Cotter Pins

Cotter pins -- also known as split pins -- are thin metal pieces used to lock castle nuts in place on machine parts fitted to a shaft. They may be simple in design, but cotter pins are the key to preventing rotary parts from becoming loose and falling off during use. Let us help you identify the appropriate design for your needs, so you can always have a ready selection of pins on hand.

Cotter Pin Assortments

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1 - 50 of 572 results

APPROVED SUPPLIER

.178Wd X 3 3/4" Lg Hairpin Cotter Fits Hole 3/16'

#73563 | Pkg Qty:5

APPROVED SUPPLIER

1/8 X 2 Cotter Pin Plated

#70726 | Pkg Qty:125

APPROVED SUPPLIER

1/8 X 1-1/2 Cotter Pin Plated

#70724 | Pkg Qty:125

APPROVED SUPPLIER

.12Wd X 2 3/8" Hairpin Cotter Fits Hole 1/8"

#73561 | Pkg Qty:5

APPROVED SUPPLIER

5/32 X 1-1/2 Cotter Pin Plated

#70732 | Pkg Qty:125

APPROVED SUPPLIER

3/32 X 1 Cotter Pin Plated

#70709 | Pkg Qty:125

APPROVED SUPPLIER

Carbon Steel Extended Prong Cotter Pin, 1" L, 1/8" Pin Dia.

#70722 | Pkg Qty:125

APPROVED SUPPLIER

.148Wd X 2 15/16" Hairpin Cotter Fit Hole 5/32"

#73505 | Pkg Qty:25

APPROVED SUPPLIER

5/32 X 2 Cotter Pin Plated

#70734 | Pkg Qty:125

APPROVED SUPPLIER

3/16 X 1-1/2 Cotter Pin Plated

#70739 | Pkg Qty:125

APPROVED SUPPLIER

3/32 X 1-1/2 Cotter Pin Plated

#70711 | Pkg Qty:125

APPROVED SUPPLIER

1/4 X 3 Cotter Pin Plated

#70748 | Pkg Qty:50

APPROVED SUPPLIER

3/16 X 2 Cotter Pin Plated

#70740 | Pkg Qty:125

APPROVED SUPPLIER

Low Carbon Steel Extended Prong Cotter Pin, 2-1/2" L, 5/32" Pin Dia.

#70735 | Pkg Qty:125

APPROVED SUPPLIER

.177Wd X 3 3/4" Hairpin Cotter Fits Hole 3/16"

#73506 | Pkg Qty:25

APPROVED SUPPLIER

Carbon Steel Extended Prong Cotter Pin, 1" L, 1/16" Pin Dia.

#70702 | Pkg Qty:125

APPROVED SUPPLIER

7/64 X 1 Cotter Pin Plated

#70716 | Pkg Qty:125

APPROVED SUPPLIER

3/32 X 2 Cotter Pin Plated

#70713 | Pkg Qty:125

APPROVED SUPPLIER

3/32 X 3/4 Cotter Pin Plated

#70708 | Pkg Qty:125

APPROVED SUPPLIER

.148Wd X 2 11/16" Lg Hairpin Cotter Fits Hole 5/32"

#73562 | Pkg Qty:5

APPROVED SUPPLIER

Low Carbon Steel Extended Prong Cotter Pin, 3" L, 3/16" Pin Dia.

#70742 | Pkg Qty:125

APPROVED SUPPLIER

3/8 X 3 Cotter Pin Plated

#70762 | Pkg Qty:50

APPROVED SUPPLIER

Hairpin Cotter Pin 1/8" Wd X 2-9/16" Lng Fits Hole 9/64"

#73509 | Pkg Qty:25

APPROVED SUPPLIER

.092Wd X 1 7/8" Hairpin Cotter Fits Hole 7/64"

#73560 | Pkg Qty:5

APPROVED SUPPLIER

1/16 X 1-1/2 Cotter Pin Plated

#70704 | Pkg Qty:125

APPROVED SUPPLIER

3/32 X 1-1/4 Cotter Pin Plated

#70710 | Pkg Qty:125

APPROVED SUPPLIER

1/2 X 4 Cotter Pin Plated

#70771 | Pkg Qty:25

APPROVED SUPPLIER

1/8 X 1-1/4 Cotter Pin Plated

#70723 | Pkg Qty:125

APPROVED SUPPLIER

5/32 X 1 Cotter Pin Plated

#70730 | Pkg Qty:125

APPROVED SUPPLIER

1/16 X 3/4 Cotter Pin Plated

#70701 | Pkg Qty:125

APPROVED SUPPLIER

.08Wd X 1 3/16" Long Hairpin Cotter Fits Hole 3/32"

#73503 | Pkg Qty:50

APPROVED SUPPLIER

1/4 X 2 Cotter Pin Plated

#70746 | Pkg Qty:50

APPROVED SUPPLIER

1/16 X 1/2 Cotter Pin Plated

#70700 | Pkg Qty:125

APPROVED SUPPLIER

1/8 X 2-1/2 Cotter Pin Plated

#70727 | Pkg Qty:125

APPROVED SUPPLIER

5/32 X 1-1/4 Cotter Pin Plated

#70731 | Pkg Qty:125

APPROVED SUPPLIER

3/32Wd X 1-5/8 Long Hairpin Cotter Fits Hole 7/64"

#73504 | Pkg Qty:50

APPROVED SUPPLIER

.062Wd 1/16X1 5/16L Hairpin Cotter Fits Hole 5/64"

#73502 | Pkg Qty:50

APPROVED SUPPLIER

.243Wd X 5" Lng Hairpin Cotter Fits Hole 1/4"

#73507 | Pkg Qty:10

APPROVED SUPPLIER

3/16 X 2-1/2 Cotter Pin Plated

#70741 | Pkg Qty:125

APPROVED SUPPLIER

1/16 X 1-1/4 Cotter Pin Plated

#70703 | Pkg Qty:125

APPROVED SUPPLIER

3/32Wd X 2-1/2 Long Hairpin Cotter Fits Hole 7/64"

#73508 | Pkg Qty:50

APPROVED SUPPLIER

Low Carbon Steel Extended Prong Cotter Pin, 1-3/4" L, 1/8" Pin Dia.

#70725 | Pkg Qty:125

APPROVED SUPPLIER

.042Wd X 1" Long Hair Pin Cotter Fits Hole 3/64"

#73501 | Pkg Qty:50

APPROVED SUPPLIER

1/4 X 1-1/2 Cotter Pin Plated

#70745 | Pkg Qty:50

APPROVED SUPPLIER

1/8 X 3/4 Cotter Pin Plated

#70721 | Pkg Qty:125

APPROVED SUPPLIER

1/4 X 2-1/2 Cotter Pin Plated

#70747 | Pkg Qty:50

APPROVED SUPPLIER

Carbon Steel Extended Prong Cotter Pin, 1-1/2" L, 7/64" Pin Dia.

#70718 | Pkg Qty:125

APPROVED SUPPLIER

1/8 X 3 Cotter Pin Plated

#70728 | Pkg Qty:125

APPROVED SUPPLIER

3/8 X 4 Cotter Pin Plated

#70764 | Pkg Qty:50

APPROVED SUPPLIER

Cotter Pin: Extended Prong, Low Carbon Steel, 1008, Zinc Plated, 3 in Fastener Lg, 50 PK

#925930-4 | Pkg Qty:50

$26.50 pkg | $0.53 ea

1 2 3 4 5

1 - 50 of 572 results

May we suggest

Item: 73563

Pkg Qty: 5

Hairpin Cotter .178WD X 3 3/4"

Item: 70709

Pkg Qty: 125

Cotter Pin 3/32 X 1

Item: 70724

Pkg Qty: 125

Cotter Pin 1/8 X 1-1/2

Item: 70726

Pkg Qty: 125

Cotter Pin 1/8 X 2

Item: 70734

Pkg Qty: 125

Cotter Pin 5/32 X 2

Item: 70732

Pkg Qty: 125

Cotter Pin 5/32 X 1-1/2

Item: 70711

Pkg Qty: 125

Cotter Pin 3/32 X 1-1/2

Item: 73505

Pkg Qty: 25

Hairpin Cotter .148WD X2 15/16

Item: 70722

Pkg Qty: 125

Cotter Pin 1/8 X 1

Item: 70740

Pkg Qty: 125

Cotter Pin 3/16 X 2

Item: 73561

Pkg Qty: 5

Hairpin Cotter .12WD X 2 3/8"

Item: 70713

Pkg Qty: 125

Cotter Pin 3/32 X 2

Item: 70739

Pkg Qty: 125

Cotter Pin 3/16 X 1-1/2

Item: 73562

Pkg Qty: 5

Hairpin Cotter .148WD X2 11/16

Item: 70748

Pkg Qty: 50

Cotter Pin 1/4 X 3

Item: 70762

Pkg Qty: 50

Cotter Pin 3/8 X 3

Item: 70702

Pkg Qty: 125

Cotter Pin 1/16 X 1

Item: 73506

Pkg Qty: 25

Hairpin Cotter .177WD X 3 3/4"

Item: 73509

Pkg Qty: 25

Hairpin Cotter .125 X 2-9/16

Item: 70716

Pkg Qty: 125

Cotter Pin 7/64 X 1

Item: 70771

Pkg Qty: 25

Cotter Pin 1/2 X 4

Item: 70756

Pkg Qty: 50

Cotter Pin 5/16 X 4

Item: 70742

Pkg Qty: 125

Cotter Pin 3/16 X 3

Item: 70764

Pkg Qty: 50

Cotter Pin 3/8 X 4

$7.75 pkg | $0.31 ea

Item: 914610

Pkg Qty: 25

Cotter Pin,Zinc,1/4x4 In L,Pk

Item: 70723

Pkg Qty: 125

Cotter Pin 1/8 X 1-1/4

Item: 24709

Pkg Qty: 1

Clevs Slip Hook 3/8 G70 W/Lat

Item: 73554

Pkg Qty: 5

Snap Pin 1/4X2-1/2

Item: 72314

Pkg Qty: 25

Hose Clamp #4 7/32 - 5/8

Item: 72301

Pkg Qty: 25

Hose Clamp #10 9/16 - 1 1/16

Item: 72305

Pkg Qty: 10

Hose Clamp #24 1 1/16 - 2

Item: 72336

Pkg Qty: 25

Hose Clamp #28 Lined

Item: 72306

Pkg Qty: 10

Hose Clamp #28 1 5/16 - 2 1/4

Item: 72302

Pkg Qty: 25

Hose Clamp #12 11/16 - 1 1/4

Item: 8852

Pkg Qty: 50

Rivet Nut Flange Knurl 10-24

Item: 73556

Pkg Qty: 5

Snap Pin 5/16X2-1/2

Item: 72300

Pkg Qty: 25

Hose Clamp #8 1/2 - 29/32

Item: 6536

Pkg Qty: 12

Imp Brake Parts Cleaner 14 Oz

Item: 91200

Pkg Qty: 5

A/B Push Union 1/4

Item: 71668

Pkg Qty: 10

Electrical Tape 3/4" X 60'

Item: 91201

Pkg Qty: 5

A/B Push Union 3/8

$94.24 pkg | $0.47 ea

Item: 918752-6

Pkg Qty: 200

Absorbent Pad,36 Gal. PK200

$10.93 pkg | $10.93 ea

Item: 260022-7

Pkg Qty: 1

Imperial 22" Beam Plus Wiper

$138.00 pkg | $11.50 ea

Item: 6522

Pkg Qty: 12

Blaster White Lithium Grease

$9.67 pkg | $9.67 ea

Item: 83722-7

Pkg Qty: 1

Imperial 22" Winter Wiper

$21.01 pkg | $21.01 ea

Item: 929415-1

Pkg Qty: 1

Cutting Oil,16 Oz,Squeeze

$56.97 pkg | $56.97 ea

Item: 913488-4

Pkg Qty: 1

Cord Set, In-Line GFCI,15 Amps

Item: 91000

Pkg Qty: 2

Core Insert For 500' Rolls

$35.36 pkg | $35.36 ea

Item: 919030-8

Pkg Qty: 1

Concrete Foundation Repair,10

Related Categories

Pins Clevis Pins Hitch Pins Safety Pins Roll Pins

What are the Benefits of Using Cotter Pins?

Using cotter pins can help to keep your machines safe and secure. They are designed to withstand wear and tear due to vibrations and can help to prevent rotary parts from becoming loose and falling off during use.

How Do Cotter Pins Work?

Cotter pins are inserted into holes in a castle nut or bolt with a hole, which then holds it in place on the shaft it is attached to. The cotter pin is then twisted to secure it in the hole and the ends of the pins are bent over to prevent it from coming loose. This ensures the fastener is securely locked in place.

What are Cotter Pins?

Cotter pins -also known as split pins - are thin metal pieces designed to lock castle nuts and fasteners in place on machine parts. They are simple yet extremely effective in preventing rotary parts from becoming loose and falling off during use.