Lock Washer 406300555200 - 8.8 alloy steel (40Cr) Suitable Models: NP13
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Lock Washer

OEM Part Numbers Compatible: 406300555200

Lock Washer for Metso NP13 impact crusher, OEM No. 406300555200. Standard-duty design matched to OEM specifications. Made of 8.8 alloy steel (40Cr) with hardness 22-32 HRC. Weight: 0.02 kg. Dimensions: 20 x 20 x 3 mm. Suitable for crushing limestone, coal and gypsum under standard feed conditions.

Material Grade
8.8 alloy steel (40Cr)
Weight
0.02 kg
Hardness
22-32 HRC
Dimensions
20 x 20 x 3 mm
Certification
CE / ISO 9001
Lead Time
7 days
Warranty
12 months

Suitable Model

NP13

Application

Toothed/split lock washer under bolt and nut heads to resist loosening under crusher vibration.

Installation Notes

Fit the free face against the nut/bolt head; replace flattened lock washers on reassembly.

FAQ

What is the purpose of the lock washer?
It prevents bolts and nuts from backing off under the strong vibration of impact crushing.
Can I reuse lock washers?
No; once flattened they lose their spring action, so fit new ones.
How does it differ from a spring washer?
The lock washer uses bent/split tab action; the spring washer is the helical 'grower' type. Both are Class 8.8 steel.

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Lock Washer · 406300555200 · NP13
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