Washers · DIN 127
DIN 127 Spring Washer
Accurate Fastners manufactures and supplies DIN 127 Spring Washers in sizes M4 through M36, offering the split helical ring geometry that helps resist loosening under vibration. Available grades are confirmed on enquiry with our sales team.
- Standard
- DIN 127
- Grades
- On enquiry
- Size
- M4 – M36
- Length
- —
Verification note: The brochure lists the size range only; available material grades require confirmation.
Overview
What is the DIN 127 Spring Washer?
DIN 127 is a German Institute for Standardisation specification for split helical spring washers, widely adopted across industrial assembly work. The standard defines the proportions of the split ring — inner diameter, outer diameter, thickness, and the angle of the helical split — to ensure consistent performance across compatible fastener systems. Accurate Fastners produces these washers to the DIN 127 specification, with the size range extending from M4 to M36.
The defining feature of a DIN 127 spring washer is its single-coil helical form, where one turn of a rectangular-section ring is cut and offset to create two sharp ends. When a nut or bolt head is tightened over this washer, the ring compresses and the sharp edges bite into both the bearing surface and the underside of the fastener. This elastic deflection stores energy that may help maintain clamping load as joint members settle.
Accurate Fastners has served customers across varied industries for 21 years, with a quality control team that performs checks during both procurement and delivery. The company's fastener range, which includes washers, nuts and bolts, screws, anchors, thread bars and pipe clamps, is produced to recognised standards including DIN, IS and BS. DIN 127 spring washers are stocked across the M4–M36 diameter range; specific grades and quantities are confirmed directly with the sales team.
In Depth
Product description
Construction and Geometry
A DIN 127 spring washer is formed from a flat rectangular-section strip coiled through one full turn and then split at an angle so that the two free ends are offset from each other by approximately one strip thickness. This offset creates the spring action. The inner diameter is sized to clear the corresponding bolt shank, and the outer diameter and thickness follow the proportions set by the DIN 127 table for each nominal metric thread size.
The cut ends are typically left square and relatively sharp rather than chamfered. Under load, these edges are intended to engage the mating surfaces. The washer material must carry a degree of elastic springiness so the ring can deflect during tightening and recover partially if clamping force relaxes. DIN 127 covers two series — Type A (standard) and Type B (heavy) — with Type B offering a slightly thicker section for higher-load applications.
Functional Behaviour in an Assembly
When a bolt is torqued down, the spring washer compresses progressively. The stored elastic energy in the partially flattened ring may continue to exert axial force on the nut or bolt head if the joint settles or if differential thermal expansion occurs between assembled components. This makes split helical washers a commonly specified choice in assemblies that experience moderate vibration, thermal cycling, or gradual creep in softer substrate materials.
It is important to note that the locking effect of a spring washer depends heavily on correct installation torque, surface condition, and the relative hardness of the mating parts. In highly dynamic or critical structural applications, engineering standards may require additional or alternative locking methods. Accurate Fastners recommends consulting the relevant assembly specification and, where needed, seeking independent engineering advice before finalising the fastener selection.
How DIN 127 Differs from Similar Washers
DIN 127 is specifically a split helical spring washer and should not be confused with plain flat washers (DIN 125/DIN 9021), which provide bearing area without any spring action, or with toothed lock washers (DIN 6797), which use multiple internal or external teeth rather than a single helical split. The helical split form typically offers a simpler and lower-profile locking mechanism compared to multi-tooth variants, though the two types are not interchangeable in most design specifications.
Compared to DIN 128, which is a curved or wave spring washer with a different cross-section geometry, DIN 127 provides a more aggressive edge-biting action due to its rectangular section and sharp cut ends. The choice between these types generally depends on the assembly's torque requirements, substrate hardness, and whether the priority is load distribution or vibration resistance. Both are distinct from structural plain washers used under bolt heads in steelwork connections.
Material & Grade
Material and grade information
The verified product data for this item does not list specific material grades. Available grades for Accurate Fastners' DIN 127 Spring Washers must be confirmed directly with the sales team at the time of enquiry. Stainless steel grades such as 202, 304 and 316 are commonly used in spring washer manufacture, and carbon steel or alloy steel variants are also widely produced, but only the grades confirmed by Accurate Fastners at enquiry should be relied upon for procurement.
In general engineering terms, stainless steel grades differ in corrosion resistance and mechanical properties: grade 304 is a widely used austenitic alloy offering good general corrosion resistance, while grade 316 includes molybdenum for improved resistance in chloride-containing environments. Grade 202 is a lower-nickel alternative sometimes used in less aggressive conditions. Carbon steel spring washers are typically hardened and may be zinc-plated. The appropriate material for your application should be confirmed with our sales team alongside the size and quantity requirement.
Grades shown are those documented for this product in the Accurate Fastners brochure. General material notes are guidance only; confirm grade selection for your environment.
Technical Data
Technical specifications
| Product type | Washer – DIN 127 Spring Washer |
|---|---|
| Material | To be confirmed on enquiry |
| Material grade | To be confirmed on enquiry |
| Applicable standard | DIN 127 |
| Nominal diameter / size | M4 – M36 |
| Head / form | Split helical ring |
Sizes
Available sizes
Documented size range
M4 – M36
Documented length range
Not applicable
Individual sizes within the documented range, thread pitches and lengths are confirmed at quotation stage.
Applications
Industrial applications
Submersible Pump Assemblies
Motor housings and pump casings in submersible pump manufacture commonly use spring washers to help maintain bolt clamping under the vibration generated during operation. Accurate Fastners supplies fasteners to this sector.
Solar Energy Mounting Structures
Racking systems for solar panels involve bolted joints that face wind-induced vibration and thermal expansion cycles. DIN 127 spring washers may be used to help preserve joint integrity in such installations.
Food and Beverage Machinery
Equipment frames and guards in food processing lines require reliable fastening that resists loosening during continuous machine operation. Specific grade selection for hygiene requirements should be confirmed with the Accurate Fastners sales team.
Pharmaceutical Machinery
Fabricated equipment frames, panels and access covers in pharmaceutical machinery may incorporate spring washers to maintain fastener preload through regular cleaning cycles and operational vibration.
LED Lighting Fixtures and Enclosures
Sheet-metal enclosures and luminaire housings in LED lighting products often use smaller-diameter spring washers, such as M4 to M8, to secure components that may be subject to handling vibration during transport and installation.
Featured for: Submersible Pump
Features & Selection
Features and selection considerations
Design features
M4 to M36 Size Range
The available diameter range covers small-equipment fastening at M4 through to larger structural sizes at M36, allowing Accurate Fastners to supply a broad spread of assembly requirements from a single source.
Split Helical Ring Form
The single-coil helical geometry with square-cut ends is the defining DIN 127 characteristic, providing both elastic spring deflection and edge engagement with mating surfaces during tightening.
DIN 127 Specification Compliance
Washers are produced to the DIN 127 standard, which defines inner diameter, outer diameter, thickness and split geometry for each metric thread size, supporting dimensional interchangeability with compliant fasteners.
Quality Checks at Procurement and Delivery
Accurate Fastners' quality control team performs checks at both the procurement and delivery stages, aimed at maintaining dimensional and material consistency across batches supplied to customers.
Manufactured from High-Quality Raw Materials
The company sources high-quality raw materials for its fastener range, which is relevant to the spring performance and surface condition of helical washers across their service life.
Before you order
Nominal Diameter Match
Select the washer nominal size to match the bolt or screw thread diameter — for example, an M10 DIN 127 washer pairs with an M10 bolt. Confirm the inner diameter tolerance is compatible with your bolt shank before ordering.
Material Grade Confirmation
Since the verified data does not list specific grades, contact Accurate Fastners' sales team with your environmental and mechanical requirements — such as exposure to moisture, chemicals or elevated temperature — before specifying a grade.
Type A or Type B Section
DIN 127 is available in standard (Type A) and heavy (Type B) sections. Confirm which section your assembly drawing or specification calls for, as the two differ in thickness and load capacity and are not freely interchangeable.
Quantity and Documentation
For project or bulk procurement, provide the nominal size, type, grade, quantity and any required material test certificate or compliance documentation when submitting your enquiry to ensure accurate quotation and lead-time confirmation.
FAQs
Frequently asked questions
What sizes of DIN 127 Spring Washers does Accurate Fastners supply?
The confirmed size range is M4 to M36. This covers the majority of general industrial assembly requirements. If you need a size outside this range or have a specific project requirement, contact the sales team to confirm availability.
Which material grades are available for these spring washers?
Available grades must be confirmed with Accurate Fastners' sales team at the time of enquiry, as specific grades are not listed in the current product data. Please share your application and environmental conditions so the team can advise appropriately.
What does the DIN 127 standard specify?
DIN 127 is a German standard that defines the dimensions — including inner diameter, outer diameter, thickness and helical split geometry — of split helical spring washers for metric bolt threads. It is widely referenced in industrial assembly specifications across multiple sectors.
Can DIN 127 spring washers be used with any type of bolt or nut?
DIN 127 spring washers are generally used beneath nuts or bolt heads on metric-threaded fasteners of the corresponding nominal size. The mating fastener standard, surface hardness and tightening torque all influence performance, so always refer to your assembly specification.
What other fasteners does Accurate Fastners supply that are commonly used with spring washers?
Accurate Fastners manufactures and supplies a wide range of fasteners including nuts, bolts, screws, flat washers, thread bars, anchors and pipe clamps. Ordering complementary components from a single supplier may simplify procurement and ensure dimensional compatibility.
How can I request a quotation for DIN 127 Spring Washers?
You may submit an enquiry through the website enquiry form, send your requirements by email to export@accuratefastners.com, or contact the team via WhatsApp. Please include nominal size, type, estimated quantity and any grade or documentation requirements for an accurate quotation.
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