In addition to manufacturing a huge variety of “bulk” bolts and studs that are sold in kits by size (not by application), ARP compliments them with an assortment of nuts and washers —including nearly 60 new kits for 2026.
ARP’s washer lineup includes both polished stainless steel or black oxide treated 8740 chrome moly in SAE sizes from 1/4” to 3/4” with a choice of standard or chamfered models (designed for use with bolts). Metric sizes from M6 to M18 are also available. Special insert washers —ideal for protecting the top of holes from galling or collapsing— are also offered in popular SAE and Metric sizes.
The company, founded in 1968 and remaining family owned and operated to this day, also offers a variety of premium quality nuts that are manufactured in-house to the industry’s most stringent specifications. In addition to polished stainless steel and black oxide treated 8740 chrome moly 12-point and hex nuts for SAE coarse, fine and Metric applications, ARP also offers Nyloc and Self-Locking hex “Jet” nuts and 12-point “K” nuts. Serrated flange nuts are also available.
For details check out the 2026 catalog online at www.ARPcatalog.com or request a free printed copy of the information-packed 180-page publication. Personalized technical assistance is available by calling 800-826-3045.
This story was originally published on February 27, 2026. 
