Clayton Off Road 9/16-18 x 4.0" Grade 8 Bolt Kit for Jeep Suspension

Is This for You?

• You're replacing or servicing a Clayton suspension pivot that requires 9/16"-18 hardware at a 4.0" grip length — this is the longer version of the 9/16" kit, for applications where the 3.0" grip (COR-1100115) is too short for your specific pivot stack-up.
• You've stripped, lost, or damaged the original pivot hardware during a trail repair or rebuild — 9/16"-18 fine thread at 4.0" grip length with SAE J429 Grade 8 certification 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 146 ft-lbs of clamp load without degrading under heat cycles that soften nylon inserts.

The Result

• SAE J429 Grade 8 hex cap screw with yellow zinc finish — higher corrosion resistance than standard zinc, rated to 146 ft-lbs at 9/16"-18 thread pitch.
• All-metal top-lock nut (Grade C, IFI-100/107) with deformed thread locking zones — vibration-resistant, heat-stable, zinc finish for corrosion resistance.
• SAE thru-hardened flat washers (yellow zinc) — full hardness through the washer cross-section for consistent clamp load distribution under torque.

The COR-1100109 bolt kit is a precision-spec hardware set for Clayton Off Road suspension applications requiring 9/16"-18 fine thread pitch at 4.0" grip length. The SAE J429 Grade 8 hex cap screw uses a yellow zinc finish — a chromate conversion coating over zinc plating that provides enhanced corrosion resistance compared to standard clear zinc. The bolt is paired with two SAE thru-hardened flat washers (yellow zinc finish) and an all-metal Grade C top-lock nut. 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, maintaining clamp load under vibration and thermal cycling. The 4.0" grip length is 1.0" longer than the COR-1100115 kit (3.0" grip) — used in applications where a thicker bracket, bushing housing, or washer stack requires additional bolt length. Torque spec is 146 ft-lbs for both 9/16" kits. 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 9/16"-18 x 4.0" Grade 8 hardware
❌ Does NOT replace 3.0" grip applications (see COR-1100115 for 9/16"-18 x 3.0" kit)
❌ 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 5/8"-18 bolt applications (see COR-1100120/COR-1100121 for 5/8" kits, 204 ft-lbs)
❌ 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 146 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.
• Verify the 4.0" grip length is correct for your specific pivot stack-up — measure bracket thickness + bushing housing width + washer thickness before ordering.
• Yellow zinc finish provides enhanced corrosion resistance over standard zinc — still apply anti-seize to threads in high-corrosion environments (salt, mud, submerged use).
• All-metal locknuts are single-use by IFI specification — replace if removed; do not reuse a previously torqued top-lock nut.

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 certain your application requires the 4.0" grip length and not the 3.0" version (COR-1100115)? Measure your pivot stack-up before ordering — using the wrong grip length results in improper thread engagement beyond the locknut and potential joint failure under load.