The shoulder in shoulder bolts refers to the unthreaded portion of the shank located directly below the head. This portion of the bolt may be either round or square. Aerospace, automotive and mechanical industries use round shoulder bolts both in finished products and in manufacturing equipment where movement is required. Read More…
Leading Manufacturers
Ford Fasteners, Inc.
Hackensack, NJ | 800-272-3673Our company has a reputation for superior products, customer service, and dependability. All our fastener products are built to last, and we know that our customers appreciate our dedication to using the best materials and manufacturing techniques. If you would like to learn more about us, contact us by phone or email, or stop by our website today!
Ken Forging
Jefferson, OH | 888-536-3674Our company has manufacturing experiences dating back to 1970 and over the years we have grown into an international supplier of bolts.
Stelfast® Inc.
Strongsville, OH | 800-729-9779At Stelfast, we provide bolts in a variety of shapes, sizes, styles and materials. We aim to be your #1 source for quality products and great customer service. Our bolts and fasteners include: anchor, carriage, eye, lag, elevator, machine, large diameter, nuts, screws, pins and more.
AFT Fasteners
Mansfield, TX | 877-844-8595We are located in The Dallas area, but we are dedicated to serving customers everywhere. Our products serve many industries including automotive, construction, and many others! We have been producing high quality products since 1984 and this is a tradition that we strive to continue! Get in touch with our customer service department today to learn more about what we may do for you!
St. Louis Screw & Bolt
Madison, IL | 800-237-7059St. Louis Screw & Bolt has been in the nut and bolt business since 1887. We are a manufacturer of cold and hot formed A325 and A490 structural, bridge and anchor bolts. We also manufacture hot forged special bolts, stainless steel bolts and u bolts from 1/2" - 4" in diameter.
Nickel Systems, Inc.
Lansdale, PA | 215-855-5633Nickel Systems is a distributor of industrial bolts and stainless steel bolts. We specialize in high nickel fasteners and precision machined parts like hex bolts, u bolts, hex nuts, jam nuts, washers, and pipe plugs. Our corrosion-resistant fasteners are offered in a wide array of choices for your convenience.
Shoulder Bolts - Ken ForgingSquare shoulder bolts are used in this settings as well as applications such as woodworking as they resist rotation, providing a more secure clamp than fully threaded screws which may loosen due to vibrations. Beyond the shape differentiation, there are several different types of shoulder bolts. Locating screws, socket shoulder screws, stripper bolts, swing bolts and latch bolts are just a few examples. These bolts are all most commonly made of steel alloys with varying amounts of carbon, manganese, molybdenum, silicon, sulfur and phosphorous additives. These materials offer high tensile strength, corrosion resistance and specific surface qualities that may be enhanced with a number of treatments and finishes. Zinc plating and black oxide finishes are among the most common options.
The manufacturing process used to create shoulder bolts is similar to that of other bolt types. A steel wire rod is first heated consistently for an extended period of time and all rust particles are removed. If needed, the metal is coated for added protection. Cold forging is then used to shape the rod at room temperature and the rod is forced through dyes at a high pressure to be shaped into long perfectly round rods. Once cut down to the desired length, a second dye shapes the head of the shoulder bolt which may be square, hexagonal or slotted.
Cold forging using high pressure rollers is then used to press in the thread pattern at the end of the shaft while leaving an unthreaded shoulder. The finished course-pitched shoulder bolt is then ready for use in a variety of applications. It is important to note that the length of this particular type of bolt is a measurement of the unthreaded shank or shoulder rather than the full length of the device. Along with length and material considerations, key size, weight, thread size, shoulder diameter, threaded diameter and head type and diameter should all be considered and selected according to the requirements of the intended use.