Cotter Pins

Uses item details. Price when purchased online

Qenwkxz 420PCS Cotter Pin Assortment Kit Assorted Sizes Cotter Pin Clip Key Fastener Fitting Assortment Kit Split Pin Fastener Clips Silver Stainless Steel Was $17.99

Qenwkxz 420PCS Cotter Pin Assortment Kit Assorted Sizes Cotter Pin Clip Key Fastener Fitting Assortment Kit Split Pin Fastener Clips Silver Stainless Steel

Qenwkxz 420PCS Cotter Pin Assortment Kit Assorted Sizes Cotter Pin Clip Key Fastener Fitting Assortment Kit Split Pin Fastener Clips Silver Stainless Steel

4.7 out of 5 Stars. 18 reviews
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Titan Industrial Supply 150-Piece Cotter Pin Assortment $16.99

Titan Industrial Supply 150-Piece Cotter Pin Assortment
current price $16.99

Titan Industrial Supply 150-Piece Cotter Pin Assortment

Uxcell Carbon Steel R Shaped Spring Cotter Clip Pin Fastener Hardware Silver Tone 20Pcs 2mm x 43m From $7.89

Uxcell Carbon Steel R Shaped Spring Cotter Clip Pin Fastener Hardware Silver Tone 20Pcs 2mm x 43m
Available in additional 4 options
From$789

Uxcell Carbon Steel R Shaped Spring Cotter Clip Pin Fastener Hardware Silver Tone 20Pcs 2mm x 43m

4.4 out of 5 Stars. 9 reviews

Speed Fast Cotter Pin Assortment Kit $32.48 $32.48/count

Speed Fast Cotter Pin Assortment Kit
current price $32.48
$32.48/count

Speed Fast Cotter Pin Assortment Kit

5 out of 5 Stars. 3 reviews

Performance Tool W5205 560pc Cotter Pin Assortment $17.59

Performance Tool W5205 560pc Cotter Pin Assortment
current price $17.59

Performance Tool W5205 560pc Cotter Pin Assortment

Manufacturer Varies Cotter Pin,1/8 in dia,2.375 in L,PK50 WWG-BP-2106-L $20.52

Manufacturer Varies Cotter Pin,1/8 in dia,2.375 in L,PK50 WWG-BP-2106-L
current price $20.52

Manufacturer Varies Cotter Pin,1/8 in dia,2.375 in L,PK50 WWG-BP-2106-L

5 out of 5 Stars. 1 reviews

Manufacturer Varies Bridge Cotter Pin, 3/32 in Dia, 3 in L, Steel, PK 25 2UJL9 $15.29 Was $17.99

Manufacturer Varies Bridge Cotter Pin, 3/32 in Dia, 3 in L, Steel, PK 25 2UJL9
current price Now $15.29, Was $17.99

Manufacturer Varies Bridge Cotter Pin, 3/32 in Dia, 3 in L, Steel, PK 25 2UJL9

Uxcell 8-Pack Brooch Shape Cotter Safety Pin, M3.2x80mm Spring Steel Pins Quick Lock Brooch Fastener Heavy Retainer Clips $12.49

Uxcell 8-Pack Brooch Shape Cotter Safety Pin, M3.2x80mm Spring Steel Pins Quick Lock Brooch Fastener Heavy Retainer Clips
current price $12.49

Uxcell 8-Pack Brooch Shape Cotter Safety Pin, M3.2x80mm Spring Steel Pins Quick Lock Brooch Fastener Heavy Retainer Clips

Performance Tools W5204 1000 Piece Cotter Pin Assortment $27.99 Was $32.99

Performance Tools W5204 1000 Piece Cotter Pin Assortment
current price Now $27.99, Was $32.99

Performance Tools W5204 1000 Piece Cotter Pin Assortment

Reduced price Split Cotter Pin -5mm x 80mm 304 Stainless Steel 2-Prongs Silver Tone 2Pcs $6.49 Was $9.44

Split Cotter Pin -5mm x 80mm 304 Stainless Steel 2-Prongs Silver Tone 2Pcs
current price Now $6.49, Was $9.44

Split Cotter Pin -5mm x 80mm 304 Stainless Steel 2-Prongs Silver Tone 2Pcs

SIEYIO 160Pcs Stainless Steel Cotter Pin Assortment with Assortment Box Cotter Pin Set in 6 Different Size Cotter Pin $16.29

SIEYIO 160Pcs Stainless Steel Cotter Pin Assortment with Assortment Box Cotter Pin Set in 6 Different Size Cotter Pin
current price $16.29

SIEYIO 160Pcs Stainless Steel Cotter Pin Assortment with Assortment Box Cotter Pin Set in 6 Different Size Cotter Pin

560 Piece Cotter Pin Assortment $20.46 Was $26.61

560 Piece Cotter Pin Assortment
current price Now $20.46, Was $26.61

560 Piece Cotter Pin Assortment

Cotter Pin Assortment, Steel, Zinc Plated, 100 Pcs $32.48

Cotter Pin Assortment, Steel, Zinc Plated, 100 Pcs
current price $32.48

Cotter Pin Assortment, Steel, Zinc Plated, 100 Pcs

Performance Tool W5205 560pc Cotter Pin Assortment From $11.97

Performance Tool W5205 560pc Cotter Pin Assortment
Available in additional 3 options
From$1197

Performance Tool W5205 560pc Cotter Pin Assortment

3.5 out of 5 Stars. 4 reviews
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Split Cotter Pin -4mm x 68mm 304 Stainless Steel 2-Prongs Silver Tone 2Pcs $6.99

Split Cotter Pin -4mm x 68mm 304 Stainless Steel 2-Prongs Silver Tone 2Pcs
current price $6.99

Split Cotter Pin -4mm x 68mm 304 Stainless Steel 2-Prongs Silver Tone 2Pcs

10 Cotter Pins (Size 1.2x22mm to 3x65mm) Tractor Pin Clips, Stainless Steel Fastener - , 1.2x22mm From $9.16

10 Cotter Pins (Size 1.2x22mm to 3x65mm) Tractor Pin Clips, Stainless Steel Fastener - , 1.2x22mm
Available in additional 2 options
From$916

10 Cotter Pins (Size 1.2x22mm to 3x65mm) Tractor Pin Clips, Stainless Steel Fastener - , 1.2x22mm

420x Stainless Steel Cotter Pin Assortment Kit Durable Reliable Fasteners for Automotive and Machinery $17.72

420x Stainless Steel Cotter Pin Assortment Kit Durable Reliable Fasteners for Automotive and Machinery
current price $17.72

420x Stainless Steel Cotter Pin Assortment Kit Durable Reliable Fasteners for Automotive and Machinery

1 out of 5 Stars. 1 reviews

K-Tool 75 555-pc Cotter Pin Assortment (6 sizes) $27.45 $27.45/count

K-Tool 75 555-pc Cotter Pin Assortment (6 sizes)
current price $27.45
$27.45/count

K-Tool 75 555-pc Cotter Pin Assortment (6 sizes)

5 out of 5 Stars. 1 reviews

SE .12" x 2-3/4" Cotter Pins (10-Pack) - HP3M-10 $12.99

SE .12" x 2-3/4" Cotter Pins (10-Pack) - HP3M-10
current price $12.99

SE .12" x 2-3/4" Cotter Pins (10-Pack) - HP3M-10

1.6mm x 28mm R Pins Spring Cotter Clip Hardware Silver Tone 20 Pcs $8.11

1.6mm x 28mm R Pins Spring Cotter Clip Hardware Silver Tone 20 Pcs
current price $8.11

1.6mm x 28mm R Pins Spring Cotter Clip Hardware Silver Tone 20 Pcs

100Pcs R Cotter Pins Tractor Pin Clips with Plastic Box Assortment Kit Fastener Clip Set $11.90 Was $14.29

100Pcs R Cotter Pins Tractor Pin Clips with Plastic Box Assortment Kit Fastener Clip Set
current price Now $11.90, Was $14.29

100Pcs R Cotter Pins Tractor Pin Clips with Plastic Box Assortment Kit Fastener Clip Set

4.5 out of 5 Stars. 2 reviews

Assorted Large Nickel Plated Steel Cotter Pins 144 Pc Kit $18.99

Assorted Large Nickel Plated Steel Cotter Pins 144 Pc Kit
current price $18.99

Assorted Large Nickel Plated Steel Cotter Pins 144 Pc Kit

Dorman 135-417BX Cotter Pins- 1/8 In. x 1-3/4 In. (M3.2 x 44mm) (Pack of 40) $7.78

Dorman 135-417BX Cotter Pins- 1/8 In. x 1-3/4 In. (M3.2 x 44mm) (Pack of 40)
current price $7.78

Dorman 135-417BX Cotter Pins- 1/8 In. x 1-3/4 In. (M3.2 x 44mm) (Pack of 40)

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Cotter Pin Assortments, Steel, 600 per set $72.02

Cotter Pin Assortments, Steel, 600 per set
current price $72.02

Cotter Pin Assortments, Steel, 600 per set

YARDMAX YBSP2 Shear Pins and Cotter Pins $10.09

YARDMAX YBSP2 Shear Pins and Cotter Pins
current price $10.09

YARDMAX YBSP2 Shear Pins and Cotter Pins

5 out of 5 Stars. 1 reviews
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1.8mm x 32mm Carbon Steel R Shaped Spring Cotter Clip Pin Fastener 100 Pcs $11.99

1.8mm x 32mm Carbon Steel R Shaped Spring Cotter Clip Pin Fastener 100 Pcs
current price $11.99

1.8mm x 32mm Carbon Steel R Shaped Spring Cotter Clip Pin Fastener 100 Pcs

Dorman 799420D Pro Pack Cotter Pins, Clear $25.89

Dorman 799420D Pro Pack Cotter Pins, Clear
current price $25.89

Dorman 799420D Pro Pack Cotter Pins, Clear

TITAN 144-PC LARGE COTTER PIN ASSORTMENT $24.49 $24.49/count

TITAN 144-PC LARGE COTTER PIN ASSORTMENT
current price $24.49
$24.49/count

TITAN 144-PC LARGE COTTER PIN ASSORTMENT

Tebru R Cotter, R Cotter Pin Retaining Pin Fastening Clip Bright Zinc Plated 4 Sizes 1.6/1.8/2/2.5mm, R Clip

Tebru R Cotter, R Cotter Pin Retaining Pin Fastening Clip Bright Zinc Plated 4 Sizes 1.6/1.8/2/2.5mm, R Clip

Tebru R Cotter, R Cotter Pin Retaining Pin Fastening Clip Bright Zinc Plated 4 Sizes 1.6/1.8/2/2.5mm, R Clip

5 out of 5 Stars. 1 reviews
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100PCS Cotter Pin Assortment Set for Tractors, Cars, and Machinery $13.93

100PCS Cotter Pin Assortment Set for Tractors, Cars, and Machinery
current price $13.93

100PCS Cotter Pin Assortment Set for Tractors, Cars, and Machinery

Cotter Pin Set 144 Pieces Metal Fastener Maintenance Securing Assorted Ring Head $17.99

Cotter Pin Set 144 Pieces Metal Fastener Maintenance Securing Assorted Ring Head
current price $17.99

Cotter Pin Set 144 Pieces Metal Fastener Maintenance Securing Assorted Ring Head

KarParts360 Multi-Purpose Cotter Pin | 50 Pieces | Steel Material | Zinc-Plated/Natural Finish | Pins/Rings/Clips Fastener Category $18.57

KarParts360 Multi-Purpose Cotter Pin | 50 Pieces | Steel Material | Zinc-Plated/Natural Finish | Pins/Rings/Clips Fastener Category
current price $18.57

KarParts360 Multi-Purpose Cotter Pin | 50 Pieces | Steel Material | Zinc-Plated/Natural Finish | Pins/Rings/Clips Fastener Category

8000 0.5 To 1.5 in. Tool Box Cotter Pins, 50 Pack $20.33

8000 0.5 To 1.5 in. Tool Box Cotter Pins, 50 Pack
current price $20.33

8000 0.5 To 1.5 in. Tool Box Cotter Pins, 50 Pack

Dorman 784-622D Cotter Pin Assortment - 3/32 In. X 1 In., 1-1/2 In. X 2 In. (Pack of 12) $6.20

Dorman 784-622D Cotter Pin Assortment - 3/32 In. X 1 In., 1-1/2 In. X 2 In. (Pack of 12)
current price $6.20

Dorman 784-622D Cotter Pin Assortment - 3/32 In. X 1 In., 1-1/2 In. X 2 In. (Pack of 12)

3.7 out of 5 Stars. 3 reviews
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Swordfish 31100 - 144pc Cotter Pin Assortment $24.98

Swordfish 31100 - 144pc Cotter Pin Assortment
current price $24.98

Swordfish 31100 - 144pc Cotter Pin Assortment

5 out of 5 Stars. 1 reviews

KarParts360 Multi-Purpose Cotter Pin | 40 Pieces | Zinc-Plated/Natural Finish | Steel Material | Pins/Rings/Clips Fastener Category $19.57

KarParts360 Multi-Purpose Cotter Pin | 40 Pieces | Zinc-Plated/Natural Finish | Steel Material | Pins/Rings/Clips Fastener Category
current price $19.57

KarParts360 Multi-Purpose Cotter Pin | 40 Pieces | Zinc-Plated/Natural Finish | Steel Material | Pins/Rings/Clips Fastener Category

6 Sets Shear Cotter Pins Replacement Part Shear Pins Shear Pin Replacement $7.98

6 Sets Shear Cotter Pins Replacement Part Shear Pins Shear Pin Replacement
current price $7.98

6 Sets Shear Cotter Pins Replacement Part Shear Pins Shear Pin Replacement

5 out of 5 Stars. 1 reviews

345Pcs 304 Stainless Steel Cotter Pin Assortment Kit M1.6/M2.5/M3.2/ 6 Sizes for Car,Lawn Mowers $18.45

345Pcs 304 Stainless Steel Cotter Pin Assortment Kit M1.6/M2.5/M3.2/ 6 Sizes for Car,Lawn Mowers
current price $18.45

345Pcs 304 Stainless Steel Cotter Pin Assortment Kit M1.6/M2.5/M3.2/ 6 Sizes for Car,Lawn Mowers

Dorman 135-520 Cotter Pin Natural/Zinc-Plated (Pack of 100) $9.42

Dorman 135-520 Cotter Pin Natural/Zinc-Plated (Pack of 100)
current price $9.42

Dorman 135-520 Cotter Pin Natural/Zinc-Plated (Pack of 100)

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Hairpin Cotter Pins $20.76

Hairpin Cotter Pins
current price $20.76

Hairpin Cotter Pins

FAQ

What are cotter pins used for?

Cotter pins are simple retainers that help keep parts from sliding off or loosening during use. You’ll see them used across automotive, lawn and garden equipment, trailers, and general machinery.

  • Hold nuts in place: Often used with a castellated nut to keep it from backing off.
  • Secure clevis or hitch pins: Prevent pins from working their way out of a hole or bracket.
  • Quick, tool-light fastening: Many styles install with basic pliers or by hand.

Choosing a style (split pin, hairpin/R-clip, or safety-pin style) depends on the application. Always follow your equipment manual for size and placement.

Cotter pin vs shear pin—what's the difference?

They do different jobs:

  • Cotter pin: A retainer. It’s designed to keep a nut, clevis pin, or similar hardware from moving out of position. It relies on bent legs (split pin) or spring tension (R-clip) and isn’t intended to carry significant load.
  • Shear pin: A sacrificial fastener. It’s designed to break at a specific force to protect equipment (common in machinery and some outdoor power tools).

Because their purposes differ, they’re generally not interchangeable. If a manual specifies a shear pin, using a cotter pin instead may not provide the intended protection. When in doubt, check your equipment documentation.

What are the main types of cotter pins?

You’ll commonly find three broad types on this page:

  • Split cotter pins (two-prong): Insert through a hole, then bend the legs to lock a nut or pin.
  • Hairpin cotter/R-clips: Springy, R-shaped clips that slide into a cross-hole or groove, great for quick install and removal.
  • Safety-pin style locking cotters: A clasped design (similar to a brooch safety pin) that snaps shut for a secure closure.

Each has pros and cons. Split pins are very secure but single-use; R-clips are fast to remove; safety-pin styles offer a positive latch. Match the style to your task and follow the equipment’s guidance.

How do cotter pins stay in place?

They hold by either mechanical deformation or spring tension:

  • Split pins: Insert the pin through the hole, then bend the two legs in opposite directions around the fastener. The bent legs help prevent backing out.
  • R-clips/hairpins: The spring shape presses against the pin or groove to create friction and retention.
  • Safety-pin styles: A latch closes to keep the pin captured.

Fit matters. Choosing the right diameter and length helps the pin seat properly. Light hand tools (like pliers) can assist with bending, and a quick tug test can help confirm it’s seated. Always follow the equipment manual.

What cotter pin size should I buy?

Start with the hole and environment, then choose material and length:

  • Diameter: Measure the hole or pin groove. For split pins, pick a diameter that fits the hole without forcing. For R-clips, select a size that matches the receiving pin’s diameter/groove.
  • Length: Long enough to bend legs securely (split pins) or to fully engage (R-clips), but not so long it snags.
  • Material/finish: Stainless steel can be a good option for damp or outdoor use, while zinc-plated steel may suit general indoor or light-duty applications.

If you’re unsure, an assortment kit can provide multiple sizes to test fit.

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