Steel Nylon-Insert Lock Nut, Class 5
ISO 898-2 class 5 nylon-insert prevailing-torque lock nuts to DIN 985 / ISO 10511. The polymer ring resists rotation after tightening on class 4.8 joints. Listed M3–M39.
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Available Sizes & Finishes
19 sizes available
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Applications & Selection Guide
ISO 898-2 class 5 nylon-insert prevailing-torque lock nuts to DIN 985 / ISO 10511 (often called Nyloc). A polyamide ring in the crown deforms onto the bolt thread and resists rotation after tightening. Metric coarse, listed M3–M39. Pair with class 4.8 bolts.
Use on light machinery, guards, enclosures, and assemblies that see vibration but modest preload. The insert is a polymer: typical service is well below ~120 °C, and these nuts are not for fire-rated or oven-cured joints — choose an all-metal DIN 980 lock nut there. Prevailing torque drops with reuse; treat them as limited-reuse. Do not combine with a spring washer as a substitute for a proper lock nut.
Select metric sizes above. Quote with quantity, coating, and destination; matching 4.8 bolts and flat washers can go in the same enquiry.
Technical guides
Bolt grades and sizes: 8.8, 10.9, 12.9, A2 and A4, and metric hex bolt dimensions
What the property classes 4.8, 8.8, 10.9 and 12.9 and stainless A2-70 and A4-70 mean, minimum strength and tensile loads, metric thread pitch and hex head sizes, DIN 933 vs DIN 931, and which nut goes with which bolt.
Read the guide →Nut and washer types compared: hex, lock, flange, castle, coupling, cap and HV nuts, flat, spring and structural washers, with their standards
How hex, thin, nylon-insert and all-metal lock, flange, castle, coupling, cap, wing and HV nuts differ, which nut class goes with which bolt, and when to use DIN 125, DIN 127, DIN 7989 and DIN 6916 washers.
Read the guide →Product Information
Material Grade
ISO 898-2 class 5
Manufacturing Standard
DIN 985 / ISO 10511
Material Type
Steel
Category
Nylon-Insert Lock Nut
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