This Grade 100 US Type Master Link Assembly (MLA Type) is a heavy-duty top fitting specially designed to assemble 3-leg and 4-leg chain slings, wire rope slings, and synthetic sling assemblies for demanding overhead lifting operations.

High-Strength Grade 100 Alloy Steel: Drop-forged, quenched, and tempered to deliver up to 25% higher working load limits (WLL) than standard Grade 80 assemblies.
US Standard Multi-Leg Design: Configured with a main master link and two intermediate sub-links sized to standard US specifications, ensuring balanced load distribution on 3-leg and 4-leg slings.
4:1 Design Safety Factor: 100% proof load tested and fully certified for overhead lifting compliance in accordance with ASME B30.26 and EN 1677 standards.
Optimal Crane Hook Clearance: Generously proportioned main link allows quick, unrestricted engagement with standard and heavy-duty crane hooks.
Corrosion-Resistant Powder Coating: Finished in a high-visibility, durable powder coating that provides enhanced rust protection and easy identification on the job site.

Technical Data

Grade 100 US Type Master Link Assembly - MLA Type

Quad-Leg Rigging Sub-Link Assembly

Grade 100 Alloy Steel US Type Dimension For 3 & 4-Leg Slings ASTM A952

In heavy industrial hoisting, shipyard crane lifts, modular construction, and offshore logistics, rigging 3-leg and 4-leg chain or wire rope sling bridles requires an engineered top connection to prevent severe link crowding. Forcing multiple sling legs onto a single primary link causes localized bending, point-loading, and uneven weight distribution across the legs.

The H-Lift Grade 100 US Type Master Link Assembly (MLA Type) provides a purpose-engineered solution: a primary oblong master link paired with two dedicated intermediate sub-links, designed according to US rigging conventions to provide symmetrical load tracking and generous clearance on standard crane hooks.

Every component in the MLA-type assembly is drop-forged from premium structural nickel-chromium-molybdenum-boron super-alloy steel. Compared to standard Grade 80 hardware, Grade 100 metallurgy delivers a 25% increase in Working Load Limit (WLL) for the same material cross-section, reducing overall rigging deadweight while maintaining high tensile toughness. Quenched and tempered in automated thermal tracks, MLA master link assemblies deliver superior fatigue resistance and long-term durability in severe operating conditions.

Key Features

Material: Forged super alloy steel, quenched and tempered for maximum durability.
Standards: Built strictly to ASTM A952 dimensions and complies with ASME B30.9 safety standard requirements.
Performance: +25% higher Working Load Limit (WLL) compared to standard Grade 80 assemblies.
Safety Factor: 4:1 design factor.
Testing: Individually proof load tested to 2.5 times the WLL. Fatigue tested to 20,000 cycles at 1.5 times the WLL.
Design: The inclusion of two sub-links separates the chain legs (two legs per sub-link), which prevents dangerous "bunching" at the main lifting point.
Finish: Highly visible powder-coated finish for enhanced corrosion resistance.

Frequently Asked Questions

Q: What is the primary difference between the MLA Type and MLY Type master link assemblies?

A: The primary difference lies in the dimensional sizing standard. The MLA Type is manufactured according to US dimensional conventions (ASTM A952 / ASME B30.26) featuring standard US-proportioned oblong main and sub-links. The MLY Type is manufactured according to European standard dimensions (EN 1677-4). Both assemblies provide Grade 100 load ratings, integrated dual sub-links for 3 & 4-leg slings, and a full 4:1 design safety factor.

Q: Why should a 4-leg chain sling never be connected directly to a single master link without sub-links?

A: Connecting four separate chain legs to a single master link forces the outer connectors to ride up onto the curved side radius of the link rather than sitting in the bottom saddle. This generates severe eccentric side-loading and bending moments that can deform or break the master link at a fraction of its rated capacity. An MLA-type assembly separates the legs into pairs across two intermediate sub-links, ensuring all force vectors pull in straight, balanced alignment.

Technical Specifications

Item No.	Chain Size (inch)	WLL (ton)		Main Dimensions (mm)						Weight (kg)	Product Code
Item No.	Chain Size (inch)	3 or 4 leg (0-45°)	Rope	A	B	D	a	b	d	Weight (kg)	Product Code
10-MLA-20	1/4 (7mm)	5.1	5.6	152	80	18	85	45	14	1.59	505027020
10-MLA-22	5/16	6.7	6.9	160	95	22	85	45	16	2.18	505027022
10-MLA-25	3/8	10.4	11.8	190	110	27	100	60	18	4.22	505027025
10-MLA-32	1/2	17.7	17.7	240	140	33	160	90	25	7.17	505027032
10-MLA-38	5/8	26.6	27.7	267	150	40	180	100	32	15.2	505027038
10-MLA-45	3/4	41.6	38.5	305	152	45	180	100	38	22.1	505027045
10-MLA-57	7/8	50.3	64.9	406	203	57	203	140	45	41.4	505027057
10-MLA-64	1	70.4	72.6	406	203	64	355	178	50	64.4	505027064
10-MLA-83	1-1/4	106.6	118.9	508	254	83	406	203	60	121	505027083

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