Precision Screw
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PRECISION SCREW ASSEMBLIES

In 1969, Joseph H. Nook Jr. founded Nook Industries, Inc., intending to become a global supplier of Linear Motion components. Ball screws, both rolled and ground, were the cornerstone products in the early 1970’s, putting Nook Industries on the map as a successful business and a trusted company. Through the years, Nook Industries has served as a solid manufacturer of engineering products. From the very first ball screws of the 1960’s and 1970’s to the very latest technologies, Nook Industries strives to provide customers with the highest quality products and proven technology. Companies...

PRECISION BALL SCREW ASSEMBLIES NRS™ ROLLER SCREWS 174-195 Pairing traditional and proven design with the latest technology, Nook Industries manufactures products that customers value. The expansion of product lines and the development of application specific components and engineered systems have propelled Nook Industries to the forefront of the industry. Nook Industries is committed to customer satisfaction and providing high-quality, high-value products that are delivered on time at a competitive price. END MACHINING AND BEARING SUPPORT 196-213 PRECISION BALL SPLINE ASSEMBLIES The...

QUALITY HISTORY Since 1969, Nook Industries, Inc. has relentlessly and continuously developed the capabilities and skills to deliver products of the highest quality. Knowledge of testing and design, coupled with this experience working with stringent customer requirements in aerospace, medical, energy and military applications has provided the background to be a reliable partner. INSPECTION CAPABILITY Laser Lead Measurement - Precise lead error gauging is utilized to validate processes to conform to Nook internal specifications and customer requirements. HIGH TECH QUALITY EXPERIENCE When...

NOOK QUALITY EVOLUTION DEVELOPED MANUFACTURING SYSTEMS QUALITY TOOLS: • • • • • • • • Design for Six Sigma manufacturing D.O.E. (Design of Experiments) APQP (Advanced Product Quality Planning) DFMEA, PFEMA FEA (Finite Element Analysis) DVP&R (Design Verification Plan & Report) Reliability Testing Process validation to 21 CFR Part 82 (Medical Device) QUALITY SYSTEMS AND ACCREDITATIONS SUPPLY CHAIN APPROVAL PROCESS STATE OF THE ART MANAGEMENT SYSTEMS TESTING Efficiency Measurement - Nook Engineering has designed test machines to measure and validate screw assembly efficiency. APQP LAUNCH...

Nook acme screws are used in a variety of military applications NOOK ACME SCREWS

ACME SCREWS nookindustries.com The specifications and data in this publication are believed to be accurate and reliable. However, it is the responsibility of the product user to determine the suitability of Nook Industries products for a specific application. While defective products will be replaced without charge if promptly returned, no liability is assumed beyond such replacement.

ACME SCREWs and nuts Materials & MANUFACTURING Manufacturing process photo Nook acme screws are used in a variety of packaging applications Nook Industries manufactures precision acme screws by thread rolling, thread milling, or thread grinding processes. Each process produces high precision screws. Nook acme screw products feature centralizing thread forms for smooth, no-wedging performance. ROLLED ACME SCREWS Nook offers the largest selection of rolled acme screw sizes in the industry. Rolled thread screws are cost effective and are stocked for quick delivery. MILLED ACME SCREWS Milled...

ACME SCREWS ACME Screw ENGINEERING Mobile rocket launching system SCREW TYPE THREAD CLASS LEAD ACCURACY Rolled Milled Ground ACME & TRAPEZOIDAL ALLOY Screw Material SCREW LENGTHS Limited only by material availability Limited only by material availability STAINLESS STEEL Tensile Ultimate Stength Black Oxide Minimum Hardness Materials used in Nook acme nuts have been selected for low friction, minimum wear, long life, and clean operation. BRONZE ACME & TRAPEZOIDAL NUT Special high tensile bronze is selected for our smooth running, anti-wedging bronze nuts. • Material: Nook Bronze • Tensile...

GLOSSARY AND TECHNICAL DATA Acme thread form terms THREAD TYPES - The acme thread form, established over 100 years ago, replaced square thread screws, which had straight-sided flanks and were difficult to manufacture. There are three main classes of Acme thread forms: General Purpose (G), Centralizing (C), and Stub Acme. The General Purpose and Centralizing thread forms have a nominal depth of thread of 0.50 × pitch and have a 29° included thread angle. Some Nook sizes have 40° included angle. Trapezoidal thread forms have a 30° included thread angle. When compared to general-purpose thread...

ACME SCREWS ACME Screw ENGINEERING FIG. 2 Single Start (Lead = Pitch) Double Start (Lead = 2 × Pitch) Four Start (Lead = 4 × Pitch) Lead Lead Pitch and Lead LAND (MAJOR) DIAMETER - The outside diameter of the screw. PITCH DIAMETER - On an acme screw, this diameter is approximately halfway between the land diameter and the root diameter. It is the diameter at which the thread thickness is equal to the space between threads. ROOT (MINOR) DIAMETER - The diameter of the screw measured at the bottom of the thread. PITCH - The axial distance between threads. Pitch is equal to the lead in a single...

GLOSSARY AND TECHNICAL DATA continued MATCHED LEAD - When multiple screws are used to move a load with precise synchronicity, screws of similar lead accuracy can be factory selected and supplied as sets. Consult factory for matched lead set tolerances. FIG. 3 Adjustable backlash nut assembly STANDARD NUT STRAIGHTNESS - Although PowerAc™ Acme Screws are manufactured from straight, cylindrical material, internal stresses may cause the material to bend or yield. STANDARD FLANGE NO-LASH™ FLANGE STANDARD NUT When ordering random lengths or cut material without end machining, straightening is...