RFB Retrofit Bolt

Simpson Strong-Tie RFB Retrofit Bolt

The RFB retrofit bolt is a precut threaded rod, supplied with nut and washer, to use with anchoring adhesives to anchor into existing concrete and masonry. Each end of the threaded rod is stamped with rod length in inches and color-coded indicating the grade or type of steel for quick and easy identification post-installation. For 1/2" diameters and larger, our distinctive No-Equal® symbol is also stamped. When used with a Simpson Strong-Tie® adhesive, it offers a complete engineered anchoring system.

Key Features

• Nut and washer come fully assembled on Retrofit Bolt
  
• Stamped length, No-Equal symbol (for diameters ≥1/2") and color‑coded painted heads for easy identification
  
• Multiple grades available to meet light- to heavy-capacity needs
  
• Precut lengths and diameters designed to meet jobsite needs

Material
ASTM F1554 Grade 36

Nut: ASTM A563 Grade A
Washer: ASTM F844
ASTM F1554 Grade 55

Nut: ASTM A563 Grade A Heavy Hex
Washer: ASTM F436
ASTM F1554 Grade 105

Nut: ASTM A563 Grade DH Heavy Hex
Washer: ASTM F436
ASTM F593 Type 304 Stainless Steel

Nut: ASTM F594 Type 304 Stainless Steel
Washer: ASTM A240 Type 304 Stainless Steel
ASTM F593 Type 316 Stainless Steel

Nut: ASTM F594 Type 316 Stainless Steel
Washer: ASTM A240 Type 316 Stainless Steel

Finish
Zinc-plated (unless otherwise noted), available in HDG (per ASTM A153); stainless steel (RFB#5x8SS only)| Zinc plated, hot-dip galvanized

Head Stamp:

3/8 in. diameter — length only
1/2 in. diameter or greater — length and no equal symbol

Color Identification for painted heads:

Grade 36 — Blue
Grade 55 — Yellow
Grade 105 — Red
Type 304 — Burgundy
Type 316 — Light Blue