DIN 137-B
Spring Wave Washers
Form B · Manufacturer Mumbai
What Is a DIN 137-B Spring Wave Washers
A conventional split spring (lock) washer resists loosening by digging its cut, angled edges into the bearing surfaces on either side — effective, but concentrated at just two contact points, which can mark softer materials and doesn’t provide a genuinely predictable spring rate. DIN 137 takes a different approach entirely: it’s a flat spring washer, not a locking device, designed to compensate for axial movement and apply a controlled, distributed clamping force rather than bite into anything.
Form B is the multi-wave version — stamped with several gentle undulations around the washer’s circumference, as opposed to Form A’s single curved profile. More waves mean a softer, more linear spring characteristic across its compression range, giving more predictable control over the actual preload force applied. That makes Form B particularly well suited to bearing preloading, taking up small axial clearances from thermal expansion or wear, and applications where a soft, even spring force matters more than raw locking bite.
Akbar Fasteners Pvt. Ltd. manufactures DIN 137-B wave washers in-house at our Mumbai facility, under ISO 9001:2015, with full mill test documentation, and exports this range to over 50 countries.
Where DIN 137-B Washers Genuinely Earn Their Place
Softer, More Linear Spring Rate
Multiple waves distribute the spring action across the whole circumference, giving more predictable, controllable preload than a single-curve washer.
No Surface Marking
Applies distributed contact pressure rather than the sharp digging edges of a split lock washer, protecting softer or finished bearing faces.
Full Dimension Reference
A published size and thickness chart lets you select the correct wave washer for your bore, thread, and deflection requirement.
Wide Material & Finish Choice
Spring steel and stainless steel available across the full size range, in bulk quantities for OEM bearing and assembly needs.
DIN 137-B Wave Washer Dimension Chart
Standard nominal dimensions by thread size — inner diameter (d1), outer diameter (d2), and free-state thickness are the figures to check first against your bore and clearance requirement. Wave count typically increases with washer diameter to maintain a proportional spring characteristic across the size range.
| Thread Size (d) | Inner Dia. (d1) | Outer Dia. (d2) | Free Thickness | Typical Wave Count |
|---|---|---|---|---|
| M3 | 3.2 mm | 7.0 mm | 0.3 mm | 3 |
| M4 | 4.3 mm | 8.7 mm | 0.4 mm | 3 |
| M5 | 5.3 mm | 10.2 mm | 0.4 mm | 3 |
| M6 | 6.4 mm | 12.2 mm | 0.5 mm | 3 |
| M8 | 8.4 mm | 15.8 mm | 0.6 mm | 4 |
| M10 | 10.5 mm | 19.0 mm | 0.6 mm | 4 |
| M12 | 13.0 mm | 23.0 mm | 0.7 mm | 4 |
| M16 | 17.0 mm | 29.0 mm | 0.8 mm | 5 |
| M20 | 21.0 mm | 36.0 mm | 1.0 mm | 5 |
| M24 | 25.0 mm | 42.0 mm | 1.2 mm | 6 |
Figures shown are representative reference values for quick planning purposes; actual wave count and spring deflection characteristics can vary by manufacturer. Please confirm exact dimensions against the current DIN 137 standard document or your engineering drawing, and request our certified dimensional data sheet, before finalizing a purchase order.
Spring Washer Product Range
Wave Washers (Form B)
Multi-wave axial spring washers in spring steel and stainless, M3 to M48 thread reference.
DIN 137-ACurved Washers (Form A)
Single-curve spring washers for lighter axial compensation applications.
DIN 128Spring Lock Washers
Split-ring spring washers providing friction-based resistance to nut loosening.
DIN 2093Belleville Disc Springs
Cone-shaped disc springs for higher load, stacked-configuration spring applications.
DIN 137-B Technical Overview
Available Materials
- Spring Steel Standard Offering
- Stainless Steel A2 / A4 on Request
- Phosphor Bronze Non-Magnetic Applications
- Surface Finish Zinc Plated / Bright
- Custom Material To Specification
Design Details
- Form B (Multi-Wave)
- Function Axial Compensation, Not Locking
- Deflection Range Grade-Dependent
- Hardness Standard Spring Temper
- Testing MTC / NABL on Request
Available Dimensions
- Thread Reference M3 – M48
- Custom Bore Sizes To Drawing on Request
- Wave Count 3 – 6, Size Dependent
- Standard Reference DIN 137-B
- Packaging Loose / Boxed / Bulk
Application Areas
Wherever axial movement, clearance, or expansion needs a soft, distributed spring take-up.
Bearing Preload
preload in bearing housings
Electric Motor Assembly
compensation in motors
Automotive Components
drivetrain compensation
Pumps & Rotating Equipment
take-up in rotating assemblies
Electronics & Connectors
pressure in connector housings
Precision Instrumentation
for sensitive assemblies
Valve & Actuator Assembly
thermal expansion in valves
General Machine Assembly
controlled axial spring force
Standard Export Documentation
Prepared as standard practice for every wave washer shipment.
Mill Test Certificate (MTC)
Material composition and hardness verification for every production batch.
Certificate of Conformance
Confirms the shipment matches the purchase order specification, size, and grade in full.
Certificate of Origin (COO)
Confirms India as country of manufacture for destination customs purposes.
Commercial Invoice & Packing List
Itemized value, Incoterm, and detailed carton/weight breakdown for customs clearance.
Dimensional Data Sheet
Certified inner/outer diameter and thickness data against DIN 137-B available on request before order confirmation.
Bill of Lading
Ocean or air freight shipping document confirming carrier, mode, and consignee details.
Internationally Recognised Standards Coverage
Related Fastener Grades & Standards
DIN 137-A Curved Washers
A stiffer, more direct spring response for lighter axial compensation needs.
View DIN 137-A →DIN 93 Tab Washers
Bendable locking washers offering a physical, verifiable safety locking philosophy.
View DIN 93 →DIN 99 Clamping Levers
Hand-adjustable clamping levers for repeated fixturing and adjustment applications.
View DIN 99 →DIN 94 Split Pins
Bend-apart retention pins for castellated nut and clevis pin locking applications.
View DIN 94 →Top Nickel Fasteners Manufacturer
See our full in-house nickel alloy manufacturing and documentation capability.
View Manufacturer Page →Send Us Your
Bore Size & Deflection Requirement
Tell us your bore size, target deflection, and material preference — we’ll confirm the correct DIN 137-B specification and issue a certified dimensional data sheet with your quote. Akbar Fasteners Pvt. Ltd. responds within 24 hours.
Sales: +91 724 0000 733 · Support: +91 800 9315 333 · sales@akbarfasteners.in