Thread Rolls for the A3 Head

Dimensions
Helix angle in Head = 2° 40'	A	D1	D2	D3	D4	D5 max	L1	L2	P	?
Allowable Component Lead	inches	4.600	1.500	1.25 / 1.5	0.870	5.157	3.540	3.270	0.160	60°
Angle = 1° 35' - 3° 30'	mm	117	38	30 / 40	22	131	89	83	4	A
A
The following Thread Rolls may be ordered as standard on the A3 head
A
ISO Metric			Unified Coarse UNC					Whitworth BSW
A
Nominal Size x Pitch mm			Nominal Size x TPI					Nominal Size x TPI
M 12.0 - M 14.0 x 1.75			7/16 x 14					7/16 x 14
M 14.0 - M 16.0 x 2.0			1/2 x 13					1/2 - 9/16 x 12
M 18.0 - M 20.0 x 2.5			9/16 x 12					5/8 - 11/16 x 11
M 20.0 - M 22.0* x 2.5			5/8 x 11					3/4 x 10
			3/4 x 10					7/8* - 15/16* x 9
			7/8* x 9
A
ISO Metric Fine
								Whitworth Fine BSF
Nominal Size x Pitch mm			Unified Fine UNF
M 12.0 - M 14.0 x 1.5								Nominal Size x TPI
M 14.0 - M 16.0 x 1.5			Nominal Size x TPI					7/16 x 18
M 18.0 - M 20.0 x 2.0			7/16 - 1/2 x 20					1/2 - 9/16 x 16
M 20.0 - M 22.0* x 2.0			9/16 - 5/8 x 18					5/8 - 11/16 x 14
								3/4 x 12
								7/8* - 15/16* x 11
								A
								A
								A
								Whitworth Pipe BSP
								A
								Nominal Size x TPI
								G 1/4 x 19
								G 1/2 x 14

* For short threads up to 0.945" length including thread run out.

Testimonials

"The introduction of Namco thread rolling heads has enabled us to significantly reduce our costs through shorter cycle times, less changeovers and increased quality.

The team at Namco is very knowledgable and has helped us tackle major production challenges"

United Kingdom

We recommend NAMCO TOOLING LTD as a high quality manufacturer of precision thread rolls and chasers. NAMCO tools are manufactured in short time –with on time delivery and many rolls are stock items.
GRIP team

Namco’s Coventry Chasers are top quality and their stock is good. Deliveries are usually next day throughout the whole range.
Howard Lee