Material	Code	Thread Size in Metric	Thread Size in Unified
Steel with Zinc Plated	FH	M3-M10	#2-56 ~ #5/16-18
Stainless Steel 304	FHS	M3-M10	#2-56 ~ #5/16-18
Stainless Steel 416	FH4	M3-M6	#4-40 ~ #10-24
Aluminum	FHA	M3-M8	#2-56 ~ #5/16-18
Low-displacement Head	FHL/FHLS	M2.5-M5	#2-56 ~ #10-32
Non-Flush Head	TFH	M3-M5	#2-56 ~ #8-32
High-Strength Stud for thin sheet	HFE	M5-M8	#10-32 ~ #5/16-18
High-Stength Stud	HFH/HFHB/HFHS	M5-M10	#10-32 ~ #3/8-16

 

 

Length is available