Plain Stainless Steel Crinkle Locking & Anti-Vibration Washer, M4, A2 304

RS Stock No.:

Technical Reference

Legislation and Compliance

RoHS Certificate of Compliance

RS Components
RoHS Certificate of Compliance

EU Directives 2011/65/EU and 2015/863 restrict the use of the 10 substances below in the manufacture of specified types of electrical equipment.

Whilst this restriction does not legally apply to components, it is recognised that component “compliance” is relevant to many customers.

RS definition of RoHS Compliance:

  • The product does not contain any of the restricted substances in concentrations and applications banned by the Directive,
  • and for components, the product is capable of being worked on at the higher temperatures required by lead–free soldering

The restricted substances and maximum allowed concentrations in the homogenous material are, by weight:

PBB (Polybrominated Biphenyls)0.1%
PBDE ( Polybrominated Diphenyl Ethers)0.1%
Hexavalent Chromium0.1%
DEHP (Bis (2-Ethylhexl) phthalate)0.1%
BBP (Benzyl butyl phthalate)0.1%
DBP (Dibutyl phthalate)0.1%
DIBP (Diisobutyl phthalate)0.1%

The supplier of the item listed below has informed RS Components that the product is "RoHS Compliant".

RS Components has taken all reasonable steps to confirm this statement. Information relates only to products sold on or after the date of this certificate.

Compliant Product Details
RS stock number 0428650
Product description Plain Stainless Steel Crinkle Locking & Anti-Vibration Washer, M4, A2 304
Manufacturer / Brand RS PRO

RS Components Ltd, Birchington Road, Corby, Northants, NN17 9RS, UK

Statement of Conformity

RS Components
Statement of Conformity

This statement confirms that the product detailed below complies with the specifications currently published in the RS media and has been subject to the strict quality conditions imposed by RS Components’ internal management systems. Furthermore and where applicable, it confirms that all relevant semiconductor devices have been handled and packed under conditions that meet the administrative and technical requirements of ANSI/ESD S20.20 and EN61340-5-1 electrostatics control standards.

Compliant Product Details
RS stock number 0428650
Product description Plain Stainless Steel Crinkle Locking & Anti-Vibration Washer, M4, A2 304
Manufacturer / Brand RS PRO

The foregoing information relates to product sold on, or after, the date shown below.


Date Jun 13, 2024

RS Components Pte Ltd Robinson Road, P.O. Box 1582, Singapore 903132

Country of Origin: GB

Product Details

RS PRO A2 Stainless Steel Crinkle Washer

RS PRO Stainless Steel Plain Washers
From the trusted RS PRO Brand, these stainless steel crinkle washers are generally used with a machine threaded fastener and nut to spread the load over a greater surface area when tightening a bolt, screw or nut. As they are made from A2 stainless steel, they have an element of corrosion resistance that ensures long life and suitability for some specialistic environments such as food production.

How do they work?

RS PRO crinkle washers have advantages over plain washers in that they provide an element of locking and vibration resistance in a fastener, while still fulfilling the purposes of a plain washer, namely spacing and distributing load between the fastener and material and prevent the wear and distortion of installation surfaces over time.

Available in the following sizes;

428-616 is an M2 A2 Stainless Steel Crinkle Washer
428-622 is an M2.5 A2 Stainless Steel Crinkle Washer
428-638 is an M3 A2 Stainless Steel Crinkle Washer
428-650 is an M4 A2 Stainless Steel Crinkle Washer
428-666 is an M5 A2 Stainless Steel Crinkle Washer
428-672 is an M6 A2 Stainless Steel Crinkle Washer
428-688 is an M8 A2 Stainless Steel Crinkle Washer
428-767 is a 7/16 in A2 Stainless Steel Crinkle Washer
428-773 is a 1/2 in A2 Stainless Steel Crinkle Washer

Features and Benefits

• A2 stainless steel construction for durability
• Suitable for some locking and anti-vibration purposes
• Available in a range of sizes


RS PRO crinkle washers are a useful addition to any fastener assembly. They decrease the surface load when joining materials, and they're unique shape allows for a degree of vibration protection over time. You can use them to make maintenance easier by allowing for smoother loosening and tightening of components. Crinkle washers are commonly used in many electronic, food, chemical and construction applications.

What is the difference between a crinkle washer and a wave washer?

Wave and crinkle washers are often confused as they look quite similar, but they wave washers are shaped differently and used as spring washers, while crinkle washer are more suitable for spacing applications.


RS PRO aims to be your go-to brand for reliability and value for money. We source great parts at great prices and test everything with our in-house experts to ensure the quality you need. When it comes to tools and fasteners, we know that versatility and dependability are what you need. As such, we stock a variety of mainstay and specialist fasteners and couplers to suit any application. Whether you're a professional electrician, plumber, builder or DIY enthusiast, RS PRO is here to support you.


Attribute Value
Brand RS PRO
Outside Diameter 7.99 mm
Finish Plain
Inside Diameter 4.36 mm
Material Stainless Steel
Thickness 0.28 mm
For Screw/Bolt Size M4
Stainless Steel Type A2 304
Washer Type Crinkle
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