“ONE MILIMETRE IN THE MANUFACTURING OF A SURF BOARD IS THE DIFFERENCE BETWEEN RIDING THE WAVE OR SINKING TO THE BOTTOM.” Taj Burrow WORLD SURF CHAMPION 2006

SCREWS AND NUTS INTRODUCTION Screws transform a rotation movement into a transfer and vice versa; the latter depends on the type of screw and its dimensions. NIASA offers an extensive range of screws for all types of applications, within sectors as varied as tool machining, aeronautics, transport and handling industry, renewable energies, etc. In this section you will find the most suitable screw for practically any requirement, regardless of size, load, speed, precision, efficiency, etc. requirements. NIASA quality standards guarantee the highest levels of reliability on the entire range of...

General product overview

according to NIASA standard according to NIASA standard page 235 page 236 page 237

ROLLED BALL SCREWS KGS BALLS Cold pressed with no stock removal, with thermal treatment and polishing. Please ask NIASA about the supply of machined screws with stock removal and tempered, with tolerance class up to P0, and also for stainless materials. NIASA manufactures screws with their sides machined according to your requirements. Please also ask if any thermal treatment is required. Out of stock there are also manyd0 Ø other screw diameters/pitches available, also with left thread. Also for several types of nuts (with threaded body, etc). Standard material Approx. surface hardness 60 HRC...

i Axial inertia moment (mm4) lmax Maximum length approx. (mm) Standard tolerance class Thread entries Ip Polar inertia moment (mm4) a Transversal section area (mm2) d2 Interior thread diameter (mm) Nut type Available in stock

NUT WITH KGF-D FLANGE Out of stock there are also many other screw diameters/pitches available, also with left thread. Also for several types of nuts (with threaded body etc). Safety screws can also be supplied in combination with standard screws. DDxL,„ ,. DDxL,„ Drilled template 1 Drilled template 2 . . . , Mm. elastic limit Mm. resistance to breakage . . . Standard material _ „ _ „ * Approx. hardness treatment Its dimensions are not consistent with DIN 69051 / 21 Rounded flange

NUT WITH KGF-N FLANGE KGS BALLS Dimensions according to NIASA standard Safety screws can also be supplied in combination with standard screws. Out of stock there are also many other screw diameters/pitches available, also with left thread. Also for several types of nuts (with threaded body, etc). Standard material Approx. hardness treatment Ca0m Modified static load capacity (kN) Cam Modified dynamic load capacity (kN) Loaded ball turns Axial backlash nominal (mm) Thread entries Drilled template Rounded flange www.n ias a.es

KGM-D CYLINDRICAL NUT KGS BALLS Dimensions according to DIN 69051 Out of stock there are also many other screw diameters/pitches available, also with left thread. Also for several types of nuts (with threaded body, etc). Safety screws can also be supplied in combination with standard screws. SHAPE - E Min. elastic limit Re (N/mm2) Approx. hardness treatment Standard material Thread entries Nominal axial backlash (mm) Loaded ball turns Cam Modified dynamic load capacity (kN) Ca0m Modified static load capacity (kN) Lubrication orifice in any position on the circumference www.n ias a.es

Dimensions according to NIASA Out of stock there are also many other screw diameters/pitches available, also with left thread. Also for several types of nuts (with threaded body etc). Safety screws can also be supplied in combination with standard screws

BALL SCREW TECHNICAL SPECIFICATIONS PARTS AND RECIRCULATION The systems with ball screws are basically made up of the screw itself, a nut and a series of balls that roll between both elements, re-circulating through the nut. Protectors (scrapers) on their sides avoid the possible input of foreign bodies or aggressive products to the inside of the nut. The geometric precision of the return is essential so that the rolling of the balls occurs with minimal friction. For short pitches, returns by radial deflector are often used, on which each circuit is independent and makes a complete turn. For...

Assembly position Service temperature The screw can be mounted in any position, paying special care to the possible lateral loads that are not supported by the screw itself, but by guide elements designed for this purpose. In general, the ambient operating temperature of the screws and ball nuts must be between -30ºC and +80ºC, with the exceptional possibility of working at higher temperatures (contact NIASA). Thread profile NIASA screws and ball nuts are symmetric gothic arch (ogival arch), and the load angle is 45º. This design means that the roller is extremely smooth (optimal efficiency),...

BALL SCREW TECHNICAL SPECIFICATIONS Pre-loaded nuts The level of precision in the positioning can be increased, at the same time as reducing backlash, by pre-loading the balls of a pair of nuts. Pre-loading also increases rigidity in the nut area. The standard value of the pre-load is 10% of the dynamic load and it is recommended not to surpass one third of the dynamic load value. The customer is advised to indicate the pre-load value depending on the type of application. The pre-load can be obtained by separating or joining the balls from the pair of nuts. In the first case the screw will have...

Preload with two nuts with KGF flange Preload with a nut with KGF flange and with a KGM cylindrical screw Preload with two KGM cylindrical screws READJUST THE PRELOAD To readjust the preload of a pair of nuts, follow the procedure below: 1. Separate the two nuts and remove the two halves of the washers. 2. Place gauges on three points (at approx. 120º) between the nuts, until the keyways of both are aligned. 3. Measure the turning torque of the nuts and change the gauges until the desired value is obtained. 4. Machine the washers with the thickness of the gauges defined at the previous point.