Standard Flat Washers

 

 

Standard Flat Washers for Reliable Fastening Performance

 

Flat washers help distribute load, protect surfaces and improve the reliability of bolted connections.

 

AYA provides both standard flat washers and customized washer solutions with flexible materials, dimensions and surface treatments for industrial applications.
 

 

Product Name	Standard Flat Washers
Also Named	Steel Flat Washers
Material	Carbon Steel
Grade	Grade A/Grade C
Standard	DIN 1440
Alternative standard	GB /T 97.3, ISO 8738, DIN EN 28738
Diameter	M3/ M4/ M5/ M6/ M7/ M8/ M10/ M12/ M13/ M14/ M16/ M18/ M20/ M22/ M23/ M24/ M25/ M27/ M28/ M30/ M32/ M33/ M35/ M36/ M40/ M45/ M50/ M55/ M60/ M65/ M70/ M75/ M80/ M85/ M90/ M95/ M100
Finish	Plain, Black, Zinc Plated, Hot Dipped Galvanized, Oxidation, Dacromet, Phosphating, Cadmium Electroplate, Nickel Plated

 

 

 

Nominal Diameter d		3	4	5	6	7	8	10	12	13	14
d	min=nominal size	3	4	5	6	7	8	10	12	13	14
	max	3.06	4.075	5.075	6.075	7.09	8.09	10.09	12.11	13.11	14.11
dc		6	8	10	12	14	16	20	25	25	28
h		0.8	0.8	0.8	1.6	1.6	2	2.5	3	3	3
Nominal Diameter d		16	18	20	22	23	24	25	26	27	28
d	min=nominal size	16	18	20	22	23	24	25	26	27	28
	max	16.11	18.11	20.13	22.13	23.13	24.13	25.13	26.13	27.13	28.13
dc		28	30	32	34	36	38	40	40	40	42
h		3	4	4	4	4	4	4	5	5	5
Nominal Diameter d		30	32	33	35	36	40	45	50	55	60
d	min=nominal size	30	32	33	35	36	40	45	50	55	60
	max	30.13	32.16	33.16	35.16	36.16	40.16	45.16	50.16	55.19	60.19
dc		45	50	50	52	52	58	62	68	75	80
h		5	5	5	6	6	6	7	8	9	9
Nominal Diameter d		65	70	75	80	85	90	95	100	-	-
d	min=nominal size	65	70	75	80	85	90	95	100	-	-
	max	65.19	70.19	75.19	80.19	85.22	90.22	95.22	100.22	-	-
dc		90	95	100	110	110	115	120	125	-	-
h		9	10	10	12	12	12	12	14	-	-

 

 

 

1. Standard Flat Washers – Engineered for Precision and Load Control

Standard flat washers are essential components designed to distribute load, reduce surface stress, and protect assembly surfaces in bolted connections across industrial and automotive applications.

 

2. Wide Range of Sizes and Materials for Diverse Applications

We offer standard flat washers in a broad range of inner diameters (ID) and outer diameters (OD), compatible with metric and imperial bolt systems. Available materials include:

• Carbon steel (low/medium/high strength)
• Stainless steel (SS304, SS316)
• Alloy steel and specialty metals (upon request)

 

3. Engineered Load Distribution and Joint Integrity

Standard flat washers help ensure:

• Even load support across fastened joints
• Reduced bolt head/nut embedment
• Improved joint stability under vibration and thermal cycles

This makes them ideal for machinery, structural assemblies, automotive systems, and general manufacturing.

 

4. Stability in Vibration Environments

In vibration and dynamic load conditions, fastened joints are prone to preload loss and surface damage.

Standard flat washers increase the contact area and distribute loads more evenly, helping maintain stable clamping force and reduce loosening over time. This improves joint reliability in automotive, industrial, and structural applications exposed to continuous vibration.

 

 

While standard flat washers are suitable for general fastening applications, many projects require customized solutions to accommodate special loads, materials or installation conditions.

 

AYA manufactures custom flat washers for:

 

• Non-standard outer diameters
• Special inner hole sizes
• Custom thicknesses
• High-strength applications
• Corrosion-resistant environments
• Drawing or sample requirements

 

From prototype development to mass production, we provide reliable fastening solutions for demanding applications.

 

 

 

 

 

 

 

 

AYA combines precision manufacturing, strict material control, and flexible production capacity to deliver standard flat washers with consistent quality and reliable performance.

 

From dimensional accuracy and surface finishing to bulk supply and custom requirements, each washer is produced to meet industrial and automotive standards with stable lead times and dependable support.

 

 

 

 

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