1 1/4"-12 Pins | McMaster-Carr

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For Maximum Trailer Weight

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3 1/2"

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11 Products

Hitch Inserts

Insert Shown with Hitch-Ball Components

Use these inserts in hitch-ball connections for towing. They fit into a receiver that's attached to a vehicle. Maximum trailer weight is the total weight being towed. Vertical capacity (also known as tongue weight) represents the weight of the load on the hitch ball.

Height Adapters for Hitch Balls


(Shown in Drop Position)	(Shown in Raise Position)

Height adapters for hitch balls raise or drop the ball to the height that works for your trailer. From the drop position, rotate the adapter 180° to achieve the raise position.

	Vert. Cap., lb.	Drop Ht.	Rise Ht.	Overall Dp.	For Hitch Receiver Size	For Hitch Ball Thread Size		Each
Powder-Coated Steel



	12,000	1,200	3 1/2"	2"	10 1/2"	2 1/2" Square	1 1/4"-12	7765T61	000000


	12,000	1,200	5"	3 1/2"	10 1/2"	2 1/2" Square	1 1/4"-12	7765T62	00000
	12,000	1,200	6"	5"	10 1/4"	2" Square	1 1/4"-12	7765T59	00000
	12,000	1,200	6 3/4"	5"	10 1/2"	2 1/2" Square	1 1/4"-12	7765T63	00000

Hitch Balls

Mount these onto a hitch insert, and connect them to a trailer with a hitch-ball coupler. Maximum trailer weight is the total weight being towed.

	Hitch Ball Dia.	Thread Size	Stud Lg.		Each
Chrome-Plated Steel Hitch Balls



	10,000	2 5/16"	1 1/4"-12	2 1/8"	8785T6	000000

Hydraulic Cylinder Clevis Rod Ends


Clevis Rod Ends

Connect a clevis rod end to a hydraulic cylinder to create a bend or pivot. Use these with pivot brackets and clevis pins (each component sold separately). They’re also known as yoke-end linkages.

Stainless Steel—Stainless steel clevis rod ends are more corrosion resistant than steel clevis rod ends in wet environments.

					Overall			Shank
	For Bore Dia.	For Pin Dia.	Jaw Opening Wd.	Shank Ctr. Lg.	Wd.	Lg.	Ht.	Thread Size	Gender	Threading	For Hydraulic Cylinder Mounting Pattern		Each
Iron



		4"	1 3/8"	2 1/16"	4 1/8"	4 1/16"	5 1/2"	2 3/4"	1 1/4"-12	Female	Fully Threaded	NFPA Light Duty, NFPA/JIC Heavy Duty	62205K49	0000000


		Stainless Steel



				—	1 3/8"	2 1/16"	4 1/8"	4 1/16"	5 1/2"	2 3/4"	1 1/4"-12	Female	Fully Threaded	NFPA Light Duty, NFPA/JIC Heavy Duty	6043N14	00000000

Go/No-Go Threaded Plug Gauges with Handle

Speed up thread tolerance checks—the handle on these gauges gives you a good grip to quickly thread and unthread go or no-go gauges. Use these gauges to make sure nuts, tapped holes, and other parts fall within tolerance. All are precisely manufactured to confirm thread fit. If the plug gauges wear down, you can insert new ones (not included) onto the taperlock handle.

A part is within tolerance if it’s easy to thread the go gauge into the part but difficult to thread the no-go gauge more than two turns.

Go/no-go gauges have both a go gauge on one end of the handle and a no-go gauge on the other to speed up tests. Go gauges check the minimum internal thread size. No-go gauges check the maximum internal thread size.

Class X Gauge

Double-Ended Taperlock

Handle

Calibration Certificate Traceable to NIST—Gauges with a calibration certificate traceable to NIST were calibrated in a lab. The certificate, sometimes called a test report or long-form certificate, details the tested measurements.

For Class 2B Unified Standard Thread Fit—For inch threads, the higher the class number, the tighter the fit. Unified Standard Class 2B is standard and works for most applications.

For Class 3B Unified Standard Thread Fit—The tightest fit for inch-sized threads. Unified Standard Class 3B fits completely flush in applications where parts need to stay in place, such as engines and suspension systems.

For Thread Fit—Thread fit designates the tightness or looseness of mating threads.

	Thread Type	Pitch Dia. Tolerance	Hardness	Material	Features	Choose a Thread Fit		Each
Go/No-Go Gauges



	1 1/4"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A546	0000000


	Go/No-Go Gauges with Calibration Certificate Traceable to NIST



			1 1/4"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A53	000000

Go/No-Go Left-Hand Threaded Plug Gauges with Handle

A go and no-go gauge in one, these gauges check that left-hand threads fall within tolerance. Use them to confirm thread fit for nuts, tapped holes, and other parts. The taperlock handle speeds up tests, giving you a good grip to thread and unthread each gauge end. It also lets you swap out worn gauges for new ones (not included) on either end.

The go gauge checks the minimum internal thread size, and the no-go gauge checks the maximum. A part is within tolerance if it’s easy to thread the go gauge but difficult to thread the no-go gauge more than two turns.

Class X Gauge

Plug Gauges with Accuracy Certificate Traceable to NIST—Gauges with an accuracy certificate traceable to NIST include verification from the manufacturer that their thread sizes are within tolerance. The certificate is also known as a certificate of compliance or a short-form certification.

Plug Gauges with Calibration Certificate Traceable to NIST—Gauges with a calibration certificate traceable to NIST were calibrated in a lab. The certificate, sometimes called a test report or long-form certificate, details the tested measurements.

For Class 2B Unified Standard Thread Fit—For inch threads, the higher the class number, the tighter the fit. Unified Standard Class 2B is standard and works for most applications.

For Thread Fit—Thread fit designates the tightness or looseness of mating threads.

	Thread Type	Pitch Dia. Tolerance	Hardness	Material	Features	Choose a Thread Fit		Each
Plug Gauges with Accuracy Certificate Traceable to NIST



	1 1/4"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7935N109	0000000


	Plug Gauges with Calibration Certificate Traceable to NIST



			1 1/4"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7938N109	000000