BS-21-8-NB Equivalent & Substitute Parts

Part Overview

The BS-21-8-NB is a red insulated spade terminal connector manufactured by 3M, designed for crimp termination of 18-22 AWG wire onto #8 studs. This flanged terminal features tin-plated copper contacts and polyamide insulation, suitable for free-hanging in-line applications. The part is currently active in production status with 997 units in stock. Substitute parts become necessary when the primary part experiences supply constraints, discontinuation, or when design requirements permit equivalent alternatives that meet the same electrical and mechanical specifications.

Substiute Parts

BS-21-8-NB

3MIn Stock: 1050BS-21-8-NB Datasheet

Current PartRFQ

PN18-8FF-C

Panduit CorpIn Stock: 1355PN18-8FF-C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BS-21-8-NB is determined by the following critical parameters:

• Stud/Tab Size: Must be #8 stud to ensure mechanical fit and electrical contact integrity
• Wire Gauge Range: Must accommodate 18-22 AWG to maintain proper crimp force and contact pressure
• Terminal Type: Flanged configuration required for consistent mounting and alignment
• Termination Method: Crimp termination only; no other termination types are compatible
• Insulation Material: Polyamide (PA) or equivalent dielectric material
• Color Coding: Red insulation for circuit identification purposes
• Contact Material & Finish: Copper with tin plating for corrosion resistance and electrical conductivity

The substitute part PN18-8FF-C from Panduit Corp meets all critical substitution criteria. Both parts share identical wire gauge range, stud size, terminal type, insulation material, color, and contact specifications. Minor dimensional variations (outer width and overall length) fall within acceptable tolerances for free-hanging in-line applications and do not affect functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (BS-21-8-NB): Select this 3M terminal when supply is available and active production status is required. Current inventory of 997 units supports immediate procurement. ROHS3 compliance and MSL Level 1 rating confirm suitability for standard industrial and commercial applications.

Substitute Part (PN18-8FF-C): The Panduit PN18-8FF-C is functionally equivalent and meets all critical electrical and mechanical parameters. However, this part carries obsolete product status, indicating discontinued manufacturing. Selection of this substitute should be limited to applications where existing inventory is available (1309 units in stock) and long-term supply is not a requirement. ROHS3 compliance and identical contact specifications ensure electrical performance parity with the primary part.

Selection Logic: Choose BS-21-8-NB for new designs and ongoing production requirements. Use PN18-8FF-C only when primary part supply is exhausted and existing substitute inventory is available for immediate fulfillment.

Frequently Asked Questions (FAQ)

Q: Can PN18-8FF-C be used as a direct replacement for BS-21-8-NB in existing assemblies?

A: Yes. Both terminals accept 18-22 AWG wire, mount on #8 studs, and use identical crimp termination. Dimensional differences (0.010" width and 0.040" length variation) are within acceptable tolerances for free-hanging applications and do not affect mechanical fit or electrical performance.

Q: What is the significance of the "Obsolete" product status for PN18-8FF-C?

A: Obsolete status indicates Panduit has discontinued manufacturing this part. Existing inventory may be available from distributors, but future procurement cannot be guaranteed. This part should be used only as a temporary substitute when primary supply is unavailable.

Q: Are there any compliance differences between these two terminals?

A: Both parts are ROHS3 compliant and suitable for regulated applications. The primary difference is MSL rating: BS-21-8-NB carries MSL Level 1 (unlimited moisture sensitivity), while PN18-8FF-C lists MSL as Not Applicable. This does not affect performance in standard operating environments.

Q: What does the serrated termination feature on PN18-8FF-C indicate?

A: Serrated termination refers to the surface texture of the crimp barrel. This feature improves mechanical grip on the wire during crimping but does not affect electrical conductivity or compatibility with standard crimp tools designed for 18-22 AWG terminals.

Q: Can these terminals be used interchangeably in the same circuit?

A: Yes, within the same assembly or circuit. Both terminals provide equivalent electrical contact resistance, current-carrying capacity, and insulation properties for 18-22 AWG applications on #8 studs.