Square-neck bolt lock washers are essential for preventing fasteners from loosening due to vibration or thermal expansion. Ensuring a secure connection is crucial in applications ranging from automotive repairs to structural assembly. Selecting the appropriate lock washer guarantees long-term stability and safety for your projects.
Looking for the best Square-Neck Bolt Lock Washers?
Discover now our comparison of the best Square-Neck Bolt Lock Washers. It is never easy to choose from the wide range of offers. On the market, you will find an incalculable number of models, all at different prices. And as you will discover, the best Square-Neck Bolt Lock Washers are not always the ones at the highest prices! Many criteria are used, and they make the richness and relevance of this comparison.
To help you make the best choice among the hundreds of products available, we have decided to offer you a comparison of the Square-Neck Bolt Lock Washers in order to find the best quality/price ratio. In this ranking, you will find products listed according to their price, but also their characteristics and the opinions of other customers. Also discover our comparisons by categories. You won’t have to choose your products at random anymore.
No. 1
1/2" x 3" Carriage Bolt of Square Neck with Nylon Lock nut and Large Size Washer Assortment Kit by Color...
- Size: Diameter 1/2 inch, Length 3 inch-13 pitch. Material: Made of high quality low carbon steel and color Galvanization to make Carriage bolts much more strength and Resistant to Rust. there are no issues of biting death or thread damaging to compare...
- Bolt, Nut and flat washer pack up together as one unit for conviences to end user with easy installation experiences.
- Nylon Insert Hex Lock Nut have more strong and long lifetime,full course for thread clamping force to avoid loose; large size flat washer apply for much more worse work conditions.
- Square neck underneath the round head feature as suit for their self-locking when position in square hole for nut tighting.
- This carriage bolt,nuts and washer Assortment Kit following up with ANSI standard and Our fasteners have passed many limit test requirements/quality control before selling out.please check the picture, size and self working condition requirements clearly...
No. 2
20 Sets 1/4-20 x 1/2" Carriage Bolt Kit, Round Head Square Neck, Black Carriage Bolts and Hex Nuts Set with...
- Thread Size: 1/4-20; Thread Pitch: 20 TPI; Thread Type: Coarse Thread; Screw Head Diameter: 0.58" (14.8mm); Round Head Height: 3.5mm; Length (including the neck): 1/2 inch.
- Package Include: 20 PCS 1/4-20 x 1/2" Carriage Bolts, 20 PCS 1/4"-20 Hex Nuts and 20 PCS 1/4" ID Flat Washers.
- Material: The Carriage bolts kits are made of carbon steel with black coating, which have greater strength and corrosion resistance performance than regular zinc plated fasteners.
- Feature: The carriage bolts have round heads and square necks. The square neck locks the square receiver hole to prevent rotation. The polished round head reduces surface protrusion and enhances the safety of connection and application.
- Wide Application: The Carriage Bolts Kits can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are also suitable for pergolas, fences, decks, furniture, wood-working and other projects.
No. 3
Matrelt 15 Sets 1/4"-20 x1-1/4 Carriage Bolts Round Head Square Neck Screws with Hex Nuts Flat Washers Spring...
- 【Size and Package】: 15pcs 1/4"-20 x1-1/4" Carriage Bolts ,15pcs 1/4"-20 Hex Nuts,15pcs Flat Washers,15pcs Spring Lock Washers,60pcs square neck bolts set are packaged in a transparent and sturdy plastic box.
- 【Corrosion-Resistant Material】-- Carriage bolts screws Hex nuts Flat washers Spring washers all are made from corrosion-resistant 304 stainless steel, Galvanizing by dipping made them have a tight, uniform, and thick silver zinc coating on surface,Has...
- 【Excellent combination】-- Carriage bolts’s head are smooth and shiny,Screwdriver cannot work on the bolt head, which has anti-theft effect. Bolts neck is square shaped, can be clamped onto the hole to fix the bolt, making it easy to tighten the nut...
- 【Wide Use】--Carriage bolt sets are commonly used in machinery, ships, building construction, furniture maintenance, and other scenarios that require high corrosion resistance, strength, and safety, such as heavy equipment, excavators...
- 【Efficient and convenient】Head square neck screws with Hex nuts Flat washers Spring lock washers complete set combination.The round head design and square neck of these carriage bolts enable a secure and self locking fit when appiled in square...
No. 4
Matrelt 8 Sets 5/16"-18 x2 Carriage Bolts Round Head Square Neck Screws with Hex Nuts Flat Washers Spring Lock...
- 【Size and Package】: 8pcs 5/16"-18 x2" Carriage Bolts ,8pcs 5/16"-18 Hex Nuts,8pcs Flat Washers,8pcs Spring Lock Washers,32pcs square neck bolts set are packaged in a transparent and sturdy plastic box.
- 【Corrosion-Resistant Material】-- Carriage bolts screws Hex nuts Flat washers Spring washers all are made from corrosion-resistant 304 stainless steel, Galvanizing by dipping made them have a tight, uniform, and thick silver zinc coating on surface,Has...
- 【Excellent combination】-- Carriage bolts’s head are smooth and shiny,Screwdriver cannot work on the bolt head, which has anti-theft effect. Bolts neck is square shaped, can be clamped onto the hole to fix the bolt, making it easy to tighten the nut...
- 【Wide Use】--Carriage bolt sets are commonly used in machinery, ships, building construction, furniture maintenance, and other scenarios that require high corrosion resistance, strength, and safety, such as heavy equipment, excavators...
- 【Efficient and convenient】Head square neck screws with Hex nuts Flat washers Spring lock washers complete set combination.The round head design and square neck of these carriage bolts enable a secure and self locking fit when appiled in square...
No. 5
15 Sets 1/4-20 x 2 Carriage Bolt Kit, Round Head Square Neck, Black Carriage Bolts and Hex Nuts Set with Flat...
- Thread Size: 1/4-20; Thread Pitch: 20 TPI; Thread Type: Coarse Thread; Screw Head Diameter: 0.58" (14.8mm); Round Head Height: 0.12" (3.2mm); Length (including the neck): 2 inch.
- Package Include: 15 PCS 1/4-20 x 2" Carriage Bolts, 15 PCS 1/4"-20 Hex Nuts and 15 PCS 1/4" ID Flat Washers.
- Material: The Carriage bolts kits are made of carbon steel with black coating, which have greater strength and corrosion resistance performance than regular zinc plated fasteners.
- Feature: The carriage bolts have round heads and square necks. The square neck locks the square receiver hole to prevent rotation. The polished round head reduces surface protrusion and enhances the safety of connection and application.
- Wide Application: The Carriage Bolts Kits can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are also suitable for pergolas, fences, decks, furniture, wood-working and other projects.
No. 6
Metalsuberg 1/4" x 1" Carriage Bolt by Color Galvanization of Square Neck with Nylon Lock nut and Large Size...
- Size: Diameter 1/4 inch, Length 1 inch-20 pitch. Material: Made of high quality low carbon steel and color Galvanization to make Carriage bolts much more strength and Resistant to Rust. there are no issues of biting death or thread damaging to compare...
- Bolt,Nut and flat washer pack up together as one unit for conviences to end user with easy installation experience.
- Nylon Insert Hex Lock Nut have more strong and long lifetime for full course thread clamping force to avoid loose; Large size flat washer apply for much more worse work conditions.
- Square neck underneath the round head feature as suit for their self-locking when position in square hole for nut tighting.
- This carriage bolt,nut and washer Assortment Kit following up with ANSI standard and Our fasteners have passed many limit test requirements/quality control before selling out.please check the picture, size and self working condition requirements clearly...
SaleNo. 7
Krysay 1/4-20 x 1-1/4" Carriage Bolts 304 Stainless Steel 18-8,Round Head Square Neck (26Sets) Bolts and Nuts...
- Bolts and Nuts Kit :These 1/4-20 x 1-1/4" carriage Bolts slip resistant efficiency,with square neck beneath the round head locks firmly into pre-drilled holes or wood, preventing rotation during assembly, ensuring stable fastening,square neck reduces...
- Durable Construction:carriage bolts 1/4 are made from 304 stainless steel 18-8,High rust-proof performance,ideal for humid or chemical environments.offering tensile strength of 70,000–150,000 psi.
- Wide Compatibility:suitable for diverse industrial and DIY projects.wooden beams, decking, and structural frameworks,chair/table assembly with hidden fastening and anti-loosening benefits,heavy-duty machinery maintenance due to vibration...
- Easy to use:Pre-drill a hole matching the 1/4 20 stainless steel bolts,push the square neck into the material until the head sits flush,Tighten the nut.
- Bolts Nuts Washers Kit:You can get 26 sets 1/4-20 x 1-1/4" stainless carriage bolts,package includes matching hexagonal nuts and flat washers.Thread Diameter:1/4"; Thread Pitch:1/20"; Screw Length: 1-1/4 In; Head Diameter, 0.59". Complies with ANSI/ASME...
−10%
$8.99
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No. 8
Yinpecly 10 Sets 5/16-18 x 3" Carriage Bolts Screws, 304 Stainless Steel Round Head Square Neck Carriage Bolts...
- Package Includes: 10 Pcs Carriage Bolts (5/16-18 x 3"), 10 Pcs Hex Nuts (5/16"-18), 10 Pcs 5/16" ID Flat Washers and 10 PCS 5/16" ID Spring Lock Washers
- Thread Size: 5/16-18; Thread Pitch: 18 TPI; Thread Type: Coarse Thread
- Material: Carriage Bolts are made of 304 stainless steel, the carriage bolts and nuts kit is strong and reliable, resistant to corrode, making them suitable for both indoor and outdoor applications
- Well Made Carriage Bolts: All of the stainless steel bolts and hex nuts and flat washers are well manufactured with no burs, smooth-symmetrical head, precise and clean threads
- Application: Carriage bolts aren't just for carriages, these bolts can be used on wood projects, timber frame shed build, trailer deck boards, deck project, outdoor bench seat rebuild, etc.
No. 9
Matrelt 8 Sets 5/16"-18 x1-1/2 Carriage Bolts Round Head Square Neck Screws with Hex Nuts Flat Washers Spring...
- 【Size and Package】: 8pcs 5/16"-18 x1-1/2" Carriage Bolts ,8pcs 5/16"-18 Hex Nuts,8pcs Flat Washers,8pcs Spring Lock Washers,32pcs square neck bolts set are packaged in a transparent and sturdy plastic box.
- 【Corrosion-Resistant Material】-- Carriage bolts screws Hex nuts Flat washers Spring washers all are made from corrosion-resistant 304 stainless steel, Galvanizing by dipping made them have a tight, uniform, and thick silver zinc coating on surface,Has...
- 【Excellent combination】-- Carriage bolts’s head are smooth and shiny,Screwdriver cannot work on the bolt head, which has anti-theft effect. Bolts neck is square shaped, can be clamped onto the hole to fix the bolt, making it easy to tighten the nut...
- 【Wide Use】--Carriage bolt sets are commonly used in machinery, ships, building construction, furniture maintenance, and other scenarios that require high corrosion resistance, strength, and safety, such as heavy equipment, excavators...
- 【Efficient and convenient】Head square neck screws with Hex nuts Flat washers Spring lock washers complete set combination.The round head design and square neck of these carriage bolts enable a secure and self locking fit when appiled in square...
No. 10
3/8" x 5" Carriage Bolt of Square Neck and Nylon Lock nut Large Size Washer Assortment Kit by Color...
- Size: Diameter 3/8 inch, Length 5 inch-16 pitch. Material: Made of high quality low carbon steel and color Galvanization to make Carriage bolts much more strength and Resistant to Rust. there are no issues of biting death or thread damaging to compare...
- Bolt, Nut and flat washer pack up together as one unit for conviences to end user with easy installation experiences.
- Nylon Insert Hex Lock Nut have more strong and long lifetime,full course for thread clamping force to avoid loose; large size flat washer apply for much more worse work conditions.
- Square neck underneath the round head feature as suit for their self-locking when position in square hole for nut tighting.
- This carriage bolt,nut and washer Assortment Kit following up with ANSI standard and Our fasteners have passed many limit test requirements/quality control before selling out.please check the picture, size and self working condition requirements clearly...
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Last update on 2026-04-10 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Square-Neck Bolt Lock Washers
Material
- Steel: Most common and offers good strength and durability for general use. Look for plated steel (like zinc or cadmium) for corrosion resistance.
- Stainless Steel: Ideal for environments prone to rust or moisture, offering superior corrosion resistance.
Size and Fitment
- Bolt Diameter: The inner diameter of the lock washer should match the bolt's diameter. Common sizes correspond to standard bolt sizes (e.g., 1/4 inch, 3/8 inch, 1/2 inch).
- Washer Thickness: Thicker washers may provide more resistance to loosening but can add bulk. Ensure the washer is compatible with your existing hardware.
Application
- Vibration Resistance: For high-vibration environments, consider heavier-duty or specialized designs that offer enhanced locking capabilities.
- Environmental Factors: If the application involves extreme temperatures or corrosive substances, opt for materials like stainless steel or specialized coatings.
Frequently Asked Questions
What is the purpose of a square-neck bolt lock washer?
These washers are designed to prevent nuts and bolts from loosening under vibration or thermal cycling. The square neck digs into the surface, providing a locking action that resists rotation.
How do I determine the correct size washer?
The correct size is determined by the diameter of the bolt or screw it will be used with. The inner diameter of the lock washer should closely match the bolt's nominal size.
Can I reuse lock washers?
While some may be reusable, it's generally recommended to use new lock washers for critical applications. Repeated use can reduce their effectiveness and ability to provide a secure lock.
Are there different types of square-neck lock washers?
Yes, they primarily vary in material (steel, stainless steel), plating for corrosion resistance, and thickness. Some may also have slightly different neck designs for specific applications.