Product Description
1/4-20 UNC Stainless Steel 304 Hex Bolts
Our 1/4-20 UNC Stainless Steel 304 Hex Bolts are durable inch-size fasteners designed for reliable fastening in machinery, equipment, construction, furniture, automotive repair, outdoor projects, and general industrial applications.
Made from high-quality 304 stainless steel, these hex bolts offer good corrosion resistance, clean appearance, and long-lasting performance. The 1/4-20 UNC coarse thread design provides easy installation and strong thread engagement. Each bolt features a standard hex head, allowing convenient tightening with a wrench, spanner, or socket tool.
These bolts are available in multiple lengths from 3/8 inch to 5 inches and can be supplied with matching hex nuts, flat washers, and spring washers for complete assembly use.
Key Features
- 304 stainless steel material for good corrosion resistance and durability.
- 1/4-20 UNC thread: 1/4 inch diameter with 20 threads per inch.
- Fully threaded design for maximum thread engagement.
- Hex head style for easy installation with standard tools.
- Right-hand thread direction for standard fastening applications.
- Coarse thread spacing for quick installation and general-purpose use.
- Multiple lengths available from 3/8″ to 5″.
- Pack of 100 pieces, suitable for repair, assembly, and bulk use.
- Optional matching nuts and washers available for complete fastening sets.
Product Specifications
| Item |
Description |
| Product Name |
1/4-20 UNC Stainless Steel Hex Bolt |
| Material |
Stainless Steel 304 |
| Size |
1/4-20 |
| Thread Standard |
UNC |
| Thread Type |
Coarse Thread |
| Thread Direction |
Right Hand |
| Threading |
Fully Threaded |
| Head Style |
Hex Head |
| Measurement System |
Inch |
| Available Lengths |
3/8″ to 5″ |
| Package |
Pack of 100 |
| Matching Parts |
Hex Nuts, Flat Washers, Spring Washers |
What Does 1/4-20 UNC Mean?
| Marking |
Meaning |
| 1/4 |
Bolt diameter is 1/4 inch |
| 20 |
20 threads per inch, also called 20 TPI |
| UNC |
Unified National Coarse Thread |
| Right Hand |
Standard thread direction, tightened clockwise |
| Full Thread |
Thread runs along the full shank length |
1/4-20 UNC is one of the most common inch thread sizes used in American standard fasteners. It is widely used in machinery, equipment, metalwork, woodwork, repair, and general assembly.
Available Length Options
| Diameter |
Thread Type |
Available Lengths |
| 1/4-20 |
UNC Coarse Thread |
3/8″ |
| 1/4-20 |
UNC Coarse Thread |
1/2″ |
| 1/4-20 |
UNC Coarse Thread |
3/4″ |
| 1/4-20 |
UNC Coarse Thread |
7/8″ |
| 1/4-20 |
UNC Coarse Thread |
1″ |
| 1/4-20 |
UNC Coarse Thread |
1-1/4″ |
| 1/4-20 |
UNC Coarse Thread |
1-3/8″ |
| 1/4-20 |
UNC Coarse Thread |
1-1/2″ |
| 1/4-20 |
UNC Coarse Thread |
1-5/8″ |
| 1/4-20 |
UNC Coarse Thread |
1-3/4″ |
| 1/4-20 |
UNC Coarse Thread |
2″ |
| 1/4-20 |
UNC Coarse Thread |
2-1/4″ |
| 1/4-20 |
UNC Coarse Thread |
Up to 5″ |
Matching Fastener Options
These stainless steel hex bolts can be supplied as individual bolts or as a complete fastening kit.
| Matching Part |
Function |
| Hex Nut |
Locks with the bolt to complete fastening |
| Flat Washer |
Distributes load and protects the surface |
| Spring Washer |
Helps improve anti-loosening performance |
| Bolt + Nut + Washer Set |
Convenient for assembly and maintenance |
Using matching 304 stainless steel nuts and washers is recommended when corrosion resistance and consistent material performance are required.
Material Advantages: Stainless Steel 304
304 stainless steel is one of the most widely used stainless steel materials for fasteners. It provides a good balance of corrosion resistance, strength, appearance, and cost performance.
| Material |
Feature |
Recommended Use |
| Stainless Steel 304 |
Good corrosion resistance and clean finish |
Indoor, outdoor, machinery, furniture, general equipment |
| Stainless Steel 316 |
Better corrosion resistance in harsh environments |
Marine, coastal, chemical, high-humidity applications |
| Carbon Steel |
Higher strength options available, lower cost |
Dry indoor use, coated industrial fasteners |
For general outdoor and indoor fastening, 304 stainless steel 1/4-20 UNC hex bolts are a practical and reliable choice.
Common Applications
| Application Area |
Typical Use |
| Machinery Assembly |
Equipment fastening and maintenance |
| Automotive Repair |
Brackets, panels, and replacement parts |
| Construction |
Light structural fastening and installation |
| Furniture Assembly |
Metal and wood connections |
| DIY Projects |
Home repair and custom projects |
| Electrical Equipment |
Mounting panels, boxes, and frames |
| Outdoor Use |
General corrosion-resistant fastening |
| Industrial Maintenance |
Replacement screws, bolts, and hardware kits |
Product Advantages
These 1/4-20 UNC Stainless Steel 304 Hex Bolts are designed for users who need reliable, corrosion-resistant inch fasteners. The fully threaded body provides strong holding power, while the hex head allows secure tightening with common hand tools.
The pack of 100 is convenient for workshops, repair departments, contractors, factories, and distributors. Multiple length options allow customers to choose the correct bolt for different assembly thicknesses and fastening requirements.
Installation Notes
Before ordering, please confirm the following details:
| Required Information |
Example |
| Thread Size |
1/4-20 UNC |
| Length |
3/8″, 1/2″, 1″, 2″, 5″ |
| Material |
Stainless Steel 304 |
| Quantity |
Pack of 100 or bulk order |
| Matching Accessories |
Nuts, flat washers, spring washers |
| Application |
Machinery, furniture, automotive, outdoor project |
Please make sure the bolt is used with a matching 1/4-20 UNC nut or threaded hole. Metric nuts or other thread types will not fit correctly.
FAQ
Q1: What does 1/4-20 mean?
1/4-20 means the bolt diameter is 1/4 inch, and the thread has 20 threads per inch.
Q2: What does UNC mean?
UNC means Unified National Coarse Thread. It is a common American inch coarse thread standard.
Q3: Are these bolts metric or inch size?
These are inch-size bolts, not metric bolts.
Q4: What material are these bolts made from?
They are made from 304 stainless steel, which offers good corrosion resistance and durability.
Q5: Are these bolts fully threaded?
Yes. These bolts are fully threaded, which means the thread runs along the full shank length.
Q6: What thread direction do these bolts have?
They are right-hand thread bolts, which means they tighten clockwise and loosen counterclockwise.
Q7: What lengths are available?
Available lengths range from 3/8 inch to 5 inches, including common sizes such as 1/2″, 3/4″, 1″, 1-1/2″, 2″, and 2-1/4″.
Q8: Does the package include nuts and washers?
The product can be supplied as bolts only or with matching nuts, flat washers, and spring washers according to customer requirements.
Q9: Can these bolts be used outdoors?
Yes. 304 stainless steel has good corrosion resistance and is suitable for many indoor and outdoor environments. For marine or highly corrosive environments, 316 stainless steel may be recommended.
Q10: Can I use metric nuts with these bolts?
No. These bolts require matching 1/4-20 UNC nuts. Metric nuts are not compatible.
Short Product Summary
1/4-20 UNC Stainless Steel 304 Hex Bolts are fully threaded inch-size hex head fasteners made from corrosion-resistant 304 stainless steel. Available in lengths from 3/8″ to 5″, these bolts are suitable for machinery, automotive repair, furniture assembly, construction, outdoor projects, and industrial maintenance. Matching nuts, flat washers, and spring washers are available for complete fastening solutions.
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