Description
The BMM Hammerlock Chain Connector is a reliable, heavy-duty coupling link designed for fast, secure, and permanent connections in chain assemblies. Crafted from high-strength Grade 80 alloy steel, this connector delivers exceptional durability and load-bearing performance for demanding applications.
Features
- Grade 80 alloy steel construction: quenched and tempered for superior tensile strength, toughness, and resistance to wear
- Hammerlock design: simple hammer-driven assembly creates a secure, tamper-resistant mechanical interlock (no welding required)
- Fast installation & repair: ideal for quick field connections, chain repairs, or extending lengths without downtime
- Bright yellow powder coat finish: enhances visibility and offers added corrosion protection
- Marked with chain size and grade: ensures easy identification and compliance with safety standards
Common Applications
- Commercial fishing gear repairs (longlines, crab pots, lobster traps, groundlines)
- Overhead lifting slings and rigging setups
- Towing safety chains, trailer connections, and recovery operations
- General chain joining, splicing, or attaching hooks/master links
Specifications
- Material: High-strength Grade 80 (G80 / T8) alloy steel
- Manufacturing Process: Drop-forged, quenched and tempered for maximum toughness, tensile strength, and wear resistance
- Finish: Bright yellow powder coat (standard on BMM models for enhanced visibility and corrosion protection in marine environments)
- Design Standard: US-type hammerlock (mechanical interlocking pin secured by hammering; no welding required)
Safety Factor: 4:1 (minimum breaking strength is 4 × Working Load Limit) - Assembly: Hammer the pin flush using a heavy hammer for a secure, tamper-resistant mechanical lock
| Size (Chain Compatibility) | WLL (Working Load Limit) | A (mm) | B (mm) | C (mm) | D (mm) | E (mm) | F (mm) | Approx. Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| 7mm (BMM Model - Primary) (fits 7–8mm G80 chain) |
2 tonnes (2,000 kg) (marine/fishing ratings up to 8T conservative) |
20–24 | 8.5–9 | 24 | 8.5–9 | 58–72 | 55–78 (overall) | 0.2–0.5 |
| 10mm (fits 10mm G80 chain) |
3.15–3.2 tonnes | 25–26 | 11–12 | 35–40 | 11–12 | 68–90 | 68–80 | 0.3–0.6 |
| 13mm (fits 13mm G80 chain) |
5.3–5.4 tonnes | 29–30 | 14–15 | 45–50 | 14–15 | 88–117 | 87–100 | 0.65–0.8 |
| 16mm (fits 16mm G80 chain) |
8 tonnes | 34–36 | 18–19.8 | 55–60 | 18–20 | 104–148 | 108–120 | 1.1–1.3 |
| 19mm / 20mm (fits 19–20mm G80 chain) |
12–16 tonnes | 40–45 | 22–25 | 65–75 | 22–25 | 130–160 | 130–150 | 1.8–2.5 |
Notes:
- Dimensions (A–F) represent typical hammerlock geometry (e.g., A = body/pin area, C = inside length, E/F = overall dimensions). Exact values vary by manufacturer — consult your supplier's diagram or certs for precision.
- Safety factor: 4:1 (Minimum Breaking Strength = 4 × WLL).
- BMM 7mm model typically features bright yellow powder coat for marine visibility and higher conservative ratings in fishing applications.
- Always match connector size to chain diameter/grade and never exceed the stated WLL.
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