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Table of Contents

Table of Contents

Figure 1. Thread Forms/Standards for Linear Power Transmission Tools
Thread Form	Image [6]	Description	Usage	Standard
Trapezoidal		Trapezoidal outlines High strength and ease of manufacturing 30° flank angle	Used for leadscrews (power screws) Used where large loads are required (vice, lathe)
British and American Standard General Purpose ACME		Thread height is half the pitch length and flattened 29° flank angle	Used for leadscrews (power screws) Used where large loads are required (vice, lathe)	ASME B1.5-1997 (R2014)
American Standard STUB ACME		Same as ACME except different height [1]	Used for leadscrews (power screws) Used where large loads are required (vice, lathe)	ASME B1.5-1997 (R2014)
BUTTRESS (Continental)		Asymmetric thread form Allows for low friction, withstands greater loads in one direction, but higher friction and inferior load bearing in the opposite One side at a slant typically less than 7°, while the other is at an angle typically at 45° Continental BUTTRESS thread form has 45°/5°	Used in the construction of artillery Used in jacks, lifts, hydraulic sealing Applications in automotive to water and sewer	ANSI/ASME B1.9-1973 (R2017)
British Standard BUTTRESS		45°/7°	Used in the construction of artillery Used in jacks, lifts, hydraulic sealing Applications in automotive to water and sewer
American National BUTTRESS		45°/7°, but internal threads are flat [2]	Used in the construction of artillery Used in jacks, lifts, hydraulic sealing Applications in automotive to water and sewer

Standard Lead Precision Ball Screw				Standard Lead Rolled Ball Screw
Standard Type equipped with Shaft		Standard Nut Type		Standard Nut Type	Rolled Shaft and Nut Standard off-the-shelf Type
Shaft end unfinished type Models MDK, MBF, BNF, BIF and BNFN	Shaft end finished type Model BNK	Preload type Models SBN, DIK, DKN, BIF and BNFN	Non-preload type Models HBN, DK, BNF and BNT	Preload type Model JPF	Non-preload type Models MTF, BTK and BNT
BIF Image Modified	Image Modified	SBN Image Modified		Image Modified	BTK Image Modified
MDK & MBF Image Modified		BIF Image Modified			MTF Image Modified
BNF Image Modified		DIK Image Modified			BNT Image Modified
		DKN Image Modified
		BNFN Image Modified

Large-Lead Precision Ball Screw

Large-Lead Rolled
Ball Screw

Standard Nut Type

Rolled Shaft and Nut
Standard off-the-shelf Type

Preload type

Models SBK and BLW

Non-preload type
Models BLK and WGF

Non-preload type
Models BLK, WTF and CNF

BLW

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Image Added

BLK & WGF

Image Modified

Image Removed

BLK/WTF

Image Added

SBK

Image Added

Image Removed

CNF

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Rotary Nut Series
Rotary Nut Precision Ball Screw		Rotary Nut Rolled Ball Screw	Ball Screws/Splines
Standard-lead, preload type Model DIR	Large-lead, non-preload type Model BLR	Large-lead, non-preload type Model BLR	Stroke, rotation type Models BNS and BNS-A	Stroke type Models NS and NS-A
Image Modified	Image Modified	Image Modified	BNS Image Modified	NS Image Modified
Image Modified	Image Modified	Image Modified	BNS-A Image Modified	NSA Image Modified

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