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Lindapter HB20-3 M20 Hollo-Bolt Size 3

Type HB Mild Steel Bright Zinc Plated

Lindapter

Product Code: 18HB203

Model Code: HB20-3

Brand: Lindapter

Finish: Zinc Plated


(Include VAT?)   

Boxes of 10
Individual Items

£42.29 inc VAT
( Priced Each )

OUT OF STOCK

Delivery expected in 2/3 days

Sorry! This product is only sold in multiples of 0.
Order by 2pm for Next Day Delivery (Mon-Fri)
Delivery Icon FREE Standard Delivery on Orders over £100*




STEEL CLAMPING SYSTEMS / HOLLOW SECTION BLIND FIXINGS

Lindapter Type HB20-3 Hexagonal Head Hollo-Bolt (M20 x 140mm)

The Lindapter Type HB20-3 Hollo-Bolt is an industry-leading, high-reliability structural blind fixing designed specifically for executing connections to rectangular, square, or circular steel hollow shape sections where access is restricted to one side only. Expertly engineered from robust carbon steel, this heavy-duty M20 cavity fastener features an expanding sleeve and interlocking grooved cone mechanism that prevents loosening over long-term structural lifespans. This extended length variant (Size 3) provides an engineered clamping range of 60mm to 86mm, serving as a non-destructive, time-saving alternative to traditional structural beam welding or specialised through-bolting practices.

CRITICAL STRUCTURAL MANDATE: DRILLING & TORQUE PROTOCOLS

To fully comply with certified design configurations and achieve published load limits, clearance holes must be drilled through the pre-drilled fixture and structural profile to a precise diameter of 33mm (+2.0 / -0.2mm). For structural safety, the outer ply section thickness (min t) must be at least 8mm. Ensure adjacent hole distances preserve a minimum pitch centre (min A) of 70mm and a definitive edge profile boundary clearance (min B) of 25mm. During on-site installation, firmly clamp the external base collar using an open-ended 46mm spanner. Utilising a calibrated manual torque wrench with a 30mm socket on the central hex bolt head, execute progressive tightening strictly to the designated mechanical threshold of 300 Nm.


TECHNICAL SPECIFICATION DRAWING & KEY DIMENSIONS

Lindapter Type HB20 hexagonal head Hollo-Bolt dimensional layout diagram
Key Dimension Description HB20-3 Value
Z Nominal Internal Bolt Size M20
W Clamping Thickness Grip Capacity 60 - 86 mm
B Maximum Extended Body Length 140 mm
H Exposed Hex Head Collar Height 22.5 mm
S Sleeve Outer Profile Diameter 32.75 mm
A/F Spanner Across Flats Interface 46 mm
D Main Collar Outside Diameter 51 mm

TECHNICAL DATA & DESIGN CAPACITIES

Specification Parameter Engineered Values & Structural Standards
Ambient Safe Tensile Load 40.0 kN held at a conservative 5:1 integrated safety factor limit
Ambient Safe Shear Load 35.0 kN held at a conservative 5:1 integrated safety factor limit
Eurocode 3 Tensile Resistance (Ft,rk) 124.0 kN characteristic baseline capacity (ETA-10/0416 certified structural limit)
Eurocode 3 Shear Resistance (Fv,rk) 211.0 kN characteristic baseline capacity (ETA-10/0416 certified structural limit)
Sleeve Material Performance Carbon Steel configuration delivering a material strength threshold of 400 N/mm²
Structural Dynamic Rating Fully tested and validated in compliance with EN 1993-1-9 structural parameters

KEY STRUCTURAL PERFORMANCE ADVANTAGES

  • One-Sided Blind Installation: Rapid connection deployment completely eliminates the logistical necessity for hollow section internal access provisions.
  • High Clamping Force Mechanism: Internal assembly incorporates an optimised high clamping force design specialised for heavy-duty structural M20 diameters.
  • Interlocking anti-loosening Cone: Integrated cone layout features surface grooves that physically lock the internal parts under full tightening torque limits.
  • Non-Destructive Integration: Fully eliminates generalised welding procedures, safeguarding initial beam structural profiles and anti-corrosion barrier coatings across connections.
Purchase Lindapter Hexagonal Head Hollo-Bolts
Data Sheet
Data Sheet
Installation Guide
Installation Guide


Logistics Excellence

Fast, Reliable Delivery Nationwide

Getting your heavy structural fixings, framing connectors, and site essentials to your workshop or straight to the job site exactly when you need them.

TRUCK

Standard Mainland Delivery

Our reliable baseline shipping network services core industrial hubs and regional sites across the UK mainland via premium tracked courier freight routes.

Shipping Rate £8.95 + VAT
FREE Standard Shipping on orders over £100!

Next Working Day Dispatch

Tight project deadlines. Secure premium prioritised material line allocations. Items are picked, palletised, and routed on premium rapid-transit cargo links.

Order Window Order by 2:00 PM (Mon-Fri)
Fast tracked transit for critical construction paths.
Active construction site framing and rapid transit transport delivery truck keeping builds moving

How We Keep Your Builds Moving

We partner with leading heavy industrial parcel and parcel-freight carriers across the country to maintain real-time tracking from our central warehouse shelves straight to your signature pad.

01.
Instant Hub Sorting: Approved orders pass straight to active pick queues via our localised automated barcode stock framework.
02.
Heavy Component Packing: Structural products are safely stored in industrial reinforced crates or strapped securely to custom pallets to fully safeguard fine threads and anti-corrosion zinc surfaces.
03.
Tailgate On-Site Offloading: Bulk shipments drop cleanly at your structural site boundary line via integrated tail-lift carrier transport systems.

Logistics Scope & Out-Of-Zone Shipments

Standard pricing arrays map explicitly to structural mainland UK postal grids. Supplementary transit routing variables, variable lead times, or specialised carrier adjustments apply across high-altitude or outlying maritime zones:

  • Scottish Highlands & Islands: Postcode structures matching KW, IV, PA, and PH configurations map to premium alternative transit grids. Please review checkout calculations for accurate real-time weights.
  • Northern Ireland, Isle of Man & Outer Channels: Specialised water-crossing logistical paths require clean custom manifesting lines.
  • Heavy Oversized Pallets: Extended multi-ply girder connectors, structural space straps, or high-volume masonry hangers exceeding standard bulk dimensions pass through dedicated heavy haulage grids.
*** NEED SPECIFIC AM DELIVERY TIMES OR SITE COORDINATION ARRANGEMENTS *** If your project features demanding time windows, unique site restrictions, or crane offload coordination, contact our central logistics team directly on 01707 375172 or email your schedule over to finalise arrangements.


 


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Our Address

Metro Fixings Ltd
Unit 3 Tewin Court, Tewin Road
Welwyn Garden City, AL7 1AU

Contact Details

Telephone: 01707 375172
Fax: No Fax
Email: sales@metrofixings.co.uk