Class code 3307: Heat Treating Metal
Class 3307 is the NCCI workers' comp code for “Heat Treating Metal”.
The facts
- Official wording (NCCI)
- Heat Treating Metal
- Industry group (our dictionary)
- Manufacturing—Metal & Machine
- Hazard group
- Not listed in our dictionary
- State codes that differ
- None in our dictionary
- Line
- Workers' comp
What it means
Class 3307 is the code carriers use to rate workers' comp payroll for this kind of work.
Who writes class 3307, state by state
From our live eligibility engine, refreshed every day (page updated November 1, 2026). It shows who has appetite, not a price. The final decision is always the carrier's underwriter.
Instant quote available 47
By email or underwriter only 0
No market listed yet 0
State fund only 4
North Dakota (North Dakota Workforce Safety & Insurance) · Ohio (Ohio Bureau of Workers' Compensation) · Washington (Washington Department of Labor & Industries) · Wyoming (Wyoming Department of Workforce Services)
Carriers with appetite for class 3307
- Travelers · 46 states · instant quote
- Employers · 45 states · instant quote
- AmTrust · 43 states · instant quote
- CopperPoint · 19 states · instant quote
- Clear Spring · 47 states
- PIE- Sirius America Insurance Company · 47 states
- V3- National Liability & Fire Insurance Company · 47 states
- Trean / 7710 Insurance · 46 states
- Trean / American Liberty Insurance Company · 46 states
- Amerisafe · 28 states
- Omaha National · 28 states
- Accident Fund Insurance Company Of America · 5 states
What does class code 3307 cover?
Class 3307 is the NCCI workers' comp code for “Heat Treating Metal”. Carriers use it to rate the payroll of people doing this kind of work.
Who writes class code 3307 workers' comp?
In our live appetite data (updated November 1, 2026), 12 carriers have appetite for class 3307 in at least one state, and 4 of them quote it instantly. An instant quote is available in 47 states. The final decision is always the carrier's underwriter.
Does every state use class code 3307?
Our dictionary lists no different code for California, Delaware, Michigan, New Jersey, New York, Pennsylvania or Texas. North Dakota, Ohio, Washington and Wyoming write workers' comp through the state fund.