When sourcing DIN 127B spring lock washers, many buyers focus on inner diameter, outer diameter, material thickness, material grade and surface finish. Those details are important, but one dimension is easy to miss: the H dimension.
In this context, H is not simply the material thickness. It refers more closely to the free height or opening height after the spring lock washer is formed. It is the space left between the two raised ends of the washer, and it affects the washer's spring reserve and assembly behavior.
Why the H dimension is often missed
Many spring washer RFQs are written in a very short form:
- DIN 127B
- size
- carbon steel or spring steel
- zinc plated or black finish
- quantity
If the buyer does not clearly request the H dimension, free height, hardness or standard conformity, the quotation may be based on common market-grade spring washers. These products can be suitable for low-cost general applications, but they may not match projects where spring height and consistency matter.
Why low-cost supply chains can produce a lower H dimension
In some low-cost spring washer supply chains in North China, including parts of Shandong and Hebei, manufacturers may use thinner material close to the lower tolerance range to control cost. When the material is thinner, the forming process can also reduce the opening height between the two raised ends.
As a result, the washer may still look like a DIN 127B spring lock washer, but the actual H dimension may be lower than the buyer expects. For projects that require a confirmed standard level, this difference should be checked before bulk purchasing.
This is one reason why two suppliers may both quote "DIN 127B spring lock washers" but offer different prices and different real product performance.
H dimension is not the same as thickness
Material thickness is one dimension of the strip or formed washer. The H dimension is the free height after the split washer is formed. A buyer can receive washers with a similar nominal size and finish, but a different free height and spring reserve.
For this reason, buyers should not compare DIN 127B spring lock washers by unit price only. The comparison should include material thickness, free height, hardness, surface finish and batch consistency.
What to confirm in a DIN 127B RFQ
For machinery, construction, export orders or applications where locking performance matters, the RFQ should be more specific.
- Standard: DIN 127B
- Nominal size
- Material requirement
- Material thickness or standard conformity requirement
- H dimension / free height requirement
- Hardness requirement
- Surface finish
- Inspection report or sampling requirement
- Packing and batch consistency requirement
If spring performance is important, buyers may also request samples or pre-production confirmation before bulk orders.
A lower price is not always wrong
A lower unit price is not automatically a problem. For general market use, low-cost spring lock washers may be acceptable.
However, if the buyer needs DIN 127B spring lock washers with reliable spring reserve and consistent forming, price should not be the only comparison point. The H dimension, material thickness, hardness and forming consistency should be confirmed together.
A clear RFQ helps buyers avoid receiving washers that look similar but perform differently in real assembly.