Hardlock Fasteners distributed by Australian Mining Products and services 2021

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Fasteners




inspired by a traditional gateway at a Shinto shrine in Osaka nearly 40
years ago, the self-locking Hard Lock Nut has become an international
success, offering improved safety and reduced costs by producing a nut
that never comes loose.

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Applying the Wedge Principle with Two


The idea behind the Hard Lock
Nut is simple: it uses the wedge
principle to lock the nut into
place. Hammering a wedge be-

tween the nut and bolt is enough
to prevent loosening. But this is
not realistic in the real world,
since it would require workers to drive in a wedge every time
they screwed a nut and bolt together.


The solution was a similar wedge-like effect using

nuts alone. The solution he came up with was to use
two differently shaped nuts for each bolt: one con-
cave, the other convex. The concave nut (the upper

nut) has a perfectly spherical concavity, but the con-

vex nut (the lower nut) has a small eccentricity, with a
thin wedge on one side and a thick wedge on the oth-
er. When the concave nut is tightened over the convex

nut, the effect produced is the same as driving in a
wedge with a hammer.

The proven solution in threaded joints


Hardlock Nut was invented in the 1970’s, with the establishment of HARDLOCK
Industry Co., Ltd in 1974. As a receiver of many awards and establishing a
reputation in the railway industry for its renown self-lock ability, Hardlock
Products spread all over Japan to industries such as Manufacturing,
Construction, Aerospace and Mining... Hardlock has always took a moment to
reflect back on itself, improve Quality and maintain good customer relationships.
Hardlocks main objective is not to provide a good self-lock nut, but to provide a
product that will become the backing of society, a product that creates trust. The
hope to create a new culture based not on maintenance improvement but on
Equipment Design Improvement.

In 2012, Mining Company Vale started communications with Hardlock Brazil.
This led to trial testing of Hardlock Nut in the hopes that unplanned
maintenance could be reduced. At the current time, Weekly Maintenance of
Exciters and Motovibrators required the use of cranes to first remove the
housing and then finally check the nuts and bolts for signs of breakage/
loosening. After undergoing tests, In 2013 Hardlock Nut was recognized as the
ideal product to be used in Caue’s South Area Vibration Screens. The screen
manufacturer, Haver has also taken the initiative to install Hardlock Nut into the
Vibration Screens on assembly. Korean Screen Manufacturer ‘Mining
Machinery’ the first company to kick off Korea Sand Mining is another example
where HARDLOCK Nut was employed. Due to the previous problems with
breakage and loosening, Mining Machinery saw a huge improvement to Client
Satisfaction and Trust.

Vibration Screens Failure Mode Analysis:
70% of all Equipment Loss
1. Conveyors 70% of Screen Part Failures
2. Screens

3. Pumps 1. Vibration Motors
2. Main Motors 70% of Failure Modes
3. Screen Panels
4. Channels 1. Bolt Loosening / Failure
5. Exciters 2. Motor Burn Out
6. Cross Beams 3. Damaged Components
7. Cardan Shafts


※ According to Vale Caue’s loss profile analysis.
Problems related to loosening:
◆ Motor burn outs
◆ Exciter and Vibration Motor Bolt Failures
and Loosening
◆ Weekly Retorquing bolts for screen deck
◆ Weekly Retorquing bolts for Rubber Spring
◆ Monthly checks to check for cracking across
cross beams
Re-alignment of Cardan Shaft

Where are Hardlock Products used?

All of the above!
With the benefit of the following:
◆ Housing Securing Bolts Easier Removal and reinstallation
◆ Screen Panel Bolts.

The proven solution in threaded joints


Who should consider using Hardlock Products?
◆Ideal for companies looking to reduce unscheduled maintenance and
increase MTBF (Mean time between failures).
◆Reduce re-stocking and management of expendables while also reducing
cost.
◆ Looking for a low maintenance solution.
◆Searching for a fully tested reliable product, with focus on Quality and
customer satisfaction.

Why use Hardlock Products?
◆ Eliminating Fatigue Failure (Breakage)
◆No unplanned maintenance (+ extended preventative
maintenance)
◆ No special tooling
Hardlock Nut Huck Bolt
No Special tools necessary ( installation / removal ) ✔
Re-usage of nuts and bolts ✔
Rotational loosening prevention ✔ ✔

What’s the guarantee it won’t loosen?
Hardlock undergoes special testing to ensure that there are no problems on
installation. For example, to check nuts for self-locking ability:
◆ National Aerospace Standard – Vibration Test (NAS 3354)
◆ Junker Vibration Tests (ISO 16130)

The Junker Test Results and Assembly can be seen as below:
Junker Test Results – M12 Junker Test Assembly

Test Nut
Clamping force [kN] Glider Plate



Fixed Plate


Load Cell


Number of repeated cycles

Hardlock Products




Hardlock Nut Hardlock Nut Hardlock Hardlock Set
Basic Rim Bearing Nut Screw
(HLN-B) (HLN-R) (HLB) (HLS)
Visit Hardlocks main website for catalogues, and other technical details
https://www.hardlock.co.jp/en/products/
Please contact: [email protected] for further details.

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The HARDLOCK Nut is a two-piece locking
nut that is in use across many industries. By
using the HARDLOCK Nut, engineers can be
safe in the knowledge they are protecting ex-

pensive machinery and structures from the
effects of vibrations loosening in threaded
joints.




They can also reduce subsequent maintenance and inspection
costs. And unlike the majority of locking nuts available, the HARD-
LOCK Nut is reusable.




The HARDLOCK Bearing Nut is a lock-

nut for roller bearing use developed by
HARDLOCK Industry based on the

same wedge effect principle utilized in
the HARDLOCK Nut. Without making

any modifications to the specifications
of the machines or structures in which it used, the HARDLOCK

Bearing Nut provides a strong self-locking performance even un-

der the toughest environmental conditions.





The HARDLOCK Set Screw. In making com-
parisons between the HARDLOCK Set

Screw and conventional fixing screws, fac-

tors such as the need for post-installation
maintenance, costs stemming from subse-

quent loosening and inspecting difficult to reach places must be taken

into account. When using the HLS, there is no need to consider these
problems, which adds up to a significant reduction in overall costs.

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SAFETY IS PARAMOUNT


So is— Product reliability


Price



Reduction in maintenance



























We have greatly reduced the likelihood of an



accident by elimination of



Manual handling of heavy liners



Hot work using Hardloc fasteners

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Features

Leveraging the power of the wedge principle used in ancient Jap-
anese architecture, the HARDLOCK® Nut is the ultimate self-
locking nut which completely integrates the nut and the bolt.


Self-locking effect recognized by the world
The HARDLOCK® Nut passes United States NAS (National Aer-
ospace Standard) aviation standards.


Torque and Axial Force control
Control the axial force with proper torque wherever used.


Reusable
Made of all metal with little few wear surfaces, sustains

a powerful self-locking effect.

Easy and efficient

Can be easily installed with just one commercially available tool.


Economical
Reduced maintenance and labor add up to a significant savings
in overall costs.


Self-locking design
The HARDLOCK® Nut has a structure that prevents looseness

through the traditional Japanese principle of the wedge. To effec-
tively utilize the wedge structure, two nuts are used: (1) a convex

nut with an eccentrically formed boss, and (2) a perfectly circular
concave nut. When these nuts are fastened together, the wedge

principle mechanically creates a powerful locking effect trans-

verse to the bolt shaft. This powerful anti-loosening effect
achieved with the HARDLOCK® Nut wedge completely fuses the

bolt and nut. Once locked with this powerful force, the HARD-
LOCK® Nut is not susceptible to impulsive forces or shocks.

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Standard materials and coatings



Material Coating

Electrogalvanized (trivalent chromate)
Class 4/low-carbon steel (JIS SS400 equivalent)
Hot-dip galvanized (HDZ35)
Class 8/medium-carbon steel (JIS S45C) Manganese Phosphate coating

A2/stainless steel (JIS SUS304 or equivalent) Unplated/plain


Dimensions in milimeters


Overall
Pitch Convex nut Concave nut Width across flats Unit Weight
d e height
P m m1 s ℓ g
Nominal
Size Coarse Fine Basic Tolerance Basic Tolerance Basic Tolerance Approx. Approx. Approx.




0
M6 1.0 0.75 5 ±0.48 5 ±0.48 10 11.5 9.2 3.3
-0.6
0
M8 1.25 1.0 6.5 ±0.58 6.5 ±0.58 13 15 12 8.6
-0.7
0
M10 1.5 1.25 8 ±0.58 8 ±0.58 17 19.6 14.4 17.6
-0.7
0
M12 1.75 1.25 10 ±0.58 10 ±0.58 19 21.9 17.9 27.3
-0.8
0
M14 2.0 1.5 11 ±0.7 11 ±0.7 22 25.4 19.9 39
-0.8
0
M16 2.0 1.5 13 ±0.9 12 ±1.0 24 27.7 23.2 52.8
-0.8
0
M18 2.5 1.5 15 ±0.9 14 ±1.0 27 -0.8 31.2 26.7 80
0
M20 2.5 1.5 16 ±0.9 15 ±1.0 30 34.6 28.2 105
-0.8
0
M22 2.5 1.5 18 ±0.9 17 ±1.0 32 37.0 32.3 130
-1.0
M24 3.0 2.0 19 ±0.9 18 ±1.0 36 0 41.6 33.9 180
-1.0
0
M27 3.0 2.0 21 ±1.0 21 ±1.0 41 47.3 37.9 246
-1.0
0
M30 3.5 2.0 23 ±1.0 23 ±1.0 46 53.1 41.9 375
-1.0
0 0
M33 3.5 2.0 25 ±1.0 20 50 57.7 39.4 411
-1.5 -1.0
0 0
M36 4.0 3.0 28 ±1.0 21 55 63.5 41.9 532
-1.5 -1.2
0
0
M39 4.0 3.0 30 ±1.2 23 -1.5 60 -1.2 69.3 45.7 681
0 0
M42 4.5 4.0 33 ±1.2 25 65 75.0 50.2 892
-1.5 -1.2
0
0
M45 4.5 4.0 35 ±1.2 27 -1.5 70 -1.2 80.8 54.2 1,115
0 0
M48 5.0 4.0 37 ±1.2 29 75 86.5 58.2 1,393
-1.5 -1.2

Overall
Pitch Convex nut Concave nut Width across flats Unit Weight
d e height
P m m1 s ℓ g

Nominal
Size Coarse Fine Basic Tolerance Basic Tolerance Basic Tolerance Approx. Approx. Approx.




0 0
M52 5.0 4.0 41 ±1.2 31 80 92.4 63.7 1,708
-1.5 -1.2
0 0
M56 5.5 4.0 44 ±1.2 34 85 98.1 68.7 2,047
-1.5 -1.4
0 0
M64 50 ±1.5 38 95 110 77 2,795
-1.5 -1.4
0 0
M68 53 ±1.5 40 100 115 81.1 3,480
-1.7 -1.4
0
0
M72 57 ±1.5 42 -1.7 105 -1.4 121 85.1 3,910
0 0
M76 60 ±1.5 46 110 127 92.1 4,440
-1.7 -1.4
0 0
M80 63 ±1.5 48 115 133 97.1 5,070
-1.7 -1.4
0
0
M85 67 ±1.5 50 -1.7 120 -1.4 139 101.1 5,630
0 0
M90 71 ±1.5 54 130 150 109.1 7,340
-2.0 -1.6
0 0
M95 6.0 4.0 75 ±1.5 57 -2.0 135 -1.6 156 115.1 8,150
0 0
M100 79 ±1.5 60 145 167 121.1 10,140
-2.0 -1.6
0 0
M105 83 ±1.8 63 150 173 127.4 11,140
-2.0 -1.6
0 0
M110 87 ±1.8 65 155 179 131.4 12,000
-2.0 -1.6
0 0
M115 91 ±1.8 69 165 191 139.4 14,780
-2.0 -1.6
0
0
M120 95 ±1.8 72 -2.0 170 -1.6 196 145.4 16,050
0 0
M125 99 ±1.8 76 180 208 153.4 19,410
-2.0 -1.6
0 0
M130 103 ±1.8 78 185 214 157.4 20,650
-2.0 -1.6

• External dimensions according to JIS B1181 (2004)/ISO 4032 (width across flats only)
• Threads screw tolerance according to JIS B0209 (2001)/ISO 965 6H
• Specifications, including size, are subject to change without notice.

Tightening Torque Table Dimensions



Recommended
Reference tightening torque for convex nut (same as general hex nut) tightening torque for
*70% of the bolt yield point
the concave nut
Class 4 Class 8 A2/stainless steel
Nominal Pitch (SS400 or equivalent) (S45C) (JIS SUS304 or equivalent)
size
4.8 8.8 Common to all
(320 N/mm ) (640 N/mm ) A2-50 A2-70 materials (Min – Max)
2
2
Manganese
CR3 HDZ35 Plain
Phosphate coating




M8 1.25 – – – – – 9–13
M10 1.5 – – – – – 18–24
M12 1.75 – – – – – 27–39
M14 2.0 55 125 110 36 75 40–58
M16 2.0 – – – – – 70–100
M18 2.5 115 270 230 75 165 100–150
M20 2.5 – – – 110 230 120–200
M22 2.5 – – – 145 315 150–250
M24 3.0 – – – 185 400 160–300
M27 3.0 – – – 275 585 250–390
M30 3.5 – – – 370 790 270–440
M33 3.5 770 1,795 1,540 505 1,080 290–490
M36 4.0 990 2,305 1,975 650 1,390 340–590
M39 4.0 1,280 2,985 2,555 840 1,800 390–640
M42 4.5 1,580 3,690 3,160 1,035 2,225 440–690
M45 4.5 1,980 4,620 3,960 1,300 2,785 490–740
M48 5.0 2,370 5,530 4,740 1,555 3,335 540–780
M52 5.0 3,075 7,175 6,150 2,020 4,325 590–830
M56 5.5 3,820 8,915 7,640 2,505 5,370 640–880
M64 5,765 13,445 11,525 3,780 8,105 690–930
M68 6,980 16,287 13,960 4,581 9,816
M72 8,370 19,531 16,741 5,493 11,771
M76 9,931 23,172 19,862 6,517 13,965
M80 11,677 27,246 23,353 7,663 16,420
M85 14,131 32,973 28,263 9,274 19,872
M90 16,907 39,450 33,814 11,095 23,776
M95 6.0 20,023 46,721 40,047 13,140 28,158
Tighten about 1 turn after tightening manually
M100 23,503 54,841 47,006 15,424 33,051
M105 27,363 63,847 54,726 17,957 38,479
M110 31,623 73,787 63,246 20,753 44,470
M115 36,302 84,705 72,605 23,823 51,050
M120 41,425 96,658 82,850 27,185 57,254
M125 47,006 109,682 94,013 30,848 66,103
M130 53,067 123,823 106,134 34,825 74,625

• Stop tightening if full contact is reached between the convex and concave nuts before reaching the highest recommend torque.
• The reference tightening torque for the convex nut is calculated on the basis of a torque coefficient of 0.15.
• The tightening torque for the convex nut with HDZ35 is calculated on the basis of a torque coefficient of 0.35.
• For the tightening torque of the A2/stainless steel convex nut, refer to the strength classification of the bolt used.
• Because the proof load of the convex nut is the same as a general single nut, there is no unique torque value.
• The concave nut can be tightened until contact with the convex nut even if the tightening torque exceeds the recommended maximum value because the torque coefficient
varies depending on the surface roughness.
• For HDZ concave nuts, tighten 50% more than the recommended torque value due to the high torque coefficient.

HARDLOCK® Nut installation




Use a tightening tool
(spanner, torque wrench etc.)

to tighten the Convex Nut to
the appropriate torque for the

application.


The convex nut has the same

strength class as a regular

hexagon nut and can therefore be tightened to its maxi-

mum limit.














Install the
Concave

nut onto the
Convex nut

manually by hand until it no longer
turns (in other words, until prevailing

torque is generated). Make sure that there is a gap of more
than 1 thread pitch between the nuts.


If the gap is less than 1 pitch, there may be a chance that

sufficient locking effect will not be produced so please re-
frain from using HARDLOCK® Nut with the bolt.


(The same conditions apply for reuse.)

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Use a torque wrench to tighten the Concave nut with
the recommended torque set by
HARDLOCK Industry Co., Ltd.


If it is difficult to manage the tighten-
ing torque of the Concave nut,

please use “one-sided contact” as
a guide for ensuring locking power.






When tightening the Concave nut

on to the Convex nut, one side of
the nuts will first come into contact,
which gives an indication of suffi-
cient locking effect (The Concave

nut will slightly incline after the con-
tact between the protrusion and the
recess.). When one-sided contact is
achieved, the tightening torque rapidly increases.


By applying additional torque , the nuts will come into full contact.
This state produces the ulti-
mate locking effect of the
HARDLOCK® Nut, but fur-

ther tightening may cause the
breakage of bolt threads.


It is recommended to stop
tightening the concave nut
when the nuts come into full
contact even though the ap-
plying torque is less than the maximum of recommended tightening

torque.


Even after correctly tightening the Concave nut with the torque within
the range of recommended tightening torque, there may remain
a gap between the nuts due to the tolerance of bolt diameter.


Even in this condition, sufficient locking effect is secured but

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HARDLOCK NUT INTRODUCTION



FEATURES OF HARDLOCK NUT
•0• Reusable without reduction in performance !
•g• Full torque management and completely fastened even with ZERO (D) clamp load !
6 Available in various materials and surface treatments tailored to the environment !
'0• No special tools required for installation !

LOCKING MECHANISM
HARDLOCK NUT consists of two nuts, the first lxit "Convex
Nut" @(clamping nut) kas a tmncated protrusion arranged
off-cemeron the upper surface.
The second nut "Concave Nut" (locking nut) is designed
with a concentric conical recess for locking the two
By tightening the concave nut omo the convex nut. a strong
perpend'icuIar load will be applied to the bolt from both sides,
PROVED SUPERIOR IN A VARIETY OF LOOSENING TESTS
1) Accelerated viblBtion test confDrlT\ing IO NAS 3350/3354 (National Aerospace Standard)
To determine the capability of fasteners to withstand accelerated vibration condltion.













HARDLOCK SET SCREW












■ IVIAINTENANCE-FREE WITH EXTRAORDINARY LOCKING PERFORMANCE














Used to fix core pins in casting/ molding dies and to lock shaft collars.

Mission



“To contribute to society by ensuring
Integrity and Safety through loosening
prevention fasteners.”

Mission



“To contribute to society by ensuring
Integrity and Safety through loosening
prevention fasteners.”

HARDLOCK’s
Clients

HARDLOCK’s
Clients

The origin of HARDLOCK Nut

SHINTO Gateway










Wedge Principal

The origin of HARDLOCK Nut

SHINTO Gateway










Wedge Principal

Wedge
2
1





Strike the wedge with a hammer. Push the wedge with a nut.

3





Integrate the wedge with the nut.

Wedge
2
1





Strike the wedge with a hammer. Push the wedge with a nut.

3





Integrate the wedge with the nut.

HARDLOCK NUT

CONFIGURATION










Convex Nut Concave Nut
(Tensioning) (Locking)

HARDLOCK NUT

CONFIGURATION










Convex Nut Concave Nut
(Tensioning) (Locking)

HOW TO


INSTALL



Nut

HOW TO


INSTALL



Nut

Mount the convex nut.

Mount the convex nut.

Torque the convex nut
the same you would a
regular nut.




Wrench

Torque the convex nut
the same you would a
regular nut.




Wrench

Mount concave nut

Mount concave nut

Wrench or socket will not
get snagged on bottom
nut. Wrench

Wrench or socket will not
get snagged on bottom
nut. Wrench

Torque the Concave nut to
enable the locking mechanism.
(Torque to recommendation)

Wrench

Torque the Concave nut to
enable the locking mechanism.
(Torque to recommendation)

Wrench

Locking Effect Proven in Vibration Tests (1)
HARDLOCK Nuts have been proven safety in typical vibration testing
(1) Transverse Vibration Testing
Junker test by using the test bench complying with the requirements of DIN65151 (now superseded by
DIN25201-4B) that applies a transverse motion to create cyclic vibration of variable frequency and amplitude.
If a transverse force acting on the bolted joint is greater than the frictional resistance of the preload, relative
motion occurs between the mating threads and the fastener bearing surface, which leads to fasteners
loosening.
[Test nuts]
Size: M10x1.5
Material: Class8 JIS S45C
[Testing conditions]
Amplitude: +/-0.35mm
Frequency: 10Hz


Dynamic transverse vibration test Comparison of self-loosening behavior of
bench fasteners
HARDLOCK Nut can withstand a transverse force that easily loosen ordinary nuts including typical
self-locking nuts.

Locking Effect Proven in Vibration Tests (1)
HARDLOCK Nuts have been proven safety in typical vibration testing
(1) Transverse Vibration Testing
Junker test by using the test bench complying with the requirements of DIN65151 (now superseded by
DIN25201-4B) that applies a transverse motion to create cyclic vibration of variable frequency and amplitude.
If a transverse force acting on the bolted joint is greater than the frictional resistance of the preload, relative
motion occurs between the mating threads and the fastener bearing surface, which leads to fasteners
loosening.
[Test nuts]
Size: M10x1.5
Material: Class8 JIS S45C
[Testing conditions]
Amplitude: +/-0.35mm
Frequency: 10Hz


Dynamic transverse vibration test Comparison of self-loosening behavior of
bench fasteners
HARDLOCK Nut can withstand a transverse force that easily loosen ordinary nuts including typical
self-locking nuts.

Locking Effect Proven in Vibration Tests (2)
HARDLOCK Nuts have been proven safety in typical vibration testing
(2) Accelerated Vibration Test
NAS 3350/NASM1312-7 (for Metric NA0009/NAM1312-107) establishes a standard procedure for
conducting accelerated vibration test on fastener systems. Upon completion of the 30,000 cycles (17
minutes), the relative rotation between any nuts and bolt shall not exceed 360 degrees. The test shall be
stopped prior to the completion of the 30,000 cycles in the event that a nut rotates more than 360 degrees.
Impact stroke [Test nuts]
Size: M12x1.75
Material: Class4 JIS SS400 equivalent
[Test conditions]
Testing frequency: 29 - 30 Hz
Vibration stroke Vibration stroke: 11mm
Impact stroke: 18mm
Test Passed (17 mins completed)
HARDLOCK
NUT
Loosened before reaching 17 mins
Castle Nut & Cotter Pin
Other Self-Locking Nut 360sec
Nylon Nut
Double-Nut 90sec
Single Nut & Spring 30sec 60sec
Washer 20sec
Single Nut 12sec
NAS testing machine Test results
HARDLOCK Nut stayed tight after 30,000 cycles (17 minutes) testing.

Locking Effect Proven in Vibration Tests (2)
HARDLOCK Nuts have been proven safety in typical vibration testing
(2) Accelerated Vibration Test
NAS 3350/NASM1312-7 (for Metric NA0009/NAM1312-107) establishes a standard procedure for
conducting accelerated vibration test on fastener systems. Upon completion of the 30,000 cycles (17
minutes), the relative rotation between any nuts and bolt shall not exceed 360 degrees. The test shall be
stopped prior to the completion of the 30,000 cycles in the event that a nut rotates more than 360 degrees.
Impact stroke [Test nuts]
Size: M12x1.75
Material: Class4 JIS SS400 equivalent
[Test conditions]
Testing frequency: 29 - 30 Hz
Vibration stroke Vibration stroke: 11mm
Impact stroke: 18mm
Test Passed (17 mins completed)
HARDLOCK
NUT
Loosened before reaching 17 mins
Castle Nut & Cotter Pin
Other Self-Locking Nut 360sec
Nylon Nut
Double-Nut 90sec
Single Nut & Spring 30sec 60sec
Washer 20sec
Single Nut 12sec
NAS testing machine Test results
HARDLOCK Nut stayed tight after 30,000 cycles (17 minutes) testing.

Junker Vibration Test Mechanism

Test Nut Washer
Glider Plate




Load Cell Fixed Plate

Junker Vibration Test Mechanism

Test Nut Washer
Glider Plate




Load Cell Fixed Plate

Considerations for Designing with
HARDLOCK Nut.

Considerations for Designing with
HARDLOCK Nut.

Not enough threads for HARDLOCK Nut installation

Not enough threads for HARDLOCK Nut installation

Available threads sufficient for good locking

Available threads sufficient for good locking

The gap between

HARDLOCK Nuts
gives you a good
indication about the
locking.

The gap between

HARDLOCK Nuts
gives you a good
indication about the
locking.

Free spinning nut
doesn’t require
prevailing torque