Modular Supports System Product Technical Guide June 2026

Modular Support Systems Technical Guide, Edition 2

3.0 Modular Support System

3.2.2 MT Base Connectors

MT-B-GXL S2 OC

Description

Base plate for fixation of MT-90 / MT 90H / MT-100 girder structures to 5.9”-9.7” steel flange widths. Slotted holes for spatial adjustments.

Material Specifications

Description	Standard 1	Grade 1	F y, ksi ( MPa)	F u, ksi ( MPa)
MT-B-GXL S2 OC	GB / T 1591	Q355 B	51.49 ( 355)	68.17 ( 470)
1 Mechanical properties of GB / T 1591 Grade Q355 B meet or exceed the
mechanical properties of ASTM A1011 SS Grade 50.

Corrosion Protection

Description	Environmental Conditions
MT-B-GXL S2 OC	Outdoor, low to moderate pollution( C3 / C4- low)

Ordering Information
Description	Weight Per Piece, lbs( kg)	Quantity Piece( s)	Item No.
MT-B-GXL S2 OC	20.72( 9.4)	2	2272107

mm( in)

Figure 28 – MT Girder Sandwiched to Steel

Table 158- Allowable Strength Design( ASD) Load Data 1, 2, 3, 4, 5

Fx Fy

Fz lb( kN) lb( kN) lb( kN) lb ft( kN m) lb ft( kN m) 13,895 3,345

3,345 4,270

4,985

( 61.75)( 14.9)( 14.9)

( 5.79)( 6.76)

1 Minimum safety factor, Ω, for tabulated values is 2.0. 2 Multiply tabulated values by 1.5 to obtain minimum Load and Resistance Factor Design( LRFD) values. 3 Tabulated values require that minimum grade 8.8 threaded rods must be used. 4 Tabulated values are for assembly shown in Figure 28. Design Professional is responsible for checking strength of supporting steel member. 5 Tabulated values are based on friction that is provided mechanically and not due to gravity loads.

Table 159- Limit State Design( LSD) Load Data 1, 2, 3, 4

My Mz

A. MT-90 / 90H / 100

Figure 29 – MT Girder Clamped to Steel

A. MT-90 / 90H / 100

Fx lb( kN)	Fy lb( kN)	Fz lb( kN)	My lb ft( kN m)	Mz lb ft( kN m)
20,810( 92.58)	5,035( 22.4)	5,035( 22.4)	6,290( 8.53)	7,470( 10.14)
1 Maximum resistance factor, φ, for tabulated values is 0.75.
2 Tabulated values require that minimum grade 8.8 threaded rods must be used.
3 Tabulated values are for assembly shown in Figure 28. Design Professional is responsible
for checking strength of supporting steel member.
4 Tabulated values are based on friction that is provided mechanically and not due to gravity loads.

Table 160- Allowable Strength Design( ASD) Load Data 1, 2, 3, 4

Fx Fy

lb( kN)	lb( kN)	lb( kN)	lb ft( kN m)	lb ft( kN m)
13,880	1,545	1,545	3,655	4,270
( 61.75)	( 6.88)	( 6.88)	( 4.96)	( 5.79)
1 Minimum safety factor, Ω, for tabulated values is 2.0.
2 Multiply tabulated values by 1.5 to obtain minimum LRFD values.
3 Tabulated values are for assembly shown in Figure 29. Design Professional is responsible for
checking strength of supporting steel member.
4 Tabulated values are based on friction that is provided mechanically and not due to gravity loads.
Table 161- Limit State Design( LSD) Load Data 1, 2, 3

Fx lb( kN)	Fy lb( kN)	Fz lb( kN)	My lb ft( kN m)	Mz lb ft( kN m)
20,810( 92.58)	2,315( 10.3)	2,315( 10.3)	5,485( 7.44)	6,405( 8.69)
1 Maximum resistance factor, φ, for tabulated values is 0.75.
2 Tabulated values are for assembly shown in Figure 29. Design Professional is responsible for
checking strength of supporting steel member.
3 Tabulated values are based on friction that is provided mechanically and not due to gravity loads.

Modular Supports System Product Technical Guide June 2026 | Page 91