Nord-Lock 254 SMO washers

Nord-Lock washers are easy and effective to use while ensuring structural security for applications exposed to vibration and dynamic loads.

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Product Information

Nord-Lock washers are easy and effective to use while ensuring structural security for applications exposed to vibration and dynamic loads.

Nord-Lock 254 SMOÃ† washers are specially designed for chloride rich processes and salt water solutions / atmospheres, i.e. environments where stainless steel washers made of EN 1.4404 are not suitable.

Dimensions: Millimetres (mm)
Material: EN 1.4547 or equivalent, surface hardened
Finish: Self finish

254 SMOÃ† is a high performance austenitic stainless steel (according to EN 1.4547) with greater mechanical strength and resistance against corrosion than most austenitic stainless steel grades. The material is resilient against pitting and crevice corrosion due to high contents of chromium, nickel, molybdenum and nitrogen.

Installing the washers
The pre-assembled washers are installed in pairs, cam face to cam face. Nord-Lock recommends lubrication when possible.

Tightening
Tighten Nord-Lock washers with standard tools according to the torque guidelines below. Tightening guidelines for other bolt grades are available through your Nord-Lock representative.

Untightening
Untightening Nord-Lock washers is as simple as tightening. Note that since the locking function is not based on increased friction, the untightening torque is generally lower than the tightening torque. Therefore it is not possible to measure offtorque as verification of locking function.

Reusing Nord-Lock
Nord-Lock washers can normally be reused. As with all fasteners, they should be inspected for wear before reassembly. Make sure that the washers are reinstalled correctly cam face to cam face. Nord-Lock recommends lubrication of fasteners before reuse in order to minimize changes in friction conditions.

254 SMO® is a high performance austenitic
stainless steel (according to EN 1.4547) with greater mechanical strength and resistance against corrosion than most austenitic stainless steel grades. The material is resilient against pitting and crevice corrosion due to high contents of chromium, nickel, molybdenum and nitrogen.These washers are specially designed for chloride rich processes and salt water solutions / atmospheres, i.e. environments where stainless steel washers made of EN 1.4404 are not suitable.

Washer Size	Bolt Size		Ã¸i [mm]	Ã¸o [mm]	Thickness T [mm	Min Packaging [Pairs]	Approx Weight kg/100 Pairs
Washer Size	Metric	UNC	Ã¸i [mm]	Ã¸o [mm]	Thickness T [mm	Min Packaging [Pairs]	Approx Weight kg/100 Pairs
NL3ss-254	M3	#5	3,4	7,0	2,2	200	0,04	NL3 ss-254 N L 8 s s – 2 5 4Ã˜i ±0,1 mm
NL3,5ss-254	M3,5	#6	3,9	7,6	2,2	200	0,04
NL3,5spss-254	M3,5	#6	3,9	9,0	2,2	200	0,07
NL4ss-254	M4	#8	4,4	7,6	2,2	200	0,04	NL10 ss-254 N L 3 9 s s – 2 5 4Ã˜i ±0,2 mm
NL4spss-254	M4	#8	4,4	9,0	2,2	200	0,07
NL5ss-254	M5	#10	5,4	9,0	2,2	200	0,06
NL5spss-254	M5	#10	5,4	10,8	2,2	200	0,11
NL6ss-254	M6	–	6,5	10,8	2,2	200	0,09	NL3ss254NL24ss -254Ã˜o ± 0,2 mm
NL6spss-254	M6	–	6,5	13,5	2,0	200	0,16
NL1/4″-254	–	1/4″	7,2	11,5	2,2	200	0,09
NL1/4″spss-254	–	1/4″	7,2	13,5	2,2	200	0,15	NL27ss-254NL39ss-254Ã˜o ± 0,3 mm
NL8ss-254	M8	5/16″	8,7	13,5	2,0	200	0,12
NL8spss-254	M8	5/16″	8,7	16,6	2,0	200	0,22
NL3/8″ss-254	–	3/8″	10,3	16,6	2,0	200	0,19
NL3/8″spss-254	–	3/8″	10,3	21,0	2,2	200	0,38	NL3ss-254NL39ss-254T ± 0,25 mm
NL10ss-254	M10	–	10,7	16,6	2,0	200	0,18
NL10spss-254	M10	–	10,7	21,0	2,0	200	0,37
NL11s s -254	M11	7/16″	11,4	18,5	2,2	200	0,26
NL12ss-254	M12	–	13,0	19,5	2,0	200	0,23
NL12spss-254	M12	–	13,0	25,4	3,0	100	0,82
NL1/2″ss-254	–	1/2″	13,5	19,5	2,2	200	0,23
NL1/2″spss-254	–	1/2″	13,5	25,4	3,2	100	0,80
NL14ss-254	M14	9/16″	15,2	23,0	3,0	100	0,49
NL14spss-254	M14	9/16″	15,2	30,7	3,2	100	1,31
NL16ss-254	M16	5/8″	17,0	25,4	3,0	100	0,59
NL16spss-254	M16	5/8″	17,0	30,7	3,2	100	1,13
NL18ss-254	M18	–	19,5	29,0	3,2	100	0,80
NL18spss-254	M18	–	19,5	34,5	3,2	100	1,56
NL3/4″ss-254	–	3/4″	20,0	30,7	3,2	100	0,96
NL3/4″spss-254	–	3/4″	20,0	39,0	3,2	100	2,14
NL20ss-254	M20	–	21,4	30,7	3,0	100	0,82
NL20spss-254	M20	–	21,4	39,0	3,2	100	1,98
NL22ss-254	M22	7/8″	23,4	34,5	3,2	100	1,19
NL22spss-254	M22	7/8″	23,4	42,0	3,2	50	2,44
NL24ss-254	M24	–	25,3	39,0	3,2	100	1,65
NL24spss-254	M24	–	25,3	48,5	3,2	50	3,50
NL1″s s-254	–	1″	27,9	39,0	3,2	100	1,42
NL1″sps s-254	–	1″	27,9	48,5	3,2	50	3,22
NL27ss-254	M27	–	28,4	42,0	5,8	50	3,10
NL27spss-254	M27	–	28,4	48,5	5,8	25	5,85
NL30ss-254	M30	1 1/8″	31,4	47,0	5,8	50	4,04
NL33ss-254	M33	1 1/4″	34,4	48,5	5,8	25	4,25
NL36ss-254	M36	1 3/8″	37,4	55,0	5,8	25	5,96
NL39ss-254	M39	1 1/2″	40,4	58,5	5,8	25	6,74

With ISO9001: 2015 approval incorporating Design Status, our qualified engineering staff are able to offer a completely free of charge engineering service and are available to assist with part selection, custom design, application requirements, material selection and more.

Applications are discussed in-depth, first-off design data and drawings are submitted for approval to ensure our customers are provided with the correct design, first time. However, on those rare occasions when modifications are necessary, our no-tooling process and flexible manufacturing procedures means the production of prototypes is easily and economically achieved without onerous tooling charges and long lead times.

At TFC we realise that Quality runs through the entire business, not just our products. We have continually invested in the right people to provide the superior market knowledge and customer service.

Our supply chain partners, from manufacturers to logistics and information technology are carefully chosen to ÿt our commitment to quality