3M 31156 Terminal Connector Rectangular Lug 350MCM #1/2 Stud - Equivalent & Substitute Parts

Part Overview

The 3M 31156 is an active-status terminal connector designed as a rectangular lug for grounding applications. It accommodates 350MCM (kcmil) wire gauge with a 1/2 stud connection. This component is used in high-amperage electrical distribution systems where secure, crimped barrel termination is required. Finding equivalent substitute parts may be necessary due to inventory constraints, supply chain considerations, or specific application requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

31156

3MIn Stock: 87131156 Datasheet

Current PartRFQ

LCC350-12-X

Panduit CorpIn Stock: 1031LCC350-12-X Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3M 31156 is determined by strict alignment of the following critical parameters:

• Wire gauge: 350MCM (kcmil) — exact match required
• Stud size: 1/2 stud — exact match required
• Barrel inner diameter: 0.700" (17.78mm) — exact match required
• Termination method: Crimp, barrel — exact match required
• Contact material: Copper — exact match required
• Contact finish: Electro-tin — exact match required
• Mounting configuration: Free hanging (in-line) — exact match required
• Insulation type: Non-insulated — exact match required

The Panduit Corp LCC350-12-X qualifies as a substitute based on these parameters. While terminal style differs (rectangular tongue versus lug), both configurations serve equivalent grounding and connection functions with identical electrical and mechanical interface specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the 3M 31156 and Panduit LCC350-12-X maintain active product status and full regulatory compliance. The 3M 31156 carries RoHS Compliant certification, while the Panduit LCC350-12-X carries ROHS3 Compliant certification. Both are REACH Unaffected and classified under ECCN EAR99. Selection between these parts should be based on inventory availability, lead time requirements, and application-specific mechanical constraints related to terminal style preference (lug versus rectangular tongue configuration).

Frequently Asked Questions (FAQ)

Q: Can the Panduit LCC350-12-X replace the 3M 31156 in existing installations?

A: Yes, provided the application accommodates the rectangular tongue terminal style. Both parts share identical wire gauge (350MCM), stud size (1/2), barrel dimensions (ID 0.700", OD within 0.005"), contact material (copper), contact finish (electro-tin), and termination method (crimp, barrel). The primary difference is terminal geometry.

Q: What is the significance of the barrel outer diameter difference (0.875" versus 0.880")?

A: The 0.005" difference falls within standard manufacturing tolerance ranges for this component category and does not affect electrical or mechanical compatibility in applications designed for 350MCM crimp barrel termination.

Q: Are both parts suitable for grounding applications?

A: The 3M 31156 is explicitly designated as a grounding terminal. The Panduit LCC350-12-X is classified as a rectangular tongue terminal. Both employ identical copper construction with electro-tin finish and support equivalent electrical performance in grounding circuits.

Q: What packaging considerations apply to these parts?

A: Both parts are supplied in bulk packaging. The 3M 31156 has 826 pieces in stock; the Panduit LCC350-12-X has 945 pieces in stock. Packaging format does not affect electrical or mechanical substitution eligibility.

Q: Do regulatory certifications differ between these parts?

A: The 3M 31156 is RoHS Compliant; the Panduit LCC350-12-X is ROHS3 Compliant. Both are REACH Unaffected and carry identical ECCN (EAR99) and HTSUS (8536.90.4000) classifications. ROHS3 represents an updated compliance standard and does not preclude substitution.