MIDWEST FASTENER CORP
MIDWEST FASTENER CORP 76305 5/16" Black Phosphate Steel Pushnut Bolt Retainers 40PK hardware
Pack of 40 pushnut retainers with inward-facing flanges that grip 5/16" bolts without threads
- TypeNuts
- Flange teeth grip shafts without threads
- Black phosphate coating resists corrosion on steel
- Pack of 40 covers multiple repair jobs
- Push-on installation needs no special tools
- Permanent hold requires cutting for removal
5/16″ Pushnut Bolt Retainers
This pack contains 40 black phosphate steel pushnuts sized for 5/16 inch bolts. Each nut uses inward-facing flanges that grip the shaft when pressed or lightly tapped into position. The phosphate finish provides a degree of corrosion resistance for general hardware use. Removal requires cutting the retainer off the bolt.
Suited for permanent or semi-permanent fastening
Mechanics and fabricators who need a quick, threadless retainer on 5/16 inch rods or bolts will find these convenient. They are not intended for applications that demand repeated adjustment, high clamping force, or a reusable fastener. Builders requiring a threaded nut or a locking mechanism that can be undone with hand tools should select a different hardware type.
Behaviour under sustained load
The flanged teeth maintain their grip as long as the shaft diameter stays within the nominal 5/16 inch tolerance and the assembly is not subjected to severe vibration that could walk the nut loose. Because the retainer is designed for one-way installation, it does not back off like a threaded nut, but the holding force is limited to the spring tension of the flanges. In high-stress or safety-critical joints a positive locking nut or a welded solution is more appropriate.
Highlights
- Flange teeth grip shafts without threads
- Black phosphate coating resists corrosion on steel
- Pack of 40 covers multiple repair jobs
- Push-on installation needs no special tools
- Permanent hold requires cutting for removal
Specifications
| Brand | MIDWEST FASTENER |
|---|---|
| Type | Nuts |
Questions about this item
What bolt diameter do I need so these 5/16" pushnuts will grip?
They are sized for 5/16" bolts; the inward-facing flanges bite the shank when pressed or lightly tapped on.
Will these hold on a smooth shaft without threads or grooves?
Yes, the flanges act as teeth that dig into plain steel shafts, so threads or grooves are not required.
How can I check they are seated correctly after installation?
The pushnut should sit flush with no visible gap and resist pull-off by hand; if it spins or slides, tap it further until the flanges lock.
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