8" & 10" Double Bitt Bollards Without Horns for Barge Mooring | ASTM A27 Grade 70-36 Cast Steel

Product Overview

The ASTM A27-70-36 cast steel double bitt without horns is a compact two-post mooring fitting used on North American inland barges, push boats, towboats, workboats, and small service vessels. It is welded to the deck or suitable mounting structure and provides a secured point for mooring lines or wire lines used during barge coupling, checking, positioning, and harbor mooring operations.

This page is focused on the 8 inch and 10 inch cast steel double bitt without horns. The no-horn configuration is selected when the vessel arrangement requires a clean two-post bitt profile without additional horn projections. Because this is a cast steel deck fitting, casting soundness, heat treatment, NDT scope, deck weld preparation, and project load verification are more important than general appearance claims.

Quick Specifications

• Product type: cast steel double bitt without horns → two-post mooring fitting for inland barge and small vessel deck arrangements.
• Size range: 8 in and 10 in → selected by line size, deck layout, and project load basis.
• Application focus: North American inland barges, push boats, towboats, workboats, and small service vessels → not positioned as a general ocean-going bollard page.
• Material grade: ASTM A27-70-36 cast steel → carbon steel casting grade commonly used for cast marine deck hardware.
• Cast construction: sand casting with heat treatment → process control is important at post roots, base transitions, and line-contact areas.
• Quality control: RT, MT, dimensional inspection, and pull load test can be arranged → final inspection scope and acceptance criteria should be confirmed before order.
• Surface treatment: as-cast / weld-ready finish, Sa2.5 blasting + epoxy shop primer, galvanized finish, or customized finish → paint-free weld zones may be required by the shipyard.
• Certificate scope: mill certificate, maker certificate, ABS approval, or class certificate can be arranged according to project requirement → not supplied as default unless confirmed in the order.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm double bitt without horns and select 8 in or 10 in according to vessel arrangement, line size, and deck space.

Step 2: Confirm the application: inland barge, push boat, towboat, workboat, or small vessel, including bow, stern, gunnel, or deck installation position.

Step 3: Confirm mooring / coupling / checking use, rope or wire type, load direction, and project load basis. Strength calculation can be prepared after these details are confirmed.

Step 4: Confirm material requirement: ASTM A27-70-36 cast steel, cast stainless steel, fabricated mild steel, or stainless steel plate for other bitt types if required.

Step 5: Confirm casting and inspection scope: heat treatment, RT, MT, dimensional inspection, pull load test, witness inspection, and acceptance criteria.

Step 6: Confirm surface treatment, quantity, delivery destination, required delivery time, GA drawing, foundation drawing, and real deck installation photos if available.

Structure

Twin cast steel bitt posts | Common cast base | Without horn projections | Line-contact surface | Post-to-base transition | Deck welding interface | Optional coating or weld-ready finish

Casting, Testing & Engineering Advantages

• Sand-cast steel body allows the two bitt posts and base transition to be produced as one casting, reducing fabricated welds in the main post area.
• Heat treatment can be applied to support the required material condition for ASTM A27-70-36 cast steel according to the agreed specification.
• The post root and base transition are key casting areas; RT or MT can be arranged to check critical zones where shrinkage, cracks, or linear indications would be unacceptable.
• Strength calculation or FEA-based review can be provided when the customer confirms the line load, deck reinforcement, weld arrangement, and installation drawing.
• Pull load test can be arranged according to agreed test procedure, load direction, fixture arrangement, and acceptance criteria.
• Line-contact areas and edges should be dressed smooth to reduce rope abrasion and remove burrs that may cut mooring rope.
• For US inland barge use, a weld-ready or unpainted weld-zone condition can be supplied when required by the shipyard; primer or final coating should be confirmed before painting.

Custom Attributes

• Standard / Market Reference: ASTM A27-70-36 cast steel double bitt → common North American barge hardware reference, not a JIS or CB standard page.
• Size: 8 in / 10 in → selected by vessel arrangement, line size, load basis, and deck foundation.
• Horn Configuration: without horns → suitable when a clean twin-post profile is required and no horn projection is specified.
• Application Region: USA and Americas inland waterways → mainly for inland barges, push boats, towboats, workboats, and small vessels.
• Material: ASTM A27-70-36 cast steel → material certificate and heat treatment record can be provided according to order scope.
• Quality Control: RT / MT / strength calculation / pull load test → available when inspection level, test load, direction, fixture, and acceptance criteria are confirmed.
• Surface Treatment: as-cast, Sa2.5 blasting + epoxy shop primer, galvanized finish, or customized finish → weld area and coating boundary should be confirmed with the shipyard.
• Certificate Requirement: ABS approval, mill certificate, maker certificate, or class certificate → available according to project requirement and not assumed as default.

How It Works

Mooring or checking line approaches the bitt → Line is turned around the twin posts according to vessel practice → Contact load is transferred through the cast posts and base → Welded deck structure and reinforcement carry the final load → Inspection and coating are completed according to project requirement

Applications

North American inland barges | River barges | Push boats | Towboats | Workboats | Small service vessels | Barge coupling stations | Bow and stern corner mooring positions | Gunnel-mounted line handling positions

Certifications & Advantages

Certificates can be arranged according to project requirement, material traceability, inspection witnessing, and class approval procedure.

Certification: CCS, NK, BV, ABS, DNV, LR, KR, IRS, RS, RINA, CRS, Makers Test Certificate.

For US inland barge projects, ABS approval, mill certificate, material certificate, heat treatment record, NDT report, and pull test report should be specified before quotation if required.

Drawing & Photos

FAQ

Q1: Is this double bitt suitable for ocean-going vessels?

A1: This page is positioned for US and Americas inland barges, push boats, towboats, workboats, and small service vessels. For ocean-going ships or classed offshore mooring systems, load basis, deck reinforcement, class rules, and alternative bollard standards should be reviewed before selection.

Q2: What is the difference between double bitt without horns and with horns?

A2: The without-horns type has two vertical bitt posts without additional side horn projections. It is selected when the deck arrangement or line-handling practice requires a cleaner twin-post profile. With-horns versions should be quoted separately when specified.

Q3: Can RT, MT, strength calculation, and pull load test be provided?

A3: Yes. RT, MT, strength calculation, and pull load test can be arranged according to project requirement. The customer should confirm load direction, test load, test fixture, acceptance criteria, witness requirement, and deck installation details before production.