Heatproof 347SS ASME B16.20 O Ring Gaskets

Place of Origin china
Brand Name Wenzhou Jingwei Seal Technology Co., Ltd.
Certification ISO9001
Model Number oval ring joint gasket
Minimum Order Quantity 10
Price Negotiable
Packaging Details Bulk packaged or Customize
Delivery Time 7 work days
Supply Ability 100000pcs/month
Product Details
Carbon Steel Gasket Stainless Steel Seal
Metal Seals Ring Soft Iron Gasket
Temperature -200~800(℃) Delivery In Stock
Standard APi 6a Pressure High Pressure
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ASME B16.20 o ring gaskets


347SS metal seal ring


ASME B16.20 metal seal ring

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Product Description


Bonnet Seal Ring Gasket Sizes

We currently offer bonnet gaskets for Type MS check valves in two sizes:

1-13/16” - 2-1/16” 5M-20M

3-1/16” - 4-1/16” 5M-20M

If you need help identifying the size needed, please contact us for personal assistance. We may also have compatible parts in stock that aren’t currently listed.

Competitive Pricing on Quality Bonnet Gaskets

Replacement parts for the oil and gas industry don’t have to be expensive. Heshka Oil has made a name in the industry by producing a variety of equipment that meets API standards using high-grade materials that can withstand the workload. By bringing the order and distribution process online we’re able to cut costs and pass the savings on to our customers.

API 6A Monogrammed MS Check Valves


Primary features:

1. Resistance to high temperature and pressure, suitable for high pressure flange

2. Excellent temperature resistance. Permanent temperature range -200℃to +550℃

3. Very high operating pressure limits (320 bar)

4. Good chemical resistance

5. High-grade, reinforced and blow out safe gasket as per UW (Healty and safety at Work Act), high operating safe

6. Very low leakage rate, meets TA-LUFT requirement

7. No ageing, no embitterment, even at high temperature

8. Asbestos-free, physiologically harmless, disposal with domestic waste

9. Good handling during transport, installation and removal. Mechanically stable, scratch-resistant


Related products:

ASME B16.20 Ring Joint Gaskets, API 6A Ring Joint Gaskets, API 17D Ring Joint Gaskets, Non-standard Ring Joint Gaskets

We can offer more than 30 kinds of materials, such as 321SS, 347SS, 316SS, 304SS, Inconel 625, Monel 400, INCOLY 825, Nickel 200, Duplex F44, soft iron, low carbon steel and so on. We have over 10 years experience in export business. Our products are sold to Southeast Asia, Middle East, Europe and America and well appreciated by our clients.


Heatproof 347SS ASME B16.20 O Ring Gaskets 0

Thus Gasket supplies ring joint gaskets (RTJ Gasket) with the hardness numbers as follows:





Soft iron 90 56 D
Low carbon steel 120 68 S
4-6% Chrome 1/2% molybdenum 130 72 F5
304 Stainless Steel 160 83 S304
316 Stainless Steel 160 83 S316
347 Stainless Steel 160 83 S347


Material Identification Material No. Hardness Temperature (oC)
Min Max.
Soft Iron D 90 -40 500
Low Carbon Steel S 120 -40 500
Stainless Steel 304 304SS 1.4301 160 -250 550
Stainless Steel 304L 304L SS 1.4306 160 -250 550
Stainless Steel 316 316SS 1.4401 160 -100 550
Stainless Steel 316L 316L SS 1.4404 160 -100 550
Stainless Steel 321 321SS 1.4541 160 -250 550
Stainless Steel 347 347SS 1.4450 160 -250 500
Stainless Steel 410 410SS 1.4000 170 -20 850
Aluminum Al 3.0255 30 -250 300
Copper Cu 2.0090 ca.80 -250 400
Brass CuZn37 2.0321 ca.60 -100 350
Nickel 200 Ni200 2.4066 110 -250 600
Monel 400 400 2.4360 150 -125 600
Inconel 600 600 2.4816 150 -100 950
Hastelloy B2 B2 2.4617 230 -200 450
Titanium Ti 3.7025 ca.215 -250 350

Marking and Identification (standard):

The outer surface of each Ring Type Joint should show the manufacturer’s name or a trademark, the gasket number like R67, RX37 or BX155, gasket’s material in abbreviation(check below our chart), as well as the standards like ASME B16.20, API 6A, API 17D, etc.



RTJ gaskets are available as standard in soft metal and in 304, 316 and stainless steels. Versions in other materials on request.

Standards and approvals

All RTJ gaskets are manufactured to API standards, guaranteeing consistent quality.

Recommended applications


  • Oil & gas industry
  • Petrochemical industry
  • Flange connections
  • Pipe connections

Functional description

Under axial compressive load, ring type joints plastically deform and flow into the irregularities of the flange groove. Since the contact area of the ring type joint is relatively small, a very high compressive load results between the sealing surface of the ring type joint and the flange groove. This surface pressure is further increased especially by the RX and BX RTJ variants. Both variants are able to seal extremely high internal pressures. RTJ gaskets are produced from metal, so they remain in their compressed form, even when the surface pressure is relaxed. The sealing function of the RTJ gasket is reinforced by the axial forces acting on the sealing surfaces.

Forms of supply

  • Standard dimensions as per DIN EN 12560-5 or ASME B16.20
  • RTJ gaskets are available from stock in ½” to 36” and 15 mm to 900 mm sizes, and in the commonly available materials to suit most ASME and DIN flange dimensions. Larger sizes and special requirements are available to order.Heatproof 347SS ASME B16.20 O Ring Gaskets 1
  • FAQ


    Q: Are you trading company or manufacturer ?

    A: We are a professional production enterprise

    Q: How long is your delivery time?

    A: Generally it is 7-15 days for stock delivery, and 15-30 days for manufacturing goods , but it depands on the quantity.

    Q: Do you provide samples ? is it free or extra ?

    A: Yes, we can provide you sample, but you need to pay for the sample and freight firstly.We will return the fee after you make an order.

    Q: What is your terms of payment ?

    A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.

    Q:How can we trust you to make a guaranteed deal?
    A:We can trade through alibaba credit guarantee orders, which will fully guarantee the effective rights and interests of buyers and sellers.

    Q:Package information?

    A:For inner box and master carton are made as per international standards,and we can make special designed for you if need.


    If you have another question, pls feel free to contact us.