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Seal Washer (Type WD) (CW)

SEAL WASHERS

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Brand :

NOK

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฿ 46.84/Unit
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Product Description

NOK seal washers prevent fluids such as oil from leaking from threads including bolts and flanges in various machines such as automobiles, hydraulic and hydraulic machines, construction/agricultural/transportation machines and prevent the intrusion of water, dust, etc.
[Features]
·Rubber material with excellent tear strength, mechanical strength, oil resistance, and heat resistance is used
·Provides stable sealing performance with easy handling, just like a common metallic washer
[Applications]
·For through bolts
·For drain plugs and oil filler plugs
·For pipe flange fittings
·Also used for leak prevention from the inside of bolts and nuts, or for intrusion prevention from outside

Cross Section and Dimensions of Seal Washer Type WD

*: The cross-sectional view above shows the representative shape of this seal washer.
　　 Roughness is according to JIS B 0601:2001.

metric size / metal ring material: SPCC dimensions

(Unit: mm)

Compatible Thread diameter	Nominal Number	Nominal dimensions				NOK Part number	Dimensions of seal washer								Mounting Dimension
							(1)		(2)	(3)		(4)	(5)		(6)	(7)	(8)	(9)
							Dimensions	Tolerance	Dimensions	Dimensions	Tolerance	Dimensions	Dimensions	Tolerance	Max	min	min	C Chamfering
M4	WD-4	WD	4	10	1.5	CW1002D0	4.0	+0.3 0	6.2	10.0	±0.3	1.5	2.5	±0.2	4.3	7.0	14.0	0.6±0.1
M5	WD-5	WD	5	12	1.8	CW1007D0	5.0	+0.4 0	6.0	12.0	±0.3	1.8	2.8	+0.4 0	5.3	8.0	16.0
M6	WD-6	WD	6	14	1.8	CW1014D2	5.8		7.8	14.0	±0.4	1.8	2.8		6.4	10.0	18.0
M8	WD-8	WD	8	16	2.0	CW1027D0	7.8		10.3	16.0		2.0	3.0		8.4	13.0	20.0
M10	WD-10	WD	10	19	3.0	CW1042D0	9.8		12.8	19.0		3.0	4.0	+0.5 0	10.5	16.0	23.0
M12	WD-12	WD	12	22	3.5	CW1053D2	11.8		14.5	22.0		3.5	5.0		13.0	18.0	26.0
M14	WD-14	WD	14	25	3.5	CW1219D0	13.8		16.5	25.0		3.5	5.0		15.0	21.0	29.0
M16	WD-16	WD	16	26	3.5	CW1077D0	15.8		18.0	26.0		3.5	5.4		17.0	24.0	30.0

Precautions When Using NOK Seal Washers

1. Machining of the Tightening Bearing Surface: WD Type

Tightening bearing surface

·Chamfer the entrance of the female thread. The required size of the chamfer depends on the size of the seal washer. Please refer to the values shown in the dimension table.
·The inner diameter of the rubber section of type WD sealing is the same as the bolt diameter, so there is a risk of scratching the rubber section when a bolt is passed through the seal washer. Therefore, be sure to chamfer the end of bolts.

2. Due to the mechanism of a seal washer, the sealing effect of a washer that is once mounted will be greatly reduced when reassembled, so the manufacturers recommends replacing it with a new one. In particular, the type WD has a mechanism that seals due to large deformation of the rubber section, so please do not reuse it.

3. The ring of type WD seal washer may deform if excessive tightening torque is applied. In addition, the manufacturer recommends using a spring lock washer in combination to add a loose-fitting effect.

4. In order to prevent damage on the rubber section by threads of a bolt, pass the bolt through the seal washer before tightening.

5. The manufacturer recommends retightening of bolts at a proper time after assembly to prevent the tightening torque from decreasing and to improve the sealing performance.

6. When using for light alloy sections, the type WD may damage the mating surface with the metal washer, so the manufacturer recommends using the type WF.