Nomenclature
- "Taper Plug" Gauge (male cone checker)
- "Taper Ring" Gauge (female socket checker)
- Standard taper 1:10 for glassware joints (e.g., 24/29, 19/26)
Standards & Sizes
- ISO 383:1976 conical/interchangeable ground joints
- BS 572 / 2761 and IS 5165-1969 for British/Indian sizes
- Common ISO sizes: 5/13, 7/16, 10/19, 12/21, 14/23, 19/26, 24/29, 29/32, 34/35
- US ASTM sizes: 14/20, 19/22, 24/40
Selection & Ordering
To choose the right gauge, consider:
- Determine the joint size from your glassware (e.g., 24/29).
- Select matching plug (male) and/or ring (female) gauges of the same nominal size.
- Specify length variant if required: full-length, medium-length or ISO/International length.
- Order plug and ring as pairs or separately depending on inspection needs.
- Smitra Lab Taper Plug & Ring Gauge: 24/29 ISO - Plug + Ring set.
- Smitra Lab Taper Plug Gauge: 14/23 ISO - Plug only.
Description & Features
Glass cone-checking taper plug and ring gauges are used to inspect conical ground glass laboratory joints (male/female) for proper fit and leak-tightness.
Constructed in compliance with ISO 383, BS 572/2761 and IS 5165, using the standard 1:10 taper.
Typically made of ground borosilicate glass or stainless steel (for heavy-duty use), ensuring accurate conicity and smooth finish.
- High-precision grinding to +/-0.05 mm ensures tight, leak-proof fit.
- Durable materials: borosilicate glass or SUS-303 stainless steel rod.
- Available in ISO, ASTM and BS/IS lengths and sizes.
Common Uses
- Verifying conical ground glass joints on flasks, condensers, adapters, Schlenk tubes.
- Ensuring interchangeability and leak-tightness in distillation, reflux, and vacuum setups.
- Routine QC inspection in manufacturing of lab glassware.
- Inspection before assembly to pre-empt binding ("frozen" joints) or leaks.
Scope of Supply
Sold separately or in matched sets of plug and ring gauges.
Available in full, medium and ISO standard lengths. Sizes from 5/13 up to 85/55.
Options include glass gauges and stainless steel versions to suit lab or industrial usage.
Each gauge is engraved with nominal size and length for clear identification.
Care & Safety
- Use a thin layer of joint grease or PTFE sleeve if frequent use is expected.
- Clean after use; inspect for chips or wear to maintain sealing accuracy.
- Avoid thermal shock - use gentle cleaning and avoid extreme temperatures.
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