When designing and choosing a Standoff for your next application, it is easiest to think of standoffs as 3 separate sections; the two threaded ends and the main body. The below guide will help you think through those 3 sections and provide the common information needed for finding the right standoff.
Step 1 – Thread Type
- Standoffs are divided into a few different styles and named after the type of threads on each end.
These are also referred to as a Threaded Spacer and come with female threads on both ends of the part. This allows for a screw or male standoff to be installed on either side. In shorter lengths, standoffs will be threaded through the entire part, where longer standoffs are threaded to a minimum thread depth. Female Standoffs can also include a “Swage” end providing a more permanent installation option.
These have one end with a male thread and the other end has a female thread. These are excellent for use when stacking circuit boards as each male thread can be installed into the mating part’s female thread. This quickly reduces the number of fasteners needed in the assembly while also reducing installation time.
Step 2 – Thread Size
- Standoffs are readily available in all common thread sizes, in both inch and metric series. While most commonly found with each end having the same size thread, different thread sizes are available upon request.
Step 3 – Body Length
- The third part of the standoff once the thread sizes have been determined is the body. As standoffs are commonly used to separate 2 components, the body of the standoff is what will separate the components. As each application will require a unique body length, all standoffs come in a wide range of length options. Parts are machined to a tight tolerance of +/-0.005” (+/-0.13mm) for a secure and consistent fit. Custom lengths and tolerances are available upon request.
Through Internal Threaded Hex Standoff F-F
A hexagonal, mechanical device which has a partial or complete internal thread, used to hold two components at a given distance from each other.
Advantages – Standoffs are usually chosen over spacers when longer sizes are required. Hex standoffs can be installed with a nut-setter or other wrenching device.
Suitable for using with screws at both ends providing a clean finish.
Brass – Brass is used in making high-quality standoffs. It is conductive, resists corrosion, and is non-magnetic. It is costlier and heavier than Nylon and is usually plated nickel.
Nylon – Nylon is a good insulator and has a surface smoothness which will not fray the insulation of wires that rub against it. Nylon Spacers may have metal inserts to provide stronger threads. These will however be separated by a non conductive material to ensure insulation.
Stainless Steel – Stainless has the advantages of brass but has superior strength & resistance to corrosion and chemical fumes.
Steel – Steel is used in applications requiring greater strength, but it is heavier than aluminum and does not resist corrosion like aluminum, Stainless Steel or brass.
Other options on special order.
E.T. Spacers [Male-Female Spacers]
These are Internal-External Threaded Spacers. Standoffs can be round, hexagonal or square in shape. These are Male-Female type.
Our range of Stainless Steel Male-Female Standoffs are made from AISI 303 and on request AISI-316 can be provided.
Standoffs are available in a variety of materials including aluminium, brass, plastic, steel and stainless steel.