MSB Flintec
26 November 2014
Torque values and fixing selection
Torque values can vary significantly depending upon the lubrication of threads. The following values are based on new,
clean threads in 'as received condition' without additional lubrication. Flintec recommends the use of a thread lubricant, such
as Locktite 767 or equivalent to prevent the seizing of threads over a long period of time. These torque values can be used
for bolts with this lubricant without over-stressing bolts. All frame bolts are to be ISO/DIN 961 grade 10.9 (or SAE Grade 8),
all lock nuts Grade C. Use new fixings at all times. For load cell top and end bolts where loads are likely to reach 100% of its
rated capacity and in high dynamic applications such as agricultural axles use grade 12.9, (SAE grade 9) use grade 10.9
(SAE grade 8) for all other applications. A minimum of 14 turns or 28 mm (1-1/8") thread engagement is recommended.
Flexible Mounts -
Where solid rubber and/or polyurethane blocks are fitted, ensure 28 mm (1-1/8") min for 15 t
cells and 22 (7/8") mm min for 7.5 t. of thread engagement into load cells and that anti-rotation devices such as tab
washers or Nordlock washers are used.
Application
Fastener size
Grade
Tightening torque
Frame mount brackets
7.5 t (16500 Lbs)
3/8" 16 TPI UNF
SAE 8
37-44 Ft Lbs
M12-1.75 (standard)
8.8
90-110
M12-1.75 (standard)
10.9
100-120 (Recommended)
Frame mount brackets
15 t (33000 Lbs)
5/8" 11 TPI UNF
SAE 8
180-212 Ft Lbs
M16-2 (standard)
8.8
200-215 Nm
M16-2 (standard)
10.9
285-305 Nm (Recommended)
DSB7 7.5 t (16500 Lbs)
Top and end bots
M16-1.5 (fine)
10.9
300-315 Nm (Recommended)
M16-1.5 (fine)
12.9
350-380 Nm (High & dynamic loads)
DSB7 15 t (33000 Lbs)
Top and end bolts
M24-2 (fine)
10.9
1000-1100 Nm (Recommended)
M24-2 (fine)
12.9
1200-1300 Nm (High & dynamic loads)
12
Socket Head Cap Screw
Full thread from end to bolt head.
Suitable for the end and top fixings.
Washers not normally needed.
Allows the head to be recessed into the bracketry.
Hexagon Head Screw
Full thread from end to bolt head.
Use wasehers.
Suitable for the end and top fixings.
Suitable for frame mount fixings.
Hexagon Head Bolt
Straight shank- part thread from end to bolt head.
Use wasehers.
Strongest fixing.
Suitable for the end and top fixings.
Suitable for frame mount fixings.
Flat Countersunk Socket Cap Screw
Full thread from end to bolt head.
Suitable for the end and top fixings where loads are low to
moderate such as a weigh platform.
Washers not normally needed.
Suitable for frame mount fixings where cosmetics and available
space is tight.
Ideal where a top plate need to be flush fitting
The fixings into the DSB7 load cell are metric only: M16-1.5 (fine) and M24-2 (fine) metric fixings to ISO/DIN 961 are
widely available in various lengths, check with the Flintec sales teams for availability of stocked fixings.
Fixings -
There are many applications for the DSB7 on a wide variety of trucks and machines. Mounting styles, bracket
design and choice of fixings are too numerous to cover every possibility in this document. The following fixing types
gives installers a choice of techniques and choice of fixings for a given application. Factors such as applied forces,
available space, fixing availability and cosmetics all contribute to the choice of fixing. Thread rolled bolts are the
prefered choice in most cases. Fixing lengths depend on thickness of bracket plates deployed.
Example fixing styles
