Conversion Chart

Lock Washer Ext Serr TH 304 SS M12x20.5x1.0

DIN 6798 Type A LOCK / A2 - M12 (Box=100)
Stock Code:
WL04SEM12
$0.41 incl GST

Stock Locations

  • Ballarat:
    Special Order
Make an Enquiry
Add to Favourites

Description

DESCRIPTION

Lock Washer External Serrated Tooth 304 Stainless Steel M12x20.5x1.0

(Price per unit)

Serrated lock washers are designed to help stop a bolted connection from loosening under vibration or repeated loading conditions.

  • Tooth Lock Washers feature serrated edges either on the outer circumference (external tooth) or around the inner hole (internal tooth).
  • The serrated teeth grip the bolt head and the contact surface when clamped, helping prevent loosening caused by rotation.
  • They provide stronger locking action compared with traditional split spring washers.
  • External tooth washers:
    • Offer maximum surface grip due to teeth engaging the work surface.
    • May leave visible marks on the surface.
  • Internal tooth washers:
    • Sit beneath the bolt head, keeping the teeth less visible.
    • Provide a cleaner appearance with reduced surface marking.
  • Common standards include:
    • DIN 6797 – External tooth lock washers.
    • DIN 6798 – Internal tooth lock washers.
    • IFI 532 – Industrial fastener standard.

Applications / uses

A washer designed to help prevent a bolted connection from working loose during vibration or repeated loading.

It achieves this by adding extra resistance through either spring tension or gripping features such as serrated surfaces, working alongside the bolt’s normal clamping force.

These washers are commonly used in applications where a conventional flat washer and the bolt’s preload alone may not provide sufficient joint security, including engines, industrial machinery, vehicle components, and rotating equipment.

Note: Lock Washers must be selected to match a compatible material system to ensure proper strength and performance. ie stainless steel with stainless steel, zinc plate with zinc plate.

Product
LOCK WASHER EXT SERR TOOTH
 
Finish
304 STAINLESS
Stainless Steel A2-70 G304 is the most popular grade of stainless steel. It is very practical because of its excellent corrosion protection in most environments.
 
Size
M12
 
Specification / Reference
DIN 6798 Type A LOCK / A2
 
Length / Dimension
x20.5x1.0
 
 
Click here for hobson washers product guide
  
Click here for hobson types of washers
 
Click here for washers selection guide
 
Click here for washer gauge conversion chart
 
Click here for hobson anti vibration paper
 
Click here for common misconceptions about stainless steel