Nord-Lock Locking Washers, Miscellaneous Outfits

Drilling and Well Control Equipment

Miscellaneous Outfits

Nord-Lock Locking Washers

Product Description

NORD-LOCK washers are designed to prevent or minimize dynamic-, vibration- and impact-induced loosening of fasteners.
Each NORD-LOCK locking washer consists of a pair of washers that have inclined cams on the internal mating faces and radial tooth on the washer external bearing faces. The washers’ incline cam angle is greater than the lead angle of the fastener thread (i.e. the rise of the cams is greater than the pitch of the thread).
When the fastener is tightened, the tooth on the external surfaces of NORD-LOCK washers grip and penetrate in the mating surfaces of the bolt head, nut and joint material, and lock the washers in place.
If the nut tries to turn loose, the mating cams have to climb upon each other; the pair of washers tends to expand and results in an increase tension in the fastener. This prevents further rotation of the nut and, hence, loosening of the fastener.
Two NORD-LOCK washers are normally glued together with cam face on cam face and supplied pre-assembled. A pair of pre-assembled NORD-LOCK washers is hereafter referred to simply as NORD-LOCK washer.
NORD-LOCK washers can be classified as free running, preload dependent locking devices. Bolted connections fitted with NORD-LOCK washers do not require use of any additional appliances such as a lock wire, cotter pins, welding, jam nuts, adhesives, etc. to mechanically or chemically lock the nut and bolt together. Neither do they require application of any offset or distorted threads, slotted nuts, nor use of any non-metallic inserts to prevent self loosening of fasteners.

Product Ratings

Not Available / To be Updated

Applicable Standards

Not Available / To be Updated