--- title: "What Are Cross-Recess Screwdriver Bits (PH / PZ) Used For?" description: "Cross-Recess Screwdriver Bits (PH / PZ) (DIN 3126 / ISO 1173 (C6.3 hexagon drive)) are used for installing, adjusting or servicing the assembly rather than f…" url: https://engineeringhardware.com/applications/cross-recess-screwdriver-bits/ source: Engineering Hardware & Fasteners --- # What Are Cross-Recess Screwdriver Bits (PH / PZ) Used For? Tools · DIN 3126 / ISO 1173 (C6.3 hexagon drive) · Application guide Typical applications, the industries that specify cross-recess screwdriver bits (ph / pz), and how to choose the right size, material and finish for the joint. Cross-Recess Screwdriver Bits (PH / PZ) are used for installing, adjusting or servicing the assembly rather than forming part of it. They are manufactured to DIN 3126 / ISO 1173 (C6.3 hexagon drive), and selection is driven by the size designation, the fit and tolerance the assembly requires, and the service environment. - **Primary duty:** Installing, adjusting or servicing the assembly rather than forming part of it - **Governing standard:** DIN 3126 / ISO 1173 (C6.3 hexagon drive) - **Size designation range:** PZ1 to PZ3 - **Category:** Tools Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation. ![What Are Cross-Recess Screwdriver Bits (PH / PZ) Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Cross-Recess-Screwdriver-Bits.webp) Cross-Recess Screwdriver Bits (PH / PZ) (DIN 3126 / ISO 1173 (C6.3 hexagon drive)) are specified where the joint requires installing, adjusting or servicing the assembly rather than forming part of it. The sections below cover the typical end-uses by industry, the size and material decisions for each, assembly practice, and the applications this fastener type is not suited to. Stocked across roughly 1 to 3, they cover light-duty and instrument-scale work. ## Typical Applications for Cross-Recess Screwdriver Bits (PH / PZ) The most common settings where these are specified: - **General machine building:** fastening covers, brackets, motors and sub-assemblies on production equipment. - **Maintenance & repair (MRO):** a stocked size for servicing existing plant where the original fastener spec must be matched. - **Fabrication & metalwork:** bench and on-site assembly of steel frames, enclosures and weldments. Product catalog ## Related Screwdriver Bits products [![Stainless Steel Structural Rivet (Special) – A2&A4 Grade](https://img.engineeringhardware.com/Stainless-Steel-Structural-Rivet-Special-A2-A4-Grade.webp)](https://engineeringhardware.com/product/stainless-steel-structural-rivet-special-a2-a4-grade/) Drive, Structural & Specialty Rivets ### [Stainless Steel Structural Rivet (Special) – A2&A4 Grade](https://engineeringhardware.com/product/stainless-steel-structural-rivet-special-a2-a4-grade/) Aluminum&Steel · ISO9001 **US$0.0036 – 0.12**MOQ 1,000 pieces [![OEM 1/4 1/2 3/8 Aluminum Steel Stainless Steel Drive Pin Rivets Speed Pin Rivet Hammer Drive Rivets](https://img.engineeringhardware.com/OEM-1-4-1-2-3-8-Aluminum-Steel-Stainless-Steel-Drive-Pin-Rivets-Speed-Pin-Rivet-Hammer-Drive-Rivets.webp)](https://engineeringhardware.com/product/oem-1-4-1-2-3-8-aluminum-steel-stainless-steel-drive-pin-rivets-speed-pin-rivet/) Drive, Structural & Specialty Rivets ### [OEM 1/4 1/2 3/8 Aluminum Steel Stainless Steel Drive Pin Rivets Speed Pin Rivet Hammer Drive Rivets](https://engineeringhardware.com/product/oem-1-4-1-2-3-8-aluminum-steel-stainless-steel-drive-pin-rivets-speed-pin-rivet/) DIN · Steel **US$0.012 – 0.024**MOQ 5,000 pieces [![Expansion Fastener Round Head Aluminum Inox Hammer Drive Rivets](https://img.engineeringhardware.com/Expansion-Fastener-Round-Head-Aluminum-Inox-Hammer-Drive-Rivets.webp)](https://engineeringhardware.com/product/expansion-fastener-round-head-aluminum-inox-hammer-drive-rivets/) Drive, Structural & Specialty Rivets ### [Expansion Fastener Round Head Aluminum Inox Hammer Drive Rivets](https://engineeringhardware.com/product/expansion-fastener-round-head-aluminum-inox-hammer-drive-rivets/) Aluminum/Stainless Steel · Eco-Friendly **US$0.024 – 0.036**MOQ 50,000 pieces [![Premium Multi-Grip Stainless Steel Rivets for Versatile Applications](https://img.engineeringhardware.com/Premium-Multi-Grip-Stainless-Steel-Rivets-for-Versatile-Applications.webp)](https://engineeringhardware.com/product/premium-multi-grip-stainless-steel-rivets-for-versatile-applications/) Drive, Structural & Specialty Rivets ### [Premium Multi-Grip Stainless Steel Rivets for Versatile Applications](https://engineeringhardware.com/product/premium-multi-grip-stainless-steel-rivets-for-versatile-applications/) Round Head · DIN, GB, ANSI, BSW, JIS, GOST **US$0.012**MOQ 100 pieces [![304& 316 Natural Polish Precision Durable Reliable Structural Rivet](https://img.engineeringhardware.com/304-316-Natural-Polish-Precision-Durable-Reliable-Structural-Rivet.webp)](https://engineeringhardware.com/product/304-316-natural-polish-precision-durable-reliable-structural-rivet/) Drive, Structural & Specialty Rivets ### [304& 316 Natural Polish Precision Durable Reliable Structural Rivet](https://engineeringhardware.com/product/304-316-natural-polish-precision-durable-reliable-structural-rivet/) Steel · Natural Polish **US$0.024 – 0.06**MOQ 1,000 pieces [![Copper Multi-Grip Corrosion-Resistant Rivets for Sporting Equipment](https://img.engineeringhardware.com/Copper-Multi-Grip-Corrosion-Resistant-Rivets-for-Sporting-Equipment.webp)](https://engineeringhardware.com/product/copper-multi-grip-corrosion-resistant-rivets-for-sporting-equipment/) Drive, Structural & Specialty Rivets ### [Copper Multi-Grip Corrosion-Resistant Rivets for Sporting Equipment](https://engineeringhardware.com/product/copper-multi-grip-corrosion-resistant-rivets-for-sporting-equipment/) Round Head · DIN, GB, ANSI, JIS **US$0.11**MOQ 5,000 pieces [View all Drive, Structural & Specialty Rivets →](https://engineeringhardware.com/fastener-products/rivets-eyelets/drive-structural-specialty-rivets/) [Full product catalog](https://engineeringhardware.com/products/) ## How to Specify Cross-Recess Screwdriver Bits (PH / PZ) for Your Application - **Size:** Select on size designation, and confirm it against the mating feature in the assembly. This product spans 1–3; check the full table below for the exact dimensions of each size. - **Material:** Choose the material and finish for the service environment — plated steel for general use, stainless for corrosion resistance. - **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 DIN 3126 / ISO 1173 (C6.3 hexagon drive). Quoting the standard on your order guarantees interchangeable dimensions between suppliers. ## Where Cross-Recess Screwdriver Bits (PH / PZ) Are Not the Right Choice Match the fastener to the load, environment and whether the joint must be reopened; the wrong class or style is the usual cause of joint failure. Custom manufacturing · Made to drawing ## Need a cross-recess screwdriver bits (ph / pz) outside the standard range? A non-standard fastener tool is quoted from the drawing; where one already exists in the catalog, the special is usually a variation on its tooling. Minimum order from 2,000 pieces; samples within 7 days of drawing approval. [Custom fastener tool manufacturing](https://engineeringhardware.com/custom/tools/)[Send a drawing](https://engineeringhardware.com/custom/tools/#rfq) ## Technical Drawing Dimensioned line drawing of PH0 Cross-Recess Screwdriver Bits (PH / PZ) to DIN 3126 / ISO 1173 (C6.3 hexagon drive). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected. - **Recess:** Phillips - **Typical screw size:** M2 – M2.5 - **Distinguishing mark on the screw:** plain cross, tapered flanks ## Dimensions & Specifications (DIN 3126 / ISO 1173 (C6.3 hexagon drive)) | Bit | Recess | Typical screw size | Distinguishing mark on the screw | | --- | --- | --- | --- | | PH0 | Phillips | M2 – M2.5 | plain cross, tapered flanks | | PH1 | Phillips | M3 – M3.5 | plain cross, tapered flanks | | PH2 | Phillips | M4 – M5 | plain cross, tapered flanks | | PH3 | Phillips | M6 – M8 | plain cross, tapered flanks | | PZ1 | Pozidriv | M3 – M3.5 | cross plus four fine radial ticks | | PZ2 | Pozidriv | M4 – M5 | cross plus four fine radial ticks | | PZ3 | Pozidriv | M6 – M8 | cross plus four fine radial ticks | 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 are Cross-Recess Screwdriver Bits (PH / PZ) used for? Installing, adjusting or servicing the assembly rather than forming part of it. They are supplied to DIN 3126 / ISO 1173 (C6.3 hexagon drive). ### Which industries use Cross-Recess Screwdriver Bits (PH / PZ)? They are commonly specified in general machine building, maintenance & repair (mro) and fabrication & metalwork, among other sectors. ### How do I choose the right size of Cross-Recess Screwdriver Bits (PH / PZ)? Select on size designation and on the fit the assembly requires. This product is available from 1 to 3; the full dimension table on this page lists each size. ### Are Cross-Recess Screwdriver Bits (PH / PZ) made to a recognized standard? Yes — they are manufactured to DIN 3126 / ISO 1173 (C6.3 hexagon drive), so dimensions are interchangeable between suppliers when you quote the standard on your order. ### Can I get a quote for Cross-Recess Screwdriver Bits (PH / PZ) 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: [Cross-Recess Screwdriver Bits (PH / PZ) — specifications & sizes](https://engineeringhardware.com/fastener/cross-recess-screwdriver-bits/) ### Cross-Recess Screwdriver Bits (PH / PZ) Specification Guides ### Related Fastener Applications