Repair Systems — 03 — Facade & External Envelope
Grade 316L stainless steel back-to-back angle lintel
Supplier reference for grade 316L stainless steel back-to-back angle lintels for wide coastal masonry openings on Class 2 strata buildings. Covers Ancon Building Products and state stainless steel fabricators — used for garage door openings, wide windows, and heavily loaded coastal masonry openings where a single angle section is inadequate. Engineered back-to-back connection with grade 316 fasteners is mandatory. Structural engineer design required for all applications.
What is a grade 316L stainless back-to-back angle lintel?
A grade 316L stainless steel back-to-back angle lintel consists of two equal angle sections placed back-to-back and bolted together with grade 316 stainless fasteners. The configuration provides significantly higher section modulus than a single angle of the same height — used for wide masonry openings such as garage doors, wide windows, and heavily loaded facade zones in coastal and marine-influenced Class 2 strata buildings where a single angle section cannot achieve the required span capacity.
Supplier Reference
3 suppliers — grade 316L stainless back-to-back angle lintels — scroll to view all
Ancon 316L Back-to-Back Stainless Angle — wide coastal openings
Grade 316L stainless back-to-back angle lintel — wide coastal masonry openings — AS 4100
System Description
Ancon Building Products supplies grade 316L stainless back-to-back angle lintels for wide or heavily loaded masonry openings in coastal and marine environments on Class 2 strata buildings. The back-to-back angle configuration provides significantly higher section modulus than a single angle of the same height — used for garage door openings, wide window openings, and structurally loaded facade zones in coastal buildings where a single angle section cannot achieve the required span capacity. The connection between the back-to-back sections must be engineer-designed — Ancon can assist with bolt pattern and clamping force specification for the design loads. All bolts, nuts and washers must be grade 316 stainless — do not use carbon steel or grade 304 fasteners in coastal environments. All welded connections must be passivated by the fabricator before delivery. Material test certificates confirming grade 316L are available on request.
Technical Properties
- Higher structural capacity than single angle — back-to-back configuration significantly increases the effective section modulus and span capability for wide coastal openings
- Grade 316L throughout — both angle sections, all bolts, nuts and washers — full corrosion resistance in coastal and marine environments
- Compatible with Ancon remedial masonry ties and cavity flashing systems — consistent 316L grade across all coastal facade remediation elements
Limitations
- Engineer must design and certify the back-to-back connection — bolt size, spacing and clamping force must be specified for the design loads; do not assume standard bolt patterns
- All bolts, nuts and washers must be grade 316 stainless — do not use carbon steel or grade 304 fasteners in coastal environments
- Heaviest of the stainless lintel options — mechanical lifting assistance is typically required for upper floor replacement
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
Helifix 316L Stainless Back-to-Back Angle — remedial masonry sections
Grade 316L stainless back-to-back angle lintel — Helifix — wide coastal masonry openings
System Description
Helifix supplies grade 316L stainless back-to-back angle lintel sections for wide coastal masonry openings as part of its specialist remedial masonry structural product range. The back-to-back configuration provides significantly higher section modulus than a single angle — used for garage door openings, wide windows, and heavily loaded coastal facade zones where single angle section capacity is insufficient. Helifix can supply back-to-back angle sections to the structural engineer's section specification. Helifix's remedial range includes compatible stainless helical ties, bed joint reinforcement, and fixings — allowing a single supplier system for the full coastal facade remediation scope. The back-to-back connection must be engineer-designed with grade 316 stainless fasteners. All welded connections must be passivated before delivery. Material test certificates confirming grade 316L are available on request.
Technical Properties
- Engineered back-to-back angle sections for wide coastal openings — higher section modulus than single angle for the same visible height
- Grade 316L — full corrosion resistance in coastal and marine environments — maintenance-free service life
- Compatible with Helifix stainless helical ties and bed joint reinforcement — consistent 316L grade across all remedial masonry products
Limitations
- Engineer must design and certify the back-to-back connection — bolt size, spacing and clamping force must be specified for the design loads
- All bolts, nuts and washers must be grade 316 stainless — specify explicitly on fabrication drawing
- Non-standard configurations require lead time for fabrication — confirm lead time before committing to programme
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
State Stainless Fabricators — back-to-back 316L angle with engineered connection
Grade 316L back-to-back angle lintel — engineered connection — fabricated to spec — coastal
System Description
State-based stainless steel fabricators supply grade 316L back-to-back angle lintels fabricated to the structural engineer's drawing — providing full flexibility on angle section size, back-to-back configuration, bolt pattern, and bearing plate details. This route is used for non-standard opening widths, complex structural loading, or projects where the engineer requires a specific fabrication configuration beyond the standard lintel supplier range. The structural engineer must provide a dimensioned fabrication drawing specifying both angle sections, back-to-back bolt pattern, clamping force, bearing plate details, and passivation requirements. All bolts, nuts and washers must be grade 316 stainless — specified explicitly on the fabrication drawing. Request a material test certificate confirming grade 316L for all components before accepting delivery — grades 304 and 316L are visually identical.
Technical Properties
- Full flexibility on angle section size and back-to-back configuration — any engineer-specified section from the stainless merchant's standard range
- Fabricated to the exact bearing-to-bearing dimension for each wide opening from the engineer's drawing
- Material test certificate confirming grade 316L available from the stainless merchant for all components — mandatory for coastal applications
Limitations
- No purpose-designed bearing details or engineering documentation from the fabricator — structural engineer must provide complete fabrication drawings
- Material test certificate must be requested explicitly for all components — do not assume the fabricator will provide MTC without a specific written request
- Passivation of all welded joints is a separate process that must be specified and confirmed in writing — confirm before accepting delivery
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
Supplier Comparison
Side-by-side comparison of 316L back-to-back angle lintel suppliers. Engineer must design and certify the back-to-back connection for every application.
| Supplier | Product | Grade | Sections | Life | Distribution | Key feature | Primary use |
|---|---|---|---|---|---|---|---|
| Ancon Building Products | Back-to-back angle lintel | 316L | Standard + engineer-specified | 50+ yr coastal | National | Purpose-designed, MTC on request | Wide coastal openings — standard range |
| Helifix | Back-to-back angle — remedial range | 316L | Engineer-specified | 50+ yr coastal | National | Full remedial range compatibility | Wide coastal — non-standard sections |
| State stainless fabricators | Back-to-back angle — fabricated | 316L (confirm MTC) | Any — from drawings | 50+ yr coastal | State-based | Custom fabrication, full flexibility | Non-standard wide coastal openings |
Do not confuse 316L back-to-back angle with:
- Single 316L angle lintel — single equal angle section — adequate for most standard coastal masonry openings; use back-to-back only when single angle is confirmed inadequate by structural engineer for the specific span and load
- 316L flat bar lintel — shallow rebate only — lower structural capacity than angle; not applicable to wide openings requiring high span capacity
- Duplex coated back-to-back angle — galvanised plus powder coat carbon steel — not suitable for direct coastal or marine environments where 316L stainless is specified
- Steel channel lintel — single rolled channel section — carbon steel only; not suitable for coastal environments without 316L stainless equivalent
Disclaimer
This page provides general technical information only. Grade 316L stainless back-to-back angle lintel design, section sizes, back-to-back connection, fastener specification, and bearing details must be designed and certified by a structural engineer for each specific opening per AS 4100 and AS 3700.