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Pit Furnaces

AFC-Holcroft Pit Furnaces – reliable, vertical heat-treat systems for deep-case and tall-part applications

Product details

  • Furnace DesignVertical, gas-tight construction for deep and long components
  • Load CapacityUp to 15,000 lb (6,800 kg)
  • Heating SystemGas-fired or electric radiant-tube configurations
  • Atmosphere Circulation SystemIntegrated fans for uniform temperature and atmosphere control
  • Quench System OptionsOil, water, polymer, or molten salt
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Pit Furnaces
Rugged vertical design for long components and deep-case hardening

Built for longevity and process precision, AFC-Holcroft Pit Furnaces provide the reliability demanded by industries treating long or heavy loads. Each unit is constructed with a gas-tight shell, advanced insulation, and robust temperature-uniformity control. Available in single or multiple zones, they are suitable for a wide range of atmosphere-based processes and can be paired with oil, water, or polymer quench tanks to match the metallurgical application.

Additional technical features

  • Gas-fired or electric radiant-tube heating systems

  • Single or multi-zone temperature control for uniform processing

  • Heavy-duty alloy retorts and load baskets

  • High-efficiency recirculating fan for atmosphere mixing

  • Gas-tight top-seal design minimizes atmosphere loss and contamination

  • Integrated quench pit or external quench tank (oil, water, or polymer)

  • Optional nitriding and nitrocarburizing configurations with ammonia control and gas analysis

  • Full automation compatibility for temperature, carbon potential, and process sequencing

AUPL

Key Benefits for Your Operations

Excellent Temperature Uniformity
Delivers consistent heating performance for reliable and repeatable thermal processing.

Flexible Load Capacity
Handles a wide range of part sizes, weights, and production volumes with customizable configurations.

Efficient Vertical Design
Compact pit-style layout maximizes floor space while supporting deep or long workpieces.

Reliable Atmosphere Control
Advanced control systems maintain precise process conditions and part quality.

Durable, Low-Maintenance Construction
Heavy-duty design and accessible components help reduce downtime and simplify maintenance.

Technical Data
Pit Furnace Specifications

The following table outlines key system specifications and configuration options.

Gallery
Our Service & Support
Reliable service throughout your entire system lifecycle

We support our customers throughout the entire lifecycle of their systems – from commissioning to ongoing operation, modernization and digital integration.

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Questions & Answers
FAQ – AFC-Holcroft Pit Furnaces
A vertical heat-treating furnace designed to process long or heavy parts, typically loaded into a below-floor chamber for deep-case hardening or nitriding.<br>
Processes requiring uniform heat and atmosphere around tall components — such as gears, shafts, or spindles — where traditional horizontal systems cannot accommodate the load.<br>
Yes. Pit furnaces can perform carburizing, carbonitriding, nitriding, ferritic nitrocarburizing, annealing, and tempering, depending on the selected configuration.<br>
Oil, water, polymer, and molten-salt quench systems can be integrated below the furnace or externally positioned.<br>
Yes. Systems can include automated cover lifts, load handling, atmosphere control, and process data acquisition for fully monitored operation.<br>
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