The national standard for gaskets and resilient gaskets (including spring gaskets and toothed lock gaskets) has changed considerably in recent years.

Standard number for flat gasket: ASME B8.221 has been cancelled. Flat gasket is combined with elastic gasket using one standard number ASME e18.21.1-2009.

The national standards for ASME H18.8.1 and ASME B18.8.2 for products sold in the United States remain unchanged

Including the following criteria

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According to the actual needs of domestic fastener production and export enterprises, as well as related units and technical personnel, there are

The gasket closure section is described in more detail (with only a brief explanation of ASTM F2437), and ASTM f844-00 is added

Non-hardness requirements for steel gaskets and ASTM f436m-11 "float hard steel gaskets (metric series)". Yeah, the last two

The standard of the pin has been cut down to introduce only part of the content

Refer to ASME b821.1-2009 "spring washer, toothed lock washer and peace washer" for explanation and introduction

General requirements for all gaskets

1. Scope of application

(1) the range of sizes applicable to this standard is: spring washer 0#~3in toothed lock washer 2#-1%in; Flat washer

The 0#~3in standard covers the size range, physical properties and relevant test methods of the product

(2) the size information included in this standard does not mean that all the listed products are stock products

The manufacturer should be consulted.

2. Relevant ISO standards

There is no ISO standard for inch series spring washers, toothed lock washers and plain washers

3. Washer type

(1) spring washer: spring washer includes the following four types: ordinary spring washer, heavy-duty spring washer and extra-large spring pad

Ring high rotation type spring washer (equivalent to lightweight spring washer in China and Germany)

(2) toothed locking washer: toothed locking washer includes the following types: inner teeth locking washer, outer teeth locking washer and tapered outer teeth

Lock washers and internal/external teeth lock washers are called type A and type B tooth shapes

(3) plain washer: plain washer is available in the following three types: type A washer, type B washer and protective washer

Size 4.

The dimensions specified in this standard are all in and are applicable to pre-coating processes

5. The responsibility of the restructuring

The manufacturer shall not be liable for defects resulting from electroplating or other changes that are not under the manufacturer's control or direction

Responsible.

6. The term

For gasket terms, see ASME B18.12

Of 7.

All inspections shall comply with the following requirements. The concept of batch is: same kind, same grade, same type, same surface treatment, same phase

All products of the same specification, same process, same heat treatment and made of the same material shall be made at the same time

Deliver all products for inspection and testing. The maximum number of batches is the total number of products produced in a shift.

If the user has no other requirements, for the non-hardness requirements flat gasket, there is no batch requirements and requirements, there is no maximum volume concept.

Note: due to the general flat gasket without hardness requirements are generally made of scrap steel plate, the material is not traceable.

8. Inspection and quality assurance

The gasket shall be free from burr, rust, flash, and other defects that may affect service.

Unless otherwise specified, the quality inspection shall comply with the ASME E18.18.2 standard.