SHARS 8" 4 JAW INDEPENDENT LATHE CHUCK TIR CERTIFICATE + 1-1/2"-8 BACK PLATE NEW
Each high quality chuck comes with a certification
Product Code
Chuck Product description
Product description
- Chuck diameter: 8"
- Thickness: 2.953"
- Thru Hole Diamter: 2.953"
- Bolt Circle Diameter: 3.740"
- Number of Jaws: 4
- Back mounting: Plain back
Product application
For use gripping odd shaped work
Product features
- A matching back plate would need to be machined on the face and hub OD in order to fit this chuck. For detailed information, please look for the Shars back plate machining guide.
- Chuck includes one set of reversible jaws
- Jaws are individually adjustable
- Four jaws allow a square component to be perfectly centered to the chuck while achieving maximum gripping force
- Chuck bodies are semi-steel
- Jaws are made of high quality carbon steel, and hardened
- Thrust bearings and operating screws are made of case hardened steel
- Internal Jaw:
- Clamping Range A-A1: 0.591-5.118"
- Jamming Range B-B1: 3.150-9.843"
| size (inch) | Back Mounting | D (inch) | D1 (inch) | D2 (inch) | D3 (inch) | H (inch) | H1 (inch) | h (inch) | h1 (inch) | z-d (metric) |
| 8 | plain back | 7.874 | 2.953 | 3.740 | 2.205 | 4.331 | 2.953 | 0.236 | 　 | 4 x M10 |
- Included 1 set of reversible solid hard jaws
- 4 mounting screws
- 1 lathe chuck key
Back Plate (202-6203)
Description:
- Mounting Thread Size: T=1-1/2-8 TPI
- Shoulder Diameter: D1=2.953"
- Bolt Circle Diameter: D2=3.74"
- Hub Length: C=0.669''
- Hub Diameter: D=3.58''
- Flange Thickness: B=0.68''
- Shoulder boss: h=0.185''
- No. of Bolt Holes: 4
- Mounting Thread Size: T=1-1/2-8 TPI
- Shoulder Diameter: D1=2.953"
- Bolt Circle Diameter: D2=3.74"
- Hub Length: C=0.669''
- Hub Diameter: D=3.58''
- Flange Thickness: B=0.68''
- Shoulder boss: h=0.185''
- No. of Bolt Holes: 4
How to process back plate to guarantee Chuck's T.I.R?
Fully machined back plate can be mounted onto 8" 4 jaw self Independent chuck (p/n 202-5421). As long as back plate Shoulder Diameter > chuck's D1, all 8" chuck will fit in. All back plates have 0.04" allowance, please measure the size of Chuck's D1 before process your back plates. The size of back plates's D1 should be a little bit smaller than the size of Chuck's D1. Because the gap between back plate and chuck is smaller, chuck's TIR is better. No gap is the best. D1 need to be processed before back plate can be mounted.
You would not need to drill any mounting holes but you will need to turn the shoulder down .040" to match the back of the lathe chuck to make the chuck & back plate more concentric with the lathe spindle. When turning the shoulder of the backing plate, ONLY TURN THE SHOULDER OF THE BACKING PLATE WHEN ATTACHED TO THE LATHE SPINDLE. If you use a chuck to clamp the backing plate and then turn it, the backing plate will not be true to the lathe spindle and will have more runout than specified when the chuck and back plate are put together.
Lathe Lathe Chuck Diameter
| BRAND | MODEL | SWING | SPINDEL THREAD | 3" | 4" | 5" | 6" |
|---|---|---|---|---|---|---|---|
| ATLAS | 6" | 1/2"-20 | 202-6231 | ||||
| ATLAS | 10100 | 6" | 1"-10 | 202-6107-6, 202-6107-3 | |||
| ATLAS | TH42 | 10" | 1 1/2"-8 | 202-6230 | 202-6108-6, 202-6108-3 | 202-6192 | 202-9106, 202-6119 |
| ATLAS | 5991 | 12" | 1 1/2"-8 | 202-6230 | 202-6108-6, 202-9108-3 | 202-6192 | 202-6109, 202-6119 |
| ATLAS | 3986 | 12" | 1 1/2"-8 | 202-6230 | 202-6108-6, 202-6108-3 | 202-6192 | 202-6109, 202-6119 |
| EMCO MAIER | MAXIMAT V10 | 5" | M39X4MM | 202-6214 | 202-6215, 202-6217 | ||
| GRIZZLY | G8688 | 7" | 3" FLANGE | ||||
| GRIZZLY | G4000 | 9" | M39X4MM | 202-6214 | 202-6215, 202-6217 | ||