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Machine Screw

Machine Screw

Engineered for Performance • Manufactured to Tight Tolerances • Available in Standard & Custom Specifications
At Jiliang, we engineer precision‑ground machine screws that stand up to the most demanding industrial applications. With 17 years of experience, our screws deliver unparalleled strength, tolerance accuracy (±0.02 mm), and long‑term reliability—even under high‑vibration or corrosive environments. We guarantee consistent hardness, uniform coating, and perfect thread engagement on every lot. Whether you are in construction, manufacturing, or DIY projects.From standard sizes to customized options, we provide a diverse selection that meets every requirement. Choose our machine screws to ensure quality and efficiency in your projects.

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Why Choose Us as Your Machine Screw Supplier?

Extensive Product Range

We offer a comprehensive selection of machine screw in various sizes, materials, thread types, and head styles. Whether you need precision miniature screws or heavy-duty fasteners, our inventory is designed to meet the exact requirements of your application.

Uncompromising Quality

Our machine screws are manufactured to meet or exceed industry standards such as ISO, DIN, ANSI, and JIS. Each product undergoes strict quality control inspections to ensure dimensional accuracy, tensile strength, and corrosion resistance.

Custom Solutions Available

Need something specific? We provide custom machine screws tailored to your project’s specifications—whether it’s a unique material, coating, or threading configuration. Our engineering team works closely with you to deliver the ideal fastening solution.

Reliable Lead Times and On-Time Delivery

With efficient logistics, real-time inventory tracking, and a commitment to on-time delivery, we help you keep your operations running smoothly.Lead time as low as 5–7 days for orders.

Competitive Pricing Without Compromise

Through optimized manufacturing processes and strategic sourcing, we’re able to offer highly competitive pricing while maintaining top-tier quality—delivering more value for your investment.

Global Reach with Local Support

Serving clients worldwide, we combine international capabilities with personalized customer service. Whether you’re a multinational manufacturer or a local machine shop, our team is here to support you at every step.

Machine Screw Head Styles

We offer a wide range of premium machine screw head styles—including Flat Head, Pan Head, Round Head, Oval Head, Truss Head, Hex Head, Socket Head, Button Head, Fillister Head, and Binding Head—to meet all your industrial and DIY fastening needs.
Flat Head Machine Screws

Flat Head Machine Screws

The head of a flat head machine screws is flat on top and has a tapered underside (like a cone) that allows it to recess into a countersunk hole, creating a flush or slightly below-surface finish. This head style makes them suitable for applications where a smooth, clean finish is desired, such as in furniture, machinery, or electronics.
Pan Head Machine Screw

Pan Head Machine Screw

A pan head machine screw is a threaded fastener with a round head that sits above the surface being fastened. It has a flat underside of the head, resembling a pan, hence the name. The screw length is measured from the underside of the head, not the top,commonly used in metalworking projects, including metal building construction. 
Round Head Machine Screw

Round Head Machine Screw

Round head machine screw is a fastener that has a rounded, dome-shaped head. These screws are commonly used in woodworking, metalworking, and general construction applications. They are often preferred for their smooth, finished appearance after installation, and their ability to grip well. 
Oval Head Machine Screw

Oval Head Machine Screw

Oval head machine screw is a fastener that features a head shaped like a half-oval or a low dome with a countersunk base. It is designed for applications where the head needs to sit flush or slightly recessed into the surface, while still offering a decorative or more aesthetically pleasing look. such as attaching trim, molding, or other hardware where a flush or slightly recessed head is desired. 
Truss Head Machine Screw

Truss Head Machine Screw

Truss head machine screw is a type of fastener with a distinct head design, similar to a miniature dome or mushroom, that is wider and has a lower profile than a typical pan or flat head screw. This head shape distributes clamping force over a larger area, reducing the risk of marring or crushing the surface it's tightened against. The truss head machine screw sommonly used in applications where low profile, wide bearing surface, and strong connection are desired, such as in construction, metal-to-metal or metal-to-wood connections, and where there is limited space. 
Hex Head Machine Screws

Hex Head Machine Screws

Hex head machine screws are fasteners with a six-sided (hexagonal) head and a threaded shaft, designed to be tightened with a wrench or socket. They are similar to bolts, but unlike bolts, the entire shaft of a machine screw is usually threaded.Commonly in machinery, automotive, and heavy equipment applications.
Socket Head Machine Screw

Socket Head Machine Screw

Socket head machine screw the most prominent feature is the hexagonal recess in the head, which is designed to accept an Allen wrench for tightening. The head is typically cylindrical in shape. The socket head machine screw are used in various applications where high strength and secure fastening are needed, such as in machinery, automotive components, and industrial equipment. 
Fillister Head Machine Screws

Fillister Head Machine Screws

Fillister head machine screws, also known as raised cheese head slotted screws, are similar to cheese head slotted screws because both have cylindrical sides and a flat mating surface. While the cheese head slotted has a flat top, the fillister slotted screw head has a domed top resulting in an overall deeper head.
Binding Head Machine Screw

Binding Head Machine Screw

Binding head machine screw, also sometimes referred to as a Binder Head Screw, is a type of machine screw with a head that's thicker and has a deeper slot compared to a pan head screw. This head design provides a larger bearing surface and a lower profile, making it suitable for applications where a flat, flush surface is needed, or where there's a need to accommodate wire connections in electrical work. 

Applications

Machine screw are commonly used in industrial machinery assembly and repair, electrical and electronic equipment, automotive and aerospace industries, furniture and cabinetry, as well as home improvement and DIY projects.

Applications of Machine Screw
Applications of Machine Screw
Applications of Machine Screw
Applications of Machine Screw
Applications of Machine Screw

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Machine Screw Drive Types

we offer a wide range of machine screw drive types to meet various application needs. Our standard and customizable options include Slotted, Phillips, Pozidriv, Hex, Torx, Square (Robertson), Tri-Wing, Spanner, and other tamper-resistant drive styles. These selections are available across different materials, finishes, and dimensions to support both common and specialized fastening requirements in industrial, commercial, and custom-use settings.

Download here: Common Screw Drives Shapes Chart

Machine Screw Drive Types

Machine Screw
Materials：
Stainless Steel (A2-70, A4-80)，Carbon Steel，Brass，Aluminum
Finishes Coatings:
Zinc-Plated (Clear, Yellow, Black)
Nickel or Chrome-Plated
Black Oxide
Phosphate Coated
PTFE / Teflon Coated (for low friction and anti-galling)
Anodized (for aluminum machine screws)
Passivated Stainless Steel
Custom coatings for enhanced corrosion resistance or aesthetic preference


Machine Screw Thread Diameters And Thread Sizes

Nominal Size, Threads/lnch & Series Designation Allowance Major Diameter Pitch Diameter
Max Min Max Min Tolerance
0-80
1-64
1-72
2-56
2-64 		UNF
UNC
UNF
UNG
UNF 		0.0005"
0.0006"
0.0006"
0.0006"
0.0006" 		0.0595"
0.0724"
0.0724"
0.0854"
0.0854" 		0.0563"
0.0686"
0.0689"
0.0813"
0.0816" 		0.0514"
0.0623"
0.0634"
0.0738"
0.0753" 		0.0496"
0.0603"
0.0615"
0.0717"
0.0733" 		0.0018"
0.0020"
0.0019"
0.0021"
0.0020"
3-48
3-56
4-40
4-48
5-40 		UNG
UNF
UNG
UNF
UNC 		0.0007"
0.0007"
0.0008"
0.0007"
0.0008" 		0.0938"
0.0983"
0.1112"
0.1113"
0.1242" 		0.0938"
0.0942"
0.1061"
0.1068"
0.1191" 		0.0848"
0.0867"
0.0950"
0.0978"
0.1080" 		0.0825"
0.0845"
0.0925"
0.0954"
0.1054" 		0.0023"
0.0022"
0.0025"
0.0024"
0.0026"
5-44
6-32
6-40
8-32
8-36 		UNF
UNG
UNF
UNG
UNF 		0.0007"
0.0008"
0.0008"
0.0009"
0.0008" 		0.1243"
0.1372"
0.1372"
0.1631"
0.1632" 		0.1195"
0.1312"
0.1321"
0.1571"
0.1577" 		0.1095"
0.1169"
0.1210"
0.1428"
0.1452" 		0.1070"
0.1141"
0.1184"
0.1399"
0.1424" 		0.0025"
0.0028"
0.0026"
0.0029"
0.0028"
10-24
10-32
12-24
12-28
1/4"-20 		UNG
UNF
UNG
UNF
UNG 		0.0010"
0.0009"
0.0010"
0.0010"
0.0011" 		0.1890"
0.1891"
0.2150"
0.2150"
0.2489" 		0.1818"
0.1831"
0.2078"
0.2085"
0.2408" 		0.1619"
0.1688"
0.1879"
0.1918"
0.2164" 		0.1586"
0.1658"
0.1845"
0.1886"
0.2127" 		0.0033"
0.0030"
0.0034"
0.0032"
0.0037"
1/4"-28
5/16"-18
5/16"-24
3/8"-16
3/8"-24 		UNF
UNG
UNF
UNG
UNF 		0.0010"
0.0012"
0.0011"
0.0013"
0.0011" 		0.2490"
0.3113"
0.3114"
0.3737"
0.3739" 		0.2425"
0.3026"
0.3042"
0.3643"
0.3667" 		0.2258"
0.2752"
0.2843"
0.3331"
0.3468" 		0.2225"
0.2712"
0.2806"
0.3287"
0.3430" 		0.0033"
0.0040"
0.0037"
0.0044"
0.0038"
7/16"-14
7/16"-20
1/2"-13
1/2"-20
9/16"-12 		UNG
UNF
UNG
UNF
UNG 		0.0014"
0.0013"
0.0015"
0.0013"
0.0016" 		0.4361"
0.4362"
0.4985"
0.4987"
0.5609" 		0.4258"
0.4281"
0.4876"
0.4906"
0.5495" 		0.3897"
0.4037"
0.4485"
0.4662"
0.5068" 		0.3850"
0.3995"
0.4435"
0.4619"
0.5016" 		0.0047"
0.0042"
0.0050"
0.0043"
0.0052"
9/16"-18
5/8"-11
5/8"-18
3/4"-10
3/4"-16 		UNF
UNG
UNF
UNG
UNF 		0.0014"
0.0016"
0.0014"
0.0018"
0.0015" 		0.5611"
0.6234"
0.6236"
0.7482"
0.7485" 		0.5524"
0.6113"
0.6149"
0.7353"
0.7391" 		0.5250"
0.5644"
0.5875"
0.6832"
0.7079" 		0.5205"
0.5589"
0.5828"
0.6773"
0.7029" 		0.0045"
0.0055"
0.0047"
0.0059"
0.0050"
7/8"-9
7/8"-14
1"-8
1"-12
1"-14 		UNG
UNF
UNG
UNF
UNS 		0.0019"
0.0016"
0.0020"
0.0018"
0.0017" 		0.8731"
0.0834"
0.9980"
0.9982"
0.9983" 		0.8592"
0.8631"
0.9830"
0.9868"
0.9880" 		0.8009"
0.8270"
0.9168"
0.9441"
0.9519" 		0.7946"
0.8216"
0.9100"
0.9382"
0.9463" 		0.0063"
0.0054"
0.0068"
0.0059"
0.0056"
1-1/8"-7
1-1/8"-8
1-1/8"-12
1-1/4"-7
1-1/4"-8 		UNG
UN
UNF
UNG
UN 		0.0022"
0.0021"
0.0018"
0.022"
0.0021" 		1.1228"
1.1229"
1.1232"
1.2478"
1.2479" 		1.1064"
1.1079"
1.1118"
1.2314"
1.2329" 		1.0300"
1.0417"
1.0691"
1.1550"
1.1667" 		1.0228"
1.0348"
1.0631"
1.1476"
1.1597" 		0.0072"
0.0069"
0.0060"
0.0074"
0.0070"
1-1/4"-12
1-3/8"-6
1-1/8"-8
1-3/8"-12
1-1/2"-6 		UNF
UNC
UN
UNF
UNC 		0.0018"
0.0024"
0.0022"
0.0019"
0.0024" 		1.2482"
1.3726"
1.3728"
1.3731"
1.4976" 		1.2368"
1.3544"
1.3578"
1.3617"
1.4794" 		1.1941"
1.2643"
1.2916"
1.3190"
1.3893" 		1.1879"
1.2563"
1.2844"
1.3127"
1.3812" 		0.0062"
0.0080"
0.0072"
0.0063"
0.0081"
1-1/2"-8
1-1/2"-12
1-5/8"-8
1-3/4"-5
1-3/4"-8 		UN
UNC
UN
UNC
UN 		0.0022"
0.0019"
0.0022"
0.0027"
0.0023" 		1.4978"
1.4981"
1.6228"
1.7473"
1.7477" 		1.4828"
1.4867"
1.6087"
1.7268"
1.7327" 		1.4166"
1.4440"
1.5416"
1.6174"
1.6665" 		1.4093"
1.4376"
1.5342"
1.6085"
1.6590" 		0.0073"
0.0064"
0.0074"
0.0089"
0.0075"

What about machine screw thread sizes? Please read: 《machine screw size chart》


How to Order

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1. Send Us Your Requirements

Submit your specifications (size, quantity, material, head/drive type) via our online form or email.
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2. Get a Fast Quote

We’ll respond within 24 hours with pricing, lead time, and any clarifying questions.
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3. Sample Approval (If Needed)

Free or low-cost samples available for testing and evaluation.
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4. Production & Delivery

Mass production starts after sample or PO confirmation. Air or sea shipping options available.

Not Sure What You Need?
Our expert team can help you choose the right type, material, and finish for your specific application. Contact us today for a free consultation or sample request.

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FAQs

what is a machine screw
A machine screw is a fastener, similar to a bolt, that's designed to be threaded into a pre-existing, tapped hole or used with a nut. They are typically smaller in diameter (under 0.75 inches, according to the American Society of Mechanical Engineers (ASME)) and have a recessed drive head (like slotted or Phillips) for turning with a screwdriver. Machine screws are fully threaded along their length and are commonly used in various applications like attaching parts in machinery, electronics, and industrial equipment. View More

What are machine screws used for
Machine screws are primarily used for joining metal components, especially in applications where a strong and durable connection is needed. They are commonly used in machinery, vehicles, electronics, and other industrial equipment. These screws thread into a pre-drilled hole or nut, providing a secure and reliable fastening solution. View More

How to measure a machine screw
To measure a machine screw, you'll need to determine both its length and its diameter (thread size). The length is typically measured from the underside of the head to the tip of the screw. The diameter refers to the functional width of the threaded portion, not the head. View More

What is a truss head machine screw
A truss head machine screw is a type of threaded fastener characterized by a distinct head design that resembles a miniature dome or mushroom. The truss head is wider and has a lower profile compared to other screw head types such as pan head or flat head screws. It features a flat, almost horizontal top surface with a rounded, slightly curved profile that slopes down to the sides. View More

Can you use machine screws in wood
Yes, you can use machine screws in wood, but it's often done with some preparation. Machine screws are typically designed for metal-to-metal connections, but you can adapt them for use in wood by first creating a threaded hole in the wood using a tap. This creates a female thread that the machine screw can engage with, providing a strong and repeatable connection.

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Are machine screws stainless steel
Machine screws can be made from stainless steel, but they are not exclusively stainless steel. Machine screws are available in a variety of materials including stainless steel, brass, steel, nylon, and others, depending on the application and environment they are intended for. View More

How to keep machine screws from loosening
To prevent machine screws from loosening, use threadlocker, washers, or a combination of both. Threadlocker is an adhesive that fills the gaps in the threads and bonds the screw to the material, preventing it from loosening due to vibration. Washers, especially spring washers, can help absorb vibrations and keep the screw tight. View More

What are machine screws made of
Standard machine screws are typically made from steel, though they can also be crafted from stainless steel, brass, aluminum, or plastic (polymer). The specific material used depends on the intended application and the environmental conditions the screw will be exposed to. View More

What size drill bit for a 8/32 machine screw
For an 8-32 machine screw, a #29 drill bit is typically recommended. This drill bit size is about 0.1360 inches in diameter, which is slightly smaller than the screw's nominal shank diameter of 0.1640 inches. View More

How to cut machine screws
To cut machine screws effectively and cleanly, follow these recommended methods and tips:

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What size machine screw for electrical box
For most standard electrical boxes, a #6-32 machine screw is commonly used, particularly for mounting covers and devices. These screws have a #6 diameter thread and 32 threads per inch. For mounting devices like outlets and switches, the box will typically have pre-threaded holes or molded bosses that accept the mounting screws provided with the device. View More

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