Cold forged and threaded

Seat back lock fasteners

Specifications of International Thread Standards

Cold forging fasteners and nuts

The most frequently used thread standard is the metric ISO Thread. However, there are other thread standards as well. These are either based on foreign standards or are used for special applications. E.G. in the medical technology in aeronautical engineering or astronautics.

The most common threads are:

ISO Thread (metric)
Whitworth Thread
Pipe Thread
Trapezoidal Thread
Knuckle Thread
Buttress Thread

Abbreviation	Country	Thread Angle ( ° )	Description
ISO		60°	International Organization for Standardization
NC	USA	60°	National Coarse
UNC	USA	60°	Unified National Coarse
NF	USA	60°	National Fine
UNF	USA	60°	Unified National Fine
UNEF	USA	60°	Unified National Extra Fine
UN	USA	60°	Unified National 8-,12- and 16 pitch series
UNS	USA	60°	Special Threads of American National Form
NPT	USA	60°	National Taper Pipe 1:16
NPTF	USA	60°	National Taper Pipe Dry seal 1:16
NPS	USA	60°	National Standard Straight Pipe
NPSM	USA	60°	National Standard Straight Pipe for free fitting mechanical
NPSF	USA	60°	National Standard Internal Straight Pipe Dry seal
BSW	GB	55°	British Standard With worth Coarse
BSF	GB	55°	British Standard Fine
BSP	GB	55°	British Standard Pipe
BSPT	GB	55°	British Standard Pipe Taper
BA	GB	47°	British Standard Association

	ISO Metric Fine Thread		BSF Threads
	ISO Metric Coarse Thread		BSW Threads
	UNC Threads		BSP Threads
	UNF Threads		BSPT Threads
	UNEF Threads		Pg Thread
	NPT Thread		Löwenherz Thread
	NPTF Thread		Knuckle Thread
	8-UN Thread		Sewing Machine Thread (Nähnorm 100)
	12-UN Thread		C.E.I.-Thread (Cycle Engineer Institution Thread)
	16-UN Thread		Customized Thread

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