DIN25201 Self-Locking Washer M8 M10 65mn Steel Dacromet Coating for Heavy Duty

• Customization: Available
• Type: Lock Washer
• Material: Carbon Steel
• Model NO.: DIN25201
• Combination Washer Structure: A Type
• Combination Washer Packaging: All Inclusive
• Spring Washer Type: Standard
• OEM: Available
• Application: Used in Between The Nut and Bolt.
• Temperature Range: -196°c ~ +800°c
• Structural Features: Sealing Performance
• Surface Treatment: Dacromet Coating ,Black Oxide Finish,Color Zinc
• Transport Package: Carton+Pallet
• Specification: M3-M80 ss & sp
• Trademark: RUIQIN
• Origin: China
• HS Code: 7318150000
• Production Capacity: 60000000piece/Years
• Package Size: 20.00cm * 10.00cm * 10.00cm
• Package Gross Weight: 5.000kg

Product Description

Product Description

DIN25201 is a flange standard established by the German Institute for Standardization (DIN), suitable for connecting pipelines, valves, and pressure vessels. These flanges are made of high-strength materials and feature various sealing face types, including flat face (FF), raised face (RF), and male-female face (MFM), ensuring excellent sealing performance and structural stability.

Supplied glued together in pairs.
 

These lock washers ensure that bolts and screws subjected to transverse loads, chattering or vibrations do not work loose. A joint is also secure at low levels of tension. If the bolt (nut) tends to loosen independently in bolted joints under dynamic stress, the bolt (nut) carries its positive-locking washer with it, the sloped surfaces of which run directly up against the angled surfaces of the counter-washer. In other words, the more a bolted joint tries to loosen itself, the more securely the wedge action of the washer blocks the attempt.

Product Advantages

• Anti-Loosening Design: Maintains clamping force under strong vibration, preventing bolt rotation for enhanced reliability.
• Friction-Based Locking: Self-locking without special tools, unaffected by lubrication or humidity.
• Easy Installation & Reusability: Standard tool compatibility and reusable design reduce downtime and costs.
• High Durability: Corrosion-resistant materials ensure long-term performance even in harsh conditions.

Application Scenarios
• Heavy Industry: Construction machinery, mining equipment.
• Infrastructure: Seismic-resistant structures like bridges and railways.
• Energy: Wind turbines, nuclear power plants.

Key Value ----"Secure Once, Reliable Forever" - Balancing safety and cost-efficiency.
 

Common Materials Selection Guide

Material	Description & Applications
65Mn Steel	High carbon steel with excellent hardness and wear resistance. Commonly used for springs, tools, and automotive parts requiring high strength and durability.
316 Stainless Steel	Austenitic stainless steel known for its exceptional corrosion resistance, especially in marine and chemical environments. Ideal for food processing, pharmaceuticals, and marine applications.
304 Stainless Steel	The most widely used stainless steel with good corrosion resistance, formability, and weldability. Commonly used in kitchen equipment, architectural applications, and chemical industries.
Carbon Steel (Q235)	Low-carbon steel with good weldability and strength. Widely used in construction, automotive, and manufacturing industries for structural components.

Surface Treatment Selection Guide

Surface Treatment	Description & Applications
Dacromet	A chrome-free zinc coating offering excellent corrosion resistance. Suitable for automotive and industrial equipment exposed to harsh environments.
Galvanizing (Zinc Plating)	Zinc coating applied through electroplating or hot-dip, providing strong corrosion protection. Common in construction, outdoor machinery, and pipelines.
Black Oxide (Blackening)	A chemical oxidation process that creates a black, protective layer on steel. Ideal for mechanical parts, automotive components, and tools where appearance and corrosion resistance are important.
Zinc-Chromate Coating	A zinc coating with added chromium for enhanced corrosion resistance. Used in aerospace and high-performance applications.
Nickel Plating	A nickel coating providing high hardness and excellent corrosion resistance, with a smooth surface. Used in electronics, precision parts, and industrial applications requiring high gloss and protection.
Phosphating	A process that forms a phosphate layer on the metal surface, improving adhesion and corrosion resistance. Used in automotive and machinery applications requiring good paint adhesion.

Detailed Photos

 

Installation Instructions

Mounting Examples for DIN 25201 Wedge Lock Washers

Tapped Holes

Wedge lock washers secure the screw against the seating face.

Counterbores

The OD of the standard wedge lock washers has been developed to suit DIN 974. The washers fit under the head of standard screws.

Through Holes

Two pairs of wedge lock washers are needed for drilled through holes - one pair secures the screw head and the other pair secures the nut. To prevent additional settling, the nuts and bolts should be mounted so that the wedge faces of the lock washer pairs interlock completely.

Studs

The nut is secured without the need to glue the stud.

Applications with Elongated Holes/Soft Surfaces

To optimize the surface pressure on elongated holes or soft materials (e.g., aluminum), the use of retaining washers with a larger seating face in combination with a flange nut/screw is recommended.

Soft Surfaces

Applications Where the Wedge Lock Washer Principle Does Not Work

• Non-fixed surfaces (see image on left)

• Surface hardness greater than washer hardness

• Very soft surfaces such as wood or plastic

• Applications with extremely high setting behavior

 

Product Parameters

Size

3

3.5

3.5 Large ^2

4

4 Large ^2

5

5 Large ^2

6

6 Large ^2

1/4 ^1

1/4 Large ^1 ^2

8

8 Large ^2

3/8 ^1

Bolt size		Metric
		Inch
d		max
		min
dc		Nominal Size
		max
		min
h		Steel	Nominal Size
			max
			min
per 1000 units≈kg ^3		Steel	≈
h		Stainless Steel	Nominal Size
			max
			min
per 1000 units≈kg ^3		Stainless Steel	≈

M3	M3.5	M3.5	M4	M4	M5	M5	M6	M6	-	-	M8	M8	-
#5	#6	#6	#8	#8	#10	#10	-	-	1/4"	1/4"	5/16"	5/16"	3/8"
3.50	4.00	4.00	4.50	4.50	5.50	5.50	6.60	6.60	7.30	7.30	8.80	8.80	10.50
3.30	3.80	3.80	4.30	4.30	5.30	5.30	6.40	6.40	7.10	7.10	8.60	8.60	10.10
7.0	7.6	9.0	7.6	9.0	9.0	10.8	10.8	13.5	11.5	13.5	13.5	16.6	16.6
7.20	7.80	9.20	7.80	9.20	9.20	11.00	11.00	13.70	11.70	13.70	13.70	16.80	16.80
6.80	7.40	8.80	7.40	8.80	8.80	10.60	10.60	13.30	11.30	13.30	13.30	16.40	16.40
1.8	1.8	1.8	1.8	1.8	1.8	1.8	1.8	2.5	2.5	2.5	2.5	2.5	2.5
2.05	2.05	2.05	2.05	2.05	2.05	2.05	2.05	2.75	2.75	2.75	2.75	2.75	2.75
1.55	1.55	1.55	1.55	1.55	1.55	1.55	1.55	2.25	2.25	2.25	2.25	2.25	2.25
0.30	0.40	0.60	0.40	0.60	0.50	1.10	0.70	2.00	0.80	1.80	1.50	2.80	2.30
2.20	2.20	2.20	2.20	2.20	2.20	2.20	2.20	2.00	2.20	2.20	2.00	2.00	2.00
2.45	2.45	2.45	2.45	2.45	2.45	2.45	2.45	2.25	2.45	2.45	2.25	2.25	2.25
1.95	1.95	1.95	1.95	1.95	1.95	1.95	1.95	1.75	1.95	1.95	1.75	1.75	1.75
0.40	0.40	0.70	0.40	0.70	0.60	1.10	0.90	1.60	0.90	1.50	1.20	2.30	1.90

Size

3/8 Large ^1 ^2

10

10 Large ^2

11

12

12 Large ^2

1/2 ^1

1/2 Large ^1 ^2

14

14 Large ^2

16

16 Large ^2

18

18 Large ^2

Bolt size		Metric
		Inch
d		max
		min
dc		Nominal Size
		max
		min
h		Steel	Nominal Size
			max
			min
per 1000 units≈kg ^3		Steel	≈
h		Stainless Steel	Nominal Size
			max
			min
per 1000 units≈kg ^3		Stainless Steel	≈

-	M10	M10	M11	M12	M12	-	-	M14	M14	M16	M16	M18	M18
3/8"	-	-	7/16"	-	-	1/2"	1/2"	9/16"	9/16"	5/8"	5/8"	-	-
10.50	10.90	10.90	11.60	13.20	13.20	13.70	13.70	15.40	15.40	17.20	17.20	19.70	19.70
10.10	10.50	10.50	11.20	12.80	12.80	13.30	13.30	15.00	15.00	16.80	16.80	19.30	19.30
21.0	16.6	21.0	18.5	19.5	25.4	19.5	25.4	23.0	30.7	25.4	30.7	29.0	34.5
21.20	16.80	21.20	18.70	19.70	25.60	19.70	25.60	23.20	30.90	25.60	30.90	29.20	34.70
20.80	16.40	20.80	18.30	19.30	25.20	19.30	25.20	22.80	30.50	25.20	30.50	28.80	34.30
2.5	2.5	2.5	2.5	2.5	3.4	2.5	3.4	3.4	3.4	3.4	3.4	3.4	3.4
2.75	2.75	2.75	2.75	2.75	3.65	2.75	3.65	3.65	3.65	3.65	3.65	3.65	3.65
2.25	2.25	2.25	2.25	2.25	3.15	2.25	3.15	3.15	3.15	3.15	3.15	3.15	3.15
4.80	2.20	4.70	2.90	2.90	9.30	2.70	9.00	5.60	14.10	6.70	12.80	8.90	15.80
2.00	2.00	2.00	2.20	2.00	3.00	2.00	3.20	3.00	3.20	3.00	3.20	3.20	3.20
2.25	2.25	2.25	2.45	2.25	3.25	2.25	3.45	3.25	3.45	3.25	3.45	3.45	3.45
1.75	1.75	1.75	1.95	1.75	2.75	1.75	2.95	2.75	2.95	2.75	2.95	2.95	2.95
3.80	1.80	3.70	2.60	2.30	8.20	2.20	8.00	4.90	13.10	5.90	11.30	8.00	15.60

Size

3/4 ^1

3/4 Large ^1 ^2

20

20 Large ^2

22

22 Large ^2

24

24 Large ^2

1 ^1

1 Large ^1 ^2

27

27 Large ^2

30

30 Large ^2

Bolt size		Metric
		Inch
d		max
		min
dc		Nominal Size
		max
		min
h		Steel	Nominal Size
			max
			min
per 1000 units≈kg ^3		Steel	≈
h		Stainless Steel	Nominal Size
			max
			min
per 1000 units≈kg ^3		Stainless Steel	≈

-	-	M20	M20	M22	M22	M24	M24	-	-	M27	M27	M30	M30
3/4"	3/4"	-	-	7/8"	7/8"	-	-	1"	1"	-	-	1 1/8"	1 1/8"
20.20	20.20	21.60	21.60	23.60	23.60	25.50	25.50	28.10	28.10	28.60	28.60	31.60	31.60
19.80	19.80	21.20	21.20	23.20	23.20	25.10	25.10	27.70	27.70	28.20	28.20	31.20	31.20
30.7	39.0	30.7	39.0	34.5	42.0	39.0	48.5	39.0	48.5	42.0	48.5	47.0	58.5
30.90	39.20	30.90	39.20	34.70	42.20	39.20	48.70	39.30	48.80	42.30	48.80	47.30	58.80
30.50	38.80	30.50	38.80	34.30	41.80	38.80	48.30	38.70	48.20	41.70	48.20	46.70	58.20
3.4	3.4	3.4	3.4	3.4	4.6	3.4	4.6	3.4	4.6	5.8	5.8	5.8	6.6
3.65	3.65	3.65	3.65	3.65	4.85	3.65	4.85	3.65	4.85	6.05	6.05	6.05	6.60
3.15	3.15	3.15	3.15	3.15	4.35	3.15	4.35	3.15	4.35	5.55	5.55	5.55	6.10
10.50	22.10	9.30	20.90	12.50	31.90	17.40	45.10	15.30	42.00	31.40	52.70	41.00	85.80
3.20	3.20	3.00	3.20	3.20	3.20	3.20	3.20	3.20	3.20	6.80	6.80	6.80	6.80
3.45	3.45	3.25	3.45	3.45	3.45	3.45	3.45	3.20	3.20	6.80	6.80	6.80	6.80
2.95	2.95	2.75	2.95	2.95	2.95	2.95	2.95	2.70	2.70	6.30	6.30	6.30	6.30
9.60	21.00	8.20	20.60	12.30	22.20	15.90	35.00	14.20	27.90	34.50	53.40	44.90	91.80

Size

33

33 Large ^2

36

36 Large ^2

39

42

45

48

52

56

60

64

68

72

Bolt size		Metric
		Inch
d		max
		min
dc		Nominal Size
		max
		min
h		Steel	Nominal Size
			max
			min
per 1000 units≈kg ^3		Steel	≈
h		Stainless Steel	Nominal Size
			max
			min
per 1000 units≈kg ^3		Stainless Steel	≈

M33	M33	M36	M36	M39	M42	M45	M48	M52	M56	M60	M64	M68	M72
1 1/4"	1 1/4"	1 3/8"	1 3/8"	1 1/2"	-	1 3/4"	-	2"	2 1/4"	-	2 1/2"	-	-
34.60	34.60	37.60	37.60	40.60	43.40	46.70	50.10	54.10	59.60	63.60	67.60	71.60	75.60
34.20	34.20	37.20	37.20	40.20	43.00	46.20	49.60	53.60	59.10	63.10	67.10	71.10	75.10
48.5	58.5	55.0	63.0	58.5	63.0	70.0	75.0	80.0	85.0	90.0	95.0	100.0	105.0
48.80	58.80	55.30	63.30	58.80	63.30	70.00	75.00	80.00	85.00	90.00	95.00	100.00	105.00
48.20	58.20	54.70	62.70	58.20	62.70	68.00	73.00	78.00	83.00	88.00	93.00	98.00	103.00
5.8	6.6	5.8	6.6	5.8	5.8	7.0	7.0	7.0	7.0	7.0	7.0	9.5	9.5
6.05	6.60	6.05	6.60	6.05	6.05	7.75	7.75	7.75	7.75	7.75	7.75	10.25	10.25
5.55	6.10	5.55	6.10	5.55	5.55	6.25	6.25	6.25	6.25	6.25	6.25	8.75	8.75
38.90	80.00	54.90	91.50	58.90	79.70	102.00	120.00	130.00	135.00	152.00	167.00	282.00	307.00
6.80	/	6.80	/	6.80	6.80	6.80	6.80	9.00	9.00	9.00	9.00	9.00	9.00
6.80	/	6.80	/	6.80	6.80	7.55	7.55	9.75	9.75	9.75	9.75	9.75	9.75
6.30	/	6.30	/	6.30	6.30	6.05	6.05	8.25	8.25	8.25	8.25	8.25	8.25
42.80	/	59.60	/	67.40	75.00	102.00	120.00	180.40	213.00	235.00	258.00	282.00	307.00

Size

76

80

85

90

95

100

105

110

115

120

125

130

Bolt size		Metric
		Inch
d		max
		min
dc		Nominal Size
		max
		min
h		Steel	Nominal Size
			max
			min
per 1000 units≈kg ^3		Steel	≈
h		Stainless Steel	Nominal Size
			max
			min
per 1000 units≈kg ^3		Stainless Steel	≈

M76	M80	M85	M90	M95	M100	M105	M110	M115	M120	M125	M130
3"	3 1/8"	-	-	-	4"	-	-	-	-	-	5"
79.60	83.60	88.60	92.90	97.90	103.90	108.90	113.90	118.90	123.90	128.90	133.90
79.10	83.10	88.10	92.40	97.40	103.40	108.40	113.40	118.40	123.40	128.40	133.40
110.0	115.0	120.0	130.0	135.0	145.0	150.0	155.0	165.0	170.0	173.0	178.0
110.00	115.00	120.00	130.00	135.00	145.00	150.00	155.00	165.00	170.00	173.00	178.00
108.00	113.00	118.00	128.00	133.00	143.00	148.00	153.00	163.00	168.00	171.00	176.00
9.5	9.5	9.5	9.5	9.5	9.5	9.5	9.5	9.5	9.5	9.5	9.5
10.25	10.25	10.25	10.25	10.25	10.25	10.25	10.25	10.25	10.25	10.25	10.25
8.75	8.75	8.75	8.75	8.75	8.75	8.75	8.75	8.75	8.75	8.75	8.75
333.00	360.00	378.00	477.00	498.00	589.00	613.00	635.00	753.00	779.00	766.00	792.00
9.00	9.00	/	/	/	/	/	/	/	/	/	/
9.75	9.75	/	/	/	/	/	/	/	/	/	/
8.25	8.25	/	/	/	/	/	/	/	/	/	/
333.00	360.00	/	/	/	/	/	/	/	/	/	/

1,The specification is in inches.
2,Large Type
3,"Thousands of pieces" can be understood as "the weight of each thousand sets of washers"

Packaging & Shipping

Inner Pack: Fixed quantity per bag (typically 1000 pcs, model-dependent), sealed in heavy-duty polyethylene bags for moisture/dust protection.

Outer Pack: Bags packed in 3-ply corrugated cartons with product labels and shock warnings.
Reinforcement: Cartons secured with nylon strapping to prevent breakage.

 

Bulk Shipment:
Palletization: Cartons stacked on wooden pallets , wrapped with PE stretch film, corner guards and load stabilizers applied.

Logistics: Secured in containers or air-ride trucks for long-distance sea/land freight.

 

Custom Options:

Customizable: Adjust bag quantities, carton sizes/printing, pallet materials upon request.

Key Benefits

√ Low Damage Rate: Multi-layer protection minimizes transit risks.
√ Efficient Handling: Uniform packaging for automated logistics.

Company Profile

With over 20 years of specialization in washer manufacturing, we operate a 1,800+ sqm modern production facility equipped with 30+ fully automated machines (including precision stamping presses and automated production lines), delivering an annual output exceeding 200 million pieces. Our 40+ professional production team guarantees rapid prototyping and mass order fulfillment. Products are widely used in hardware, machinery, construction and other industries. We serve hundreds of domestic clients while maintaining stable supply to global markets. Ample stock available, supporting customized materials/sizes.
 

 

Our Advantages

Category	Advantages

Production Capabilities

- 20+ Years Expertise: Specialized in precision washer production since 2005 - Scalable Capacity: 1,800+ sqm facility with 30+ automated production  - Annual Output: 200 million+ pieces (consistent quality control) - Rapid Prototyping: 24-hour sample service with 3-day mass production turnaround - Flexible MOQ: Support trial orders from 500pcs to million-piece bulk orders

Quality Assurance

- Precision Tolerance: ±0.1mm accuracy maintained through CNC control - 3-Stage Inspection: Full-process QC from raw materials → production → shipment - Traceability System: Batch number tracking for all products

Customization Services

- Material Options: Stainless steel (304/316), carbon steel, brass, copper, etc. - Surface Treatments: Zinc plating, nickel plating, passivation, Dacromet, etc. - Technical Support: Dedicated engineers for product selection solutions - CAD Compatibility: Direct tooling from customer CAD files

Supply Chain Strengths

- Direct Material Procurement: Partnership with tier-1 steel mills - Safety Stock: Maintain 300+ metric tons of ready-to-ship inventory - Dual-Shift Production: 40+ skilled workers ensuring stable capacity - Price Stability: Seasonal procurement plans to buffer material fluctuations

Logistics Services

- Global Shipping: Established partnerships with DHL, FedEx, and ocean freight forwarders - Express Delivery: 48-hour dispatch for standard products - Production Transparency: Available real-time workshop video updates - Bilingual Support: Technical documentation in English/Chinese

Cost Advantages

- 15-20% Cost Savings: Achieved through vertical integration & automation - Mold Efficiency: 30% faster die changeover than industry average - Material Utilization: 99% efficiency through optimized nesting

 

FAQ

Category	FAQ
Production & Ordering
1. Minimum Order Quantity (MOQ)	- Standard washers: 500 pcs - Custom designs: 5,000 pcs (depends on complexity)
2. Sample Policy	- Standard items: Free samples (customer pays shipping) - Custom items: Sample fee (deductible from bulk orders)
3. Sample Lead Time	- Existing tooling: 24 hours + shipping - New tooling: 3-5 business days
4. Tooling Costs	- Simple dies: $110-275/set - Complex tooling: Quoted based on CAD design
Technical Specifications
5. Dimensional Tolerance	- Standard: ±0.1mm - Precision: ±0.05mm (+20% surcharge)
6. Material Options
7. Surface Finishes	- Plating: Zinc/Nickel (48-96 hours salt spray resistance) - Specialty: Dacromet (1000+ hours corrosion resistance)
Quality Assurance
8. Production Monitoring	- Real-time workshop video access - Daily progress reports
9. Quality Issue Resolution	- 48-hour response guarantee - Priority replacement shipping
10. Audit Compliance	- Accepts SGS audits - Requires 2-week advance notice
Commercial Terms
11. Payment Terms	- New clients: 30% deposit, 70% before shipment - Approved accounts: O/A 30 days
12. Production Capacity	- Base capacity: 15M pcs/month - Maximum capacity: 20M pcs/month (with advance notice)
13. Toll Processing	- Accepted (material certificates required) - 3% material overage required
Logistics & Support
14. Expedited Orders	- 48-hour rush service (+15% fee) - Priority stock allocation
15. Export Documentation	- Commercial Invoice - Packing List - Certificate of Origin
16. Quality Certificates	- Dimensional inspection report - Salt spray test results - Material composition analysis
Value-Added Services
17. Packaging Options	- Carton packaging - Pallet packaging - Bulk packaging
18. Damage Claims	Required documents: 1. Damage photos at destination 2. Carrier inspection report (Processed within 72 hours)
19. Insurance Coverage	- $700,000 product liability per incident - Global coverage