Step Machine Key Stock
When a keyway is damaged, cut a new, wider one. This key stock is stepped to match repaired keyways in shafts or gears. Cut it to length to create the machine key you need.
Steel key stock is an economical choice with good strength. 18-8 stainless steel key stock offers a balance of strength and corrosion resistance. It may be mildly magnetic.
Slightly larger than the size listed in the table, oversized stock fits tightly in a keyway. Press it into place for use in high-torque applications or to replace a key in a worn keyway. Slightly smaller than the size listed in the table, undersized stock is the choice when you need a slightly looser fit or when you have an inconsistent keyway.
For technical drawings and 3-D models, click on a part number.
Key Stock for Gears
For Gears
For Gears
For Hub Keyway | For Shaft Keyway | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Wd. (A) | Ht. (B) | Wd. (A) Tolerance | Wd. (C) | Ht. (D) | Wd. (C) Tolerance | Ht. | Tolerance Rating | Ht. Tolerance | Each | |
1018-1045 Carbon Steel | ||||||||||
12" Lg. | ||||||||||
| 3/16" | 3/32" | 0.000" to 0.002" | 1/8" | 1/16" | 0.000" to 0.002" | 5/32" | Oversized | -0.015" to 0.015" | 00000000 | 000000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 5/16" | 1/8" | 0.000" to 0.002" | 5/16" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 5/16" | 5/32" | 0.000" to 0.002" | 11/32" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
| 3/4" | 3/8" | 0.000" to 0.002" | 5/8" | 5/16" | 0.000" to 0.002" | 11/16" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
Zinc-Plated 1018-1045 Carbon Steel | ||||||||||
12" Lg. | ||||||||||
| 3/16" | 3/32" | 0.000" to 0.002" | 1/8" | 1/16" | 0.000" to 0.002" | 5/32" | Standard | -0.015" to 0.015" | 000000000 | 00000 |
| 3/16" | 3/32" | 0.000" to 0.002" | 1/8" | 1/16" | 0.000" to 0.002" | 5/32" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 5/16" | 1/8" | 0.000" to 0.002" | 5/16" | Standard | -0.012" to 0.014" | 000000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 5/16" | 1/8" | 0.000" to 0.002" | 5/16" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 5/16" | 5/32" | 0.000" to 0.002" | 11/32" | Standard | -0.012" to 0.014" | 000000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 5/16" | 5/32" | 0.000" to 0.002" | 11/32" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 1/2" | 1/4" | 0.000" to 0.002" | 7/16" | 5/32" | 0.000" to 0.002" | 13/32" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 1/2" | 1/4" | 0.000" to 0.002" | 7/16" | 5/32" | 0.000" to 0.002" | 13/32" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 5/8" | 5/16" | 0.000" to 0.002" | 3/8" | 3/16" | 0.000" to 0.002" | 1/2" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 5/8" | 5/16" | 0.000" to 0.002" | 3/8" | 3/16" | 0.000" to 0.002" | 1/2" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 3/4" | 3/8" | 0.000" to 0.002" | 1/2" | 1/4" | 0.000" to 0.002" | 5/8" | Standard | -0.014" to 0.015" | 000000000 | 00000 |
| 3/4" | 3/8" | 0.000" to 0.002" | 1/2" | 1/4" | 0.000" to 0.002" | 5/8" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 3/4" | 3/8" | 0.000" to 0.002" | 5/8" | 3/16" | 0.000" to 0.002" | 9/16" | Standard | -0.014" to 0.015" | 000000000 | 00000 |
| 3/4" | 3/8" | 0.000" to 0.002" | 5/8" | 3/16" | 0.000" to 0.002" | 9/16" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 3/4" | 3/8" | 0.000" to 0.002" | 5/8" | 5/16" | 0.000" to 0.002" | 11/16" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 3/4" | 3/8" | 0.000" to 0.002" | 5/8" | 5/16" | 0.000" to 0.002" | 11/16" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 1" | 1/2" | 0.000" to 0.002" | 7/8" | 7/16" | 0.000" to 0.002" | 15/16" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 1" | 1/2" | 0.000" to 0.002" | 7/8" | 7/16" | 0.000" to 0.002" | 15/16" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
18-8 Stainless Steel | ||||||||||
12" Lg. | ||||||||||
| 3/16" | 3/32" | 0.000" to 0.003" | 1/8" | 1/16" | 0.000" to 0.002" | 5/32" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.003" | 5/16" | 1/8" | 0.000" to 0.002" | 5/16" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.003" | 5/16" | 5/32" | 0.000" to 0.002" | 11/32" | Oversized | -0.015" to 0.015" | 00000000 | 000000 |
| 3/4" | 3/8" | 0.000" to 0.005" | 5/8" | 5/16" | 0.000" to 0.002" | 11/16" | Oversized | -0.015" to 0.015" | 00000000 | 000000 |
Key Stock for Shafts
For Shafts
For Shafts
For Hub Keyway | For Shaft Keyway | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Wd. (A) | Ht. (B) | Wd. (A) Tolerance | Wd. (C) | Ht. (D) | Wd. (C) Tolerance | Ht. | Tolerance Rating | Ht. Tolerance | Each | |
Zinc-Plated 1018-1045 Carbon Steel | ||||||||||
12" Lg. | ||||||||||
| 3/16" | 3/32" | 0.000" to 0.002" | 1/4" | 3/32" | 0.000" to 0.002" | 3/16" | Standard | -0.015" to 0.015" | 000000000 | 000000 |
| 3/16" | 3/32" | 0.000" to 0.002" | 1/4" | 3/32" | 0.000" to 0.002" | 3/16" | Undersized | -0.015" to 0.015" | 000000000 | 0000 |
| 3/16" | 3/32" | 0.000" to 0.002" | 1/4" | 1/8" | 0.000" to 0.002" | 7/32" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 3/16" | 3/32" | 0.000" to 0.002" | 1/4" | 1/8" | 0.000" to 0.002" | 7/32" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 1/4" | 1/8" | 0.000" to 0.002" | 5/16" | 1/8" | 0.000" to 0.002" | 1/4" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 1/4" | 1/8" | 0.000" to 0.002" | 5/16" | 1/8" | 0.000" to 0.002" | 1/4" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 1/4" | 1/8" | 0.000" to 0.002" | 3/8" | 1/8" | 0.000" to 0.002" | 1/4" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 1/4" | 1/8" | 0.000" to 0.002" | 3/8" | 1/8" | 0.000" to 0.002" | 1/4" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 1/4" | 1/8" | 0.000" to 0.002" | 3/8" | 3/16" | 0.000" to 0.002" | 5/16" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 1/4" | 1/8" | 0.000" to 0.002" | 3/8" | 3/16" | 0.000" to 0.002" | 5/16" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 7/16" | 5/32" | 0.000" to 0.002" | 11/32" | Standard | -0.012" to 0.014" | 000000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 7/16" | 5/32" | 0.000" to 0.002" | 11/32" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 1/2" | 3/16" | 0.000" to 0.002" | 3/8" | Standard | -0.012" to 0.014" | 000000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 1/2" | 3/16" | 0.000" to 0.002" | 3/8" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 1/2" | 1/4" | 0.000" to 0.002" | 7/16" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 1/2" | 1/4" | 0.000" to 0.002" | 7/16" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 1/2" | 1/4" | 0.000" to 0.002" | 9/16" | 3/16" | 0.000" to 0.002" | 7/16" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 1/2" | 1/4" | 0.000" to 0.002" | 5/8" | 3/16" | 0.000" to 0.002" | 7/16" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 1/2" | 1/4" | 0.000" to 0.002" | 5/8" | 3/16" | 0.000" to 0.002" | 7/16" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 1/2" | 1/4" | 0.000" to 0.002" | 5/8" | 5/16" | 0.000" to 0.002" | 9/16" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 1/2" | 1/4" | 0.000" to 0.002" | 5/8" | 5/16" | 0.000" to 0.002" | 9/16" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 1/2" | 1/4" | 0.000" to 0.002" | 11/16" | 1/4" | 0.000" to 0.002" | 1/2" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 5/8" | 5/16" | 0.000" to 0.002" | 11/16" | 1/4" | 0.000" to 0.002" | 9/16" | Standard | -0.014" to 0.014" | 000000000 | 00000 |
| 3/4" | 3/8" | 0.000" to 0.002" | 7/8" | 7/16" | 0.000" to 0.002" | 13/16" | Standard | -0.014" to 0.015" | 000000000 | 00000 |
| 3/4" | 3/8" | 0.000" to 0.002" | 7/8" | 7/16" | 0.000" to 0.002" | 13/16" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
| 3/4" | 3/8" | 0.000" to 0.002" | 1" | 1/2" | 0.000" to 0.002" | 7/8" | Standard | -0.014" to 0.015" | 000000000 | 000000 |
| 3/4" | 3/8" | 0.000" to 0.002" | 1" | 1/2" | 0.000" to 0.002" | 7/8" | Undersized | -0.015" to 0.015" | 000000000 | 00000 |
1018-1045 Carbon Steel | ||||||||||
12" Lg. | ||||||||||
| 3/16" | 3/32" | 0.000" to 0.002" | 1/4" | 1/8" | 0.000" to 0.002" | 7/32" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
| 1/4" | 1/8" | 0.000" to 0.002" | 3/8" | 1/8" | 0.000" to 0.002" | 1/4" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
| 1/4" | 1/8" | 0.000" to 0.002" | 3/8" | 3/16" | 0.000" to 0.002" | 5/16" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 7/16" | 5/32" | 0.000" to 0.002" | 11/32" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 1/2" | 3/16" | 0.000" to 0.002" | 3/8" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 1/2" | 1/4" | 0.000" to 0.002" | 7/16" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
| 1/2" | 1/4" | 0.000" to 0.002" | 5/8" | 5/16" | 0.000" to 0.002" | 9/16" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
| 3/4" | 3/8" | 0.000" to 0.002" | 7/8" | 7/16" | 0.000" to 0.002" | 13/16" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
18-8 Stainless Steel  | ||||||||||
12" Lg. | ||||||||||
| 3/16" | 3/32" | 0.000" to 0.002" | 1/4" | 3/32" | 0.000" to 0.003" | 3/16" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
| 3/16" | 3/32" | 0.000" to 0.002" | 1/4" | 1/8" | 0.000" to 0.003" | 7/32" | Oversized | -0.015" to 0.015" | 00000000 | 000000 |
| 1/4" | 1/8" | 0.000" to 0.002" | 5/16" | 1/8" | 0.000" to 0.003" | 1/4" | Oversized | -0.015" to 0.015" | 00000000 | 00000 |
| 1/4" | 1/8" | 0.000" to 0.002" | 3/8" | 1/8" | 0.000" to 0.003" | 1/4" | Oversized | -0.015" to 0.015" | 00000000 | 000000 |
| 1/4" | 1/8" | 0.000" to 0.002" | 3/8" | 3/16" | 0.000" to 0.003" | 5/16" | Oversized | -0.015" to 0.015" | 00000000 | 000000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 7/16" | 5/32" | 0.000" to 0.003" | 11/32" | Oversized | -0.015" to 0.015" | 00000000 | 000000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 1/2" | 3/16" | 0.000" to 0.003" | 3/8" | Oversized | -0.015" to 0.015" | 00000000 | 000000 |
| 3/8" | 3/16" | 0.000" to 0.002" | 1/2" | 1/4" | 0.000" to 0.003" | 7/16" | Oversized | -0.015" to 0.015" | 00000000 | 000000 |
| 1/2" | 1/4" | 0.000" to 0.002" | 5/8" | 5/16" | 0.000" to 0.005" | 9/16" | Oversized | -0.015" to 0.015" | 00000000 | 000000 |
| 3/4" | 3/8" | 0.000" to 0.002" | 7/8" | 7/16" | 0.000" to 0.005" | 13/16" | Oversized | -0.015" to 0.015" | 00000000 | 000000 |
Step Key Assortments
For Gears
For Shafts
For Gears
For Shafts
Also known as offset key stock, use step keys to repair keyways in gears and shafts. Made from zinc-plated steel, they resist corrosion in wet environments.
| Number of Pieces | Step Keys for Gears Included | Step Keys for Shafts Included | Tolerance Rating | Container Type | Each | |
Zinc-Plated 1018-1045 Carbon Steel | ||||||
|---|---|---|---|---|---|---|
| 7 | 3/16" (A) × 3/32" (B) × 1/8" (C) × 1/16" (D) × 5/32" Ht. × 12" Lg. (1 Piece) 3/8" (A) × 3/16" (B) × 5/16" (C) × 5/32" (D) × 11/32" Ht. × 12" Lg. (1 Piece) | 3/16" (A) × 3/32" (B) 1/4" (C) × 1/8" (D) × 7/32" Ht. × 12" Lg. (1 Piece) 1/4" (A) × 1/8" (B) 5/16" (C) × 1/8" (D) × 1/4" Ht. × 12" Lg. (1 Piece) 1/4" (A) × 1/8" (B) 3/8" (C) × 3/16" (D) × 5/16" Ht. × 12" Lg. (1 Piece) 3/8" (A) × 3/16" (B) 1/2" (C) × 1/4" (D) × 7/16 Ht. × 12" Lg. (1 Piece) 1/2" (A) × 1/4" (B) 5/8" (C) × 5/16" (D) × 9/16" Ht. × 12" Lg. (1 Piece) | Oversized | Cardboard Box | 000000000 | 000000 |