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Left-Hand Threaded-Stud Knobs
1
2
3
4
Knobs have left-hand threads; they're used in applications where counterclockwise motion can loosen common right-hand threads. Mount them into a threaded hole to position, tighten, and hold fixtures, equipment, and machinery.
Steel knobs have a black-oxide finish for mild rust resistance.
Stainless steel knobs have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.
Plastic knobs are a lightweight alternative to metal. They resist oil, grease, and solvents.
Aluminum knobs have mild corrosion resistance, are lightweight, and are nonmagnetic.
For technical drawings and 3-D models, click on a part number.
Head | Hub | Each | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size  | Stud Lg. | Dia. | Ht. | Dia. | Ht. | Stud Material | Temperature Range, °F | 1-9 | 10-Up | |
Style 1—Knurled Grip | ||||||||||
Black-Oxide Steel | ||||||||||
| 1/4"-20 | 1 3/4" | 1" | 1/4" | 5/8" | 1/2" | Steel | __ | 0000000 | 00000 | 00000 |
| 3/8"-16 | 1 3/4" | 1 1/2" | 5/16" | 3/4" | 11/16" | Steel | __ | 0000000 | 00000 | 00000 |
303 Stainless Steel | ||||||||||
| 1/4"-20 | 1 3/4" | 1" | 1/4" | 5/8" | 1/2" | Stainless Steel | __ | 0000000 | 00000 | 00000 |
| 5/16"-18 | 1 3/4" | 1" | 1/4" | 5/8" | 1/2" | Stainless Steel | __ | 0000000 | 00000 | 00000 |
| 3/8"-16 | 1 3/4" | 1 1/2" | 5/16" | 3/4" | 11/16" | Stainless Steel | __ | 0000000 | 00000 | 00000 |
Style 2—Ribbed Grip | ||||||||||
Black Phenolic Plastic | ||||||||||
| 1/4"-20 | 9/16" | 7/8" | 3/8" | 5/8" | 1/8" | Steel | -30° to 400° | 0000000 | 0000 | 0000 |
| 1/4"-20 | 9/16" | 1 1/2" | 3/8" | 11/16" | 3/8" | Steel | -30° to 400° | 0000000 | 0000 | 0000 |
| 1/4"-20 | 3/4" | 1 1/4" | 3/8" | 5/8" | 3/8" | Steel | -30° to 400° | 0000000 | 0000 | 0000 |
Style 3—Four Arm Grip | ||||||||||
Black Phenolic Plastic | ||||||||||
| 1/4"-20 | 1" | 1 1/2" | 1/2" | 5/8" | 1/2" | Steel | -30° to 400° | 0000000 | 0000 | 0000 |
| 3/8"-16 | 1" | 2" | 1/2" | 7/8" | 1/2" | Steel | -30° to 400° | 0000000 | 00000 | 0000 |
Style 4—Four Arm Grip | ||||||||||
Aluminum | ||||||||||
| 1/4"-20 | 1 3/4" | 1 1/2" | 3/8" | 5/8" | 1/2" | Steel | __ | 0000000 | 00000 | 00000 |
| 5/16"-18 | 1 3/4" | 2" | 3/8" | 3/4" | 5/8" | Steel | __ | 0000000 | 00000 | 00000 |
| 3/8"-16 | 1 3/4" | 2" | 3/8" | 3/4" | 5/8" | Steel | __ | 0000000 | 00000 | 00000 |
| 1/2"-13 | 1 3/4" | 2 1/2" | 1/2" | 1 1/8" | 1" | Steel | __ | 0000000 | 00000 | 00000 |