Airport Castings: Spring Assist Hatches

Neenah Foundry offers a variety of cast iron spring assist hatches for use in airport settings. Select from the list below to find the airport manhole frames and grates that fit your needs.

R-3498 Gray Iron Frames with Ductile Iron Lids+

R-3498

Gray Iron Frames with Ductile Iron Lids – Proof Load Tested to 200,000#
Patent #7216459

Catalog Number Grate Type Square Feet Open Weir Perimeter Lineal Feet
R-3498-K2GS A or C 1.5 8.6
R-3498-P2GS A or C 2.1 10.5
R-3498-R2GS A or C 3.0 12.8
R-3498-R3GS A 6.0 19.0

R-3498

Castings strong enough to handle severe loads are inherently heavy. Lifting these heavy lids/gates to gain access to sub-ground utilities has been an issue for maintenance crews. Lifting these heavy covers requires multiple personnel and lifting equipment. With Neenah's Spring-Assist Hatches, a single maintenance worker can quickly open the lid, and secure it in the upright position with Neenah's hold open device and perform the necassary work.

Catalog No.
Solid Lid
Catalog No.
Open Grate
A B C D E Lid Weight
Square
R-3498-K2 R-3498-K2G 25-3/4 x 25-3/4 1-1/2 24 x 24 30 x 30 4 230#
R-3498-P2 R-3498-P2G 31-1/2 x 31-1/2 1-1/2 30 x 30 36 x 36 4 364#
R-3498-R2 38 x 38 1-1/2 36 x 36 42 x 42 4 428#
Rectangular
R-3498-R3* 76-9/16 x 38-3/8 1-1/2 74-3/16 x 36 80-3/16 x 42 4 856#

Spring Assist Hatches

Catalog No.
Solid Lid
Catalog No.
Open Grate
A B C D E Lid Weight
* 2-piece cover ** with support bar
Square
R-3498-K2S R-3498-K2GS 25-3/4 x 25-3/4 1-1/2 24 x 24 30 x 30 4 251#
R-3498-P2S R-3498-P2GS 32 x 32 1-1/2 30 x 30 36 x 36 4 358#
R-3498-R2S R-3498-R2GS 38 x 38 1-1/2 36 x 36 42 x 42 4 471#
R-3498-T2S* 50 x 50 1-1/2 48 x 48 56 x 56 4 571#*
Rectangular
R-3498-J3S 25-7/8 x 37-7/8 1-1/2 36 x 24 42 x 30 4 340#
R-3498-R3S* ** R-3498-R3GS* ** 76-9/16 x 38-3/8 1-1/2 74-3/16 x 36 80-3/16 x 42 4 471#

FEATURES UNIQUE to the NEENAH R-3498 SERIES

  • Lid mounted springs move out of the free open area, exposing the free opening.
  • Spring position allows more spring rotation, thus more spring power.
  • Slam-latch enables opening and closing with ease. Simply pop the lid open and slam it shut.
  • Self-contained frame, lid and spring assembly pushes on itself, not external wall structures.
  • Easy spring removal and replacement
  • Neenah's Perma-Grip non-skid surface.

Optional threaded hole in frame for Grounding Strap – specify if required.

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