Installation Typicals - Fastening on Steel Threaded Studs

Application
• Fastening of junction boxes, switches on a vertical structure
• Element is fastened by X-BT-MF
Boundary conditions
• These values are ONLY reflecting capacity of X-BT-MF threaded stud.
Structural analysis of support / structure is NOT in Hilti scope. See the detailed
statements in disclaimer — 2018/05/04
• Technical data are based on technical data binder for X-BT-MF (06 / 2018),
always refer to latest technical data binder for X-BT-MF
V–N (shear
and tension)
V
V
rec
V
V
rec
N
N
rec
N
N
rec
+
with and
1.2
1.0 1.0
≤
≤ ≤
V–M (shear
and bending)
V
V
rec
V
V
rec
M
M
rec
M
M
rec
+
with and
1.2
1.0 1.0
≤
≤ ≤
V–N–M (shear, tension
and bending)
V
V
rec
N
N
rec
M
M
rec
+ + 1.0≤
N–M (tension
and bending)
N
N
rec
M
M
rec
+ 1.0≤
Conditions for recommended loads
• Use with Hilti glass-fiber reinforced polyamide material nuts, M10 and W10
( as per according to General Information — Material specifications)
• Not to be used with any additional washer which provide an axial force when
deformed, e.g. spring or lock washer, etc.
• Global factor of safety > 3 (based on 5% fractile value)
• Minimum edge distance = 6 mm (1/4")
• Effect of base metal vibration and stress considered
• Redundancy (multiple fastening) must be provided
• Recommended loads in the table refer to the resistance of the individual
fastening and may not be the same as the loads FN and FV acting on the
fastened part
Note: if relevant, prying forces need to be considered in design, see
example. Moment acting on fastener shank only in case of a gap between
base and fastened material.
• Minimum temperature for installation and adjustments = -10 °C
Design resistance X-BT-MF
Drill hole type and base material thickness Pilot hole, t
II
≥ 8 mm (0.31")
Base material
Steel R
m
≥ 350 MPa
Service Temp. -40 °C to 60 °C
Steel R
m
≥ 350 MPa
Service Temp. 60 °C to 100 °C
Tension, N
Rd
[kN / lb]
2.0 / 450 1.35 / 300
Shear, V
Rd
[kN / lb]
3.0 / 675 1.9 / 425
Moment, M
Rd
[Nm / ft-lb]
18.4 / 13.6 18.4 / 13.6
Recommended load X-BT-MF
Drill hole type and base material thickness Pilot hole, t
II
≥ 8 mm (0.31")
Base material
Steel R
m
≥ 350 MPa
Service Temp. -40 °C to 60 °C
Steel Rm ≥ 350 MPa
Service Temp. 60 °C to 100 °C
Tension, N
rec
[kN / lb]
1.5 / 340 1.0 / 225
Shear, V
rec
[kN / lb]
2.2 / 500 1.4 / 315
Moment, M
rec
[Nm / ft-lb]
8.2 / 6.0 8.2 / 6.0
Technical data — always refer to latest technical data binder for X-BT-MF
FASTENING JUNCTION BOXES / SWITCHES
WITH X-BT-MF
X-BT-MF Threaded stud
X-BT-MF • Imperial
Recommended interaction formula for combined loading
Combined
loading situation Interaction formula
F
V
F
N
Z
1
Z
2
Z
3
108Issued August 2018, expiry January 2022