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Email Enquiry |
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Contact Information
Phone:
(713) 649-5310
(800) 200-3047
Fax:
(713) 649-5305
Mailing Address
Marco Specialty Steel, Inc.
P.O. Box 590643
Houston, Texas 77259-0643
Physical Address
Marco Specialty Steel, Inc.
6633 Lindbergh
Houston, Texas 77087 |
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Stair Treads
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Manufactured to match the full line of our grating, there is a stair tread to meet your needs. Stair treads are safe, self-cleaning, skid-resistant and economical. Both steel and aluminum are available in a variety of styles: welded, riveted, press-locked, swage-locked and fiberglass.
Welded steel stair treads are the most widely used for their strength and ease of installation and are universally used in most industrial and commercial applications. Riveted steel stair treads have a greater load carrying capacity for the same span and depth of bearing bar and greater walking comfort. Both can be ordered with a serrated surface for additional safety.
Aluminum stair treads, due to their light weight, high strength, corrosion resistance, rust proof and non-sparking properties, are ideally suited for corrosive environments, food preparation and storage areas, and volatile areas. Swage-locked I-bar stair treads offer you high strength at less weight and lower cost. Rectangular bar, press-locked or swage-locked, stair treads provide a higher strength and stiffness-to-weight ratio and are available with a serrated surface when additional safety is required.
All stair treads are custom fabricated to meet the size, width and length specifications of a particular job. In addition, standard end plates can be custom fabricated to meet special bolt hole size or location requirements.
Both steel and aluminum nosings are available to add strength at the point of greatest impact and provide a definitive visible edge for extra safety. Choose our checkered plate nosing for normal use. For additional safety, choose our cast iron or aluminum abrasive nosings or our corrugated aluminum nosings |
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MOUNTING BOLT SPACING
19W Grating |
15W Grating |
Width |
"A" Dim. |
Width |
"A" Dim. |
6 3/16
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2 1/2
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6 1/8
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2 1/2
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7 3/8
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4 1/2
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7 1/16
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4 1/2
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8 9/16
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4 1/2
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8
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4 1/2
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9 3/4
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7
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8 15/16
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4 1/2
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10 15/16
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7
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9 7/8
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7
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12 1/8
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7
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10 13/16
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7
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Note: When using 1/8" thick bearing bar, tread width is 1/16"
TREAD WEIGHTS
| Tread Width |
3/4 x 3/16 |
1 x 3/16 |
1 1/4 x 3/16 |
| Weight |
Add for Additional Inch |
Weight |
Add for Additional Inch |
Weight |
Add for Additional Inch |
| 6 3/16 |
7.83 |
.34 |
9.03 |
.41 |
10.23 |
.48 |
| 7 3/8 |
8.97 |
.39 |
10.41 |
.47 |
11.85 |
.55 |
| 8 9/16 |
10.11 |
.43 |
11.79 |
.52 |
13.47 |
.62 |
| 9 3/4 |
11.25 |
.48 |
13.17 |
.59 |
15.09 |
.69 |
| 10 15/16 |
12.39 |
.53 |
14.55 |
.65 |
16.71 |
.76 |
| 12 1/8 |
13.53 |
.57 |
15.93 |
.71 |
18.33 |
.84 |
Based on 19W spacing of bearing bars and base length of tread 1' 6", for 1/8" thick bearing bars deduct 10% from above weights. For 15W spacing of bearing bars add 20%.
TREAD LENGTH
| Bearing Bar Size |
Max. Bar Size* |
| Plain |
Serrated |
| 3/4 x 3/16 |
2 - 4 |
- |
| 1 x 3/16 |
3 - 5 |
2 - 10 |
| 1 1/4 x 3/16 |
4 - 8 |
4 - 2 |
| 1 1/2 x 3/16 |
5 - 6 |
5 - 3 |
*Maximum tread length is based on a 300-lb. concentrated load on nosing and 4 bearing bars at center of tread length. For maximum length under other loadings, consult your Marco sales representative.
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