Graflex 2661/1661 Ring Gasket
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Graflex 2661/1661 Ring Gasket

Ring gaskets are a flat sealing element, consisting of an inner and outer diameter sized to fit a flange's bore and bolt circle. Ring gaskets sit inside the flange's bolt circle. ASME B16.21 and ASME B16.47 govern the dimensions of ring gaskets for standard and large diameter pipe flanges. Teadit 2661/1661 flexible graphite sheet has pressure-temperature sealability capabilities that are far superior to all compressed fiber reinforced sheet materials. It is resistant to chemical attack by virtually all organic and inorganic fluids with the exception of concentrated, highly oxidizing acids. Gaskets cut from 2661/1661 flexible graphite sheet seal with low to moderate bolt loads and because of very low creep relaxation, re-torquing is rarely required. Flexible graphite conforms to irregular flange sealing surfaces and readily flows into flange irregularities enabling it to seal both smooth and coarse surface finishes. 2661/1661 is a flexible graphite sheet reinforced with a 316SS foil, .002" thick. The flexible graphite sheet is made from exfoliated graphite flake which is compressed into foil by a carefully controlled calendaring process. In this process, the expanded flake particles are mechanically locked together without the use of fibers, binders or other additives. Sheets of graphite foil are then adhesive bonded and laminated to the required thickness with the 316SS foil core in the center.

Governing StandardsGraflex 2661/1661 Ring Gasket

ASME B16.21 Covers types, sizes, materials, dimensions, tolerances, and markings for nonmetallic flat gaskets.
ASME B16.47 Covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges in sizes NPS 26 through NPS 60. Included are flanges with rating class designations 75, 150, 300, 400, 600, and 900 with requirements given in both SI (Metric) and U. S. Customary units, with diameter of bolts and flange bolt hole expressed in inch units.

Service LimitsGraflex 2661/1661 Ring Gasket

Temperature Continuous Service: -328F (-200C)
Maximum Service:
In air: 842F (450C)
In steam: 1202F (650C)
In reducing or inert media: 5432F (3000C)

Physical PropertiesGraflex 2661/1661 Ring Gasket

Typical Physical Properties:
Density 62.4 lbs/ft^3
Compressibility - Tested under 5000 psi 35%
Recovery - Tested under 5000 psi 18%
Tensile Strength Across Grain 5000 psi
Creep Relaxation 12%
Compressive Strength 24,000psi
Carbon Content 98% minimum
Total Sulfur ≤750 ppm maximum
Leachable Chlorides <30 ppm maximum

Dimensional SpecificationsGraflex 2661/1661 Ring Gasket

Per ASME B16.21-2016
  Pipe Diameter
1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 3 1/2 4 5 6 8 10 12 14 16 18 20 24
Inside Diameter 0.84 1.06 1.31 1.66 2.38 2.38 2.88 3.50 4.00 4.50 5.56 6.63 8.63 10.75 12.75 14.00 16.00 18.00 20.00 24.00
Outside
Diameter
per Class
150# 1.88 2.25 2.62 3.00 3.38 4.12 4.88 5.38 6.38 6.88 7.75 8.75 11.00 13.38 16.13 17.75 20.25 21.62 23.88 28.25
300# 2.12 2.62 2.88 3.25 3.75 4.38 5.12 5.88 6.50 7.12 8.50 9.88 12.12 14.25 16.62 19.12 21.25 23.50 25.75 30.50
600# 2.12 2.62 2.88 3.25 3.75 4.38 5.12 5.88 6.38 7.62 9.50 10.50 12.62 15.75 18.00 19.38 22.25 24.12 26.88 31.12
Per ASME B16.47-2017
Series A Pipe Diameter
26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60
Inside Diameter 26.00 28.00 30.00 32.00 34.00 36.00 38.00 40.00 42.00 44.00 46.00 48.00 50.00 52.00 54.00 56.00 58.00 60.00
Outside
Diameter
per Class
150# 30.50 32.75 34.75 37.00 39.00 41.25 43.75 45.75 48.00 50.25 52.25 54.50 56.50 58.75 61.00 63.25 65.50 67.50
300# 32.88 35.38 37.50 39.62 41.62 44.00 41.50 43.88 45.88 48.00 50.12 52.12 54.25 56.25 58.75 60.75 62.75 64.75
600# 34.12 36.00 38.25 40.25 42.25 44.50 43.50 45.50 48.00 50.00 52.26 54.75 57.00 59.00 61.25 63.50 65.50 67.75
Per ASME B16.47-2017
Series B Pipe Diameter
26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60
Inside Diameter 26.00 28.00 30.00 32.00 34.00 36.00 38.00 40.00 42.00 44.00 46.00 48.00 50.00 52.00 54.00 56.00 58.00 60.00
Outside
Diameter
per Class
150# 28.56 30.56 32.56 34.69 36.81 38.88 41.12 43.12 45.12 47.12 49.44 51.44 53.44 55.44 57.62 59.62 62.19 64.19
300# 30.38 32.50 34.88 37.00 39.12 41.25 43.25 45.25 47.25 49.25 51.88 53.88 55.88 57.88 61.25 62.75 65.19 67.12
600# 30.12 32.25 34.62 36.75 39.25 41.25                        
  1. All dimensions are in inches.
Graflex 2661/1661 Ring Gasket
View
Pipe Diameter Flange Rating Series Thickness Item # Availability Price Quantity UOM
1/2 300#, 400#, 600# - 1/16 GR2661-3460050 5-7 Working Days $1.204/EA EA
3/4 150# - 1/16 GR2661-1500075 In Stock $1.2255/EA EA
3/4 300#, 400#, 600# - 1/16 GR2661-3460075 In Stock $1.3975/EA EA
1 150# - 1/16 GR2661-1500100 In Stock $1.376/EA EA
1 300#, 400#, 600# - 1/16 GR2661-3460100 In Stock $1.505/EA EA
1 1/4 150# - 1/16 GR2661-1500125 5-7 Working Days $1.548/EA EA
1 1/4 300#, 400#, 600# - 1/16 GR2661-3460125 5-7 Working Days $1.677/EA EA
1 1/2 150# - 1/16 GR2661-1500150 In Stock $1.72/EA EA
1 1/2 300#, 400#, 600# - 1/16 GR2661-3460150 In Stock $1.978/EA EA
2 150# - 1/16 GR2661-1500200 In Stock $2.1715/EA EA
2 300#, 400#, 600# - 1/16 GR2661-3460200 5-7 Working Days $2.3865/EA EA
2 1/2 150# - 1/16 GR2661-1500250 In Stock $2.709/EA EA
2 1/2 300#, 400#, 600# - 1/16 GR2661-3460250 5-7 Working Days $2.9455/EA EA
3 150# - 1/16 GR2661-1500300 In Stock $3.0315/EA EA
3 300#, 400#, 600# - 1/16 GR2661-3460300 In Stock $3.569/EA EA
3 1/2 150# - 1/16 GR2661-1500350 5-7 Working Days $5.25569/EA EA
4 150# - 1/16 GR2661-1500400 5-7 Working Days $4.4505/EA EA
4 300# - 1/16 GR2661-3000400 5-7 Working Days $4.773/EA EA
5 150# - 1/16 GR2661-1500500 5-7 Working Days $6.21134/EA EA
5 300# - 1/16 GR2661-3000500 5-7 Working Days $8.81085/EA EA
6 150# - 1/16 GR2661-1500600 In Stock $6.2995/EA EA
6 300# - 1/16 GR2661-3000600 5-7 Working Days $8.256/EA EA
8 150# - 1/16 GR2661-1500800 In Stock $9.245/EA EA
8 300# - 1/16 GR2661-3000800 In Stock $11.7175/EA EA
10 150# - 1/16 GR2661-1501000 In Stock $14.792/EA EA
10 300# - 1/16 GR2661-3001000 In Stock $17.028/EA EA
12 150# - 1/16 GR2661-1501200 In Stock $20.597/EA EA
12 300# - 1/16 GR2661-3001200 In Stock $22.1235/EA EA
14 150# - 1/16 GR2661-1501400 5-7 Working Days $24.4885/EA EA
14 300# - 1/16 GR2661-3001400 5-7 Working Days $29.197/EA EA
16 150# - 1/16 GR2661-1501600 5-7 Working Days $31.1105/EA EA
16 300# - 1/16 GR2661-3001600 5-7 Working Days $34.959/EA EA
18 150# - 1/16 GR2661-1501800 5-7 Working Days $33.97/EA EA
18 300# - 1/16 GR2661-3001800 In Stock $41.8175/EA EA
20 150# - 1/16 GR2661-1502000 In Stock $40.678/EA EA
20 300# - 1/16 GR2661-3002000 5-7 Working Days $49.321/EA EA
24 150# - 1/16 GR2661-1502400 5-7 Working Days $55.4055/EA EA
24 300# - 1/16 GR2661-3002400 5-7 Working Days $67.682/EA EA
1/2 150# - 1/8 GR2661-1500050-1/8 In Stock $1.3115/EA EA
1/2 300#, 400#, 600# - 1/8 GR2661-3460050-1/8 5-7 Working Days $1.4835/EA EA
3/4 150# - 1/8 GR2661-1500075-1/8 In Stock $1.548/EA EA
3/4 300#, 400#, 600# - 1/8 GR2661-3460075-1/8 5-7 Working Days $4.128/EA EA
1 150# - 1/8 GR2661-1500100-1/8 5-7 Working Days $1.7845/EA EA
1 300#, 400#, 600# - 1/8 GR2661-3460100-1/8 5-7 Working Days $4.472/EA EA
1 1/4 150# - 1/8 GR2661-1500125-1/8 5-7 Working Days $2.064/EA EA
1 1/4 300#, 400#, 600# - 1/8 GR2661-3460125-1/8 5-7 Working Days $5.0095/EA EA
1 1/2 150# - 1/8 GR2661-1500150-1/8 In Stock $2.3865/EA EA
1 1/2 300#, 400#, 600# - 1/8 GR2661-3460150-1/8 5-7 Working Days $6.536/EA EA
2 150# - 1/8 GR2661-1500200-1/8 5-7 Working Days $3.1605/EA EA
2 300#, 400#, 600# - 1/8 GR2661-3460200-1/8 5-7 Working Days $7.181/EA EA
2 1/2 150# - 1/8 GR2661-1500250-1/8 In Stock $4.0635/EA EA
2 1/2 300#, 400#, 600# - 1/8 GR2661-3460250-1/8 5-7 Working Days $9.2235/EA EA
3 150# - 1/8 GR2661-1500300-1/8 5-7 Working Days $4.644/EA EA
3 300#, 400#, 600# - 1/8 GR2661-3460300-1/8 5-7 Working Days $10.8575/EA EA
3 1/2 150# - 1/8 GR2661-1500350-1/8 5-7 Working Days $11.76901/EA EA
4 150# - 1/8 GR2661-1500400-1/8 5-7 Working Days $7.052/EA EA
4 300# - 1/8 GR2661-3000400-1/8 5-7 Working Days $7.611/EA EA
5 150# - 1/8 GR2661-1500500-1/8 5-7 Working Days $13.909/EA EA
5 300# - 1/8 GR2661-3000500-1/8 5-7 Working Days $19.73007/EA EA
6 150# - 1/8 GR2661-1500600-1/8 5-7 Working Days $10.234/EA EA
6 300# - 1/8 GR2661-3000600-1/8 5-7 Working Days $13.5665/EA EA
8 150# - 1/8 GR2661-1500800-1/8 In Stock $15.394/EA EA
8 300# - 1/8 GR2661-3000800-1/8 5-7 Working Days $19.522/EA EA
10 150# - 1/8 GR2661-1501000-1/8 In Stock $23.6285/EA EA
10 300# - 1/8 GR2661-3001000-1/8 5-7 Working Days $31.777/EA EA
12 150# - 1/8 GR2661-1501200-1/8 In Stock $33.583/EA EA
12 300# - 1/8 GR2661-3001200-1/8 5-7 Working Days $36.1845/EA EA
14 150# - 1/8 GR2661-1501400-1/8 5-7 Working Days $40.248/EA EA
14 300# - 1/8 GR2661-3001400-1/8 5-7 Working Days $48.3105/EA EA
16 150# - 1/8 GR2661-1501600-1/8 5-7 Working Days $51.6/EA EA
16 300# - 1/8 GR2661-3001600-1/8 5-7 Working Days $58.2005/EA EA
18 150# - 1/8 GR2661-1501800-1/8 5-7 Working Days $56.502/EA EA
18 300# - 1/8 GR2661-3001800-1/8 5-7 Working Days $69.961/EA EA
20 150# - 1/8 GR2661-1502000-1/8 5-7 Working Days $68.026/EA EA
20 300# - 1/8 GR2661-3002000-1/8 5-7 Working Days $82.818/EA EA
24 150# - 1/8 GR2661-1502400-1/8 5-7 Working Days $93.267/EA EA
24 300# - 1/8 GR2661-3002400-1/8 5-7 Working Days $114.294/EA EA