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Eight Tool TM-3 – 3mm Hexagon L Wrench

Eight Tool TM-3 – 3mm Hexagon L Wrench

$8.50 AUD +GST

Only 1 left in stock

Excellent series 3mm hexagon wrench.

  • Taper head on long end of wrench for effective pre-fastening and final tightening
  • Long end of wrench can be used at upto 25 degree angle
  • Silkscreened printing of wrench sizes for easy identification. (for wrenches 2.5mm and larger)

Sku: TM-3

Replacement individual wrench for the following wrench sets:

Material: SNCM+V Alloy steel

Hard-chrome plated finish.

HRC: 53-60

Made in Japan.

Only 1 left in stock

SKU: eight-tool-TM-3Categories: , Tags: , , , , , , ,

Description

Excellent series 3mm hexagon wrench.

  • Taper head on long end of wrench for effective pre-fastening and final tightening
  • Long end of wrench can be used at upto 25 degree angle
  • Silkscreened printing of wrench sizes for easy identification. (for wrenches 2.5mm and larger)

Sku: TM-3

Replacement individual wrench for the following wrench set:

Material: SNCM+V Alloy steel

Hard-chrome plated finish.

HRC: 53-60

Made in Japan.

Dimensions (Metric size)
Item No. H L1 L2
TM-3 3 20 101

Additional information

Weight 0.03 kg

Excellent Series

We are the only manufacturer in Japan specializing in high-quality hexagon wrench.
All the products are produced in our factory under the strict quality control with a quality assurance system.

Excellent Series Features

MATERIAL:
Special Version of SNCM+V® alloy steel Specially developed for “EIGHT” Hexagon Key Wrenches characterized by tougher resistance against abrasion and high torque to realize the best quality ever as had in the world.

ACCURACY:
Held at the most strict standard for the accurate shaping of flats and corners to enable precise fitting to fasteners’holes, and to achieve a remarkable resistance against abrasion.

HARDNESS:
Rockwell “C” Scale 55~60 degree
hardness standard exceeds any other to provide high torsional strength and durability in addition to exceptional toughness.

SURFACE FINISH:
Chamfered ends permit easy fitting to fasteners’ holes and allow for an excellent grip.

HARD-CHROME PLATING:
The best plating for Hexagon wrenches is applied to keep strict accuracy, powerful rust resistance and beautiful appearance.

Taper Head

-further improved in durability and abrasion resistance. Suitable for use even when performing final tightening
-torsional strength is greater by 10-20% compared to ball point hexagon wrenches
-especially effective when tilted at a 0-20 degrees angle

Taper Head Features
  • It is more durable and wears less as the hexagon taper head fits precisely into the bolt hole and turn the bolt as you can see in the picture.
  • The taper head finish is precise, accurate, and consistent with Eight Tool’s unique manufacturing process.
  • The contact area between a bolt and it’s socket is larger compared to a previous product, so the wrench fits precisely and does not slip when used straight or at a tilted angle.
  • In addition to the features above, special alloy steel and hardness contribute to abrasion resistance when applying high torque.

Screw Compatibility Table (Hexagon)

Metric Size
Nominal Size
Cap Bolt
Set Screw
Flat Head Screw
Button Head Bolt
Taper Plug Screw
0.71 M1.14
M1.16
M1.18
0.89 M2
1.27 M1.4 M2.5
1.5 M1.6
M2
M3
2 M2.5 M4 M3 M3
2.5 M3 M5 M4 M4
3 M4 M6 W1/4″ M5 M5
4 M5 M8 W5/16″ M6 M6
5 M6 W1/4″ M10 W3/8″ M8 M8 1/8″
6 M8 W5/16″
M12
M14
W1/2″
M10 M10 1/4″
8
M10 W3/8″
W7/16″
M16 W5/8″ M12 M12 3/8″
10 M12 W1/2″
M18
M20
W3/4″
M14
M16
M14
M16
1/2″
12 M14 M22
M24
M18
M20
M18
M20
14 M16 W5/8″
M18 W3/4″
M22
M24
M22
M24
3/4″
17 M20 W5/8″
M22 W1″
1″
19
M24
M27
W1 1/8″
21 W1 1/4″
W1 3/8″
22 M30 1 1/2″
24 M33
26 W1 1/2″
W1 3/4″
27 M36
M39
32
M42
M45
W2″
36 M48
M52

The prefix W stands for screw of Whitworth size and M for Metric size.

The figures after these prefixes show the diameter of given screw or bolt.

Inch Size
Nominal Size
Cap Bolt
Set Screw
Flat Head Screw
Button Head Bolt
Taper Plug Screw
0.028″ #0 (1.52)
0.035″ #1 (1.85)
#2 (2.18)
#0 (1.52) #0 (1.52)
0.05″ #0 (1.52) #3 (2.51)
#4 (2.84)
#1 (1.85)
#2 (2.18)
#1 (1.85)
#2 (2.18)
1/16″ #1 (1.85) #5 (3.17)
#6 (3.50)
#3 (2.51)
#4 (2.84)
#3 (2.51)
#4 (2.84)
5/64″ #2 (2.18)
#3 (2.51
#8 (4.16) #5 (3.17)
#6 (3.50)
#5 (3.17)
#6 (3.50)
3/32″ #4 (2.64)
#5 (3.17)
#10 (4.82) #8 (4.16) #8 (4.16)
7/64″ #6 (3.50)
1/8″ 1/4″ #10 (4.82) #10 (4.82)
9/64″ #8 (4.16)
5/32″ #10 (4.82) 5/16″ 1/4″ 1/4″ 1/8″
3/16″ 1/4″ 3/8″ 5/16″ 5/16″ 1/8″
7/32″ 7/16″ 3/8″ 3/8″
1/4″ 5/6″ 1/2″ 7/16″ 1/4″
5/16″ 3/8″ 5/8″ 1/2″ 1/2″ 3/8″
3/8″ 7/16″ 1/2″ 3/4″ 5/8″ 5/8″ 1/2″
7/16″ 9/16″
1/2″ 5/8″ 7/8″ 3/4″
9/16″ 1″ 1 1/8″ 3/4″
5/8″ 3/4″ 1 1/4″ 1 3/8″ 1″
3/4″ 7/8″ 1″ 1/2″ 1 1/4″
7/8″ 1 1/8″ 1 1/4″
1″ 1 3/8″ 1 1/2″ 1 3/4″ 2″ 1/2″ 2″

The figures in parentheses show metric size and the fractions show size in inches.

The inch size screws are Unify screw in ISO standards. Unify screw is specified as the screw with 60 degree thread both in UNF and UNC specification.

Conversion Table of Inch and Metric Size
  • 1/8″ = 3.18mm
  • 7/16″ = 11.11mm
  • 3/4″ = 19.05mm
  • 1/4″ = 6.35mm
  • 1/2″ = 12.70mm
  • 7/8″ = 22.23mm
  • 5/16″ = 7.94mm
  • 9/16″ = 14.29mm
  • 1″ = 25.4mm
  • 3/8″ = 9.53mm
  • 5/8″ = 15.88mm

About Torque

What is torque?

  • Torque is the measure of a force’s tendency to produce rotation or torsion.
  • The measure of Torque is now used for screw fastening using a tools like hexagon wrenches.
    • Torque is defined as “Force” × “Lever-arm distance”.

For instance, when holding and applying force to a hexagon wrench inserted in a hexagon socket head bolt at 0.2m away from the center of the bolt with force of 10N, the tightening force is;

from the Formula : FXL=T (F: Force N, L: Lever-arm distance m, T: Torque N・m)

10N × 0.2m = 2.0 N・m It is also deduced from the Formula that F (force applied) necessary to obtain the tightening torque of 2.0 N・m with L:0.4m is 5N.

  • ISO and JIS stipulate a guaranteed torque value for each size of hexagon wrenches within which they will not be broken, twisted, distorted in a hexagon shape or bent to the extent that they will become unusable. They also demonstrate the test method with a torque wrench.
  • ISO and JIS specify that hexagonal wrenches shall not be broken or cause any irregularities such as twisting, deformation in the hexagon shape, or bending when used within proof torque values (ISO 2934,JIS B 41648).

-JIS specification shows proof torque values for each size as well as the test method using a torque wrench.

Maximum torque that human hands can produce

(test value of hexagon wrenches)

Type L-Type Standard Size L-Type Extra Long
Flat hexagon(mm) (N・m) L 2 (mm) (N・m) L 2 (mm)
1.5 *1.32 52 *1.32 80
2 *3.24 58 *3.24 95
2.5 5.88 60 *6.37 110
3 6.37 65 8.83 126
4 10.8 72 16.8 142
5 12.8 80 26.5 160
6 24.5 90 58.8 180
8 39.2 100 78.5 200
10 44.1 112 88.3 224

*The figures with (*) mark = The maximum torque human hands can produce exceeds the maximum value of hexagon wrench.

Torque Comparison Table

Torque Value Comparison of excellent series, JIS/ISO guaranteed and MAX torque (reference value) Unit N・m

Item Hardness in HRC
Size in mm Standards GRNTD. MAX. GRNTD. MAX. GRNTD. MAX.
1.5 EIGHT 0.88 1.28 0.49 0.64 0.49 0.64 57.5
JIS – ISO 0.82 52.0
2 EIGHT 2.25 3.22 1.39 1.58 1.41 1.58 57.5
JIS – ISO 1.90 52.0
2.5 EIGHT 4.21 6.02 2.75 3.24 2.83 3.58 57.5
JIS – ISO 3.80 52.0
3 EIGHT 7.85 11.20 5.02 5.61 5.11 5.83 57.0
JIS – ISO 6.60 52.0
4 EIGHT 19.00 25.00 12.00 13.00 13.00 15.00 56.5
JIS – ISO 16.00 52.0
5 EIGHT 37.00 48.00 20.60 25.00 22.00 28.00 56.5
JIS – ISO 30.00 52.0
6 EIGHT 70.00 87.00 36.00 40.00 38.00 46.00 56.5
JIS – ISO 52.00 52.00
8 EIGHT 158.00 215.80 80.00 95.00 90.00 105.00 55.00
JIS – ISO 120.00 50.0
10 EIGHT 268.00 411.00 158.50 171.50 182.00 208.00 55.0
JIS – ISO 220.00 48.0
12 EIGHT 480.00 620.00 290.00 320.00 54.0
JIS – ISO 370.00 48.0
14 EIGHT 740.00 990.00 440.00 515.00 54.0
JIS – ISO 590.00 48.0
17 EIGHT 1,350.00 800.00 910.00 53.0
JIS – ISO 980.00 45.0
19 EIGHT 1,850.00 1,100.00 1,240.00 53.0
JIS – ISO 1,360.00 45.0

REMARKS:

GUARANTEED TORQUE (GRNTD): Maximum torque of tightening a screw without transformation and breakage.

MAXIMUM TORQUE (MAX) : Maximum torque of tightening a screw at the time of breakage.

*The figure of maximum torque is the most important to evaluate the durability of tools.

Directions for Use

Followings are the instructions and directions to prevent product damages or bends as well as to prevent accidents or injuries. We cannot guarantee the quality of our products and we are not responsible for any injury if the instructions and directions are not followed.

* Guaranteed torque value for our hexagon wrenches are in Torque Comparison Table.

Precautions for Products
Please use a product within the proper guaranteed torque value.

Fastening a screw with too much torque does not work well. It may end up wearing out the screw or damaging the bearing surface greatly, which would lead to a screw loose in time.

Regarding screws for a cutting turning tool, loosening a screw requires larger force than fastening it because of a thermal expansion after use. Please be aware that you might break a wrench or get seriously injured if you use a product with more than the guaranteed torque value.

  • Use a product only for the purpose of turning a screw.
  • Use a hexagon wrench that fits the screw hole.
  • Do not use any pipe or ring wrench unless it is an attached accessory.
  • Do not hammer a wrench or give it an impact torque. Rough use may reduce product life or break the product.
  • Do not burr a slot.
  • Do not use a deformed wrench. Since the strength of a twisted or bended wrench is greatly deteriorated due to the metal fatigue, using a deformed wrench even within the guaranteed torque value may cause a damage.
  • Do not weight on the product for fastening. The wrench may slip and the metal fatigue may cause the bolt to twist off or the wrench to break.
  • Since thin wrenches can be broken with a hand, overuse of a wrench is dangerous.
  • Be careful about straining the products with small neck diameters such as taper head wrench and ball point wrench.
  • Wear protective goggles. (when you cannot avoid overuse of a product)
  • Clear the bolt hole. Chips in the hole disturb the wrench fit, which may result in a decrease of life duration of a bolt and wrench.
  • Do not use a wrench for a worn-down bolt. The wrench may slip and it’s dangerous.
  • Do not reprocess the chip of a wrench. Heat deteriorates the material and it may result in a damage or abrasion.
  • Beware of electrical shock. Wrenches are metal. You will get an electric shock if you use a wrench when electricity is around.
  • Since the hole of a Torx screw is shallow, insert a wrench straight. Otherwise, the wrench may slip and damage a screw and it’s dangerous.
  • Tamper resistant screws are used to maintain the function of equipment, or to prevent accidents including gas leakage. Therefore, they must not be loosened. Please use a product only when you can make sure of the safety. We are not responsible for any accidents arising from what is explained above.
  • Use a product that fits a screw hole.
  • Some of the blister packs and mat boards for our products have angular corners. Be careful when you open a product especially for staplers.
  • Do not use an impact wrench for an O-ring socket or a socket with no pins.
Wrench and Metal Fatigue

– Compared to other tools, a hexagon wrench is long and thin, and has a smaller cross-sectional area in relation to thread diameter. A large force will result in a flexibility and twist of a product.

Therefore, brute force as for another tool in a bigger size of the cross-section will lead to damages of a product.

The stress point at which a material, if subjected to higher stress, will no longer return to its original shape, is called “Elastic Limit”. Our ”guaranteed torque value” is based on the “Elastic Limit” according to ISO/JIS. Therefore, the stress at “Elastic Limit” can be considered to be the “guaranteed torque value”.

– Stress over the “Elastic Limit” ≒ “Guaranteed torque value” causes the mental fatigue to a wrench.

– “Guaranteed torque value” is the value before the mental fatigue is caused. Once the mental fatigue is caused to a product, the possibility that stress even within the “guaranteed torque value” may damage a product will be extremely high. 

– Once a wrench becomes twisted or bended, the metal fatigue stays even if the wrench is brought back to its original form

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