
Harness Eye Bolt – 7/16-20 x 22mm | Snap-Hook Mount
This is a 22mm (7/8") 7/16-20 UNF eye bolt that gives snap-hook harness ends a solid, quick-release anchor point. It threads straight into most factory seat belt mounting holes and into weld-in harness nuts or bungs, so you can mount a lap belt, shoulder belt or sub-strap without drilling for new hardware. The short 22mm shank sits tight against the floor or mount.
| Manufacturer (Sparco): | 04501 |
| Part Number: | SP4501 |
- 7/16-20 UNF (SAE fine) thread, the standard for seat belt and harness anchors
- 22mm (7/8") shank length, sized for factory threaded anchors and weld-in nuts
- Clip-on anchor point for snap-hook harness end fittings
- Threads into most factory seat belt mounting holes and weld-in harness nuts or bungs
- Leave installed for fast harness removal and reinstallation
- Use a backing plate or reinforcement for any through-floor mount
- Sold individually: order one per snap-hook anchor point
If your harness uses snap-in end fittings, every one of them needs a proper eye bolt to clip onto. This is that piece of hardware. The 7/16-20 UNF thread is the long-standing standard for seat belt anchors. It matches the factory belt mounting holes in most production-based cars and the weld-in nuts and threaded bungs used in caged builds.
Snap-hook mounting is popular for good reason. Once the eye bolts are in, the harness clips in and out in seconds. That makes it easy to pull the belts for a seat change, swap between street and track setups, or get the harness out of the way for interior work. The eye bolts stay in the car, so you never have to fight the anchors again.
At 22mm (7/8"), the shank is sized for factory threaded anchors and weld-in nuts, where there’s limited thread depth and you want the eye seated firmly against the mounting surface. Before you install, check that your anchor has enough clean thread for full engagement. Run the bolt down until the shoulder seats and torque it to your harness manufacturer’s spec. Don’t run thin sheet metal on its own: through-floor mounts need a proper backing plate or reinforcement to spread the load.
Restraint hardware is only as strong as the weakest link in the system. Check every anchor point before each event, and replace any eye bolt that shows thread damage, bending or corrosion. Intended for off-highway competition use only. Not DOT certified.
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