Nord-Lock Wedge-Lock Washers

Nord-Lock Alloy 718 Washers (NLss-718)

Nickel-alloy washers for high temperatures up to 700 °C, M4 to M20.

Section: Nord-Lock washers
Type: By material

Overview

Alloy 718 (EN 2.4668 or equivalent) has exceptional yield, tensile and creep-rupture strength at high temperatures, together with good corrosion resistance.

That makes these washers the best choice for high-temperature joints in jet engines, gas turbines, turbochargers, incinerators, nuclear reactors and pumps. Laser marking: 718.

Specifications

Product designation	NLss-718, NLspss-718
Material	EN 2.4668 or equivalent, surface hardened
Washer hardness	≥ 620 HV0.05
Corrosion resistance	PREN 29
Temperature	−160 °C to 700 °C
Size range	M4 to M20; #8 to 3/4”
Laser marking	718

Sizes and dimensions (15 items)

Metric	UNC	Product designation	Type	Øi (mm)	Øo (mm)	Thickness T (mm)	Approx. weight (kg/100 pairs)	Min. package (pairs)
M4	#8	NL4ss-718	Regular	4.4	7.6	2.3	0.049	200
M5	#10	NL5ss-718	Regular	5.4	9.0	2.3	0.066	200
M6	—	NL6ss-718	Regular	6.5	10.8	2.3	0.095	200
—	1/4”	NL1/4”ss-718	Regular	7.2	11.5	2.3	0.103	200
M8	5/16”	NL8ss-718	Regular	8.7	13.5	2.3	0.139	200
M8	5/16”	NL8spss-718	Enlarged Ø (sp)	8.7	16.6	2.3	0.259	200
—	3/8”	NL3/8”ss-718	Regular	10.3	16.6	2.3	0.221	200
M10	—	NL10ss-718	Regular	10.7	16.6	2.3	0.210	200
M10	—	NL10spss-718	Enlarged Ø (sp)	10.7	21.0	2.3	0.421	200
M12	—	NL12ss-718	Regular	13.0	19.5	2.3	0.277	200
M12	—	NL12spss-718	Enlarged Ø (sp)	13.0	25.4	3.2	0.886	100
—	1/2”	NL1/2”ss-718	Regular	13.5	19.5	2.3	0.259	200
M16	5/8”	NL16ss-718	Regular	17.0	25.4	3.2	0.669	100
—	3/4”	NL3/4”ss-718	Regular	20.0	30.7	3.2	1.024	100
M20	—	NL20ss-718	Regular	21.4	30.7	3.2	0.911	100

Tolerances. Øi: ±0.1 mm (NL4ss-718–NL8spss-718), ±0.2 mm (NL3/8″ss-718–NL20ss-718). Øo: ±0.2 mm. T: ±0.4 mm (NL4ss-718–NL12ss-718, NL1/2″ss), ±0.5 mm (NL12spss-718–NL20ss-718). Torque values on request.