TOP-TOOL Professional 3-Jaw Self-Centering Lathe Chuck, 800mm / 32-Inch, Clamping Range 120–800 mm (4.72–31.50 in), Two-Piece Jaws (Master + Reversible Top Jaws), Pre-Mounted Set, T-Key, Plain Back

$999.99 CAD

TOP-TOOL Professional 3-Jaw Self-Centering Lathe Chuck, 800mm / 32-Inch, Clamping Range 120–800 mm (4.72–31.50 in), Two-Piece Jaws (Master + Reversible Top Jaws), Pre-Mounted Set, T-Key, Plain Back

TOP-TOOL Professional 3-Jaw Self-Centering Lathe Chuck, 800mm / 32-Inch, Clamping Range 120–800 mm (4.72–31.50 in), Two-Piece Jaws (Master + Reversible Top Jaws), Pre-Mounted Set, T-Key, Plain Back

Name: TOP-TOOL Professional 3-Jaw Self-Centering Lathe Chuck, 800mm / 32-Inch, Clamping Range 120–800 mm (4.72–31.50 in), Two-Piece Jaws (Master + Reversible Top Jaws), Pre-Mounted Set, T-Key, Plain Back
Brand: TOP-TOOL
Price: 999.99 CAD
Availability: InStock

$999.99 CAD

Professional 800mm / 31.50-Inch 3-Jaw Self-Centering Lathe Chuck (Two-Piece Jaws (Master + Reversible Top 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 800 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 120–800 mm (4.72–31.50 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): 120–450 mm gripping on the outside diameter.

Inside support / expanding with the same outside jaws: 300–800 mm internal gripping (boring-style holding).

Outside clamping with solid inside (reverse) jaws: 300–800 mm for large-diameter OD work.

Summary: overall envelope 120–800 mm (4.72–31.50 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 = 710 mm locating register, recess depth h = 8 mm; D2 = 760 mm bolt circle; 6× M20 mounting holes. Machine your adapter to match D1/D2. Adapter plate not included.
Two-Piece Jaw System: Master jaws with reversible top jaws pre-mounted—configure for OD or ID work per the jaw instructions. No second full jaw kit is included in the box (not the same packaging as solid-jaw models).
T-Key Included.

Jaw type

This listing uses two-piece jaws (master jaws + top jaws). For solid outside/inside jaw sets, 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)	800 mm (31.50 in)
D1 (register / locating recess diameter)	710 mm
h (depth of D1 register recess)	8 mm
D2 (bolt circle diameter)	760 mm
D3 (through hole diameter)	385 mm
H (total thickness: body + jaws)	247 mm
H1 (body thickness only, excluding jaw height)	149 mm
H2	157 mm
Clamping (outside jaws, standard OD)	120 – 450 mm
Clamping (inside expand, same outside jaws)	300 – 800 mm
Clamping (outside with reverse jaws)	300 – 800 mm
Overall span (reference)	120 – 800 mm (4.72 – 31.50 in)
Mounting	6× M20
Repeatability	≤0.05 mm (0.002")
Net Weight	305.0 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.