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Better Fastener Industry Co., Ltd. is a China-based Spring Washers manufacturer producing split lock, wave, curved and disc spring washers in spring steel and stainless steel. Our range covers DIN, ASME/ANSI and JIS dimensional families, supplied as standard parts or built to drawing for automotive, machinery, electrical and outdoor equipment joints.
What Spring Washers Do in a Bolted Joint
A spring washer is a split or formed elastic disc that stores mechanical energy when compressed. Under vibration, thermal cycling or dynamic loading, it maintains contact pressure between the fastener and the joint face instead of letting preload decay.
The split ends bite into the nut bearing face and the substrate as the joint is tightened, creating a frictional and mechanical barrier against backward rotation. Spring recovery also compensates for small dimensional changes caused by thermal expansion and contraction.
- Anti-loosening: resists progressive loosening in continuously cycled joints.
- Preload retention: keeps clamping force stable where flat washers alone would relax.
- Bearing protection: spreads load and limits surface damage on softer joint faces.
- Compensation: absorbs small gaps, creep and thermal movement in the assembly.
Our Spring Washer Range
We produce the main elastic washer families used across general engineering, so a single purchase order can cover several joint types without splitting supply between vendors.
| Product family | Reference standard | Typical application fit |
|---|---|---|
| Socket head cap spring washer | DIN 7980:1987 | Socket head cap screws in machine frames, tooling and enclosures |
| Heavy spring washer | ASME/ANSI B18.21.1 (T2):2009 | Heavy-duty inch-series joints, structural and equipment bolting |
| Wave spring washer | DIN 137 (B):1994, JIS B 1251 (WW/No.3):2018 | Low-height preload in bearings, covers and compact assemblies |
| Curved spring washer | DIN 137 (A):1987, DIN 128 (A):1994 | Light axial take-up and clearance compensation |
| Disc spring washer | DIN 2093 (B):2013 | High load in a short axial envelope, die and press applications |
| Lock washer | DIN 9250 (S) | Positive locking where rotation must be blocked mechanically |
Related washer families in our catalogue include Plain Washers for load distribution and Lock Washers for positive retention, so a joint can be specified as a complete stack rather than a single item.
Materials and Surface Treatment
Spring washers depend on elastic behaviour, so material selection and heat treatment matter more than on a plain flat washer. We work in spring steel and stainless steel, with zinc plating and stainless grades for corrosive environments.
- Spring steel: the standard choice where elastic recovery and cost efficiency drive the specification.
- Stainless steel: for outdoor machinery, marine-adjacent equipment and wash-down areas.
- Zinc plating: applied where carbon steel parts need corrosion protection in indoor or sheltered service.
- Post-treatment: hot-dip galvanizing and blackening are available for complex shapes and mixed-material orders.
Where a joint combines stainless fasteners with carbon steel washers, or where galvanic pairing matters, we confirm the material combination before production rather than after.
Sizing, Load and Fit Considerations
Spring washer selection is driven by the fastener size, the required axial force and the space available between the bearing face and the joint. A wave or curved washer fits a shallow envelope; a disc washer delivers higher load in the same height.
| Selection input | Why we need it |
|---|---|
| Bolt or screw diameter and thread pitch | Sets the nominal bore and outside diameter of the washer |
| Joint type and clamping load | Determines whether a split, wave, curved or disc form is appropriate |
| Available axial height | Constrains free height and therefore the achievable spring travel |
| Service environment | Drives material grade and coating choice |
| Assembly method | Hand, pneumatic or automated feeding affects packaging and orientation |
Where Our Spring Washers Are Used
Our products serve rail transportation, automotive manufacturing, construction machinery, mining and agricultural equipment, shipbuilding, petrochemicals, building and furniture hardware, and power accessories. Spring washers appear in most of these assemblies because cyclic loading is present in nearly all of them.
- Automotive and new energy vehicles: chassis, brackets and electrical connections subject to vibration.
- Outdoor machinery: equipment exposed to weather where stainless or plated parts are required.
- Electrical panels: terminal and busbar joints where preload must remain stable.
- Construction and mining equipment: high-vibration joints on GET parts and structural connections.
Custom and Drawing-Based Production
Customized production is core to our business. We develop and manufacture spring washers from drawings or physical samples, including non-standard diameters, thicknesses, free heights and material grades that are not covered by a published standard.
Our engineering team reviews the drawing for spring geometry, material and coating before quoting. Where a customer supplies a sample, we measure and confirm the critical dimensions back before tooling or production begins.
Quality Control and Acceptance
We implement total quality management through the production process, with inspection after each operation and full final inspection of finished products against customer requirements and international standards.
- Spectrometer checks for chemical composition.
- CMM measurement for geometric dimensions.
- X-ray flaw detection and mechanical property testing.
- In-house laboratory covering composition, properties, non-destructive testing and dimensions.
Our quality system is certified to ISO 9001, and inspection records can be prepared alongside the shipment for customer acceptance procedures.
Packing, Logistics and Delivery Scope
Spring washers are supplied in bulk cartons, retail kits, blister packs, custom boxes or export cartons depending on the sales channel. We consolidate washers with Hexagon Nuts and other fasteners into one shipment where the project calls for a complete kit.
Our facility is within a two-hour drive of Shanghai and Ningbo ports, with sea freight as the main mode and air freight available for urgent deliveries. DDP delivery direct to the customer's door is available where it simplifies the receiving process.
Information We Use to Configure Your Solution
To prepare an accurate spring washer quotation, we work from the following project inputs. Where a drawing or sample exists, that takes priority over a verbal description.
- Standard reference (DIN, ASME/ANSI, JIS) or a dimensioned drawing.
- Nominal size, outside diameter, thickness and free height.
- Material grade and required surface finish or coating.
- Annual volume, batch size and delivery schedule.
- Packing format and labelling requirements.
- Inspection documentation and acceptance criteria.
Frequently Asked Questions
Are you a spring washer factory or a trading company?
We are a direct manufacturer with independent production capacity. Better Fastener was founded in 2001 as a washer factory and expanded in 2010 into a comprehensive fastener enterprise covering washers, nuts, bolts and spring nuts, with our own international sales department handling export.
Which standards can you produce to?
Our spring washer range includes DIN 7980, DIN 137 (A) and (B), DIN 128 (A), DIN 2093 (B), DIN 9250 (S), ASME/ANSI B18.21.1 (T2) and JIS B 1251 (WW/No.3). Non-standard sizes are produced from drawings or samples.
What materials and coatings are available?
Spring steel and stainless steel are the standard materials, with zinc plating for carbon steel parts and stainless grades for corrosive environments. Hot-dip galvanizing and blackening are also available as post-treatment processes.
How is quality verified before shipment?
Inspection is carried out after each production process, and finished products undergo final inspection against customer requirements and international standards. Our laboratory is equipped with a spectrometer, CMM and X-ray flaw detector for composition, dimensional and non-destructive testing.
Can spring washers be combined with other fasteners in one order?
Yes. We consolidate washers with bolts, nuts and other fasteners into a single supply program, and can pack them as retail kits, blister packs or export cartons according to the sales channel.
What is the typical production capacity for large orders?
We operate 12 energy-efficient production lines, including one fully automatic shell molding line and four heat treatment lines, with annual capacity exceeding 20,000 tons. This supports stable delivery for large-volume orders while remaining responsive to small and medium batches.
