Part no.Internal ThreadInternal Thread ClassExternal ThreadExternal Thread ClassInsert Material
3320-6.00HWFM6-1.06H3/8-162BC12L14 Carbon Steel
3320-8.00HWFM8-1.256H1/2-132BC12L14 Carbon Steel
3320-10.00HWFM10-1.56H9/16-122BC12L14 Carbon Steel
3321-10.00HWFM10-1.256H9/16-122BC12L14 Carbon Steel
3320-12.00HWFM12-1.756H3/4-102BC12L14 Carbon Steel
3320-16.00HWFM16-2.06H1-82BC12L14 Carbon Steel