Nord-Lock Wedge-Lock Washers

Nord-Lock Alloy C-276 Washers (NLss-276)

Nickel-alloy washers for acidic and aggressive chemical environments, M4 to M20.

Section: Nord-Lock washers
Type: By material

Overview

Washers made from Alloy C-276 (EN 2.4819 or equivalent) are extremely corrosion resistant and protect against aggressive and localised corrosion, so they are well suited to chemical plants.

They resist oxidisers such as ferric and cupric chlorides, hot contaminated organic and inorganic media, wet chlorine gas, acids, hypochlorite and chlorine dioxide. Laser marking: 276.

Specifications

Product designation	NLss-276, NLspss-276
Material	EN 2.4819 or equivalent, surface hardened
Washer hardness	≥ 520 HV0.05
Corrosion resistance	PREN 68
Temperature	−160 °C to 500 °C
Size range	M4 to M20; #8 to 5/8”
Laser marking	276

Sizes and dimensions (11 items)

Metric	UNC	Product designation	Type	Øi (mm)	Øo (mm)	Thickness T (mm)	Approx. weight (kg/100 pairs)	Min. package (pairs)
M4	#8	NL4ss-276	Regular	4.4	7.6	2.3	0.053	200
M5	#10	NL5ss-276	Regular	5.4	9.0	2.3	0.072	200
M6	—	NL6ss-276	Regular	6.5	10.8	2.3	0.104	200
M8	5/16”	NL8ss-276	Regular	8.7	13.5	2.3	0.151	200
M8	5/16”	NL8spss-276	Enlarged Ø (sp)	8.7	16.6	2.3	0.281	200
M10	—	NL10ss-276	Regular	10.7	16.6	2.3	0.228	200
M10	—	NL10spss-276	Enlarged Ø (sp)	10.7	21.0	2.3	0.457	200
M12	—	NL12ss-276	Regular	13.0	19.5	2.3	0.300	200
M12	—	NL12spss-276	Enlarged Ø (sp)	13.0	25.4	3.0	0.962	100
M16	5/8”	NL16ss-276	Regular	17.0	25.4	3.0	0.726	100
M20	—	NL20ss-276	Regular	21.4	30.7	3.0	0.989	100

Tolerances. Øi: ±0.1 mm (NL4ss-276–NL8spss-276), ±0.2 mm (NL10ss-276–NL20ss-276). Øo: ±0.2 mm. T: ±0.4 mm (NL4ss-276–NL12ss-276), ±0.5 mm (NL12spss-276–NL20ss-276). Torque values on request.