Production Range of Lug Nut Union

ProductLug Nut Union
ConnectionSocket Weld / Threaded
Size1/8″ NPS TO 4″ NPS
Pressure Rating3000LB, 6000LB, 9000LB (SCH80/XS,SCH160,XXS)
Process methodForged, CNC Machined
Standards:ASME B16.11-(SOCKET DIMENSIONS ONLY), ASME B1.20.1-(NPT)
CertificationEN 10204 3.1
  • Thread: NPT, NPSC, BSPT, BSPP, Type: Male and Female
  • MS SP-83 contains dimensionals, finish, tolerances, testing, marking, material, and minimum performance requirements for forged carbon and stainless steel pipe unions, socket welding and threaded ends.

Lug Nut Union Dimensions

Lug Nut Union Drawing

Lug Nut Union Drawing

CLASS 3000
PIPE SIZE 3/8 1/2 3/411-1/41-1/22   2-1/234
A1.8751.9842.2972.8912.9063.0313.4844.0634.4848.031
B2.56333.6254.2555.6256.3757.188810.359
C1.0311.0311.4841.8132.1882.4693.0313.6564.4065.453
D1.1251.1251.2971.8911.9042.0312.2342.8133.2346.531
Emin0.3750.3750.50.50.50.50.6250.6250.6250.75
F0.690.8551.0651.331.6751.9152.4062.9063.5354.545
Weight(LBS)0.590.913.122.283.484.667.0711.415.42
CLASS 6000
PIPE SIZE 3/8 1/2 3/411-1/41-1/22   2-1/234
A2.3752.5782.893.1253.5784.141
B3.6254.2555.6256.3757.188
C1.4691.7972.1722.5633.0313.688
D1.6251.5781.892.1252.5782.89
E0.3750.50.50.50.50.625
F0.8551.0651.331.6751.9152.406
Weight(LBS)1.952.843.96714.16
  • Seating characteristics of MSS SP-83 Unions.
  • The “B” dimension is the diameter across the lugs of union nut.
  • Twin Lug design offered in sizes up to 3/4″ Class 3000 & 1/2″ Class 6000.
  • Tri-Lug design offered in sizes from 1″ to Class 3000&3/4″ to 2″ Class 6000.
  • Quad-lug design offered in 4″ Class 3000.

MSS SP-83 Socket Welding & Threaded Union Manufacturers, Suppliers – ASTM A105, ASTM A182 F304, F316, F304L, F316L, and A182 F5, F9, F11, F22, F91

  • Size: from 1/8″ NPS TO 3″ NPS, Pressure Rating: 3000LB, 6000LB (SCH80/XS,SCH160), Thread: NPT, NPSC, BSPT, BSPP, Type: Male and Female
  • Types of Unions – Socket Weld Union, Threaded Union, Male x Female Threaded Union, Socket Weld x Female Threaded Union, Butt Weld Union, Lug Nut Union

Metallica is a well known manufacturer and supplier of MSS SP-83 socket welding and threaded steel pipe unions for the clients from oil and gas, petrochemicals, railway, construction and other industries. We manufacture different size and shapes of unions by closed die forging. Our main products include socket weld fittings and threaded fittings in size range of 1/4″ to 4″ (6mm-100mm), with pressure rating of 2000LBS, 3000LBS, 6000LBS, and 9000LBS. The most common and materials include ASTM A105, ASTM A182 F304, F316, F304L, F316L, and A182 F5/F9/F11/F22/F91. In nickel alloys we manufacturing forged union pipe fittings in various grades such as Alloy 200, 201, 400, K500, 600, 625, 800H/HT, 825, X-750, C276, Hastelloy B & C22.

Forged Socket Weld & Threaded Pipe Fittings Manufacturing Standards

  • ASTM A182 – ASME SA182 – Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
  • ASME B16.9 – Factory-Made Wrought Buttwelding Fittings
  • ASME B16.11 – Socket Welding and Threaded Forged Fittings
  • MSS SP-43 – Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications
  • MSS SP-95 – Swage(d) Nipples and Bull Plugs
  • BS3799 – Specification for Steel pipe fittings, screwed and Socket-welding for the petroleum industry
  • MSS SP-83 – Socket Welding and Threaded Steel Pipe Unions

Socket weld and threaded fittings are generally used for small size pipes and piping systems (generally below 4 inches in diameter for Class 3000, and below 2 inches for fittings in class 6000 and 9000). Forged pipe fittings are manufactured by forging, followed by heat treatment and machining solid steel as per the dimensional standards. For bigger size piping systems buttweld pipe fittings produced as per ASME B16.9 are used.

Pressure & Temperature Service Rating for Class 3000 Carbon and Stainless Steel Unions Socket Welding & Threaded Ends

SERVICENON一SHOCK WORKING PRESSURE (PSI)
TEMP
DEGREE °FASTM A105 Carbon SteelASTM A182 F316 Stainless SteelASTM A182 F304L F316L Stainless SteelASTM A182 F304L Stainless Steel
1003000291524302915
2002735251020502430
3002655226518352140
4002565208016701905
5002425193515451770
6002220183014601680
6502180180014201650
7002155175013901630
750171013601610
800168013301595
850164513001575
90015951555
95015651515
100014701300

Socket Weld & Threaded Union Materials & Grades

  • Carbon Steel: ASTM/ASME A/SA 105, ASTM/ASME A 350 LF2, LF3
  • Alloy Steel: ASTM/ASME A/SA 182 F1, F5, F9, F11, F12, F22, F91
  • Stainless Steel: ASTM A 182 F304, F304L, F304H, F316, F316L, F316Ti, F310, F321, F321H, F317, F347, F347H, F904L
  • Duplex & Super Duplex Steel: ASTM A182 F44, F45, F51, F53, F55, F60
  • Copper Nickel Alloys: UNS C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS C10100, 10200, 10300, 10800, 12000, 12200
  • Nickel Alloys: ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS N02200), Nickel 201 (UNS N02201), Monel 400 (UNS N04400), Monel 500 (UNS N05500), Inconel 800 (UNS N08800), Inconel 825 (UNS N08825), Inconel 600 (UNS N06600), Inconel 625 (UNS N06625), Inconel 601 (UNS N06601), Hastelloy C 276 (UNS N10276), Alloy 20 (UNS N08020)