7/16"-14 Thin Heavy Jam Nut with Plain Finish

Heavy Hex Jam Nut – Inch Sizes – Plain Finish | High-Strength Locking Nut

A Heavy Hex Jam Nut is a low-profile, internally threaded fastener designed for use in high-strength bolted connections. Manufactured with a plain (uncoated) finish, this nut is ideal for applications where plating is not required or where additional surface treatments will be applied later. The plain finish provides a clean, raw steel surface for custom coatings, welding, or high-heat applications.

Inch-size heavy hex jam nuts are made to ASME B18.2.2 specifications and feature a larger width across flats than standard hex nuts. Their thinner profile allows them to "jam" against a standard nut to help lock it in place and prevent loosening due to vibration or dynamic loads.

Key Specifications:

• Thread Type: UNC (Unified National Coarse) or UNF (Unified National Fine)

• Material: Carbon Steel or Alloy Steel (depending on grade)

• Finish: Plain (uncoated, suitable for indoor or protected environments)

• Sizes: 1/4" to 2" nominal diameters

• Height: Approximately half the height of a full heavy hex nut

• Standard: ASME B18.2.2

Common Applications:

• Double-nut locking systems in mechanical assemblies

• Construction and structural steel connections

• Heavy machinery where a jam nut is used to prevent rotation

• Agricultural equipment and industrial installations

• Frequently used in bolted joints to maintain torque under vibration

Heavy hex jam nuts are a crucial component in secure bolted assemblies, especially where space constraints or lock-nut applications are critical. Use in tandem with a heavy hex nut for maximum resistance to loosening.