Superbolt MJT standard range - Nord-Lock

Our engineers can solve your bolting challenges
Gas Compression
Applications include: Crosshead jamnuts, counterweight crosshead jamnuts, couplings, connecting rod nuts, distance pieces, end
plates, compressor cylinders, doghouse bolting, piston end nuts, valve jackbolts and more.
As seen on this reciprocating compressor
distance piece, our products can be retrofitted
in many limited space applications. High torque
requirements can now be achieved with small
hand held tools.
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Multi-jackbolt tensioners make the installation of
pistons easier. Only hand tools are required for
installation and removal, and the reliability of this
labyrinth-Piston compressor is greatly increased
over many years of usage.
Fiftytwo 2” (50,8 mm) tensioners on this centrifugal
compressor were tightened by two men in 2-1/2
hours. The old method required three men
working an eight hour shift.
Oil, Gas & Petrochemical
Applications include: Top drives, flame towers, blow out preventors, mud pumps, fracturing pumps, reactor covers, heat exchanger
heads, turbine control valves, turbine joints, pipe flanges, anchorbolts, couplings and more.
With a 2,500 horsepower rating, and 273,000
lb (1215 kN) rod load, this Weir SPM Destiny
Fracturing Pump utilizes Superbolt tensioners to
make bolting safer and easier in the field, as only
hand tools are needed.
A special multi-jackbolt tensioner series has been
developed for the unique needs of the Oil & Gas
industry. The washer is captive to the nut body
to prevent loss of the washer, and it features
corrosion protection to address the harsh
conditions. Used here on a riser clamp.
Large methanol reactor with 11” (279,4 mm)
studs. Six hours with Superbolt vs. two days with
Hydraulic Tensioners.
Mining
Applications include: Boom points, ring gears, side frames, hoist motors and pedestal tie-downs, draglines, pinion gears, hoist
and drag drums, split gears, bolted segments, excavator bearing caps and more.
The bolting challenges on this crusher included
limited space and extreme working conditions.
Multi-jackbolt tensioners proved to be the ideal
solution. Only 43 lb•ft (58 Nm) of torque on the
jackbolts was needed, the equivalent torque on
the standard bolt is 2,150 lb•ft (2915 Nm). The
use of a small 3/8”drive hand held torque wrench
was much safer and more accurate than previous
bolting methods.
Large power shovels have many critical bolting
applications. Multi-jackbolt tensioners are used
extensively on these machines, all over the world.
Seen above, MT tensioners on a ring gear.
On these hoist & drag drums, the high preload
of 428,400 lbf (1906 kN) was achieved with
only 233 lb•ft (316 Nm) of torque required on
each jackbolt. The added flex from the Superbolt
tensioners more than doubled the elasticity of the
bolted connection.