Page 1 - sb-applications
P. 1

The Solution To Bolting Problems

Application: Press Columns

Problem: Due to the nature of big presses, large
diameter columns must be used to distribute the
extremely high working loads generated. However,
the torque required to prestress these columns is
almost impossible to achieve with conventional
bolting methods.

3250 TON Mesta Forging Press. 18” Thrust Collar Style Traditionally, sledgehammers, overhead cranes,
Torquenuts® (No column threads) or stud heaters are used. These methods are
inaccurate, ineffective, time consuming and are
a safety hazard. Sufficient and accurate preload
is difficult to achieve on small presses and nearly
impossible on larger presses. If the columns are not
properly prestressed, fatigue fractures can occur.

Solution: Superbolt® Torquenuts® are designed as direct replacements
for the OEM nuts, and are being used by press OEM companies, press
repair shops, and end users. Only ordinary hand torque wrenches are
required to properly prestress any size press column.

The entire operation can be performed safely by a single man in a
fraction of the time it takes to use traditional tightening methods. The
Mesta Press shown above required less than 6 hours installation time
with only 1 man for all 8 nuts vs. 2-1/2 full days with additional personnel.

Removal is also a simple task. Torquenuts will not gall the main column 18” Superbolt® Torquenut® creates
thread during removal. Once the preload is relieved by loosening the 2,625,000 lbs. of pre-load with
jackbolts, the Torquenut easily spins off! only 275 ft•lbs of torque

Before: Pre-load = 2,625,000 lbs. After: Pre-load = 2,625,000 lbs.

Hex Nut Torque = 695,756 ft•lb Superbolt® Jackbolt Torque = 275 ft•lb

P.O. Box 683 • 1000 Gregg St. • Carnegie, PA 15106 •
1-800-345-BOLT (USA) • 1-412-279-1149 (International) • Fax: 412-279-1185 •
   1   2   3   4   5   6