FSS is open and fully functional, click here to read our message regarding Covid-19 / Coronavirus

Even if you know the exact size, length, material & finish of a bolt you need, you still need to know what style of bolt is right for your application. Bolts come in a large variety of head and thread styles. Use our bolt guide below to help identify the parts you need.

Download the Guide

Standard Carriage Bolts (Square Neck)
Ribbed Neck Carriage Bolts

Standard Carriage Bolts (Square Neck)
Standard carriage bolts come in square neck style, with some parts available in a short neck option. Featuring a round head with a square neck under the head, along with machine screw threads, the square neck is designed to keep the bolt from turning as a nut is tightened. The short neck variety is used in sheet metal where a standard sized neck would create an obstruction.


Standard Carriage Bolt Material / Finish Options:
Steel / Zinc
Steel / Hot Dip Galvanized
Steel / Black Oxide
Grade 5 / Zinc
Grade 8 / Zinc Yellow
18-8 Stainless Steel
(Short neck in steel / zinc only)

Ribbed Neck Carriage Bolts
Same head shape as a standard carriage bolt, but the square shape under the head is replaced with vertical ribs slightly wider than the diameter of the bolt. The ribs help prevent the bolt from turning as a nut is tightened or removed.


Ribbed Neck Carriage Bolt Material / Finish Options:
Steel / Zinc
Grade 5 / Zinc
18-8 Stainless Steel

Dowel Screws

A two sided fastener with wood screw type threads and points at both ends. Inserted into a pre-drilled hole, they are commonly used for fastening two pieces of wood together in a permanent position, relative to one another. Frequently used in the furniture industry.


Dowel Screws are offered in Steel / Zinc.

Elevator Bolts

Bolt with a wide, countersunk flat head, a shallow conical bearing surface, an integrally-formed square neck under the head, and a unified thread pitch. Similar to carriage bolts, except that the top of the head is flat, rather than the bottom of the head. Provides a low profile fastening solution. Popular use is in conveyor systems, such as elevators.


Elevator Bolts are offered in Steel / Zinc.

Hanger Bolts

Hanger bolts are available in full thread and plain center options. They are threaded at both ends, with one side having wood screw type threads, and the other having machine screw threads. Designed for the wood screw side to be inserted into a pre-drilled pilot hole, the machine threads becomes a post with which to attach materials. Used for suspending electrical wiring and sheet metal, as well as commonly used in the furniture industry.


Hanger Bolt Material / Finish Options:
Steel / Zinc
18-8 Stainless Steel

Hex Cap Screws

Most common type of hex head bolt. Our hex cap screws start at 1/4" diameters and go up to 1 1/2" diameters, with lengths up to 16". Hex cap screws are the most common type of bolt and generally come partially threaded (as opposed to hex tap bolts). Our selection includes metric sizes as well.


Hex Cap Screw
Material / Finish Options:

Grade 2 / Zinc
Grade 2 / Black Oxide
Grade 5 / Plain
Grade 5 / Zinc
Grade 8 / Plain
Grade 8 / Zinc Yellow
18-8 Stainless Steel
316 Stainless Steel
Silicon Bronze

Metric Hex Cap Screw
Material / Finish Options:

Grade 8.8 / Zinc
Grade 10.9 Plain

FASTENER BUYING MADE SIMPLE

The Fastener Superstore is your one stop shop for screws, nuts, bolts, washers, rivets, standoffs and more! We have everything you need right here

  • 34,000+ Distinct Parts
  • All Pricing Online
  • No Registration Required
  • Same Day Shipping on Most Orders
  • Order online, via phone, email or fax
  • Extended Customer Service Hours
    (7am-7pm CT)
  • Quotes Available for Larger Quantities
Hex Flange / Frame Bolts

Commonly used in the automotive industry, flange / frame bolts consist of a one-piece indented hex washer head bolt with a flat, flanged bearing surface. The flange eliminates washers and can help compensate for misaligned holes.


Hex Flange / Frame Bolt
Material / Finish Options:

Grade 8 / Black Phos
18-8 Stainless Steel

Metric Hex Flange / Frame Bolt
Material / Finish Options:

Grade 8.8 / Plain
Grade 8.8 / Zinc
Grade 10.9 / Black Phos

Hex Machine Bolts

Unlike hex cap screws, hex machine bolts don't feature a washer face on the bearing surface (bottom of the head). The galvanized finish provides better corrosion resistance than a standard zinc coating, and requires matching nuts to have tapped oversize holes.


Hex Machine Bolts are offered in Steel with a Hot Dip Galvanized finish.

Hex Tap Bolts

Always fully threaded, hex tap bolts are used in threaded holes or combined with a hex nut to create a strong fastening system. To be used in drilled and tapped holes which are threaded full length. Used instead of a stud and a nut.


Hex Tap Bolt Material / Finish Options:
Steel / Zinc
Grade 5 / Zinc
Grade 8 / Plain
Grade 8 / Zinc Yellow
18-8 Stainless Steel

Lag Bolts

Also called lag screws, or hex lag screws, lag bolts, feature a hex head, spaced threads and a gimlet point. Lag screws are generally used in pre-drilled holes in wood, or with lag screw shields in a variety of materials. Also available in high-profile, hex-flange, and acoustical eye styles.


Lag Bolt Material / Finish Options:
Steel / Plain
Steel / Zinc
Steel / Hot Dip Galvanized
Steel / Black Oxide
18-8 Stainless Steel

Plow Bolts

Featuring a countersunk, flat head; a square neck; and machine / cap screw threading, plow bolts are used in heavy duty equipment that requires a smooth head surface.


Plow Bolt Material / Finish Options:
Grade 5 / Plain
Grade 5 / Zinc
Grade 10 / Plain

Slotted Flat Head Cap Screws

Slotted flat head cap screws are commonly used in close tolerance machinery. The countersunk head allows for superior head clearance.


Slotted Flat Head Cap Screws are offered in Steel / Zinc.

Square Head Machine Bolts

Combined with square nuts or hex nuts, square head machine bolts offer greater bearing surface for wrenching. Our selection includes Battery Bolts.


Square Head Machine Bolts are offered in Steel with a plain finish.

Step Bolts

Featuring a wide, low-profile, slightly rounded head and a square neck, step bolts are used when a large bearing surface needs to be combined with a low profile head. Similar to a carriage bolt in bearing surface and square-neck design, but with a wider, lowerprofile, round head. Preferred for use where wood is bolted down as decking--the larger diameter head of the step bolt will not pull through the softwood.


Step Bolts are offered in Steel / Zinc.

Structural Bolts

Often used on structural steel joints in heavy construction, structural bolts are also heat treated. The bearing surface is flat and washer faced. Commonly used in structural steel joints in heavy construction.


Structural Bolt Material / Finish Options:
A325 (Medium Carbon Steel / Plain)
A325 (Medium Carbon Steel / Hot Dip Galvanized)

Threaded Rod

Externally threaded and headless, we offer threaded rod in diameters from 1/2" - 1", and in lengths up to 7".


Threaded Rod is offered in Grade B7 Steel with a Plain Finish.

Download the Guide