3MSlotted Expander Drums for Spiral Bands

3M Slotted Expanding Drum: 2 in Dia x 1 in W

The 3M Slotted Expanding Drum (MPN 77720) is a slotted expander drum for spiral bands, featuring a 2 in diameter, 1 in width, and a 1/4 in straight-shank. This OEM 3M product is designed for use with compatible…

SKU 3G-OTH-531812

Brand

Item

Slotted Expanding Drum: 2 in Dia x 1 in W

Technical Specifications

Manufacturer Part Number

77720

Product Type

Expander Drum 

Expanding Type

Slotted 

Straight-Shank

1/4 in 

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Technical Documents

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3M Products

3G Electric (S) Pte. Ltd. — Singapore

Product Description

Frequently Asked Questions

What is the 3M Slotted Expanding Drum 77720 used for?

The 3M Slotted Expanding Drum 77720 is used in industrial finishing to mount spiral abrasive bands for deburring, blending, and surface conditioning on metal, wood, and composites. It is compatible with 3M spiral bands and fits a 1/4 in straight-shank rotary tool.

What are the specifications of the 3M 77720 expanding drum?

The 3M 77720 is a slotted expander drum with a 2 in diameter, 1 in width, and a 1/4 in straight-shank. It is an OEM 3M product designed for spiral bands. The slotted expanding type ensures secure band retention during high-speed finishing operations.

Where to buy the 3M 77720 slotted expanding drum worldwide?

3G Electric supplies the 3M 77720 slotted expanding drum worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver this OEM 3M product to your facility. Contact us for availability and lead time.

How to install a spiral band on the 3M 77720 expanding drum?

To install a spiral band on the 3M 77720 expanding drum, slide the band over the drum body, then use a slotted expanding tool to evenly expand the drum slots against the band's inner surface. Ensure the band is centered and tensioned uniformly before operating at recommended speeds.

Used in

Common applications for 3M

Industrial process water filtration — 3M solid polypropylene cartridge (e.g., RT10Q16G20NN, 7 micron) for sediment removal in manufacturing lines.

Cooling tower pre-treatment — 3M string-wound cartridge (e.g., RT39B16G20NN, 30 micron) to protect heat exchangers from particulate fouling.

Food and beverage rinse water — 3M 1 micron solid cartridge (RT10Y16G20NN) for fine filtration to meet quality standards.

Chemical processing feed water — 3M 27 micron solid cartridge (RT30L16G20NN) for high-flow sediment reduction upstream of sensitive equipment.

Wastewater effluent polishing — 3M 2 micron string-wound cartridge (RT09Y16G20NN) for final particulate removal before discharge or reuse.

Pharmaceutical utility water — 3M 0 micron string-wound cartridge (RT09L16G20NN) for sub-micron filtration in critical systems.

3M Products

3G Electric supplies 3M slotted expander drums for spiral bands. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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