Technical Resources
Engineering insights, code compliance guides, and technical articles on mechanical rebar splicing from Bosa Technology's engineering team.
Rebar Sizes & Specifications: A Reference Guide for Engineers
A quick-reference guide covering metric bar sizes (6 mm to 50 mm), imperial sizes (#3 to #18), yield strengths for Grades 40 through 80, and the international standards that govern them. Includes guidance on how bar diameter influences the choice between lap splicing and mechanical couplers.
Rebar Lap Splice Length Guide: When to Switch to Mechanical Splices
Lap splice lengths grow dramatically as bar diameter increases — a 40 mm bar can require over 2 metres of overlap. This guide provides reference tables for ACI 318 and AS 3600 lap lengths, explains the factors that increase them, and shows when mechanical couplers become the more practical and reliable solution.
The Complete Guide to Rebar Coupler Types: Threaded, Bolted, Grouted & More
Mechanical rebar couplers come in several distinct families — threaded, bolted, grout-filled, swaged, and positional — each engineered for different site conditions and performance requirements. This guide explains how each type works, its advantages and limitations, and the standards that govern its use.
Type 1 vs Type 2 Mechanical Splices: What Engineers Need to Know
ACI 318 classifies mechanical rebar splices into two categories — Type 1 and Type 2 — based on their strength requirements and permitted placement in seismic-resistant structures. Understanding this distinction is critical for specifying the right coupler for your project.
Why Random Sampling Matters: The Hidden Risk in Coupler Testing
A coupler that passes a lab test is only as trustworthy as the sample that was tested. If the sample was hand-picked by the manufacturer rather than drawn at random from a production batch, the test certificate may tell you very little about the thousands of couplers actually installed in your structure.
Australian Rebar Connection Standards: What AS 3600 Requires for Mechanical Splices
AS 3600:2018 introduced Clause 13.2.6, establishing clear requirements for mechanical splices in Australian concrete structures. This article explains the clause, the ISO 15835 testing framework it references, and what engineers need to know when specifying couplers for Australian projects.
Mechanical Couplers vs Lap Splicing: Cost, Performance & Constructability
Lap splicing has been the default rebar connection method for decades, but mechanical couplers are increasingly specified on modern projects. This article compares the two methods across cost, structural performance, constructability, and code compliance to help engineers make an informed decision.