Screws and Bolts

49253 Products
Cap Screws
Cap Screws
cap screws are essential components in many industrial, commercial, and even DIY projects due to their strength, reliability, and versatility.
Rounded Head Screws
Rounded Head Screws
These screws are commonly used in applications where aesthetics and minimal protrusion are important, such as furniture, electronics, and decorative fixtures.
Hex Head Screws
Hex Head Screws
Browse LILY Bearing's [SEOstr] hex head screws by thread size, length, and material — full specs and pricing on every SKU.
Flat Head Screws
Flat Head Screws
Flat head screws are fasteners designed to sit flush or below the surface, providing a smooth finish, commonly used in woodworking, construction, and metalworking applications.
Tapping Screws
Tapping Screws
Tapping screws are a type of self-threading fastener designed to cut or form their own threads as they are driven into a material. These screws are versatile and commonly used for securing materials like metal, wood, plastic, and composites without the need for pre-tapped holes.
Shoulder Screws
Shoulder Screws
This design provides a precise bearing surface, allowing the screw to function as a pivot or support in various applications. They are commonly used in machinery, assemblies, and devices where precise alignment and rotational movement are required.
Set Screws
Set Screws
Browse LILY Bearing's [SEOstr] set screws by thread size, length, and material — full specs and pricing on every SKU.
Thumb Screws
Thumb Screws
They are commonly used in applications where frequent adjustments are needed or where ease of removal is important. They come in various materials, including stainless steel, steel, brass, and aluminum, and can have different head styles such as knurled, flared-collar, and low-profile.
Carriage Bolts
Carriage Bolts
Browse LILY Bearing's [SEOstr] carriage bolts by thread size, length, and material — full specs and pricing on every SKU.
12-Point Screws
12-Point Screws
12-point screws are compatible with standard 12-point box wrenches or sockets. The 12-point design provides more points of contact with the tool, distributing torque evenly and reducing the risk of rounding the screw head under high torque conditions.
Captive Panel Screws
Captive Panel Screws
[SEOstr] Captive panel screws are fasteners that are permanently secured to a panel or door, typically with the help of a retaining mechanism, such as a shoulder or a retainer washer.
Threaded Rods and Studs
Threaded Rods and Studs
Threaded rods are long, continuous rods with external threads used for adjustable length connections, while studs are shorter fasteners with threads on the ends or part of their length, designed for secure connections with nuts or other fasteners.

Screws and Bolts for Industrial Assembly

LILY supplies screws and bolts for machine assembly, equipment maintenance and component retention. Compare the categories below, then use the product filters and drawings to confirm the specification.

 

Choose a Fastener by Function

Category Head or Key Feature Typical Use Selection Check
Hex Head Screws External hex head Machine frames and general clamping joints Wrench clearance, thread length and strength rating
Socket Head Cap Screws Cylindrical head with internal hex or Torx drive Fixtures and closely spaced assemblies Head clearance, drive size and product load rating
Flat Head Screws Countersunk head Flush mounting in a matching countersink Countersink angle, head diameter and seating depth
Rounded Head Screws Pan, button, truss and related raised-head styles Covers and panels where the head may project above the surface Head height, bearing area and drive access
Tapping Screws Forms or cuts a mating thread Suitable pilot holes in metal or plastic Substrate, thickness and required pilot-hole size
Shoulder Screws Unthreaded shoulder with a smaller threaded end Pivots, guides and moving linkages Shoulder diameter, shoulder length and thread engagement
Set Screws Usually headless, with a shaft-contacting point Positioning or retaining collars, pulleys and gears Point style, shaft surface and required holding capacity
Thumb Screws Head designed for hand tightening Covers and adjustments requiring frequent access Grip space and whether controlled preload is required
Carriage Bolts Domed head and square neck Nut-tightened wood joints or suitable square holes in metal Square-neck fit, grip length and matching nut
12-Point Screws External 12-point head Specified machinery joints with compatible tool access Head dimensions, tool fit and specified strength rating
Captive Panel Screws Retainer keeps the screw attached to a panel Access panels where loose fasteners are undesirable Panel thickness, mounting method and screw travel
Threaded Rods and Studs Headless, with full-length or end threads Adjustable connections, tie rods and stud assemblies Thread engagement, end-thread arrangement and strength rating

For a visual comparison of head shapes, drives and applications, see our types of screws and bolts guide.

 

Select Material and Strength

Stainless steel screws and bolts are available in several material grades, including 18-8 and 316. Compared with common 304 / 18-8 grades, 316 stainless steel screws and bolts generally offer better resistance to chloride-induced pitting. Assess the actual exposure; stainless steel is not immune to corrosion.

Steel and alloy-steel fasteners are available with different grades and finishes. Brass, bronze, aluminum and other materials are available in selected product families. Nylon and other plastic screws and bolts can provide electrical insulation and low weight; check temperature, creep and allowable load before replacing a metal fastener.

For any material, confirm the exact part’s specified strength and finish. Corrosion resistance alone does not establish load capacity.

 

Check Thread Size, Length and Mating Parts

Match the measurement system, nominal diameter, pitch or threads per inch, and thread direction. Inch and metric threads are not interchangeable. Check whether the fastener is fully or partially threaded and whether the available engagement suits the joint.

Also check head clearance, drive size and the drawing’s length convention. A flat countersunk screw is generally measured including its head; most raised-head screws are measured from beneath the head. Shoulder screws require separate shoulder dimensions.

When selecting screws, bolts and nuts, confirm matching threads and appropriate mechanical ratings. Select washers for the required bearing area, clearance and material. For tapped-hole versus nut-tightened assemblies, read our bolt vs screw comparison.

 

Standard and Custom Screws and Bolts: Request a Quote

For standard parts, provide a part number or complete fastener callout. For non-standard lengths, body diameters or tolerances, use LILY’s custom fastener services.

Include dimensions, the required standard or strength grade, material, finish, quantity and operating conditions. State any documentation or inspection requirements with the enquiry, and attach a drawing when available.

For help confirming a specification or reviewing an application, contact us.

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