--- title: "What Are Ball-Ended Thrust Screws Used For?" description: "Ball-Ended Thrust Screws (Trade series (ball-ended thrust screws)) are used for applying adjustable thrust through a swiveling ball tip without fixing the co…" url: https://engineeringhardware.com/applications/ball-ended-thrust-screws/ source: Engineering Hardware & Fasteners --- # What Are Ball-Ended Thrust Screws Used For? Screws · Trade series (ball-ended thrust screws) · Application guide Typical applications, the industries that specify ball-ended thrust screws, and how to choose the right size, material and finish for the joint. Ball-Ended Thrust Screws are used for applying adjustable thrust through a swiveling ball tip without fixing the contact angle. They are manufactured to Trade series (ball-ended thrust screws), and the choice of size, property class and finish is driven by the load in the joint and the environment it sits in. - **Primary duty:** Applying adjustable thrust through a swiveling ball tip without fixing the contact angle - **Governing standard:** Trade series (ball-ended thrust screws) - **Screw size range:** 1/4-20 to M5×0.8 - **Category:** Screws Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation. ![What Are Ball-Ended Thrust Screws Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Ball-Ended-Thrust-Screws.webp) Ball-Ended Thrust Screws are used primarily for applying adjustable thrust through a swiveling ball tip without fixing the contact angle. This page lists the industries and assemblies where they are specified, the selection criteria that matter for each application, installation practice, and the cases where a different fastener type is the correct choice. Parts are supplied to Trade series (ball-ended thrust screws). Stocked across roughly 1 to 5, they cover light-duty and instrument-scale work. ## Typical Applications for Ball-Ended Thrust Screws The most common settings where these are specified: - **Machine fixtures:** A swiveling ball tip contacts an angled workpiece without gouging it. - **Clamping mechanisms:** Ball-ended screws distribute point contact during adjustment. - **Alignment tooling:** Metric and inch lengths suit small stops and supports. - **Optical equipment:** Black-oxide alloy steel provides a compact adjustment point. 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This product spans 1–5; check the full table below for the exact dimensions of each size. - **Drive & head:** Pick the drive (socket, cross, slot) and head style for the tool access and seating surface; a recessed drive resists cam-out under power tools. - **Environment:** For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient. - **Standard:** This product is supplied to Trade series (ball-ended thrust screws). Quoting the standard on your order guarantees interchangeable dimensions between suppliers. ## Installation & Assembly Practice - Match the driver exactly to the recess (PH ≠ PZ; hex key sizes per ISO 2936) and keep the tool axial — side load is the main cause of stripped drives. - In tapped holes, engage a thread length of at least 1× the nominal diameter in steel, 2× in aluminum. - Set power tools to a torque that seats the head without embedding it into the mating surface. ## Common Selection Mistakes with Ball-Ended Thrust Screws - Under-sizing the drive for the installation torque — a small recess at high torque strips before the screw is seated. - Using a countersunk head in thin sheet where the countersink removes most of the load-bearing material. - Specifying stainless in high-strength duty: A2-70 is roughly class 7 steel, not a 10.9 substitute. ## Where Ball-Ended Thrust Screws Are Not the Right Choice Not for high-preload structural joints (use a property-class bolt and nut), and not in thin sheet where a self-drilling or self-tapping type suits better. Custom manufacturing · Made to drawing ## Need a ball-ended thrust screws outside the standard range? Material and finish are usually what drives a special — a grade the standard part is not stocked in, or a coating chosen against a salt-spray figure instead of a default. Made by cold heading or warm forging. Minimum order from 2,000 pieces; samples within 7 days of drawing approval. [Custom screw manufacturing](https://engineeringhardware.com/custom/screws/)[Send a drawing](https://engineeringhardware.com/custom/screws/#rfq) ## Technical Drawing Dimensioned line drawing of 1/4-20 Ball-Ended Thrust Screws to Trade series (ball-ended thrust screws). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected. - **Length options:** 1/2 or 3/4 in - **Tip diameter:** 0.157 in - **Drive size:** 1/8 in - **Tip action:** 360-degree swiveling ball - **Hardness:** Rockwell C32 ## Dimensions & Specifications (Trade series (ball-ended thrust screws)) | Thread size | Length options | Tip diameter | Drive size | Tip action | Hardness | | --- | --- | --- | --- | --- | --- | | 1/4-20 | 1/2 or 3/4 in | 0.157 in | 1/8 in | 360-degree swiveling ball | Rockwell C32 | | M3×0.5 | 5 / 7.5 / 10 mm | 1.5 mm | 1.5 mm | 360-degree swiveling ball | Rockwell C39 | | M4×0.7 | 6 / 8 / 10 / 12 / 16 mm | 2.5 mm | 2 mm | 360-degree swiveling ball | Rockwell C39 | | M5×0.8 | 8 / 10 mm | 3 mm | 2.5 mm | 360-degree swiveling ball | Rockwell C39 | Inside the plant ## Manufactured in our own plant This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided. 1. ![Wire rod feeding into a cold heading machine](https://engineeringhardware.com/wp-content/uploads/2026/08/09-wire-rod-feed-cold-heading-machine.webp) 01 **Cold heading** Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail. Head dimensions and under-head radius checked at set-up and per shift. 2. ![Thread rolling machine producing bolt threads](https://engineeringhardware.com/wp-content/uploads/2026/08/03-thread-rolling-machine-bolt-production.webp) 02 **Thread rolling** Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch. Go / no-go ring gauges to ISO 965 tolerance class 6g. 3. ![Baskets of bolts staged for heat treatment](https://engineeringhardware.com/wp-content/uploads/2026/08/05-heat-treatment-baskets-black-bolts.webp) 03 **Heat treatment** Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it. Core hardness and tensile tested per lot to ISO 898-1. 4. ![Zinc plated bolts in a treatment basket](https://engineeringhardware.com/wp-content/uploads/2026/08/23-zinc-plated-bolts-treatment-basket.webp) 04 **Surface treatment** Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list. Coating thickness and neutral salt spray hours to ISO 9227. ## Frequently Asked Questions ### What drive type do Ball-Ended Thrust Screws use? Drive depends on the head style — socket (hex key), cross (Phillips/Pozi) or slot. A recessed drive resists cam-out when driven with power tools; check the product head style on this page. ### What material should Ball-Ended Thrust Screws be for outdoor use? For damp, coastal or chemical environments specify A4 (316) stainless or a suitably coated steel. For indoor or dry use, A2 (304) stainless or zinc-plated steel is normally adequate. ### Are Ball-Ended Thrust Screws made to a recognized standard? Yes — they are manufactured to Trade series (ball-ended thrust screws), so dimensions are interchangeable between suppliers when you quote the standard on your order. ### What are Ball-Ended Thrust Screws used for? Applying adjustable thrust through a swiveling ball tip without fixing the contact angle. They are supplied to Trade series (ball-ended thrust screws). ### Can I get a quote for Ball-Ended Thrust Screws in the size and material I need? Yes. Use the technical drawing and quote form on this page to set the size and options, then send the exact configuration to our team for pricing and lead time. ## Related Pages Product page: [Ball-Ended Thrust Screws — specifications & sizes](https://engineeringhardware.com/fastener/ball-ended-thrust-screws/) ### Ball-Ended Thrust Screws Specification Guides ### Related Fastener Applications