B-55L

U-FRAME TWISTLOCK 55° LINE LOAD

B‑55L Line Load U‑frame Twistlock

The CONTECH® dovetail or U‑frame line load twistlock B‑55L is a bottom twistlock designed for securing ISO container corner castings on board a vessel. It is used in combination with a dovetail or U‑frame such as FR‑47, FR‑47BQ (elongated), or a double FR‑48B/A positioned at 55 degrees.

Unlike a standard bottom twistlock, the B‑55L features a longer shaft. This extended shaft allows the twistlock to correctly engage the container’s corner casting when positioned in the deeper recesses of a line load hatch cover. For this reason, the B‑55L is specifically intended for use in line load hatch covers only and should not be used in shallow or standard dovetail foundations.

The longer shaft ensures:

• Proper reach and engagement inside line load recesses
• Secure locking under high vertical and horizontal loads typical in line load applications
• Stable container alignment during heavy-duty sea transport

Key Characteristics

• Application: Bottom twistlock for line load hatch covers
• Compatible fittings: FR‑47, FR‑47BQ, FR‑48B/A (55°)
• Design feature: Extended shaft for deeper seating in line load recesses
• Function: Ensures proper securing of containers where standard shaft length is insufficient

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