the Standard Type-Shanghai Raido Machinery & Technology Co., Ltd

Metal hollow O-ring

the Standard Type

Our main business are metal o-ring/metal c-ring/PTFE bonded EPDM gasket/rubber gasket/E-PTFE gasket. We can do research on new materials and make new seal types or adapt our standard types of seals in order to meet the customers needs.

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TYPICAL APPLICATIONS

Vacuum and ultra-high vacuum

Plastic mouldings

Accelerators

Research laboratories

Reactors and nuclear installations

Diesel and other engines

Aerospace

Oil and petrochemical industries

Hydraulics

Valves, pumps, compressors

Turbines

Boilers and heat exchangers

Chemical industries

Iron and steel industries

All applications where the use of elastomer seals are restricted by temperature, corrosion,radiation, pressure, gas permeability and life requirements.

FLEXIBILITY

Very short delivery terms, special rush delivery service within one or two weeks

Seals in any size (starting from 5mm), in any required quantity.

Products according to the customers’ requirements.

Very short response time on customers demands

(standard l day).

Competitive pricing.

Wide range of standard materials.

EXPERTISE

Know-how: Specialists with more than 20 years of experience.

In house testing: Mechanical properties, new materials and production methods.

Customer support :Thinking with customer.

R&D: U-rings, E-rings, Custom designed seals, innovation.

Direct contact with technical staff.

We can do research on new materials and make new seal types or adapt our standard types of seals in order to meet the customers needs.

Material and Coating

	Material	Inherent heat resistance limit（℃）	Surface roughness of flange groove
Material	sus321	-250∽371	＜0.4μm
Material	Inconel 600	-250∽538	＜0.4μm
Material	Inconel X-750	-250∽975	＜0.4μm
Coating	PTFE	-200∽260	0.4μm-0.8μm
Coating	Silver	-250∽425	0.4μm-1.6μm
Coating	Gold	-250∽650	0.4μm-1.6μm
Coating	Nickel	-250∽870	0.4μm-0.8μm

Groove dimensions

tube outside dia. [mm]	Ring diameter	groove depth	groove width	groove outside	groove inside	Rmax
φ 0.9	φ 6～φ40	0.7±0.04	1.5	D + 0.07～0.15	d - 0.07～0.15	0.3
φ 1.6	φ 13～φ70	1.2±0.05	2.3	D + 0.10～0.20	d - 0.10～0.20	0.5
φ 2.4	φ 40～φ200	1.9±0.05	3.1	D + 0.15～0.25	d - 0.15～0.25	0.8
φ 3.2	φ 75～φ600	2.6±0.05	4.0	D + 0.20～0.35	d - 0.20～0.35	1.0
φ 4	φ 100～φ800	3.2±0.05	5.0	D + 0.20～0.40	d - 0.20～0.40	1.3
φ 4.8	φ 150～φ1000	3.8±0.05	6.2	D + 0.25～0.40	d - 0.25～0.40	1.6

Notes

The water pattern on the surface of the flange groove needs to be consistent with the circumferential direction of the sealing ring (turning surface)