Products for bench top machinists | LittleMachineShop.com

Key, Lead Screw

Key, Lead Screw - Main image
$2.56 $4.19 In stock

Key, Lead Screw is a replacement lead screw key intended for SC4 bench lathes. It is listed under the Sieg Industrial Group brand and corresponds to part number 343 on the SC4 parts diagram (SC4-343).

  • Product: Key, Lead Screw
  • Brand: Sieg Industrial Group
  • SKU: 5233 (Standard)
  • Part number reference: 343 on the SC4 parts diagram (SC4-343)
  • Compatible machine reference: SC4 bench lathes
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Customer Reviews (4.6 / 5 · 5 reviews)

Andrew ★★★★★

Took a chance on this since the part diagram listed it as 343, and it dropped right into the SC4’s keyway without any filing needed. The machining on the key itself is clean and square, so the lead screw sits snug with no wobble.

Lucy ★★★★★

Exact match for the SC4 part 343 slot, and the steel key engages the lead screw without any wobble. Took me five minutes to swap out, and threading is smooth again.

Violet F. ★★★★★

Fits my SC4 lathe perfectly, and the keyway is machined clean enough that it slides in without any fiddling. Took less than five minutes to swap out the old one. Exactly the part I needed.