 53, F 55, F 60, F 61 Aluminium Forged Fittings : Standard� : ASTM B247, B361. Grade� : 2024, 6061, 6063, 6101, 7075. Titanium Forged Fittings : Standard� : ASTM B381. Grade� : Grade 1, Grade 2, Grade 4, Grade 5, Grade 6, Grade 7, Grade 9, Grade 19, Grade 23 Carbon Steel Forged Fittings : Standard� : ASTM A 105/A694/ A350 LF3/A350 LF2. Grade� : F42/46/52/56/60/65/70 Low Temperature Carbon Steel Forged Fittings : Standard� : ASTM A 350 LF2 / A350 LF3 Alloy Steel Forged Fittings : Standard� : ASTM A182 Grade� : F1/F5/F9/F11/F22/F91 Copper Alloy Forged Fittings : Standard� : ASTM / ASME SB 61 / 62 / 151 / 152. Grade� : UNS NO. C 70600 (CU -NI- 90/10), C 71500 (CU -NI- 70/30) C 71640 Nickel Alloy Forged Fittings : Standard� : ASTM / ASME SB 564 / 160 / 472 â?¢ Nickel 200 â?? UNS N02200 � � â?¢ Nickel 201 â?? UNS N02201 � � â?¢ Monel 400 â?? UNS N04400 â?¢ Monel K500 â?? UNS N05500 � � â?¢ Inconel K600 â?? UNS N06600 � � â?¢ Inconel 601 â?? UNS N06601 â?¢ Inconel 625 â?? UNS N06625 � � â?¢ Inconel 800 â?? UNS N08800 � � â?¢ Inconel 800H â?? UNS N08810 â?¢ Inconel 825 â?? UNS N08825 � � â?¢ Hastelloy C276 â?? UNS N10276 � � â?¢ Alloy 20 â?? UNS N08020 Other : â?¢ Hydraulic Fittings � � � � â?¢ Instrumentation Fittings Test Certificate : Manufacturer Test Certificate as per EN 10204 / 3.1 Types Of Forged Fittings â?¢ SS 310 / 310S Forged Fittings â?¢ Duplex Steel UNS S31803 Forged Fittings â?¢ Stainless Steel 304 / 304L Forged Fittings â?¢ Duplex Steel Forged Fittings â?¢ Stainless Steel 316 / 316L Forged Fittings â?¢ Duplex Steel UNS S32205 Forged Fittings â?¢ Stailess Steel 321 / 321H Forged Fittings â?¢ Super Duplex UNS S32750 Forged Fittings â?¢ Monel 400 Forged Fittings â?¢ Hastelloy C276 Forged Fittings â?¢ SS Forged Fittings â?¢ Steel Forged Fittings â?¢ Inconel 625 Forged Fittings â?¢ Alloy 20 Forged Fittings â?¢ Cu-Ni 70/30 (C71500) Forged Fitti
The chemical processing sector uses Hastelloy instrumentation fittings because they are resistant to oxidation, corrosion, pitting, and stress corrosion cracking. Because of its long service life, thermal stability, and consistent performance, Hastelloy instrumentation fittings are commonly used in applications involving chemical processing and other applications that require exceptional corrosion resistance. In the welded condition, Hastelloy instrumentation fittings can be used in virtually any chemical process in even the most hostile conditions. Although Hastelloy instrumentation fittings are more expensive than other instrumentation fittings made of metals such as stainless steel, they provide better performance and mechanical stability, making them excellent for severely corrosive environments. Hastelloy instrumentation fittings are utilized in a variety of industries, like petrochemical, pharmaceutical, paper and pulp among several others. Global Steel is a stockholder of a wide variety of Hastelloy Instrumentation fittings like �¢?? Hastelloy Reducing Union, Hastelloy Bulkhead Union, Hastelloy Union Elbow, Hastelloy Union Cross, Hastelloy Union Tee, etc Specification List Imperial Size 1/2 to 2 Size 1/16 OD to 2 OD, 2mm OD to 50mm OD Thread NPT, BSP, BSPT, UNF, ISO, SAE, MS, AN, weld ends etc. Pressure Rating 6000PSI for Stainless Steel, 300/1000/3000PSI for Brass Temperature Ratings Up to 1000 F (537 C) Types Tube to Union, Tube to Male, Tube to Female, Instrument Pipe Fittings, Accessories Application Power/ gas/ petroleum/ chemical/ metallurgy/ shipbuilding etc. Our service Nace Mr 01 75 Sour Service Impact Test As Per Ug 84 Macro Structure Analysis Hydrogen Induce Cracking Test (Hic) Sulphide Stress Cracking Test (Sscc) Cryogenic Services (Cryo),hydrogen Services (H2) Helieum Leak Test Dye Peniterant Test (Dp) Magnetic Partius Test (Mp) Post Weld Heat Treatment (Pwht) Ultrasonic Test (Ut) Hydro Test, Etc. Test Certificates EN 10204/3.1B Raw Materials Certificate 100% Radiography Test Report Third Party Inspection Report, etc Production Technique Forged/ Heat treated and machined.
Grades :Hastelloy C-22, Hastelloy C-276, Hastelloy C-2000 Types : Hastelloy Union Hastelloy Coupling Hastelloy Full Coupling Hastelloy Cross Hastelloy Forged Elbow Hastelloy Hex Nipple Hastelloy Plug Hastelloy Bushing Hastelloy Boss Hastelloy Insert Hastelloy Adapter Hastelloy Socket Hastelloy Forged Tee Hastelloy Olets Hastelloy Weldolet Hastelloy Sockolet Hastelloy Elbowlet Hastelloy Thredolet Hastelloy Nipolet Hastelloy Latrolet Hastelloy Sweepolet Hastelloy Half Coupling
Product Description - "Stainless Steel: ASTM A182 F304/ 304L/ 304H/ 316/ 3 l 6L/ 31 7I 317L/ 321/310/ 34 7I 904L etc. Carbon Steel: ASTMA105 I A694 F42/46/ 52/56/ 60/ 65/70 I A350 LF3/ A350 LF2. AlloySteel:ASTMA182 Fl/ F5/ F9I Fl 1 I F22/F9 l etc. Others: Monel, Nickel, lnconel, Hastelloy, Copper, Brass, Bronze, Titanium, Tantalum, Aluminium, High Speed Steel, Zinc, Lead, Duplex Steel, etc. Key Specifications/Special Features - "Types: Elbow, Tee, Union, Cross, Coupling, Cap, Bushing , Plug, Swage Nipple, Welding Boss, Hexagon Nipple, Borrei Nipple, Welding Nipple, Parroler Nipple, Street Elbow, Hexagon Nut, Hose Nipple, Bend, Adapter, Insert, Weldolet, Elbowlet, Sockolet, Thredolet, Nipolet, Letrolet, etc. Size: 1 /4"" NB TO4"" NB. (Socketweld &Threaded) Class: 3000#, 6000#, 9000#" Minimum Order Size and Packaging details - 35
ASTM A182 F316L FNPT coupling Forged SW NPT threaded socket Pipe Fittings Products: 45Deg 90Ddeg 180deg elbow, Equal Tee, Reducing Tee, concentric eccentric reducer, Straight Cross, Reducing Cross, Weldolet, Sockolet, Threadolet, Nippolet, Boss, Coupling, Full Coupling, Half Coupling, Reducing Coupling, Nipple, Concentric Swage Nipple, Eccentric Swage Nipple, Union, Bushing, Plug, End Caps forged forging carbon alloy duplex stainless nickel monel inconel incoloy hastelloy nimonic socket welding threaded NPT fittings elbow tee reducer cap coupling nipple union plug bushing Size: 1/8"-4", 1/2"-24"(Weldolet) Ratings: 3000, 6000, 9000 / SCH80, SCH160, SCHXXS Standard: ASTM A182 ASME B16.11 / BS 3199 Fittings socket welding or NPT threaded, forging according ASTM A / ASME SA182, ASME B16.11 (Union acc. MSS SP-83, Outlets acc. MSS SP-97) white pickled. With certificate to EN10204/3.1 Material: Carbon Steel: ASTM A105, A105N, A694 F42, A694 F52, A694 F60, A694 F65, A694 F70, A350 LF2, A350 LF3, socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union Alloy Steel: ASTM A182 F5 F9 F11 F12 F22 F91 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union Stainless Steel: astm A182 304 304l 316 316l 321 316ti 347 347h 310s 309s 310 309 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, Duplex stainless: duplex 2205 2507 s31803 s32750 s32760 s31254 254smo smo254 904l uns no8904 f51 f53 f44 f55 f60 f62 s31050 s32205 s32550 uns no8367 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, Nickel alloy: nickel 200 201 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, alloy 255 20 31 6xn socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, monel 400 k500 404 400a 30c socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, inconel 600 601 625 718 783 690 x750 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, incoloy 800 800h 800ht 825 901 925 6mo 25-6mo socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, hastelloy b b2 b3 c c4 c22 c276 c2000 x g-30 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, nimonic 80a 90 263 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, a182 threaded fittings,carbon threaded fittings,stainless threaded fittings,duplex threaded fittings,threaded pipe fittings,a105 threaded fittings, A182 socket fittings, carbon socket fittings,stainless socket fittings,duplex socket fittings,socket pipe fittings,a105 socket fittings,304 npt fittings, 304l npt fittings,316 npt fittings,316l npt fittings
ASTM A182 F316L SW tee Forged SW NPT threaded socket Pipe Fittings Products: 45Deg 90Ddeg 180deg elbow, Equal Tee, Reducing Tee, concentric eccentric reducer, Straight Cross, Reducing Cross, Weldolet, Sockolet, Threadolet, Nippolet, Boss, Coupling, Full Coupling, Half Coupling, Reducing Coupling, Nipple, Concentric Swage Nipple, Eccentric Swage Nipple, Union, Bushing, Plug, End Caps forged forging carbon alloy duplex stainless nickel monel inconel incoloy hastelloy nimonic socket welding threaded NPT fittings elbow tee reducer cap coupling nipple union plug bushing Size: 1/8"-4", 1/2"-24"(Weldolet) Ratings: 3000, 6000, 9000 / SCH80, SCH160, SCHXXS Standard: ASTM A182 ASME B16.11 / BS 3199 Fittings socket welding or NPT threaded, forging according ASTM A / ASME SA182, ASME B16.11 (Union acc. MSS SP-83, Outlets acc. MSS SP-97) white pickled. With certificate to EN10204/3.1 Material: Carbon Steel: ASTM A105, A105N, A694 F42, A694 F52, A694 F60, A694 F65, A694 F70, A350 LF2, A350 LF3, socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union Alloy Steel: ASTM A182 F5 F9 F11 F12 F22 F91 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union Stainless Steel: astm A182 304 304l 316 316l 321 316ti 347 347h 310s 309s 310 309 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, Duplex stainless: duplex 2205 2507 s31803 s32750 s32760 s31254 254smo smo254 904l uns no8904 f51 f53 f44 f55 f60 f62 s31050 s32205 s32550 uns no8367 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, Nickel alloy: nickel 200 201 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, alloy 255 20 31 6xn socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, monel 400 k500 404 400a 30c socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, inconel 600 601 625 718 783 690 x750 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, incoloy 800 800h 800ht 825 901 925 6mo 25-6mo socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, hastelloy b b2 b3 c c4 c22 c276 c2000 x g-30 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, nimonic 80a 90 263 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, a182 threaded fittings,carbon threaded fittings,stainless threaded fittings,duplex threaded fittings,threaded pipe fittings,a105 threaded fittings, A182 socket fittings, carbon socket fittings,stainless socket fittings,duplex socket fittings,socket pipe fittings,a105 socket fittings,304 npt fittings, 304l npt fittings,316 npt fittings,316l npt fittings
ASTM A182 F53 hex head plug Forged SW NPT threaded socket Pipe Fittings Products: 45Deg 90Ddeg 180deg elbow, Equal Tee, Reducing Tee, concentric eccentric reducer, Straight Cross, Reducing Cross, Weldolet, Sockolet, Threadolet, Nippolet, Boss, Coupling, Full Coupling, Half Coupling, Reducing Coupling, Nipple, Concentric Swage Nipple, Eccentric Swage Nipple, Union, Bushing, Plug, End Caps forged forging carbon alloy duplex stainless nickel monel inconel incoloy hastelloy nimonic socket welding threaded NPT fittings elbow tee reducer cap coupling nipple union plug bushing Size: 1/8"-4", 1/2"-24"(Weldolet) Ratings: 3000, 6000, 9000 / SCH80, SCH160, SCHXXS Standard: ASTM A182 ASME B16.11 / BS 3199 Fittings socket welding or NPT threaded, forging according ASTM A / ASME SA182, ASME B16.11 (Union acc. MSS SP-83, Outlets acc. MSS SP-97) white pickled. With certificate to EN10204/3.1 Material: Carbon Steel: ASTM A105, A105N, A694 F42, A694 F52, A694 F60, A694 F65, A694 F70, A350 LF2, A350 LF3, socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union Alloy Steel: ASTM A182 F5 F9 F11 F12 F22 F91 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union Stainless Steel: astm A182 304 304l 316 316l 321 316ti 347 347h 310s 309s 310 309 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, Duplex stainless: duplex 2205 2507 s31803 s32750 s32760 s31254 254smo smo254 904l uns no8904 f51 f53 f44 f55 f60 f62 s31050 s32205 s32550 uns no8367 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, Nickel alloy: nickel 200 201 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, alloy 255 20 31 6xn socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, monel 400 k500 404 400a 30c socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, inconel 600 601 625 718 783 690 x750 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, incoloy 800 800h 800ht 825 901 925 6mo 25-6mo socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, hastelloy b b2 b3 c c4 c22 c276 c2000 x g-30 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, nimonic 80a 90 263 socket threaded sw npt coupling tee elbow nipple plug reducer cap bushing union, a182 threaded fittings,carbon threaded fittings,stainless threaded fittings,duplex threaded fittings,threaded pipe fittings,a105 threaded fittings, A182 socket fittings, carbon socket fittings,stainless socket fittings,duplex socket fittings,socket pipe fittings,a105 socket fittings,304 npt fittings, 304l npt fittings,316 npt fittings,316l npt fittings