Clayton Off Road 5/8-18 x 4.0" Grade 8 Bolt Kit for Jeep Suspension

Is This for You?

• You're replacing or servicing a Clayton control arm or suspension pivot that uses 5/8"-18 hardware — this is the correct OEM-spec bolt, washer, and locknut set for Clayton suspension applications requiring the larger 5/8" thread diameter at 4.0" grip length.
• You've stripped, lost, or damaged the original pivot hardware during a trail repair or rebuild — 5/8"-18 fine thread at 4.0" grip length is not a hardware store item; get the correct spec the first time.
• You're running a high-heat or high-vibration application where nylon insert locknuts fail — the all-metal top-lock design holds 204 ft-lbs of clamp load without degrading under heat cycles that soften nylon inserts.

The Result

• Grade 8 / IFI-100/107 Grade C bolt rated to 204 ft-lbs torque — correct spec for 5/8"-18 suspension pivot hardware at this grip length.
• All-metal top-lock nut with deformed thread locking zones — vibration-resistant without nylon inserts that soften under heat, rated Grade C equivalent to Grade 8.
• Zinc-plated hardware — corrosion-resistant in normal atmospheric and off-road environments.

The COR-1100120 bolt kit is a precision-spec hardware set for Clayton Off Road suspension applications requiring 5/8"-18 fine thread pitch at 4.0" grip length. The Grade 8 bolt (ANSI B1.1 UNC/UNF Class 2B thread) is paired with two hardened washers and an all-metal top-lock nut rated IFI-100/107 Grade C — the all-metal equivalent of a Grade 8 fastener. The top-lock nut uses a deformed thread section at the crown to create two to three locking zones that engage under wrench torque, not hand pressure. This design maintains clamp load under vibration and thermal cycling where nylon insert locknuts lose retention. At 204 ft-lbs, this is a higher-torque application than the 1/2"-20 kit (COR-1100119, 102 ft-lbs) — confirm your application requires the 5/8" diameter before ordering. Zinc plating provides baseline corrosion resistance for trail and road use. Sold as a complete kit: 1 bolt, 2 washers, 1 all-metal top-lock nut.

Audit Table

Verified Fitment (OFAS Standard)

✅ Compatible with Clayton Off Road suspension applications requiring 5/8"-18 x 4.0" Grade 8 hardware
❌ Does NOT replace 1/2"-20 bolt applications (see COR-1100119 for 1/2"-20 x 3.5" kit, 102 ft-lbs)
❌ Does NOT replace 9/16" bolt applications — verify your Clayton kit's hardware spec before ordering
❌ Does NOT fit metric thread applications
❌ Not for use in skid plate mounting — suspension pivot hardware only

Installation & Fabrication Notes

• Top-Lock Nut Warning: This nut will NOT thread on by hand to final position. Start threads by hand to confirm engagement, then drive to torque with a calibrated wrench.
• Torque to 204 ft-lbs using a calibrated torque wrench. Do not impact-gun to final torque.
• Install with one washer under the bolt head and one washer under the nut.
• Zinc plating is not a substitute for anti-seize in high-corrosion environments — apply anti-seize to threads if operating in salt, mud, or submerged conditions.
• All-metal locknuts are single-use by IFI specification — replace if removed; do not reuse a previously torqued top-lock nut.
• Inspect hardware at each service interval for shear deformation, thread damage, or corrosion.

Wheel & Tire Fitment

Hardware kit — no wheel or tire fitment restrictions apply. Verify bolt spec matches your specific Clayton suspension component before ordering.

Engineering Question: Are you replacing hardware on a Clayton suspension pivot? Confirm your application requires 5/8"-18 fine thread pitch and 4.0" grip length before ordering — using the incorrect thread diameter (1/2" vs. 5/8") or grip length will result in improper clamp load and potential joint failure. If your application uses 1/2"-20 hardware, order COR-1100119 instead.