15NB ANSI 300 / 600 Ring Face Gasket, 3mm NRI

SKU: SWM000005P06V0021
Availability: Cut to Order, Ships in 2-3 W/Days.
$0.56
INC. GST
$0.50
EX. GST

BULK DISCOUNT RATES

All Bulk Prices Below Are Quoted Including GST.
Buy 10 - 24 and pay only $0.48 each
Buy 25 - 49 and pay only $0.45 each
Buy 50 - 99 and pay only $0.42 each
Buy 100 or above and pay only $0.39 each
  • Economical ring gaskets made from Natural Rubber Insertion.
  • Good for sealing at low pressures and temperatures or for hydro testing.
  • Cut to suit the size requirements of ANSI B16.21. Available in all Flange Tables (150, 300, 600, 900 & 1500) as standard.
  • Custom size gaskets also available upon request.

This page lists ring type gaskets made to suit ANSI 300# and/or ANSI 600# flanges. This is one of those flange tables where in some nominal bore sizes (e.g. 50NB / 2") a ring type gasket will fit both 300# and 600# flanges. In other sizes (100NB), different gaskets are required depending on which flange is used. 

Gaskets to suit ANSI 150, ANSI 900 and ANSI 1500 flanges are all available from our online store as well. Links to the relevant pages for each are included at the bottom of this page.

Natural Rubber Insertion (NRI) Flange Gaskets are often used in low temperature and low-pressure sealing. Cut in our Australian factory from our Natural Rubber Insertion sheet, the gaskets featured on this page are all designed to suit ASME B16.21 Sizing (used with ASME B16.5 Pipe Flanges).

These gaskets are used in many different industries around Australia because of their low cost and reliable sealing performance. Insertion Rubber Gaskets are suitable for sealing applications where temperatures are between 0°C and 70°C. They are often used for hydro-testing or permanent, low pressure flange sealing because of their economic nature.

For more information on this material, please consult our Natural Insertion Rubber Technical Data Sheet. For more info on the gaskets, read on.

Insertion Rubber Flange Gaskets to Suit ANSI Size Info.

This style of gasket is designed to sit inside the bolts of the flanges and is known by quite a few names, including:

  • RF Flange Gaskets.
  • IBC Gaskets (Inner Bolt Circle).
  • Raised Face Gaskets (as they are often used on raised face type flanges).
  • Ring Face Gaskets.

These gaskets are all cut to suit the size requirements of ANSI B16.21 and used with ASME B16.5 Flanges. This specification contains 5 different flange tables listed below:

  • ANSI 150 (Class 150)
  • ANSI 300 (Class 300)
  • ANSI 600 (Class 600)
  • ANSI 900 (Class 900)
  • ANSI 1500 (Class 1500)

Ii many nominal pipe sizes (NB), the Class 300 and Class 600 call for the same size gasket. The same is true with Class 900 and Class 1500. When this is true, a single gasket is offered that will fit both (denoted on the list as Class 300 / 600). When the specification calls for different size gaskets, individual options for each are listed.

What this means in practice is…

ANSI 150
Does not share it’s sizing with any other flange table at any nominal bore.

ANSI 300
Shares it’s sizing with ANSI 600 up to 80NB (3”). For pipes larger than this, individual gaskets are offered as the sizes differ.

ANSI 600
Shares it’s sizing with ANSI 300 up to 80NB (3”). For pipes larger than this, individual gaskets are offered as the sizes differ.

ANSI 900
Shares it’s sizing with ANSI 1500 up to 65NB (2.5”). For pipes larger than this, individual gaskets are offered as the sizes differ.

ANSI 1500
Shares it’s sizing with ANSI 900 up to 65NB (2.5”). For pipes larger than this, individual gaskets are offered as the sizes differ.

Ring Face Flange Gaskets to suit ANSI B16.5 Flanges Size Tables.

Though this page only lists ANSI 300 and ANSI 600 Gaskets, we decided to include the size tables for all the main ANSI specs here for comparisons sake. 

ANSI 150 ButtonANSI 300 ButtonANSI 150 ButtonANSI 900 ButtonANSI 1500 Button

Class 150 Ring Gasket Sizes.

All Dimensions below are given in millimeters (mm).

Flange Nominal
Bore
Imperial
Short-Hand
Gasket ID Gasket OD Matches
Table
15NB 1/2" 21 48 -
20NB 3/4" 27 57 -
25NB 1" 33 67 -
32NB 1 1/4" 42 76 -
40NB 1 1/2" 48.4 86 -
50NB 2" 60.3 105 -
65NB 2 1/2" 73 124 -
80NB 3" 89 136.5 -
90NB 3 1/2" 102 162 -
100NB 4" 114.3 175 -
125NB 5" 141.3 197 -
150NB 6" 168 222 -
200NB 8" 219 279 -
250NB 10" 273 340 -
300NB 12" 324 410 -
350NB 14" 356 450 -
400NB 16" 406 515 -
450NB 18" 457 550 -
500NB 20" 508 605 -
600NB 24" 610 715 -

Return to Sizing Table Menu.

Class 300 Ring Gasket Sizes.

All Dimensions below are given in millimeters (mm).

Flange Nominal
Bore
Imperial
Short-Hand
Gasket ID Gasket OD Matches
Table
15NB 1/2" 21 54 ANSI 600
20NB 3/4" 27 67 ANSI 600
25NB 1" 33 73 ANSI 600
32NB 1 1/4" 42 83 ANSI 600
40NB 1 1/2" 48.4 95 ANSI 600
50NB 2" 60.3 111 ANSI 600
65NB 2 1/2" 73 130 ANSI 600
80NB 3" 89 149 ANSI 600
90NB 3 1/2" 102 165 -
100NB 4" 114.3 181 -
125NB 5" 141.3 216 -
150NB 6" 168 251 -
200NB 8" 219 308 -
250NB 10" 273 362 -
300NB 12" 324 422 -
350NB 14" 356 486 -
400NB 16" 406 540 -
450NB 18" 457 597 -
500NB 20" 508 654 -
600NB 24" 610 775 -

Return to Sizing Table Menu.

Class 600 Ring Gasket Sizes.

All Dimensions below are given in millimeters (mm).

Flange Nominal
Bore
Imperial
Short-Hand
Gasket ID Gasket OD Matches
Table
15NB 1/2" 21 54 ANSI 300
20NB 3/4" 27 67 ANSI 300
25NB 1" 33 73 ANSI 300
32NB 1 1/4" 42 83 ANSI 300
40NB 1 1/2" 48.4 95 ANSI 300
50NB 2" 60.3 111 ANSI 300
65NB 2 1/2" 73 130 ANSI 300
80NB 3" 89 149 ANSI 300
90NB 3 1/2" 102 162 -
100NB 4" 114.3 194 -
125NB 5" 141.3 241 -
150NB 6" 168 267 -
200NB 8" 219 320.7 -
250NB 10" 273 400 -
300NB 12" 324 457 -
350NB 14" 356 492 -
400NB 16" 406 565 -
450NB 18" 457 613 -
500NB 20" 508 683 -
600NB 24" 610 791 -

Return to Sizing Table Menu.

Class 900 Ring Gasket Sizes.

All Dimensions below are given in millimeters (mm).

Flange Nominal
Bore
Imperial
Short-Hand
Gasket ID Gasket OD Matches
Table
15NB 1/2" 21 64 ANSI 1500
20NB 3/4" 27 70 ANSI 1500
25NB 1" 33 79 ANSI 1500
32NB 1 1/4" 42 89 ANSI 1500
40NB 1 1/2" 48.4 98 ANSI 1500
50NB 2" 60.3 143 ANSI 1500
65NB 2 1/2" 73 165 ANSI 1500
80NB 3" 89 168 -
90NB 3 1/2" N/A N/A -
100NB 4" 114.3 206 -
125NB 5" 141.3 248 -
150NB 6" 168 289 -
200NB 8" 219 359 -
250NB 10" 273 435 -
300NB 12" 324 498 -
350NB 14" 356 520 -
400NB 16" 406 575 -
450NB 18" 457 638 -
500NB 20" 508 699 -
600NB 24" 610 840 -

Return to Sizing Table Menu.

Class 1500 Ring Gasket Sizes.

All Dimensions below are given in millimeters (mm).

Flange Nominal
Bore
Imperial
Short-Hand
Gasket ID Gasket OD Matches
Table
15NB 1/2" 21 64 ANSI 900
20NB 3/4" 27 70 ANSI 900
25NB 1" 33 79 ANSI 900
32NB 1 1/4" 42 89 ANSI 900
40NB 1 1/2" 48.4 98 ANSI 900
50NB 2" 60.3 143 ANSI 900
65NB 2 1/2" 73 165 ANSI 900
80NB 3" 89 175 -
90NB 3 1/2" N/A N/A -
100NB 4" 114.3 210 -
125NB 5" 141.3 254 -
150NB 6" 168 283 -
200NB 8" 219 352 -
250NB 10" 273 435 -
300NB 12" 324 520 -
350NB 14" 356 580 -
400NB 16" 406 641 -
450NB 18" 457 705 -
500NB 20" 508 755 -
600NB 24" 610 901 -

Return to Sizing Table Menu.

Colour Black
Insertion Cotton
Polymer NR/SBR (Natural Rubber / Styrene Butadiene Rubber)
Hardness 60 Shore A (+/- 5) Durometer
Continuous Operating Temperature 0°C to 70°C
Elongation at Break 300%
Tear Strength 12 N / mm
Specific Gravity 1.55
Potable Water No
Food Grade No
Abrasion Resistance High
Hydrocarbon and Fuel Resistance Low
Tearing Resistance High
UV / Sunllight Resistance Medium
SKU SWM000005P06-300-600