RA-RB

Supported Applications

The Omega RA-RB series comprises Standard Dimension Adaptors, Reducing Bushings, Omegalok® Compression Fittings, Metric Thread Adaptors, and Metric Omegalok® Compression Fittings. These components are used for connecting and adapting various types of threaded connections in industrial instrumentation and process systems. The fittings facilitate positive pressure sealing and heavy-duty applications.

Documented connection standards include:

• NPT (National Pipe Taper)
• BSP (British Standard Pipe) threads, including BS 2779
• Metric threads per ISO 228/1

Omegalok® compression fittings are designed for protection tubes with outer diameters ranging from 1/16" to 1/2", as well as metric tube sizes.

Operating Conditions & Performance

The series is constructed from materials selected for industrial durability, including brass, stainless steel (316 SS), and carbon steel. The fittings are designed specifically for positive pressure sealing in heavy-duty applications.

Material selection varies by component type:

• Adaptors & Bushings: Available in Brass (-BR) or Stainless Steel (-SS). Larger reducing bushing sizes (1 1/4" and above) are available only in Carbon Steel (*-CS).
• Compression Fittings: Offered in Brass (BRLK series) or 316 Stainless Steel (SSLK series).

The products are manufactured in the USA.

Configuration Options

The RA-RB series supports a wide envelope of configurations across four primary product families. Selection is driven by thread type, size reduction requirements, and material compatibility with process media or environmental conditions.

Adaptors & Reducing Bushings (RA/RB Series)

• NPT Adaptors: Convert between male and female NPT threads. Sizes range from 1/8" to 1", including cross-thread configurations such as RA-12-1-SS.
• Reducing Bushings: Reduce larger pipe sizes to smaller connections (e.g., RB-14-18 reduces 1/4" NPT female to 1/8" NPT male).
• Metric Thread Adaptors: Convert between Female NPT and Male BSPT, or other metric combinations. Model prefixes MTA1 through MTA4 denote specific thread configurations.

Omegalok® Compression Fittings

• Inch Series (BRLK/SSLK): Accommodate protection tube ODs from 1/16" to 1/2" with male NPT threads ranging from 1/8" to 1/2".
• Metric Series: Support metric protection tubes (e.g., 3.0 mm, 4.5 mm, 6.0 mm) connecting to NPT or BSP threads.

Ferrules & Accessories

• Replacement Ferrules: Sold in packages of 10 for tube ODs from 1/16" to 1/2". Materials include Brass (B-FER), Stainless Steel (SS-FER), and PTFE (T-FER).

Key Product Differences

Variants within the series are distinguished by material composition, thread standard compatibility, and specific dimensional requirements.

• Material Codes: Model numbers suffix with -BR for Brass, -SS for Stainless Steel, or *-CS for Carbon Steel. Note that certain large reducing bushings (e.g., RB-114-34-CS) are available only in carbon steel.
• Thread Standards: Metric thread adaptors differentiate between BSPT (Tapered) and BSPP (Parallel) configurations, indicated by suffixes such as -T or -P on Omegalok® models (e.g., SSLK-18-14T vs. SSLK-18-14P).
• Ferrule Compatibility: PTFE ferrules are compatible only with stainless steel compression fittings.