3M 40149 Scotchlok™ Aluminum Two Hole Lug - Equivalent & Substitute Parts

Part Overview

The 3M 40149 is a Scotchlok™ aluminum terminal connector designed as a rectangular lug for grounding applications. This component is rated for 250MCM (kcmil) wire gauge with a 1/2 inch stud connection. The part maintains Active product status with 753 units in current inventory.

Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when system requirements mandate alternative sourcing options while maintaining electrical and mechanical compatibility.

Substiute Parts

40149

3MIn Stock: 84540149 Datasheet

Current PartRFQ

LAB250-12-5

Panduit CorpIn Stock: 735LAB250-12-5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3M 40149 is determined by strict alignment of the following parameters:

Wire gauge compatibility (250MCM kcmil), stud size (1/2 inch), barrel dimensions (0.594" ID / 0.906" OD), termination method (crimp barrel), and contact material (aluminum) establish the primary substitution criteria. These parameters ensure mechanical fit within the intended application and electrical performance equivalence.

The Panduit Corp LAB250-12-5 qualifies as a substitute based on matching wire gauge, stud size, barrel dimensions, termination method, and aluminum construction. Variations in terminal style (rectangular tongue versus lug), tab thickness, overall length tolerance, and contact finish do not preclude substitution when the core electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

The 3M 40149 maintains Active product status with current inventory availability. The Panduit LAB250-12-5 is listed as Discontinued at DiGi Electronics, making it a secondary option when primary component sourcing is unavailable.

Both components satisfy RoHS compliance requirements. The 3M 40149 carries RoHS Compliant certification, while the Panduit LAB250-12-5 meets ROHS3 Compliant standards. Both parts are REACH Unaffected and classified under ECCN EAR99.

Selection between these components should prioritize the 3M 40149 for new designs and ongoing production due to Active status and confirmed inventory. The Panduit substitute serves as an alternative when supply of the primary component is constrained, provided the application tolerates the minor dimensional variation in overall length (0.050" difference).

Frequently Asked Questions (FAQ)

Q: What determines if the Panduit LAB250-12-5 can replace the 3M 40149?

A: Substitution is valid when wire gauge (250MCM), stud size (1/2 inch), barrel dimensions (0.594" ID / 0.906" OD), termination method (crimp barrel), and contact material (aluminum) match between components. The Panduit part meets all these criteria.

Q: Does the difference in terminal type (lug versus rectangular tongue) affect substitution?

A: Terminal type designation reflects form factor but does not preclude substitution when the stud connection, wire gauge rating, and barrel dimensions are identical. Both components accommodate the same wire gauge and stud configuration.

Q: Is the 0.050" length difference between parts significant?

A: The length variation (3M: 6.000" versus Panduit: 6.050") falls within typical manufacturing tolerance ranges for this component category and does not affect electrical or mechanical compatibility in standard applications.

Q: What is the impact of the Panduit part being discontinued?

A: Discontinued status indicates the manufacturer no longer produces this component through normal distribution channels. Existing inventory may remain available through secondary sources, but long-term availability is not assured. The 3M 40149 remains the recommended primary selection.

Q: Are both components suitable for the same environmental and compliance requirements?

A: Both components are RoHS compliant, REACH Unaffected, and classified as EAR99. They meet equivalent regulatory standards for terminal connector applications in the specified wire gauge category.