Long Neck Welding (abbreviated LWN) flanges are similar to a standard Welding Neck flange, but the “Neck” is considerably longer. This type is often used as a nozzle for a barrel or column. In addition, there are the type LWN Heavy Barrel (HB) and the Equal LWN Barrel (E); they have a different shape and a thicker “Wall”.

Temperature range
Viton: -20°C to 200°C
Silicone: -50°C to 230°C
Buna: -30°C to 110°C
EVAC metal seal: -270°C to 150°C
Tube OD sizes: 3/8 to 2 inches


Materials:
Flange: 304 or 316L stainless steel
O-rings: Viton, Buna, & silicone
Fasteners: Wingnut, SureSeal, bulkhead & EVAC clamps
Vacuum range
Elastomer seal: >=1 x 10^-8 Torr – High vacuum
EVAC metal seal: >=1 x 10^-11 Torr – UHV

Dimensions Long Weld Neck Flanges, ANSI CLASS 150, ASME B16.5, 1/16″ RAISED FACE (IN)

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • Connection complies with ASME BPVC Section II, Section VIII Division 1 and ASTM A105.
  • Angle “AA” is 30° per Section VIII Division 1.
  • Angle “AA” is 45° per Section VIII Division 2.

data std conn lwf b16.5 150 300data std conn

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of Hub

at Base


J

Length

of

Hub


K

Nunber

of

Bolt

Holes

Diamete

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

1/2 3 1/2 1 3/8 7/16 0.50 1 1/4 9 4 5/8 2 3/8 3
3/4 3 7/8 1 11/16 1/2 0.75 1 5/8 9 4 5/8 2 3/4 5
1 4 1/4 2 9/16 1.00 2 9 4 5/8 3 1/8 8
1 1/4 4 5/8 2 1/2 5/8 1.25 2 3/8 9 4 5/8 3 1/2 10
1 1/2 5 2 7/8 11/16 1.50 2 5/8 9 4 5/8 3 7/8 12
2 6 3 5/8 3/4 2.00 3 1/4 9 4 3/4 4 3/4 16
2 1/2 7 4 1/8 7/8 2.50 3 3/4 9 4 3/4 5 1/2 21
3 7 1/2 5 15/16 3.00 4 1/4 9 4 3/4 6 24
3 1/2 8 1/2 5 1/2 15/16 3.60 4 7/8 9 8 3/4 7 31
4 9 6 3/16 15/16 4.00 5 1/2 12 8 3/4 7 1/2 47
5 10 7 5/16 15/16 5.00 6 1/2 12 8 7/8 8 1/2 57
6 11 8 1/2 1 6.00 7 3/4 12 8 7/8 9 1/2 77
8 13 1/2 10 5/8 1 1/8 8.00 9 3/4 12 8 7/8 11 3/4 103
10 16 12 3/4 1 3/16 10.00 12 12 12 1 14 1/4 150
12 19 15 1 1/4 12.00 14 3/8 12 12 1 17 215
14 21 16 1/4 1 3/8 14.00 16 12 12 1 1/8 18 3/4 221
16 23 1/2 18 1/2 1 7/16 16.00 18 12 16 1 1/8 21 1/4 254
18 25 21 1 9/16 18.00 20 12 16 1 1/4 22 3/4 276
20 27 1/2 23 1 11/16 20.00 22 12 20 1 1/4 25 324
22
24 32 27 1/4 1 7/8 24.00 26 1/4 12 20 1 3/8 29 1/2 439

FLANGE – LONG WELD NECK, ANSI CLASS 300, ASME B16.5, 1/16″ RAISED FACE (IN)

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • Connection complies with ASME BPVC Section II, Section VIII Division 1 and ASTM A105.
  • Angle “AA” is 30° per Section VIII Division 1.
  • Angle “AA” is 45° per Section VIII Division 2.

data std conn lwf b16.5 150 300data std conn

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of Hub

at Base


J

Length

of

Hub


K

Nunber

of

Bolt

Holes

Diamete

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

1/2 3 3/4 1 3/8 9/16 0.50 1 1/2 9 4 5/8 2 5/8 5
3/4 4 5/8 1 11/16 5/8 0.75 1 7/8 9 4 3/4 3 1/4 9
1 4 7/8 2 11/16 1.00 2 1/8 9 4 3/4 3 1/2 10
1 1/4 5 1/4 2 1/2 3/4 1.25 2 1/2 9 4 3/4 3 7/8 14
1 1/2 6 1/8 2 7/8 13/16 1.50 2 3/4 9 4 7/8 4 1/2 17
2 6 1/2 3 5/8 7/8 2.00 3 1/4 9 8 3/4 5 19
2 1/2 7 1/2 4 1/8 1 2.50 3 15/16 9 8 7/8 5 7/8 28
3 8 1/4 5 1 1/8 3.00 4 5/8 9 8 7/8 6 5/8 36
3 1/2 9 5 1/2 1 3/16 3.50 5 1/4 9 8 7/8 7 1/4 45
4 10 6 3/16 1 1/4 4.00 5 3/4 12 8 7/8 7 7/8 54
5 11 7 5/16 1 3/8 5.00 7 12 8 7/8 9 1/4 86
6 12 1/2 8 1/2 1 7/16 6.00 8 1/8 12 12 7/8 10 5/8 108
8 15 10 5/8 1 5/8 8.00 10 1/4 12 12 1 13 150
10 17 1/2 12 3/4 1 7/8 10.00 12 5/8 12 16 1 1/8 15 1/4 218
12 20 1/2 15 2 12.00 14 3/4 12 16 1 1/4 17 3/4 289
14 23 16 1/4 2 1/8 14.00 16 3/4 12 20 1 1/4 20 1/4 342
16 25 1/2 18 1/2 2 1/4 16.00 19 12 20 1 3/8 22 1/2 426
18 28 21 2 3/8 18.00 21 12 24 1 3/8 24 3/4 493
20 30 1/2 23 2 1/2 20.00 23 1/8 12 24 1 3/8 27 575
22
24 36 27 1/4 2 3/4 24.00 27 5/8 12 24 1 5/8 32 823

FLANGE – LONG WELD NECK, ANSI CLASS 400, ASME B16.5, 1/16″ RAISED FACE (IN)

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • Connection complies with ASME BPVC Section II, Section VIII Division 1 and ASTM A105.
  • Angle “AA” is 30° per Section VIII Division 1.
  • Angle “AA” is 45° per Section VIII Division 2.

data std conn lwf b16.5 400 2500data std conn

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of Hub

at Base


J

Length

of

Hub


K

Nunber

of

Bolt

Holes

Diamete

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

1/2 3 3/4 1 3/8 9/16 0.50 1 1/2 9 4 5/8 2 5/8 5
3/4 4 5/8 1 11/16 5/8 0.75 1 7/8 9 4 3/4 3 1/4 8
1 4 7/8 2 11/16 1.00 2 1/8 9 4 3/4 3 1/2 11
1 1/4 5 1/4 2 1/2 13/16 1.25 2 1/2 9 4 3/4 3 7/8 14
1 1/2 6 1/8 2 7/8 7/8 1.50 2 3/4 9 4 7/8 4 1/2 17
2 6 1/2 3 5/8 1 2.00 3 1/4 9 8 3/4 5 21
2 1/2 7 1/2 4 1/8 1 1/8 2.50 3 15/16 9 8 7/8 5 7/8 29
3 8 1/4 5 1 1/4 3.00 4 5/8 9 8 7/8 6 5/8 38
3 1/2 9 5 1/2 1 3/8 3.50 5 1/4 9 8 1 7 1/4 48
4 10 6 3/16 1 3/8 4.00 5 3/4 12 8 1 7 7/8 67
5 11 7 5/16 1 1/2 5.00 7 12 8 1 9 1/4 90
6 12 1/2 8 1/2 1 5/8 6.00 8 1/8 12 12 1 10 5/8 115
8 15 10 5/8 1 7/8 8.00 10 1/4 12 12 1 1/8 13 140
10 17 1/2 12 3/4 2 1/8 10.00 12 5/8 12 16 1 1/4 15 1/4 230
12 20 1/2 15 2 1/4 12.00 14 3/4 12 16 1 3/8 17 3/4 301
14 23 16 1/4 2 3/8 14.00 16 3/4 12 20 1 3/8 20 1/4 336
16 25 1/2 18 1/2 2 1/2 16.00 19 12 20 1 1/2 22 1/2 416
18 28 21 2 5/8 18.00 21 12 24 1 1/2 24 3/4 481
20 30 1/2 23 2 3/4 20.00 23 1/8 12 24 1 5/8 27 563
22
24 36 27 1/4 3 24.00 27 5/8 12 24 1 7/8 32 799

Dimensions Long Weld Neck Flanges, ANSI CLASS 600, ASME B16.5, 1/16″ RAISED FACE (IN)

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • Connection complies with ASME BPVC Section II, Section VIII Division 1 and ASTM A105.
  • Angle “AA” is 30° per Section VIII Division 1.
  • Angle “AA” is 45° per Section VIII Division 2.

data std conn lwf b16.5 400 2500data std conn

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of Hub

at Base


J

Length

of

Hub


K

Nunber

of

Bolt

Holes

Diamete

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

1/2 3 3/4 1 3/8 9/16 0.50 1 1/2 9 4 5/8 2 5/8 5
3/4 4 5/8 1 11/16 5/8 0.75 1 7/8 9 4 3/4 3 1/4 8
1 4 7/8 2 11/16 1.00 2 1/8 9 4 3/4 3 1/2 11
1 1/4 5 1/4 2 1/2 13/16 1.25 2 1/2 9 4 3/4 3 7/8 14
1 1/2 6 1/8 2 7/8 7/8 1.50 2 3/4 9 4 7/8 4 1/2 17
2 6 1/2 3 5/8 1 2.00 3 1/4 9 8 3/4 5 21
2 1/2 7 1/2 4 1/8 1 1/8 2.50 3 15/16 9 8 7/8 5 7/8 29
3 8 1/4 5 1 1/4 3.00 4 5/8 9 8 7/8 6 5/8 38
3 1/2 9 5 1/2 1 3/8 3.50 5 1/4 9 8 1 7 1/4 48
4 10 3/4 6 3/16 1 1/2 4.00 6 12 8 1 8 1/2 80
5 13 7 5/16 1 3/4 5.00 7 1/2 12 8 1 1/8 10 1/2 128
6 14 8 1/2 1 7/8 6.00 8 3/4 12 12 1 1/8 11 1/2 158
8 16 1/2 10 5/8 2 3/16 8.00 10 3/4 12 12 1 1/4 13 3/4 215
10 20 12 3/4 2 1/2 10.00 13 1/2 12 16 1 3/8 17 324
12 22 15 2 5/8 12.00 15 3/4 12 20 1 3/8 19 1/4 500
14 23 3/4 16 1/4 2 3/4 14.00 17 16 20 1 1/2 20 3/4 417
16 27 18 1/2 3 16.00 19 1/2 16 20 1 5/8 23 3/4 564
18 29 1/4 21 3 1/4 18.00 21 1/2 16 20 1 3/4 25 3/4 654
20 32 23 3 1/2 20.00 24 16 24 1 3/4 28 1/2 840
22
24 37 27 1/4 4 24.00 28 1/4 16 24 2 33 1100

Dimensions Long Weld Neck Flanges, ANSI CLASS 900, ASME B16.5, 1/16″ RAISED FACE (IN)

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • Connection complies with ASME BPVC Section II, Section VIII Division 1 and ASTM A105.
  • Angle “AA” is 30° per Section VIII Division 1.
  • Angle “AA” is 45° per Section VIII Division 2.

data std conn lwf b16.5 400 2500data std conn

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of Hub

at Base


J

Length

of

Hub


K

Nunber

of

Bolt

Holes

Diamete

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

1/2 4 3/4 1 3/8 7/8 0.50 1 9/16 9 4 7/8 3 1/4 8
3/4 5 1/8 1 11/16 1 0.75 1 13/16 9 4 7/8 3 1/2 10
1 5 7/8 2 1 1/8 1.00 2 1/16 9 4 1 4 15
1 1/4 6 1/4 2 1/2 1 1/8 1.25 2 1/2 9 4 1 4 3/8 18
1 1/2 7 2 7/8 1 1/4 1.50 2 3/4 9 4 1 1/8 4 7/8 23
2 8 1/2 3 5/8 1 1/2 2.00 4 1/8 9 8 1 6 1/2 44
2 1/2 9 5/8 4 1/8 1 5/8 2.50 4 7/8 12 8 1 1/8 7 1/2 72
3 9 1/2 5 1 1/2 3.00 5 12 8 1 7 1/2 65
3 1/2
4 11 1/2 6 3/16 1 3/4 4.00 6 1/4 12 8 1 1/4 9 1/4 98
5 13 3/4 7 5/16 2 5.00 7 1/2 12 8 1 3/8 11 143
6 15 8 1/2 2 3/16 6.00 9 1/4 12 12 1 1/4 12 1/2 199
8 18 1/2 10 5/8 2 1/2 8.00 11 3/4 12 12 1 1/2 15 1/2 310
10 21 1/2 12 3/4 2 3/4 10.00 14 1/2 12 16 1 1/2 18 1/2 385
12 24 15 3 1/8 12.00 16 1/2 12 20 1 1/2 21 667
14 25 1/4 16 1/4 3 3/8 14.00 17 3/4 16 20 1 5/8 22 558
16 27 3/4 18 1/2 3 1/2 16.00 20 16 20 1 3/4 24 1/4 670
18 31 21 4 18.00 22 1/4 16 20 2 27 949
20 33 3/4 23 4 1/4 20.00 24 1/2 16 20 2 1/8 29 1/2 1040
22
24 41 27 1/4 5 1/2 24.00 29 1/2 16 20 2 5/8 35 1/2 1775

Dimensions Long Weld Neck Flanges, ANSI CLASS 1500, ASME B16.5, 1/16″ RAISED FACE (IN)

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • Connection complies with ASME BPVC Section II, Section VIII Division 1 and ASTM A105.
  • Angle “AA” is 30° per Section VIII Division 1.
  • Angle “AA” is 45° per Section VIII Division 2.

data std conn lwf b16.5 400 2500data std conn

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of Hub

at Base


J

Length

of

Hub


K

Nunber

of

Bolt

Holes

Diamete

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

1/2 4 3/4 1 3/8 7/8 0.50 1 9/16 9 4 7/8 3 1/4 10
3/4 5 1/8 1 11/16 1 0.75 1 13/16 9 4 7/8 3 1/2 13
1 5 7/8 2 1 1/8 1.00 2 1/16 9 4 1 4 15
1 1/4 6 1/4 2 1/2 1 1/8 1.25 2 1/2 9 4 1 4 3/8 18
1 1/2 7 2 7/8 1 1/4 1.50 2 3/4 9 4 1 1/8 4 7/8 23
2 8 1/2 3 5/8 1 1/2 2.00 4 1/8 9 8 1 6 1/2 44
2 1/2 9 5/8 4 1/8 1 5/8 2.50 4 7/8 9 8 1 1/8 7 1/2 72
3 10 1/2 5 1 7/8 3.00 5 1/4 9 8 1 1/4 8 84
3 1/2
4 12 1/4 6 3/16 2 1/8 4.00 6 3/8 12 8 1 3/8 9 1/2 118
5 14 3/4 7 5/16 2 7/8 5.00 7 3/4 12 8 1 5/8 11 1/2 195
6 15 1/2 8 1/2 3 1/4 6.00 9 12 12 1 1/2 12 1/2 235
8 19 10 5/8 3 5/8 8.00 11 1/2 12 12 1 3/4 15 1/2 366
10 23 12 3/4 4 1/4 10.00 14 1/2 12 12 2 19 610
12 26 1/2 15 4 7/8 12.00 17 3/4 16 16 2 1/8 22 1/2 1128
14 29 1/2 16 1/4 5 1/4 14.00 19 1/2 16 16 2 3/8 25 1030
16 32 1/2 18 1/2 5 3/4 16.00 21 3/4 16 16 2 5/8 27 3/4 1335
18 36 21 6 3/8 18.00 23 1/2 16 16 2 7/8 30 1/2 1750
20 38 3/4 23 7 20.00 25 1/4 16 16 3 1/8 32 3/4 2130
22
24 46 27 1/4 8 24.00 30 16 16 3 5/8 39 3180

Dimensions Long Weld Neck Flanges, ANSI CLASS 2500, ASME B16.5, 1/16″ RAISED FACE (IN)

  • Dimensions to ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • Connection complies with ASME BPVC Section II, Section VIII Division 1 and ASTM A105.
  • Angle “AA” is 30° per Section VIII Division 1.
  • Angle “AA” is 45° per Section VIII Division 2.

data std conn lwf b16.5 400 2500data std conn

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of Hub

at Base


J

Length

of

Hub


K

Nunber

of

Bolt

Holes

Diamete

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

1/2 5 1/4 1 3/8 1 3/16 0.50 1 13/16 9 4 7/8 3 1/2 11
3/4 5 1/2 1 11/16 1 1/4 0.75 2 1/16 9 4 7/8 3 3/4 13
1 6 1/4 2 1 3/8 1.00 2 1/4 9 4 1 4 1/4 20
1 1/4 7 1/4 2 1/2 1 1/2 1.25 2 7/8 9 4 1 1/8 5 1/8 30
1 1/2 8 2 7/8 1 3/4 1.50 3 1/8 9 4 1 1/4 5 3/4 38
2 9 1/4 3 5/8 2 2.00 3 3/4 9 8 1 1/8 6 3/4 55
2 1/2 10 1/2 4 1/8 2 1/4 2.50 4 1/2 9 8 1 1/4 7 3/4 85
3 12 5 2 5/8 3.00 5 1/4 9 8 1 3/8 9 125
3 1/2
4 14 6 3/16 3 4.00 6 1/2 12 8 1 5/8 10 3/4 185
5 16 1/2 7 5/16 3 5/8 5.00 8 12 8 1 7/8 12 3/4 300
6 19 8 1/2 4 1/4 6.00 9 1/4 12 8 2 1/8 14 1/2 450
8 21 3/4 10 5/8 5 8.00 12 16 12 2 1/8 17 1/4 600
10 26 1/2 12 3/4 6 1/2 10.00 14 3/4 16 12 2 5/8 21 1/4 1150
12 30 15 7 1/4 12.00 17 3/8 16 12 2 7/8 24 3/8 1560


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