Stainless Steel DIN 125 Flat Washer

The Stainless Steel DIN 125 Flat Washer supplied by Wanluo Factory is a standard German-made universal flat gasket. It is also the most widely applicable basic accessory component in the industrial assembly system. Different from the functional designs of anti-loosening washers and special-shaped sealing gaskets, this product features a pure flat single-layer regular structure. Its core characteristics include high-precision inner and outer diameter tolerances and a smooth and flat surface. It is dedicated to solving basic assembly problems such as pressure distribution, workpiece protection, and fine adjustment of gaps during bolt assembly.

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Product Description

The stainless steel DIN 125 flat washers manufactured by Wanluo suppliers can effectively prevent common assembly defects such as board surface indentation, stress concentration, metal friction wear, and loose fastening caused by direct bolt compression. The product is produced in full accordance with German industrial standards, using precise stamping and rounded edge trimming techniques for shaping. The board surface is free of burrs, and the thickness is uniform and flat. Complementing with high-quality stainless steel and carbon steel substrates, it exhibits excellent pressure resistance, corrosion resistance, and toughness performance, and can be applied to most conventional fastening scenarios in mechanical equipment, electronic appliances, structural engineering, and daily industrial fields.

Product advantages

1. Uniform pressure distribution protection, preventing workpiece compression damage

The flat and integrated planar structure can significantly disperse the local pressure of bolt locking, avoiding single-point stress concentration. It can effectively protect thin plates, plastics, precision paint surfaces, and fragile substrates from collapse, indentation or deformation. It is particularly suitable for assembly operations of thin parts and precision appearance components.

2. High precision size tolerance, with extremely strong adaptability

The inner hole is precisely punched, and the inner and outer diameter dimensions are standard. It can be perfectly matched with various German standards, Chinese standards bolts, screws, and nuts. The assembly concentricity is high, and there will be no eccentricity, jamming, or excessive clearance problems. It is suitable for the majority of universal fastener systems worldwide.

3. Mirror surface smooth without burrs, not damaging the precision contact surface

After fine polishing and rounded edge blunting treatment, the upper and lower board surfaces are smooth and clean, without sharp edges, burrs, or oxidized black spots. During assembly, it will not scratch the workpiece surface, coating, and precise bonding surface, meeting the dust-free and seamless assembly requirements of high-end equipment and precision instruments.

4. Stable structure and pressure resistance, no deformation under long-term stress

It is formed by one-piece stamping of high-purity steel, with uniform thickness and dense material. The pressure-bearing capacity is stable. Under long-term static locking and slight dynamic loads, it is not prone to collapse, warping, or plastic deformation, and always maintains a flat and fitting state, ensuring the stability of fastening.

Product Parameter

Parameter Item	Detailed Specification
Product Name	DIN 125 Flat Washer, Stainless Steel Plain Flat Gasket
Executive Standard	DIN 125, ISO Standard, GB Standard, Custom Non-standard Dimensions
Available Material	304, 316L Stainless Steel, Carbon Steel Zinc-plated, Brass
Size Range	M1.6-M24 full standard matching sizes, custom thickness & outer diameter
Structure Type	Ultra-flat single-layer structure, round flat shape, smooth double sides
Processing Technology	Precision stamping, edge deburring, flat leveling, surface polishing
Matching Fastener	Universal fit for standard metric bolts, machine screws and nuts
Surface Treatment	Pickling & passivation / Zinc-plated / Polished, anti-rust & anti-corrosion
Mechanical Properties	Uniform thickness, high flatness, strong compression resistance, no deformation
Packaging Method	Moisture-proof inner bag + export carton, pallet packing for bulk orders
Supply Service	Spot bulk supply, non-standard customization, mixed fastener one-stop procurement

Stainless Steel Din 125 Flat Washer

Size		Φ1.7	Φ1.8	Φ2.2	Φ2.5	Φ2.7	Φ2.8	Φ3.2	Φ3.7	Φ4.3	Φ5.3	Φ6.4	Φ7.4	Φ8.4	Φ10.5	Φ13	Φ15
M	For thread size	M1.6	M1.7	M2	M2.3	M2.5	M2.6	M3	M3.5	M4	M5	M6	M7	M8	M10	M12	M14
d	min=nominal size	1.7	1.8	2.2	2.5	2.7	2.8	3.2	3.7	4.3	5.3	6.4	7.4	8.4	10.5	13	15
d	max	1.84	1.94	2.34	2.64	2.84	2.94	3.38	3.88	4.48	5.48	6.62	7.62	8.62	10.77	13.27	15.27
d_c	max=nominal size	4	4.5	5	6	6	7	7	8	9	10	12	14	16	20	24	28
d_c	min	3.70	4.20	4.70	5.70	5.70	6.64	6.64	7.64	8.64	9.64	11.57	13.57	15.57	19.48	23.48	27.48
h	Nominal Size	0.3	0.3	0.3	0.5	0.5	0.5	0.5	0.5	0.8	1	1.6	1.6	1.6	2	2.5	2.5
	max	0.35	0.35	0.35	0.55	0.55	0.55	0.55	0.55	0.9	1.1	1.8	1.8	1.8	2.2	2.7	2.7
	min	0.25	0.25	0.25	0.45	0.45	0.45	0.45	0.45	0.7	0.9	1.4	1.4	1.4	1.8	2.3	2.3
per 1000 units ≈ kg		0.024	0.031	0.037	0.092	0.088	0.127	0.119	0.155	0.308	0.443	1.02	1.39	1.83	3.57	6.27	8.62

Size		Φ17	Φ19	Φ21	Φ23	Φ25	Φ27	Φ28	Φ29	Φ31	Φ33	Φ34	Φ36	Φ37	Φ39	Φ40	Φ41
M	For thread size	M16	M18	M20	M22	M24	M26	M27	M28	M30	M32	M33	M35	M36	M38	M39	M40
d	min=nominal size	17	19	21	23	25	27	28	29	31	33	34	36	37	39	40	41
d	max	17.27	19.33	21.33	23.33	25.33	27.33	28.33	29.33	31.39	33.62	34.62	36.62	37.62	39.62	40.62	41.62
d_c	max=nominal size	30	34	37	39	44	50	50	50	56	60	60	66	66	72	72	72
d_c	min	29.48	33.38	36.38	38.38	43.38	49.38	49.38	49.38	55.26	58.80	58.80	64.80	64.80	70.80	70.80	70.80
h	Nominal Size	3	3	3	3	4	4	4	4	4	5	5	5	5	6	6	6
	max	3.3	3.3	3.3	3.3	4.3	4.3	4.3	4.3	4.3	5.6	5.6	5.6	5.6	6.6	6.6	6.6
	min	2.7	2.7	2.7	2.7	3.7	3.7	3.7	3.7	3.7	4.4	4.4	4.4	4.4	5.4	5.4	5.4
per 1000 units ≈ kg		11.3	14.7	17.2	18.3	32.3	43.7	42.3	40.9	53.6	77.4	75.3	94.3	92.1	136	133	130

Size		Φ43	Φ46	Φ50	Φ52	Φ54	Φ57	Φ58	Φ60	Φ62	Φ66	Φ70	Φ74	Φ78	Φ82	Φ87	Φ93
M	For thread size	M42	M45	M48	M50	M52	M55	M56	M58	M60	M64	M68	M72	M76	M80	M85	M90
d	min=nominal size	43	46	50	52	54	57	58	60	62	66	70	74	78	82	87	93
d	max	43.62	46.62	50.62	52.74	54.74	57.74	58.74	60.74	62.74	66.74	70.74	74.74	78.74	82.87	87.87	93.87
d_c	max=nominal size	78	85	92	92	98	105	105	110	110	115	120	125	135	140	145	160
d_c	min	76.80	83.60	90.60	90.60	96.60	103.60	103.60	108.60	108.60	113.60	118.60	123.40	133.40	138.40	143.40	158.40
h	Nominal Size	7	7	8	8	8	9	9	9	9	9	10	10	10	12	12	12
	max	8	8	9	9	9	10	10	10	10	10	11	11	11	13.2	13.2	13.2
	min	6	6	7	7	7	8	8	8	8	8	9	9	9	10.8	10.8	10.8
per 1000 units ≈ kg		183	220	294	284	330	431	425	472	458	492	586	626	749	953	996	1250

Size		Φ98	Φ104	Φ109	Φ114	Φ119	Φ124	Φ129	Φ134	Φ139	Φ144	Φ149	Φ155	Φ165
M	For thread size	M95	M100	M105	M110	M115	M120	M125	M130	M135	M140	M145	M150	M160
d	min=nominal size	98	104	109	114	119	124	129	134	139	144	149	155	165
d	max	98.87	104.87	109.87	114.87	119.87	125	130	135	140	145	150	156	166
d_c	max=nominal size	165	175	180	185	200	210	220	220	230	240	250	250	250
d_c	min	163.40	173.40	178.40	183.15	198.15*	208.15	218.15	218.15	228.15	238.15	248.15	248.15	248.15
h	Nominal Size	12	14	14	14	14	16	16	16	16	18	18	18	18
	max	13.2	15.2	15.2	15.2	15.2	17.2	17.2	17.2	17.2	19.2	19.2	19.2	19.2
	min	10.8	12.8	12.8	12.8	12.8	14.8	14.8	14.8	14.8	16.8	16.8	16.8	16.8
per 1000 units ≈ kg		1300	1710	1770	1830	2230	2830	3130	3000	3310	4090	4470	4270	3910

Functional Strengths & Multi-Field Industrial Utilization

1. High flatness integral flat structure disperses local fastening pressure evenly, effectively preventing thin metal plates, plastic parts and wooden workpieces from extrusion indentation, cracking and deformation during bolt locking.

2. Double-sided burr-free polishing process protects precision workpiece surfaces from scratch and abrasion, solving the problem of metal friction damage caused by direct contact between bolt head and workpiece.

3. Strict standard inner and outer diameter tolerance ensures precise matching with all metric standard fasteners, avoiding eccentric assembly and loose fitting, greatly improving assembly stability and fastening uniformity.

4. Excellent material toughness and compression resistance, no bending or permanent deformation under standard locking torque, maintaining long-term stable auxiliary fastening effect and improving assembly durability.

5. Multiple material and surface treatment options adapt to indoor assembly, outdoor humid environment and lightly corrosive working conditions, widely used in machinery, electronics, furniture, electrical appliances and construction engineering fields.

Stainless Steel Din 125 Flat Washer

Notes for Attention

1. Differentiate product function positioning: DIN 125 is a purely flat pressure gasket without elastic anti-loosening structure. It cannot be used as a substitute for spring washers or DIN 25201 anti-loosening washers. In high-frequency vibration and heavy-load impact conditions, it needs to be used in combination with special anti-loosening accessories.

2. Strictly match specification dimensions: The corresponding flat washer of the bolt outer diameter should be selected to ensure compatibility. If the inner hole is too large, it will cause eccentric force and unstable adhesion. If the inner hole is too small, it will result in assembly jamming and inability to press tightly, affecting the overall assembly accuracy.

3. Prohibit violent overpressure use: Although the pressure-bearing performance is excellent, it is necessary to avoid instantaneous over-limit violent locking to prevent local stress overload of the gasket in thin plate conditions, causing warping and deformation, and affecting the flat adhesion effect.

4. Keep the assembly surface clean: Before installation, the dust, iron filings, and impurities on the gasket and the workpiece surface should be cleaned to avoid foreign objects being pressed in, causing the board surface to tilt and uneven force distribution, and preventing hidden loosening in the later equipment vibration.

5. Select materials according to requirements: For indoor regular fastening, carbon steel models can be selected to control costs; for outdoor, humid, acidic, alkaline, and high-precision equipment scenarios, it is recommended to use stainless steel models to enhance anti-corrosion and weather resistance performance and service life.

6. Do not stack too many gaskets for leveling: It is not recommended to rely on multiple layers of gaskets to compensate for the hole position error or gap deviation. Excessive stacking will reduce structural stability and easily cause loose positioning and force deviation, affecting the equipment assembly accuracy.

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