SMT Splicing Shims (Brass and Stainless Steel)
SMT splicing shims are precision metal alignment components used during surface-mount carrier tape splicing to maintain sprocket hole continuity, pitch accuracy, and feeder engagement in accordance with ANSI/EIA-481-C.
These shims are placed at the splice joint to mechanically reinforce the connection between two carrier tape segments, ensuring uninterrupted component feeding during active or staged production.
Dimensional Specifications
- Shim Width: 22 mm (0.86 inch)
- Sprocket Pitch (Po): 4.00 mm
- Sprocket Hole Diameter (Do): Ø1.50 mm
- Hole Center Spacing: 0.00 mm – 3.50 mm center-to-center
- Carrier Tape Standard: ANSI/EIA-481-C compliant
All dimensions are designed to align precisely with standard SMT carrier tape geometry and feeder sprocket requirements.
Material Construction
Brass Shims:
Manufactured from precision-rolled brass alloy for dimensional stability, consistent hardness, and resistance to deformation under feeder tension. Brass provides predictable mechanical behavior and avoids variability associated with low-grade copper alloys.
Stainless Steel Shims:
Manufactured from corrosion-resistant stainless steel for applications requiring increased wear resistance or extended reuse.
These shims are not copper foil and are not plated copper substitutes. Material selection is based on mechanical performance, not cost reduction.
Functional Purpose
SMT splicing shims serve to:
- Maintain correct sprocket hole pitch across a splice
- Prevent feeder skipping or loss of indexing
- Reduce carrier tape distortion at the splice joint
- Support high-speed placement without feeder interruption
- Preserve alignment during reel changeover and tape handoff
They are used in conjunction with mechanical splice tools to ensure repeatable, controlled splices.
Installation Overview
- Open the tape splicer tool to the alignment position
- Place the splice tape with shim onto the two center alignment pins
- Orient the shim with the teeth facing upward
- Position both carrier tape ends onto the alignment pins
- Engage the hold-down clamps to secure the carrier tape
- Crimp the splicer tool to complete the splice
Correct alignment of the shim ensures sprocket pitch continuity through the splice area.
Compatible Splice Tool Requirement
SMT splicing shims are designed for use with heavy-duty mechanical tape splicer tools capable of controlled crimping and precise alignment. Proper tooling is required to achieve consistent results.
Available Part Configurations
- SS-3210 – Standard Brass Shim-Clips (1000 pieces per box)
- SS-8000 – Standard Stainless Steel Shim-Clips (1000 pieces per box)
- SS-9000 – Short Stainless Steel Shim-Clips (1000 pieces per box)
- RSS-1000 – Roll-Format Standard Brass Shim-Clips (1000 pieces per box)
Standards and References
- ANSI/EIA-481-C — Carrier Tape, Reel, and Sprocket Hole Standards
- SMT Feeder Sprocket Pitch: 4.00 mm
- Industry-standard carrier tape geometry for automated placement systems
Common Misconceptions
- SMT splicing shims are not adhesive substitutes
- Brass shims are not interchangeable with copper foil
- Material thickness, hardness, and hole accuracy directly affect feeder reliability
- Improvised or soft metal inserts can cause feeder indexing errors
Summary
SMT splicing shims are precision mechanical components used to preserve carrier tape geometry at splice points. When manufactured from brass or stainless steel to ANSI/EIA-481-C dimensions, they provide reliable feeder engagement, consistent sprocket pitch, and uninterrupted component placement across reel transitions.
They are a functional necessity in controlled SMT splicing processes, not a consumable shortcut.