How to find the right Wedge Lock Washers AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Wedge Lock Washers
- Cam angle versus thread pitch
- The pair's cam rise angle must exceed the bolt's thread pitch angle, and the manufacturer specifies which bolt sizes each washer suits. This geometry is what makes the joint tighten against itself when it tries to rotate loose.
- Install as a matched pair
- Install with the cam faces together and the serrated faces outward, and never mix halves from different pairs or brands. Mismatched or reversed halves do not lock.
- Hardness versus mating surface
- The washer's serrations must be harder than the bolt head, nut, and joint surface they bite into, so check the maker's guidance for hardened or very hard substrates. If the serrations cannot embed, the pair slips as a unit and does not lock.
- Vibration test evidence
- Prefer pairs documented under transverse vibration (Junker) testing such as DIN 65151. That test is the recognized way to show a locking method actually resists self-loosening.
- Material and size version
- Choose coated steel for general use and stainless for corrosive environments, and use enlarged outside-diameter versions for slotted holes or soft materials. Bearing area and corrosion resistance must match the joint, or the washer embeds too deeply or corrodes.
Brands that matter
- Nord-Lock: Originator of the wedge-locking pair, with extensive sizes, materials, and published test data.
- Heico (Heico-Lock): Long-established alternative wedge-lock washer line.
What to avoid
- Unbranded 'wedge lock' pairs with no stated standard, hardness, or test data
- Separating and mixing halves from different packs
- Using them without torquing the bolt to its specified preload
Questions
Can wedge lock washers be reused?
Genuine pairs are generally reusable if the cams and serrations are undamaged, but follow the specific manufacturer's guidance.