CFF Pro Style Dumbbell Replacement Bolt
5/8"-18 x 2" | Socket Flat Head | Black Oxide
Lost or Stripped Your Dumbbell Bolt? Replace It.
Precision milled socket flat head cap screw for CFF Pro Style 38mm grip dumbbell handles. Alloy steel with black oxide finish. 5/8"-18 x 2" fine thread.
Don't use hardware store bolts that snap under load. This is the exact OEM-spec replacement — ASTM F835 grade, ASME B18.3 standard, 82° flat head. Keep your pro style dumbbells safe and tight.
Product Features
⚙️ Precision Milled
Socket flat head cap screw machined to ASME B18.3 specs.
🛡️ Alloy Steel Grade
ASTM F835 grade alloy steel. Black oxide for corrosion resistance.
🔧 3/8" Allen Drive
Flush mount flat head with hex socket. No protrusion.
✅ Exact Fit
For CFF FIT Pro 38mm Grip Dumbbell Handles. 5/8"-18 x 2".
Technical Specifications
| Type | Socket Flat Head Cap Screw |
| Standard | ASME B18.3 |
| Material / Grade | Alloy Steel / ASTM F835 |
| Finish | Black Oxide |
| Thread | 5/8"-18 Fine, Right Hand |
| Length | 2 inches |
| Head Angle | 82 degrees |
| Head Height | 0.324 inches |
| Head Diameter | Max 1.188" / Min 1.112" |
| Drive Size | 3/8" Allen / Hex |
| Sold | Individually - 1 bolt |
Compatibility
- CFF FIT Pro 38mm Grip Dumbbell Handles — direct OEM replacement
- Other Pro Style Handles using 5/8"-18 x 2" flat head bolts — verify specs
- Not for spinlock dumbbells or 1" standard bars
Frequently Asked Questions
What size bolt for CFF Pro Style dumbbell handles?
CFF Pro 38mm grip dumbbell handles use a 5/8"-18 x 2" socket flat head cap screw. ASTM F835 grade alloy steel with black oxide finish. 82 degree head, 3/8" Allen drive. This is the exact replacement bolt.
Can I use a hardware store bolt for dumbbells?
Not recommended. Hardware store bolts are typically Grade 2 or 5. Pro style dumbbells need ASTM F835 alloy steel to handle drop loads and torque. This precision milled bolt meets ASME B18.3 and won't strip or shear like soft bolts.
What is 5/8-18 thread? Is it fine or coarse?
5/8"-18 is Fine Thread (UNF). 5/8" diameter with 18 threads per inch. Coarse would be 5/8"-11. Pro style dumbbells use fine thread for better holding power and less chance of loosening. Always verify your handle thread count.
How do I install the replacement bolt?
Use a 3/8" Allen wrench / hex key. Thread bolt through handle and collar. Torque to 45-50 ft-lbs. The 82° flat head sits flush. Check tightness before each use. Sold individually — order 2 for a pair of dumbbells.
Safety: Always inspect bolts for wear or stripping. Replace immediately if damaged. Torque to spec. Never use damaged or wrong-grade bolts. Failure can cause injury.
Keep Your Pro Dumbbells Lifting Safe
OEM spec. ASTM F835 grade. Black oxide.
5/8"-18 x 2" | SOLD INDIVIDUALLY
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