STAINLESS STEEL SQUARE SECTION SPRING WASHERS DIN 7980

Square Section Spring Washers DIN 7980 — DIN 7980 follows the same split-coil principle as DIN 127 - a helical ring, cut through at one point, that compresses under tightening and stores spring energy while its cut ends bite into the bearing faces - but with a square rather than rectangular cross-section. That change in section shape increases the material volume for a given nominal size, which raises the spring rate and the amount of energy the washer can store, giving a stronger resistance to loosening than the equivalent DIN 127 washer at the same bolt diameter. That extra margin makes DIN 7980 the natural upgrade wherever vibration or dynamic loading is more than nominal - machinery subject to continuous running vibration, or assemblies where a DIN 127 has previously proven marginal - without stepping all the way up to a dedicated locking device. It isn't, however, a substitute for a positive locking method: like any split lock washer, repeated compression cycles gradually reduce its stored spring energy through fatigue, so while it can be reused occasionally, it is not recommended for joints that are stripped and rebuilt often, and for safety-critical or highly dynamic assemblies, a nylon insert nut or thread-locking compound remains the more dependable choice. Material selection is central to how well a spring washer actually performs: carbon spring steel gives the best fatigue life and spring characteristics, which matters most in continuously vibrating machinery, while A2 (304-equivalent) stainless is the right call once corrosion resistance becomes the priority - general outdoor or washdown environments - accepting a slightly softer spring performance in exchange. A4 (316-equivalent) is worth the added cost specifically where the assembly also faces chloride exposure or aggressive cleaning chemicals, common in food-processing or marine machinery. To specify correctly, match the bore to the fastener diameter and choose DIN 7980 over DIN 127 specifically where the joint's vibration environment justifies the higher spring rate.

FAQs
Is DIN 7980 a substitute for a nylon lock nut or thread-locking compound?
It provides a supplementary mechanical locking effect but is not equivalent to a positive locking method; for safety-critical or highly dynamic joints, a nylon insert nut or chemical thread locker is generally more reliable.

How can I tell a DIN 7980 washer apart from a DIN 127 on sight?
The square-edged profile is visibly chunkier and squared-off compared with DIN 127's slimmer, more rectangular coil; if in doubt, check the section thickness against the two standards' tables.

What are DIN 7980 washers used for?
They are used in mechanical and general engineering assemblies where a stronger spring lock washer is preferred over the standard DIN 127 type, particularly under vibration or dynamic loading.