DIN 6796 Conical Spring Washer – Spring Steel, Phosphate Black

FULLERKREG DIN 6796 Conical Spring Washers (also known as Belleville washers or disc spring washers) are engineered for bolt/nut assemblies requiring sustained clamping force under dynamic loads, vibration, and thermal cycling. Manufactured to DIN 6796 (October 1987) and ISO 7090 standards, these washers deliver superior axial spring force compared to conventional flat or split lock washers.

Product Specifications

Thread D	D1 min (mm)	D2 max (mm)	H nom (mm)	h nom (mm)	S nom (mm)
M2	2.20	5	0.50	0.60	0.40
M2.5	2.70	6	0.61	0.72	0.50
M3	3.20	7	0.72	0.85	0.60
M3.5	3.70	8	0.84	1.00	0.60
M4	4.30	9	1.11	1.30	0.80
M5	5.30	11	1.30	1.55	1.20
M6	6.40	14	1.70	2.00	1.60
M7	7.40	17	2.00	2.35	1.70
M8	8.40	18	1.40	2.80	2.00
M10	10.50	23	2.50	3.20	2.50
M12	13.00	28	3.00	3.80	2.50
M14	15.00	33	4.04	4.85	3.50
M16	17.00	38	3.50	5.00	4.00
M18	19.00	42	3.06	5.60	4.50
M20	21.00	45	5.00	6.40	4.50
M22	23.00	49	5.55	7.00	6.50
M24	25.00	56	6.77	7.75	6.00
M27	28.00	60	7.50	9.35	6.50
M30	31.00	70	8.00	9.30	7.00

* D1 = Inner diameter (min) · D2 = Outer diameter (max) · H = Overall height (loaded flat) · h = Free height · S = Thickness
All dimensions in mm per DIN 6796 / ISO 7090.

Material & Surface

Property	Details
Material	Spring Steel (51CrV4 / 50CrV4, per DIN 267 Part 26 / DIN 17 221)
Surface Treatment	Phosphate Black (磷化黑)
Hardness	42–52 HRC (per DIN 267 Part 26)
Tensile Strength	1,250–1,550 N/mm²
Standard	DIN 6796 : 1987 / ISO 7090
Size Range	M2 – M30

Key Features & Application

• 🔩 High Axial Clamping Force — Generates 1.5–4× the clamping load of standard flat washers; maintains preload under vibration and thermal expansion/contraction cycles.
• 🔄 Reusable & Resilient — Spring steel construction allows repeated assembly/disassembly without loss of spring characteristics, provided washer is not flattened beyond design limit.
• ⚙️ Stacking Flexibility — Stack in the same direction to multiply load capacity; stack in opposing directions to increase deflection range and shock absorption.
• 🛡️ Vibration Resistance — Ideal for engines, turbines, generators, heavy machinery, and structural bolt assemblies subject to dynamic loading.
• 🏭 Phosphate Black Finish — Provides mild corrosion protection and excellent paint adhesion; suitable for indoor and controlled-environment applications.
• 📐 DIN 6796 Compliant — Designed specifically for bolt/nut assemblies per DIN 6796 (October 1987); not interchangeable with DIN 2093 disc springs.

Stacking Guide

Stack Configuration	Effect	Typical Use
Single washer	Standard clamping force	General bolt assemblies
Same direction (series)	Increased deflection, same load	High-vibration, shock absorption
Opposing direction (parallel)	Doubled load capacity, same deflection	Heavy-duty clamping, high preload
Mixed stacking	Customized load/deflection curve	Precision engineering assemblies

Selection Guide

Application Requirement	Recommended Specification
General indoor machinery	M4–M16, single or parallel stack
High-vibration engines / turbines	M8–M24, series stack
Structural steel connections	M16–M30, parallel stack
Light assemblies / electronics	M2–M5, single washer
Thermal cycling environments	M6–M20, spring steel grade

Standards Reference

• DIN 6796 : 1987 — Conical spring washers for bolt/nut assemblies (supersedes July 1977 edition)
• DIN 267 Part 26 — Technical delivery conditions for spring steel fasteners
• DIN 17 221 — Hot-rolled steels for quenched and tempered springs
• DIN 1544 — Sheet tolerances for cold-rolled strip
• ISO 7090 — Plain washers, chamfered — Normal series
• DIN 4000 Part 3 — Tabular layout of article characteristics for washers
• DIN 8998 Part 1 — Mechanical properties of fasteners: nuts and studs

Note: DIN 6796 conical spring washers are designed for bolt/nut assemblies only. They are NOT disc springs per DIN 2093 and must not be used as such.

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Why FULLERKREG?

• 🏭 Direct Manufacturer — Factory-direct pricing with no middlemen; consistent quality from our own production lines.
• 📦 Wholesale & Bulk Ready — MOQ-flexible, bulk packaging available; supports OEM and MRO procurement programs.
• 📐 Engineering-Grade Compliance — Every batch traceable to DIN/ISO standards with material certifications available on request.
• 🌍 Global Shipping — Reliable international logistics to support your supply chain worldwide.
• ⚡ Fast Quote Response — Submit your BOM or RFQ and receive a competitive quote within 24 hours.
• ✅ Full Size Range In Stock — M2 through M30 available from inventory; custom sizes on request.