3/4" Extensions | McMaster-Carr

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	System of Measurement System of Measurement

Inch

	Length Length	Show

3/4"

	Length Length	Hide

4 1/4" to 5 1/2"

7" to 12 1/2"

9 3/8"-32 3/8"

22" to 55"

6 to 18 ft.

2 to 4 ft.

3 to 5 3/4 ft.

3 to 6 ft.

3 ft. to 60"

4 to 7 ft.

4 to 8 ft.

4 to 12 ft.

6 to 9 ft.

6 to 11 ft.

6 to 12 ft.

7 to 15 ft.

8 to 13 ft.

8 to 15 ft.

8 to 22 ft.

10 to 17 ft.

	Spring Type Spring Type

	Extension

	Material Material

	OD OD

	End Type End Type

	Hook
	Loop

	Thread Size Thread Size

	Extended Length @ Maximum Load Extended Length @ Maximum Load

	Wire Diameter Wire Diameter

	Rate Rate

	Load Load

0.03-0.18 lbs.

0.03-0.37 lbs.

0.04-0.23 lbs.

0.04-0.45 lbs.

0.04-0.5 lbs.

0.05-0.31 lbs.

0.05-0.36 lbs.

0.05-0.52 lbs.

0.05-0.58 lbs.

0.05-0.6 lbs.

0.06-0.31 lbs.

0.06-0.62 lbs.

0.06-0.64 lbs.

0.06-0.7 lbs.

0.07-0.77 lbs.

0.08-0.4 lbs.

0.08-0.49 lbs.

0.08-0.52 lbs.

0.08-0.78 lbs.

0.08-0.83 lbs.

0.08-0.91 lbs.

0.08-0.96 lbs.

0.09-0.49 lbs.

0.1-1 lbs.

0.1-1.03 lbs.

0.1-1.09 lbs.

0.1-1.1 lbs.

0.1-1.15 lbs.

0.11-0.71 lbs.

0.11-0.75 lbs.

0.11-1.18 lbs.

0.12-0.68 lbs.

0.12-1.35 lbs.

0.13-1.46 lbs.

0.14-1.25 lbs.

0.14-1.55 lbs.

0.15-0.63 lbs.

0.15-0.76 lbs.

0.16-0.92 lbs.

0.16-0.94 lbs.

0.16-1.79 lbs.

0.17-0.74 lbs.

0.17-0.75 lbs.

0.17-1.08 lbs.

0.17-1.26 lbs.

0.17-1.5 lbs.

0.17-1.8 lbs.

0.17-2.26 lbs.

0.18-0.89 lbs.

0.18-1.05 lbs.

0.19-2.07 lbs.

0.19-2.15 lbs.

0.2-2.6 lbs.

0.25-0.88 lbs.

0.25-1.51 lbs.

0.25-1.53 lbs.

0.25-2.75 lbs.

0.26-0.94 lbs.

0.26-1.1 lbs.

0.26-1.65 lbs.

0.28-1.2 lbs.

0.28-1.41 lbs.

0.29-2.03 lbs.

0.3-3 lbs.

0.3-3.3 lbs.

0.31-3.45 lbs.

0.33-1.09 lbs.

0.33-1.19 lbs.

0.33-2.12 lbs.

0.33-2.13 lbs.

0.35-3.89 lbs.

0.35-3.91 lbs.

0.37-1.37 lbs.

0.4-4.2 lbs.

0.4-4.5 lbs.

0.41-1.29 lbs.

0.41-1.52 lbs.

0.42-1.51 lbs.

0.42-2.62 lbs.

0.42-2.85 lbs.

0.42-4.41 lbs.

0.42-4.91 lbs.

0.43-2.98 lbs.

0.45-5.06 lbs.

0.46-1.51 lbs.

0.49-1.78 lbs.

0.49-2.08 lbs.

0.5-2.6 lbs.

0.5-3.69 lbs.

0.5-5.3 lbs.

0.5-5.66 lbs.

0.5-5.9 lbs.

0.52-5.82 lbs.

0.54-3.49 lbs.

0.54-3.5 lbs.

0.54-5.83 lbs.

0.56-6.26 lbs.

0.58-1.73 lbs.

0.58-1.82 lbs.

0.58-2.04 lbs.

0.58-3.89 lbs.

0.58-6.58 lbs.

0.6-6.8 lbs.

0.62-2.03 lbs.

0.65-7 lbs.

0.65-7.2 lbs.

0.67-4.53 lbs.

0.67-4.9 lbs.

0.67-7.25 lbs.

0.67-7.47 lbs.

0.68-2.25 lbs.

0.68-2.62 lbs.

0.7-7.9 lbs.

0.71-2.38 lbs.

0.71-2.45 lbs.

0.75-3.15 lbs.

0.75-5.17 lbs.

0.78-8.86 lbs.

0.8-8.7 lbs.

0.81-8.97 lbs.

0.87-4.1 lbs.

0.87-6.24 lbs.

0.87-9.7 lbs.

0.9-4.2 lbs.

0.9-5.2 lbs.

0.9-5.3 lbs.

0.9-10.2 lbs.

0.98-2.55 lbs.

0.98-2.98 lbs.

1.05-11.65 lbs.

1.89-5 lbs.

2-3.6 lbs.

	Nut Type Nut Type


Coupling	Hex

	Width Width

5/16"

3/8"

1/2"

	Threading Threading

	Fully Threaded

	Thread Direction Thread Direction

	Right Hand

	Thread Spacing Thread Spacing

Coarse

Fine

	Coupling Nut Profile Coupling Nut Profile

Standard

	Finish Finish

Black Oxide

Zinc Plated

Zinc-Aluminum Coated

	Thread Fit Thread Fit

Class 2B

	Thread Type Thread Type

UNC

UNF

	Fastener Strength Grade/Class Fastener Strength Grade/Class


Grade 2	Grade 5

	Sight Hole Diameter Sight Hole Diameter

5/64"

3/32"

	Specifications Met Specifications Met

ASTM

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156 Products

Coupling Nuts

Low-Strength Steel Coupling Nuts

About half the strength of medium-strength steel coupling nuts, these nuts are for light duty fastening applications.

Medium-Strength Steel
Coupling Nuts—Grade 5

Made from Grade 5 steel, these inch-sized coupling nuts are suitable for most applications.

18-8 Stainless Steel Coupling Nuts

These coupling nuts have good chemical resistance.

Super-Corrosion-Resistant 316
Stainless Steel Coupling Nuts

More corrosion resistant than 18-8 stainless steel coupling nuts, these nuts have excellent resistance to chemicals and salt water.

Aluminum Coupling Nuts

One-third the weight of steel, aluminum coupling nuts resist corrosion in wet environments.

Brass Coupling Nuts

Brass coupling nuts are corrosion resistant in wet environments and electrically conductive.

Plastic Coupling Nuts

Plastic coupling nuts are chemical resistant, nonconductive, and lightweight.

Coupling Nuts with Sight Hole

Use the sight hole to check for proper thread engagement.

Extension Springs

Extension Springs with Loop Ends

Use these steel springs in noncorrosive environments.

Corrosion-Resistant Extension
Springs with Loop Ends

Made of stainless steel, these springs are more corrosion resistant than steel extension springs.

Corrosion-Resistant Extension
Springs with Hook Ends

Made of stainless steel, these springs are more corrosion resistant than steel extension springs.

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Coupling Nuts

Low-Strength Steel Coupling Nuts

Medium-Strength SteelCoupling Nuts—Grade 5

18-8 Stainless Steel Coupling Nuts

Super-Corrosion-Resistant 316Stainless Steel Coupling Nuts

Aluminum Coupling Nuts

Brass Coupling Nuts

Plastic Coupling Nuts

Coupling Nuts with Sight Hole

Extension Springs

Extension Springs with Loop Ends

Corrosion-Resistant ExtensionSprings with Loop Ends

Corrosion-Resistant ExtensionSprings with Hook Ends

Medium-Strength Steel
Coupling Nuts—Grade 5

Super-Corrosion-Resistant 316
Stainless Steel Coupling Nuts

Corrosion-Resistant Extension
Springs with Loop Ends

Corrosion-Resistant Extension
Springs with Hook Ends