TOP-TOOL 3-Jaw Self-Centering Lathe Chuck 80mm

TOP-TOOL Professional 4-Jaw Self-Centering Lathe Chuck, 320mm / 12-Inch, Clamping Range 11.5–320 mm (0.45–12.60 in), Solid One-Piece Jaws, Outside Jaws Mounted + Inside Jaw Set, T-Key, Plain Back

$700.00 CAD
$700.00 CAD
TOP-TOOL Professional 4-Jaw Self-Centering Lathe Chuck, 320mm / 12-Inch, Clamping Range 11.5–320 mm (0.45–12.60 in), Solid One-Piece Jaws, Outside Jaws Mounted + Inside Jaw Set, T-Key, Plain Back

TOP-TOOL Professional 4-Jaw Self-Centering Lathe Chuck, 320mm / 12-Inch, Clamping Range 11.5–320 mm (0.45–12.60 in), Solid One-Piece Jaws, Outside Jaws Mounted + Inside Jaw Set, T-Key, Plain Back

$700.00 CAD
$700.00 CAD

Professional 320mm / 12-Inch 4-Jaw Self-Centering Lathe Chuck (Solid One-Piece Jaws)

Built for metal lathes, wood lathes, drill presses, milling machines, CNC machining centers, grinders, and other equipment that needs self-centering workholding. The TOP-TOOL 320 mm chuck delivers rigid gripping when mounted with the correct adapter plate or fixture. HT300 cast iron body, AISI 5140 scroll and bevel gears, AISI 1045 jaws. Overall clamping envelope 11.5–320 mm (0.45–12.60 in) across the three modes below.

Premium Materials & Hardening

Component Material Hardness (HRC)
Body HT300 Cast Iron —
Jaws AISI 1045 Carbon Steel 52–58
Scroll Plate AISI 5140 Alloy Steel 43–48
Bevel Gears AISI 5140 Alloy Steel 45–50
Back Plate Aluminum / Engineered Plastic —

Clamping ranges

Outside clamping with solid outside jaws (standard setup): 11.5–145 mm gripping on the outside diameter.

Inside support / expanding with the same outside jaws: 95–320 mm internal gripping (boring-style holding).

Outside clamping with solid inside (reverse) jaws: 110–320 mm for large-diameter OD work.

Summary: overall envelope 11.5–320 mm (0.45–12.60 in) depending on jaw configuration.

Key Features

  • Heavy-Duty HT300 Cast Iron: High mass and damping for large workpieces and heavy cuts.
  • Hardened Scroll & Gears: AISI 5140 scroll (HRC 43–48) and bevel gears (HRC 45–50).
  • Hardened Jaws (HRC 52–58): AISI 1045 for grip and wear resistance.
  • Guaranteed Precision: Checked with four different test bars as part of our acceptance process. Repeatability ≤0.05 mm (0.002").
  • Plain Back Mount: D1 = 265 mm locating register, recess depth h = 7.5 mm; D2 = 290 mm bolt circle; 3× M16 mounting holes. Machine your adapter to match D1/D2. Adapter plate not included.
  • Solid One-Piece Jaws: Outside jaws are pre-mounted on the chuck. A separate inside (reverse) solid jaw set is included in the box (not a duplicate of the mounted set).
  • T-Key Included.

Jaw type

This listing uses one-piece solid jaws. For chucks with two-piece master and top jaws, see our other listings.

Technical Specifications

Dimensions per factory charts Dimensions.webp / Dimensions-2.webp; clamping per clamping-range chart.

Parameter Value
Chuck Diameter (D) 320 mm (12.60 in)
D1 (register / locating recess diameter) 265 mm
h (depth of D1 register recess) 7.5 mm
D2 (bolt circle diameter) 290 mm
D3 (through hole diameter) 100 mm
H (total thickness: body + jaws) 155 mm
H1 (body thickness only, excluding jaw height) 90 mm
H2 96 mm
Clamping (outside jaws, standard OD) 11.5 – 145 mm
Clamping (inside expand, same outside jaws) 95 – 320 mm
Clamping (outside with reverse jaws) 110 – 320 mm
Overall span (reference) 11.5 – 320 mm (0.45 – 12.60 in)
Mounting 3× M16
Repeatability ≤0.05 mm (0.002")
Net Weight 40.1 kg

Error-Free Jaw Installation

Jaws and body are numbered (1, 2, 3) so each jaw matches its slide—faster setup and better concentricity.

Versatile Applications

  • Metal lathe: Turning, facing, drilling, boring (with correct adapter).
  • Wood lathe: Where spindle and safety requirements allow.
  • Milling machine / machining center: On suitable arbors or fixtures.
  • Drilling machine: Concentric holding.
  • CNC: Production use where applicable.
  • Grinder: When speed-rated and safely mounted.

Compatibility Guide

Machine swing or envelope must clear the chuck body and fully opened jaws. Plan a comfortable margin above nominal diameter D. Your adapter must match D1, D2, and the bolt pattern listed above.

Maintenance

Clean regularly. Apply molybdenum disulfide (MoS2) grease to the scroll and bevel gears.

Safety

Never run with the chuck key engaged. Observe safe speeds for chuck size and workpiece balance.

Styled With
TOP-TOOL 3-Jaw Self-Centering Lathe Chuck 80mm
  • TOP-TOOL 3-Jaw Self-Centering Lathe Chuck 80mm
  • TOP-TOOL Professional 4-Jaw Self-Centering Lathe Chuck, 320mm / 12-Inch, Clamping Range 11.5–320 mm (0.45–12.60 in), Solid One-Piece Jaws, Outside Jaws Mounted + Inside Jaw Set, T-Key, Plain Back
  • TOP-TOOL Professional 4-Jaw Self-Centering Lathe Chuck, 320mm / 12-Inch, Clamping Range 11.5–320 mm (0.45–12.60 in), Solid One-Piece Jaws, Outside Jaws Mounted + Inside Jaw Set, T-Key, Plain Back
  • TOP-TOOL Professional 4-Jaw Self-Centering Lathe Chuck, 320mm / 12-Inch, Clamping Range 11.5–320 mm (0.45–12.60 in), Solid One-Piece Jaws, Outside Jaws Mounted + Inside Jaw Set, T-Key, Plain Back
  • T-Key Adjusting TOP-TOOL Lathe Chuck Jaws
  • TOP-TOOL Lathe Chuck Dimensions and Specifications (80mm, 2-63mm Range)
  • TOP-TOOL Professional 4-Jaw Self-Centering Lathe Chuck, 320mm / 12-Inch, Clamping Range 11.5–320 mm (0.45–12.60 in), Solid One-Piece Jaws, Outside Jaws Mounted + Inside Jaw Set, T-Key, Plain Back
  • TOP-TOOL Professional 4-Jaw Self-Centering Lathe Chuck, 320mm / 12-Inch, Clamping Range 11.5–320 mm (0.45–12.60 in), Solid One-Piece Jaws, Outside Jaws Mounted + Inside Jaw Set, T-Key, Plain Back
  • TOP-TOOL 3-Jaw Self-Centering Lathe Chuck 80mm
  • TOP-TOOL Professional 4-Jaw Self-Centering Lathe Chuck, 320mm / 12-Inch, Clamping Range 11.5–320 mm (0.45–12.60 in), Solid One-Piece Jaws, Outside Jaws Mounted + Inside Jaw Set, T-Key, Plain Back
  • TOP-TOOL Professional 4-Jaw Self-Centering Lathe Chuck, 320mm / 12-Inch, Clamping Range 11.5–320 mm (0.45–12.60 in), Solid One-Piece Jaws, Outside Jaws Mounted + Inside Jaw Set, T-Key, Plain Back
  • TOP-TOOL Professional 4-Jaw Self-Centering Lathe Chuck, 320mm / 12-Inch, Clamping Range 11.5–320 mm (0.45–12.60 in), Solid One-Piece Jaws, Outside Jaws Mounted + Inside Jaw Set, T-Key, Plain Back
  • T-Key Adjusting TOP-TOOL Lathe Chuck Jaws
  • TOP-TOOL Lathe Chuck Dimensions and Specifications (80mm, 2-63mm Range)
  • TOP-TOOL Professional 4-Jaw Self-Centering Lathe Chuck, 320mm / 12-Inch, Clamping Range 11.5–320 mm (0.45–12.60 in), Solid One-Piece Jaws, Outside Jaws Mounted + Inside Jaw Set, T-Key, Plain Back
  • TOP-TOOL Professional 4-Jaw Self-Centering Lathe Chuck, 320mm / 12-Inch, Clamping Range 11.5–320 mm (0.45–12.60 in), Solid One-Piece Jaws, Outside Jaws Mounted + Inside Jaw Set, T-Key, Plain Back
Materials

HT300 AISI1045 AISI 5140

Included Accessories

T-Key,Bolts ,External Jaws（One-piece Jaw Chuck）
Details

Backplate not included.

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