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4-Post Heavy Duty Filing - Adder Unit

MFR#: EXT3018865A
TIGER#: TM79082
Original price List Price: $1,542.00
You Save: $590.16 -38%
Original price $1,542.00 - Original price $1,542.00
Original price List Price: $1,542.00
Current price $951.84
$951.84 - $951.84
Current price $951.84
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4-Post Heavy Duty Filing - Adder Unit
4-Post Heavy Duty Filing - Adder Unit - $951.84
*Must Purchase 1 for 4-Post Heavy Duty Filing - Adder Unit

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Please call our Product Specialist to clarify your needs and if you may need more parts.

Dividers are required to complete your Filing Unit Order. Please make your choice HERE

Ships Out Within: 4-6 Weeks Shipping Date By: 7/30/2024
  • 5 Shelves with 1000 lbs Weight Capacity Each
  • 5 Width & 2 Design Options
  • 12 3/4" Between shelves
  • Compatible with Mayline Mobile Aisle 1000 and Mobile Lite
  • Easy to Assemble, no Hardware Required .

Mayline 4-Post Heavy Duty Filing - Adder Unit employs a unique modular design that brings your storage potential to an unlimited capacity. Start off with a basic unit and build up your storage system using Adder models. With Mayline 4-Post shelving adder systems you are free to create and alternate your storage space to fit folders, organize files, stock boxes and what not. Experience the benefits of a greater visibility, easier file retrieval, simple assembly and a large variety of upgrades.

Adder Model Features
Mayline 4-Post Heavy Duty Adder Unit features a closed "T" style upright and 5 shelves made of an 18-gauge steel that ensures exceptional durability and a weight capacity of as much as 1000 lbs per shelf. The Adder is available in single or double entry configurations at your choice allowing to accommodate just about anything including but not limited to banker’s boxes, pharmaceuticals, sporting goods and various tools. The clearance between shelves equals to 12 3/4" which is taller than standard and provides more storage options. This Starter 4-Post Heavy Duty Filing Unit can be mounted on Mayline Mobile Aisle 1000 and Mobile Lite for enhanced storage density! The unit construction allows easy assembly with no hardware required.

Please note: Dividers are not included with this product, but are required when using standard common stops. When used, Dividers can be adjusted on 3" centers along the shelf. To purchase the Dividers or any other optional accessories, please see the Related Products tab above.

4-Post Heavy Duty Filing- Adder Unit - Shelving Options Chart
Item # Width Design Depth List Price Price
EXT3018865A 30" Single Entry 18" $911 $523,72
EXT2418865A 24" $938 $537,76
EXT4218865A 42" $951 $544,52
EXT3618865A 36" $956 $547,12
EXT4818865A 48" $978 $558,56
EXT2436865A 24" Double Entry 36" $1 422 $789,44
EXT3036865A 30" $1 435 $796,20
EXT3636865A 36" $1 452 $805,04
EXT4236865A 42" $1 457 $807,64
EXT4836865A 48" $1 492 $825,84

Customize Your 4-Post Heavy Duty Filing - Adder Unit

For Heavy Duty Adder models Mayline allows several customizible options to best suit your storage requirements.
Width Options
5 width options are provided to match any of your storage requirements.

  • 24" Width
  • 30" Width
  • 36" Width
  • 42" Width
  • 48" Width

Design Options
The two design options include Single and Double entry variations. Both offer a generous storage capacity allowing to accommodate various media and goods.

  • Single Entry - 18" Depth
  • Double entry - 36" Depth

Color Options
Mayline offers a choice of 17 finish colors.

To placed an order, please select from the drop down menu above

Warning WARNING: This product can expose you to chemicals known to the State of California to cause cancer. For more information, go to

  • 5 Shelves with 1000 lbs Weight Capacity Each
  • 5 Width & 2 Design Options
  • 12 3/4" Between shelves
  • Compatible with Mayline Mobile Aisle 1000 and Mobile Lite
  • Easy to Assemble, no Hardware Required

What’s in the Box

  • 1 Closed "T" Upright
  • 5 Shelves
  • 5 Common Stops
  • 1 Canopy Top
  • 12 Shelf Supports
  • Shelf Reinforcements as Required
  • Limited Lifetime Warranty

2 year warranty


We can not accept returns for this item, as is our policy for all parts replacements. We take the responsibility to make sure this product arrives in brand new working condition. Should your item arrive damaged, we will take full responsibility and replace the product at no cost to you. For complete details of our return policy and process, please refer to our general return policy page.

File Size Compatibility
Letter, Legel, Other
Filing Capacity (LFI)
22 5/8", 28 5/8", 34 5/8", 40 5/8", 46 5/8"
Number of Shelves
Construction & Features
Assembly Required?
Dividers Adjustable?
Dividers Per Shelf
Track System Compatible?
Country of Origin
Product made in:
Dimensions & Weight
18", 36"
Product Weight
143 lbs
24", 30", 36", 42", 48"
see color options
Shelf Material
Unit Material
Limited Lifetime Warranty
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