Products for bench top machinists | LittleMachineShop.com

Key, 3x20 mm

Key, 3x20 mm - Main image
$0.62 $0.95 In stock

Key, 3x20 mm is a replacement key listed for bench top machinist applications. It is associated with the SC4 key parts diagram reference SC4-202A and is offered under the Sieg Industrial Group brand.

  • Product name: Key, 3x20 mm
  • Brand: Sieg Industrial Group
  • Parts diagram reference: SC4-202A
  • SKU: 4408 (Standard)
  • Listed for use with SC4 key parts
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Customer Reviews (3.8 / 5 · 5 reviews)

Abigail ★★★★★

Picked this up for my lathe after misplacing the original — the 3x20 mm dimensions matched the parts diagram perfectly, no filing needed. The finish is clean and uniform, so it slides right into the keyway without any binding.

Daniel ★★★★☆

Fits the SC4 diagram reference exactly as listed, so swapping out the old key was straightforward. It's a basic 3x20 mm spare, nothing fancy, but it does the job for my bench setup. Would've liked a bit more info on the material, but for the price it's fine.

David ★★★★☆

The 3x20 mm dimensions matched the original part from my SC4 lathe perfectly. Fit snug without any filing needed.