Sudan DIN 25201 Double Stack Self-locking Washer

The double-layer self-locking (locking) washer DIN25201 consists of two interlocking inner toothed surfaces, with finely inclined radial teeth on the outside and large-angle helical teeth on the inside.

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SudanLock Washer

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Product Description

Double-layer self-locking (locking) washer DIN25201 consists of two interlocking internal tooth surfaces, with fine radial inclined teeth on the outside and large-angle helical teeth on the inside. The angle of the helical teeth is greater than the thread angle. When the fastener vibrates, the bolt connection tends to loosen due to continuous vibration. Only the helical teeth on the inner side of the washer are allowed to produce relative displacement, generating increased tension to achieve complete anti-loosening effect. The double-layer self-locking (locking) washer uses geometric principles to securely lock bolt connections under intense vibration.

There are several advantages:

a. Highest safety performance

b. Prevents loosening caused by vibration and dynamic loads

c. Easy to install and remove, unaffected by original clamping force

d. Locking effect is not affected by lubrication

e. Provides good locking effect regardless of the level of preload

f. Allows uniform preload level

g. Has the same temperature characteristics as standard bolts/nuts

h. Can be disassembled and reused multiple times with guaranteed performance. Using double-layer self-locking (locking) washers when fastening bolts to connecting rods can completely lock bolts subjected to severe vibration and dynamic loads, providing very stable anti-loosening performance.

Specifications	Specifications	UNC	Inner Diameter Ø _i [mm]	Outer Diameter Ø _o [mm]	Thickness T [mm]	Minimum Packaging Quantity [pairs]	Weight per 100 pairs (kg)
NL3	NL3	M3	#5	3.4	7.0	1.8	200	0.03
NL3.5	NL3.5	M3.5	#6	3.9	7.8	1.8	200	0.04
NL3.5sp	NL3.5sp	M3.5	#6	3.9	9.0	1.8	200	0.06
NL4	NL4	M4	#8	4.4	7.6	1.8	200	0.04
NL4sp	NL4sp	M4	#8	4.4	9.0	1.8	200	0.06
NL5	NL5	M5	#10	5.4	9.0	1.8	200	0.05
NL5sp	NL5sp	M5	#10	5.4	10.8	1.8	200	0.11
NL6	NL6	M6	#10	6.5	10.8	1.8	200	0.07
NL6sp	NL6sp	M6	#10	6.5	13.5	1.8	200	0.17
				6.5	10.8	2.5	200	0.20
NL1/4"	NL1/4"		1/4"	7.2	11.5	1.8	200	0.08
NL1/4"sp	NL1/4"sp		1/4"	7.2	13.5	2.5	200	0.18
				7.2	13.5	2.5	200	0.15
NL8	NL8	M8	5/16"	8.7	16.6	2.5	200	0.28
NL8sp	NL8sp	M8	5/16"	8.7	16.6	2.5	200	0.23
NL3/8"	NL3/8"		3/8"	10.3	21.0	2.5	200	0.48
NL3/8"sp	NL3/8"sp		3/8"	10.3	21.0	2.5	200	0.48
NL10	NL10	M10		10.7	16.6	2.5	200	0.22
NL10sp	NL10sp	M10		10.7	21.0	2.5	200	0.27
NL11	NL11	M11	7/16"	11.4	18.5	2.5	200	0.29
NL12	NL12	M12		13.0	19.5	2.5	200	0.29
NL12sp	NL12sp	M12		13.0	25.4	3.4	100	0.93
NL1/2"	NL1/2"		1/2"	13.5	19.5	2.5	200	0.27
NL1/2"sp	NL1/2"sp		1/2"	13.5	25.4	3.4	100	0.90
NL14	NL14	M14	9/16"	15.2	23.0	3.4	100	0.56
NL14D	NL14D	M14	9/16"	15.2	30.7	3.4	100	1.41
NL16	NL16	M16	5/8"	17.0	25.4	3.4	100	0.69
NL16sp	NL16sp	M16	5/8"	17.0	30.7	3.4	100	1.29
NL18	NL18	M18		19.5	29.0	3.4	100	0.85
NL18sp	NL18sp	M18		19.5	34.5	3.4	100	1.58
NL3/4"	NL3/4"		3/4"	20.0	30.7	3.4	100	1.05
NL3/4"sp	NL3/4"sp		3/4"	20.0	39.0	3.4	100	2.20
NL20	NL20	M20		21.4	30.7	3.4	100	0.95
NL20sp	NL20sp	M20		21.4	39.0	3.4	100	2.03
NL22	NL22	M22	7/8"	23.4	34.5	3.4	100	1.29
NL22sp	NL22sp	M22	7/8"	23.4	42.0	4.6	50	3.31
NL24	NL24	M24		25.3	39.0	3.4	100	1.68
NL24sp	NL24sp	M24		25.3	48.5	4.6	50	4.51
NL1"	NL1"		1"	27.9	39.0	3.4	100	1.53
NL1"sp	NL1"sp		1"	27.9	48.5	4.6	50	4.20
NL27	NL27	M27		28.4	42.0	5.8	50	3.29
NL27sp	NL27sp	M27		28.4	48.5	5.8	25	5.39
NL30	NL30	M30	1 - 1/8"	31.4	47.0	5.8	50	4.20
NL30sp	NL30sp	M30	1 - 1/8"	31.4	58.5	6.6	25	8.96
NL33	NL33	M33	1 - 1/4"	34.4	48.5	5.8	25	3.97
NL33sp	NL33sp	M33	1 - 1/4"	34.4	58.5	6.6	25	8.31
NL36	NL36	M36	1 - 3/8"	37.4	55.0	5.8	25	5.59
NL36sp	NL36sp	M36	1 - 3/8"	37.4	63.0	6.6	25 *	9.15
NL39	NL39	M39	1 - 1/2"	40.4	58.5	5.8	25 *	6.28
NL42	NL42	M42		43.2	63.0	5.8	25 *	7.47
NL45	NL45	M45	1 - 3/4"	46.2	70.0	7.0	25 *	10.20
NL48	NL48	M48		49.6	75.0	7.0	25 *	12.00
NL52	NL52	M52	2"	53.6	80.0	7.0	25 *	13.00
NL56	NL56	M56	2 - 1/4"	59.1	85.0	7.0	10 *	13.50
NL60	NL60	M60		63.1	90.0	7.0	10 *	15.20
NL64	NL64	M64	2 - 1/2"	67.1	95.0	7.0	10 *	16.70
NL68	NL68	M68		71.1	100.0	9.5	1 *	28.19
NL72	NL72	M72		75.1	105.0	9.5	1 *	30.70
NL76	NL76	M76	3"	79.1	110.0	9.5	1 *	33.31
NL80	NL80	M80	3 - 1/8"	83.1	115.0	9.5	1 *	36.02
NL85	NL85	M85		88.1	120.0	9.5	1 *	37.84
NL90	NL90	M90		92.4	130.0	9.5	1 *	47.67
NL95	NL95	M95		97.4	135.0	9.5	1 *	48.91
NL100	NL100	M100	4"	103.4	145.0	9.5	1 *	59.81
NL105	NL105	M105		108.4	150.0	9.5	1 *	61.29
NL110	NL110	M110		113.4	155.0	9.5	1 *	63.65
NL115	NL115	M115		118.4	165.0	9.5	1 *	75.28
NL120	NL120	M120		123.4	170.0	9.5	1 *	77.94
NL130	NL130	M130	5"	133.4	178.0	9.5	1 *	79.17