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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.
【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...
Size: Diameter 3/8 inch, Length 6 inch-16 pitch. Material: Made of high quality low carbon steel and color Galvanization to make Carriage bolts much more strength and Antirust. there are no issues of thread stuck damaging to compare with nonrust steel...
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 on vibriation,shocking,earthquake situation; 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...
【Size and Package】: 8pcs 1/4"-20 x4" Carriage Bolts ,8pcs 1/4"-20 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...
Bolts and Nuts Kit :These 5/16-18 x 1-1/2" 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 5/16 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 5/16 18 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 16 sets 5/16-18 x 1-1/2" stainless carriage bolts,package includes matching hexagonal nuts and flat washers.Thread Diameter:5/16"; Thread Pitch:1/18"; Screw Length: 1-1/2 In; Head Diameter, 0.71". Complies with ANSI/ASME...
【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...
Specification Options for Versatile Use: the galvanized carriage bolt offers size like 1/2" x 1-1/2" to meet installation need; Complying with ansi standards, these bolts fit most industry hole sizes and work with wood, metal, and plastic; Suitable for...
Material Enhanced Durability: these carriage bolts (bolts grade 2) are made of carbon steel with galvanization bolts treatment; The galvanized coating creates a protective barrier, making them rust resistant bolts that resist corrosion and thread damage...
All-in-one Packaging for Hassle-free Use: this galvanization fastener kit is one unit bolts, integrating carriage bolts, nylon lock nuts, and large flat washers; The 10 pcs bolts set eliminates separate accessory purchases, saving time on finding...
Square Neck Design for Self-locking Convenience: with the classic square neck bolt structure, the square neck under the round head locks firmly in square holes during installation; No extra tools are needed to hold the bolt while tightening the nut...
Anti-loose Performance for Stable Fixation: our anti-loose bolt kit includes nylon insert hex lock nuts that deliver strong, lasting clamping force on full-course threads; These anti-loose bolts prevent loosening from vibration or impact, securing...
Size: Diameter 1/2 inch, Length 2-1/2 inch-13 pitch. Material: Made of high quality low carbon steel and color Galvanization to make Carriage bolts much more strength and Antirust. there are no issues of thread stuck damaging to compare with nonrust steel...
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 on vibriation,shocking,earthquake situation; 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...
Size: Diameter 1/2 inch, Length 1-1/2 inch-13 pitch. Material: Made of high quality low carbon steel and color Galvanization to make Carriage bolts much more strength and Antirust. there are no issues of thread stuck damaging to compare with nonrust steel...
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 on vibriation,shocking,earthquake situation; 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...
Size: Diameter 1/2 inch, Length 6 inch-13 pitch. Material: Made of high quality low carbon steel and color Galvanization to make Carriage bolts much more strength and Antirust. there are no issues of thread stuck damaging to compare with nonrust steel...
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 on vibriation,shocking,earthquake situation; 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...
Last update on 2026-07-18 / 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.
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