We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Three zinc plated steel castle hex nuts with slotted tops

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 68543 3/4"-16 Zinc Plated Steel Fine Thread Castle Hex Nuts 3PK

SKU CH-Q5PH-Y2CP8

Three fine-thread castle hex nuts with zinc-plated steel construction for secure fastening with cotter pins

  • Product typeNuts
  • Zinc plated steel resists corrosion in automotive use
  • Fine thread 3/4"-16 pitch matches precise fastener requirements
  • Castle slots accept cotter pins for vibration-proof locking
  • Three nuts per pack cover multiple assembly points
  • New condition ensures clean threads and full plating integrity

Product Identity

This pack contains three 3/4"-16 fine-thread castle hex nuts made from zinc-plated steel. They are designed for fastening on bolts or axles that have a drilled hole for a cotter pin or safety wire. The slotted top allows the nut to be rotated to the nearest slot after torquing for secure locking. Mechanics and fabricators needing reliable locking fasteners will use these.

Thermal Noise Power

As passive metal fasteners, these nuts generate no heat, produce no noise and draw no electrical power during installation or operation. Performance depends entirely on correct torque application and the integrity of the mating bolt or axle. The zinc plating provides corrosion resistance for extended service life in typical automotive and industrial environments.

Build Integration

Each nut requires a 3/4"-16 fine-thread bolt or stud with a drilled cross-hole at the threaded end. A cotter pin or safety wire (not included) is necessary to lock the nut in the aligned slot. The 3-pack supplies enough hardware for a single axle or multiple connection points. Builders without drilled fasteners or locking pins cannot use these nuts as intended.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $12.99
Cheaper than about 65% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameMIDWEST FASTENER
Product typeNuts

Questions about this item

How do I install the 3/4"-16 castle nut and align the slot for the cotter pin?

Torque the nut to specification, then rotate it forward to the nearest slot that lines up with the drilled hole in the bolt or axle, and secure it with a cotter pin or safety wire.

When should I replace the cotter pin used with these zinc-plated castle nuts?

Replace the cotter pin any time the nut is removed or if the pin shows bending, corrosion or wear, because the pin is a single-use locking device.

What limits the holding power of these fine-thread castle nuts under sustained vibration?

The locking depends entirely on the cotter pin or safety wire engaging the slotted end; if the pin shears or works loose, the nut can back off.

More in General Hardware & Accessories

Similar items