Bolt-together Models 03/04

Our bolt-together models 03AA and 04AA are designed to meet IBC and ADA codes for the following applications:

  • Commercial egress stairs
  • Industrial secondary access stairs
  • Accessible commercial egress stairs
  • Commercial residential egress stairs

Because Models 03AA and 04AA stairs are completely pre-engineered steel stair systems with bolt-together assembly, they are best suited for the following:

  • Renovations or retrofits to existing buildings where assembly space is limited
  • Self-installations where certified welders are not available or required
  • Exterior or free-standing stair towers

Advantages of Bolt-together Stair Systems

Our bolt-together systems are the simplest and most cost-effective stair solutions available.

  • Because the engineering and design capabilities are built into our computer system, we can provide you with pricing and project drawings within minutes over the phone.
  • Bolt-together stairs can be shipped completely unassembled, greatly reducing shipping costs compared to welded stair systems.
  • Bolt-together stairs require no welding or expensive installation equipment and can be assembled within compact spaces.

Consult this table to determine if this is the right stair for your application.


Rail Options

Our stairs come with both guardrails and handrails designed within the parameters of the building codes and field conditions you need to meet. The guardrails are 42 inches, and the handrails are 30-38 inches, depending on your code and preference.You may opt to have guardrails on both sides, or if you are mounting the stair against a wall, opt to have no guardrail. The top edge of the stringer is narrower if you do not have a guardrail. If you choose no guardrail, you can select a handrail that will attach to the wall using wall mount brackets. Or you may leave off the rails and provide your own wall mounted rails if you wish.

Stairs that must comply with ADA guidelines will have an extension.

The Industrial IBC stair is the only industrial stair that requires the inside handrail in addition to a guardrail. For this reason, we suggest using Model 03AA or Model 04AA when you must comply with IBC for industrial access stairs.

The balusters of the guardrail connect through the stringer of the stair, and bolt in place using provided spacers and bolts.



Handrail End Terminations

  • Your customer service representative will automatically assume that you want guardrails on both sides of the stair
  • If your stair is against a wall, you can choose to eliminate the guardrail. Stairs without guardrails have a narrower stringer so that users, especially children, cannot slide down the edge of the stringer.
  • Guardrails extend 42" above the nosing of the tread and end at the top and bottom of the stair.
  • Commercial stairs have balusters that are spaced so that a 4" sphere cannot pass between.
  • Stairs ordered under the IBC Industrial Code have balusters spaced so that a 21" sphere can not pass between two balusters.
  • Guardrails are also available with a Filler Panel option.
Balusters
  • Your customer service representative will automatically assume that you want guardrails on both sides of the stair
  • If your stair is against a wall, you can choose to eliminate the guardrail. Stairs without guardrails have a narrower stringer so that users, especially children, cannot slide down the edge of the stringer.
  • Guardrails extend 42" above the nosing of the tread and end at the top and bottom of the stair.
  • Filler panels are painted with the finish you desire, either the same as your stair or a different color.
  • Guardrails are available with full balusters.
Filler Panels


  • Top and bottom extensions on rail meet ADA requirements as outlined in ADA 4.9.4(2).
  • Handrail connects to the guard rail or the wall.
  • Baluster ends press punched.
  • Rails capable of withstanding a 200 pound load applied in any direction.
  • Rail and balusters constructed from 1-1/2" OD tube.
  • Balusters attach to stringers using provided bolts and spacers.

Top Handrail

Extended Box to Guard Handrail Top

Bottom Handrail

Extended Box to Guard Handrail Bottom

View sample prints

  • Baluster ends press punched.
  • Rail end caps molded from low density polyethylene. Optional Steel cap available
  • Rails capable of withstanding a 200 pound load applied in any direction.
  • Rail and balusters constructed from 1-1/2" OD tube.
  • Balusters attach to stringers using provided bolts and spacers.
  • Meets IBC code requirements, but not ADA. Can not be used for an accessible stair.

Top Handrail

Extended Box to Guard Handrail Top

Bottom Handrail

Box to Guard Handrail

View sample prints

  • Top and bottom extensions on rail meet ADA requirements as outlined in ADA 4.9.4(2) for accessible stairs.
  • Handrail mounts directly to your wall with wall brackets that we provide. Our system calculates the default number of brackets to meet code requirements, but we can include additional brackets at your request. Please let your customer service know if you need additional brackets at the time of quoting.
  • 1½" clearance between handrail and wall.

Top Handrail

Wall Mount to Handrail Top

Bottom Handrail

Extended Wall Mount to Wall

View sample prints

  • Meets IBC code requirements, but not ADA. Cannot be used for an accessible stair.
  • Handrail mounts directly to your wall with wall brackets that we provide. Our system calculates the default number of brackets to meet code requirements, but we can include additional brackets at your request. Please let your customer service know if you need additional brackets at the time of quoting.
  • 1½" clearance between handrail and wall.

Top Handrail

Wall Mount to Handrail Top

Bottom Handrail

Wall Mount to Handrail

View sample prints



Tread Options

The diamond plate tread provides a solid tread surface with raised diamonds for a non-skid surface. We manufacture these treads in our facility and are able to accommodate custom width requests.

Table 3: Diamond Treadplate Tread Details
Material Carbon Steel
Stair Finishes Choice of 5 Finishes
Widths 36” *, 44”, 48”, and Custom Widths
Widths based on Height See Chart
* Available for some stairs as allowed by building code. IBC 2000 section 1003.3.3.1 Exception 1 "Stairways serving an occupant load of 50 or less shall have a width of not less than 36".
Diamond Tread Front View  Diamond Tread Top View

If your application requires concrete treads, you may select concrete pan treads manufactured here in our facility. We use the underside of the diamond tread plate to create the pan, with the diamond plate wrapped around the front edge to create a diamond tread plate nosing. The pan treads are available in the same widths as our other treads, or you may choose a custom width. The pans are provided ready to install and ready for your site poured concrete.

Table 5: Concrete Pan Details
Material Carbon Steel
Stair Finishes Choice of 5 Finishes
Widths 24”, 30”, 36”, 48”, and Custom Widths
Depths 9-3/4”, 10-15/16”, and 12-1/8”
Sample Prints View Pdf
Widths based on Height See Chart
Concrete Pan side  Concrete Pan Tread Front

The smooth plate tread is identical to the Diamond tread, except that it does not have the raised diamonds. This surface should not be used alone and is designed to allow you to adhere your own surface material directly to the stair (carpeting, non-slip flooring surface, or other flooring material). We manufacture these treads in our facility and are able to accommodate custom width requests.

Table 3: Smooth Treadplate Tread Details
Material Carbon Steel
Stair Finishes Choice of 5 Finishes
Widths 36” *, 44”, 48”, and Custom Widths
Widths based on Height See Chart
* Available for some stairs as allowed by building code. IBC 2000 section 1003.3.3.1 Exception 1 "Stairways serving an occupant load of 50 or less shall have a width of not less than 36".
Smooth TreadPlate


Stair Finishes

  • Safety yellow powder coat
  • Iron gray powder coat
  • Gray primer powder coat
  • Hot dip galvanized
  • Choice of 180 colors powder coat

Dimensions

Table 2: 03AA/04AA Stair Dimensions
Configuration Minimum* Maximum
Stair Height 18" 144"
Stair Angle(up to 10'3) see charts below
Riser Height 5" 7"
Projected Tread Depth (Tread Run) 10" 11.5"
Top landing Depth 4"
Top Reveal 1" 1.5"
Front Reveal .25" 1.5"
Guardrail Height 42"
Handrail Height 30" 38"
Baluster Spacing 3.75" 21"
Tread Width (Inside Stair Width) 36" 60"
* Varies by Building Code. Your minimum/maximum requirements may vary.


Available Stair Angle and Height Charts

The minimum height, maximum height, and angle restriction ranges for our closed riser stairs vary based on the stair width and the type of tread. The two charts below provide guidelines based on height. You may also contact our customer service department with your requested height and width, and we will provide you with the information you need.

To read the table, the heights and angles are available for all heights (in feet) below and to the right of the colored line that represents each tread width. For example, a 36" wide tread is available up to 12' high at approximately the 25 degree angle and steeper, but not at a 21 degree angle, which has a height limitation of just over 10' high. For specific heights/angles, please consult your customer service representative.

Model 03AA/04AA Steel Tread Stair Heights (ft.)
Model 03AA/04AA Concrete Pan Stair Heights (ft.)



*Building Codes

Both Stair Models 03AA and 04AA are designed around the following building codes.

  • IBC / International Building Code
  • ADA / American Disabilities Act

*Check back frequently for updates and new code additions