• Guardian 2 (G2) Safety Chuck

    G2 500 Pedestal Mount Safety Chuck

  • Guardian 2 (G2) Safety Chuck

    G2 Safety Chuck Handwheel

  • Guardian 2 (G2) Safety Chuck

    G2 Safety Chuck Journal Kit

  • Guardian 2 (G2) Safety Chuck

    G2 3000 Pedestal Mount Safety Chucks

Guardian 2 (G2) Safety Chuck

The newly designed G2 Guardian Safety Chucks feature longer service life, easier roll loading and lowest total cost of ownership in the industry. A new redesigned journal seat that is now fully replaceable not only reduces maintenance and increases service life but reduces overall costs.

  • Overview
  • Models & Drawings
  • Options
  • Documents

Replaceable Journals for Easier Maintenance 

  • Save Time – Hardened journal seats offer a longer service life, and if they become worn or damaged, they can be quickly and easily replaced with just a couple of tools in a matter of minutes without needing to remove the chuck itself.
  • Save Money – Replace only the journals. No longer a need to replace full handwheels when performing maintenance
  • Add Versatility – Journals can be swapped out to accommodate other shaft sizes.

Shorter Lead Times
Standard Sized Safety Chucks are available in 3-4 weeks. Non standard available in 5-6.

Redesigned Journal Seat
Shorter Lead Times, Reduced Downtime, Reduced Maintenance Costs, and Increased Versatility

Automatic Locking in Case of Accidental Rotation
Beyond +/-10° rotation from the vertical axis Guardian Safety Chucks begin to automatically lock, achieving full lock at 30° to ensure maximum safety from accidental shaft rotation.

Lowest Total Cost of Ownership
A longer service life combined with reduced maintenance costs give the Guardian Chucks the lowest total cost of ownership over the lifetime of a chuck.

Easier Roll Loading for Operators

Built to Suit Customizable Shaft Ends

Self Centering Journal Seats (A2 and A3)

Pedestal Mount or Flange Mount Available

Longer Service Life

Backwards Compatible to Our Original G and KL Safety Chucks

Rugged, Hardened Design
Guardian 2 (G2) Safety Chucks are designed to withstand the harshest environments and working conditions while never sacrificing safety or performance.

Superior Concentricity
Tightly held journal seat tolerances provide superior roll winding/unwinding concentricity.

For additional information on Guardian 2 (G2) Safety Chucks please download the Overview Brochure.

G2-500 Safety Chucks

For roll weights up to 1,124 lbs (5,000 N)

Chuck Capacity

Mount Max Roll Weight – lbs (N) Max Torque – in-lbs (Nm) Max Shaft Extension – in (mm) Max Shaft Diameter – in (mm) Drawings – Idler Side (A1-OW) Drawings – Drive Side (A1-BR) Price
Flange 1,124 (5,000) 1,151 (130) 2.75 (70) 1.18 (30) Idler Side – PDF Idler Side -DWG  Idler Side – STEP Drive Side – PDF Drive Side -DWG  Drive Side – STEP Price Request
Pedestal 1,124 (5,000) 1,151 (130) 2.75 (70) 1.18 (30) Idler Side – PDF Idler Side -DWG  Idler Side – STEP Drive Side – PDF Drive Side -DWG  Drive Side – STEP Price Request

Journal Dimensions

A1. Square – in (mm)
0.75 – 1.00 (19 – 25)

 

G2-1000 Safety Chucks

For roll weights up to 2,248 lbs (10,000 N)

Chuck Capacity

Mount Max Roll Weight* – lbs (N) Max Torque** – in-lbs (Nm) Max Shaft Extension – in (mm) Max Shaft Diameter – in (mm) Drawings – Idler Side (A1-OW) Drawings – Drive Side (A1-BR) Price
Flange 2,248 (10,000) 1,770 (200) 3.54 (90) 1.378 (35) Idler Side – PDF Idler Side -DWG  Idler Side – STEP Drive Side – PDF Drive Side -DWG  Drive Side – STEP Price Request
Pedestal 2,248 (10,000) 1,770 (200) 3.54 (90) 1.378 (35) Idler Side – PDF Idler Side -DWG  Idler Side – STEP Drive Side – PDF Drive Side -DWG  Drive Side – STEP Price Request

* Max. Roll Weight must be reduced for A2 (Diamond) Journal Seat by 25 to 30% depending on torque, speed and deflection of winding shaft. Consult a Montalvo Application Specialists for assistance.
** Max. Torque must be reduced for A2 (Diamond) Journal Seat by 40 to 50% depending on torque, speed and deflection of winding shaft. Consult a Montalvo Application Specialists for assistance.

Journal Dimensions

A1. Square – in (mm) A2. Diamond – in (mm)* A3. Triangle – in (mm)**
1.00 – 1.25 (20 – 30) 1.00 – 1.25 (20 – 30) 0.787 – 1.181 (20-30)

*See Chuck Capacity notes on Max Roll Weight and Max Torque for A2 journals
**Triangle Journal Dimensions (A3) are measured by creating a circle within the triangle and measuring the circles diameter.

 

G2-1800 Safety Chucks

For roll weights up to 4,047 lbs (18,000 N)

Chuck Capacity

Mount Max Roll Weight* – lbs (N) Max Torque** – in-lbs (Nm) Max Shaft Extension – in (mm) Max Shaft Diameter – in (mm) Drawings – Idler Side (A1-OW) Drawings – Drive Side (A1-BR) Price
Flange 4,047 (18,000) 3,363 (380) 3.94  (100) 1.96 (50) Idler Side – PDF Idler Side -DWG  Idler Side – STEP Drive Side – PDF Drive Side -DWG  Drive Side – STEP Price Request
Pedestal 4,047 (18,000) 3,363 (380) 3.94  (100) 1.96 (50) Idler Side – PDF Idler Side -DWG  Idler Side – STEP Drive Side – PDF Drive Side -DWG  Drive Side – STEP Price Request

* Max. Roll Weight must be reduced for A2 (Diamond) Journal Seat by 25 to 30% depending on torque, speed and deflection of winding shaft. Consult a Montalvo Application Specialists for assistance.
** Max. Torque must be reduced for A2 (Diamond) Journal Seat by 40 to 50% depending on torque, speed and deflection of winding shaft. Consult a Montalvo Application Specialists for assistance.

Journal Dimensions

A1. Square – in (mm) A2. Diamond – in (mm)* A3. Triangle – in (mm)**
1.25 – 1.50 (30 – 40) 1.25 – 1.50 (30 – 40) 1.26 – 1.496 (32 -38)

*See Chuck Capacity notes on Max Roll Weight and Max Torque for A2 journals
**Triangle Journal Dimensions (A3) are measured by creating a circle within the triangle and measuring the circles diameter.

 

G2-3000 Safety Chucks

For roll weights up to 6,744 lbs (30,000 N)

Chuck Capacity

Mount Max Roll Weight* – lbs (N) Max Torque** – in-lbs (Nm) Max Shaft Extension – in (mm) Max Shaft Diameter – in (mm) Drawings – Idler Side (A1-OW) Drawings – Drive Side (A1-BR) Price
Flange 6,744 (30,000) 10,621 (1,200) 5.51 (140) 2.55 (65) Idler Side -PDF Idler Side -DWG  Idler Side -STEP Drive Side -PDF Drive Side -DWG  Drive Side -STEP Price Request
Pedestal 6,744 (30,000) 10,621 (1,200) 5.51 (140) 2.55 (65) Idler Side -PDF Idler Side -DWG Idler Side -STEP Drive Side -PDF Drive Side -DWG Drive Side -STEP Price Request

* Max. Roll Weight must be reduced for A2 (Diamond) Journal Seat by 25 to 30% depending on torque, speed and deflection of winding shaft. Consult a Montalvo Application Specialists for assistance.
** Max. Torque must be reduced for A2 (Diamond) Journal Seat by 40 to 50% depending on torque, speed and deflection of winding shaft. Consult a Montalvo Application Specialists for assistance.

Journal Dimensions

A1. Square – in (mm) A2. Diamond – in (mm)* A3. Triangle – in (mm)**
1.50 – 2.00 (40 – 50) 1.50-2.00 (40 – 50) 1.575-1.850 (40 – 47)

*See Chuck Capacity notes on Max Roll Weight and Max Torque for A2 journals
**Triangle Journal Dimensions (A3) are measured by creating a circle within the triangle and measuring the circles diameter.

*the following are available options that can be added to your Guardian 2 Safety Chucks

Reversible Safety Lock
Prevents unintentional opening of the hand wheel and are field reversible to improve operator accessibility.

Axial Carrier
Maintains precise shaft positioning and axial adjustment.

Conical Chuck Journal Seat
Allows use of simple journals without the risk of excessive stress and wear. This is a cost effective alternative to machining journals with difficult and expensive undercuts.

Hand Wheel Open/Closed Position Indication
Indicates whether hand wheel is open or closed via an electronic sensor.

 

High Speed Safety Chuck
Handles web speeds in excess of 300 m (980 ft.) per minute. This is achieved by balancing the hand wheel (with safety lock) and shaft.

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