Set Screw Image: Identify Key Details | Hebei Wotu Fastener Manufacturing Co., Ltd.
A set screw image is usually needed to confirm a small but important detail: point style, drive type, thread form, or overall length before a buyer sends an inquiry or approves a drawing.
For fastening applications where the screw sits inside a hub, collar, knob, pulley, or shaft-mounted part, the image should make the contact end and socket clearly visible. Those features decide how the screw grips, how it is installed, and whether it may mark the mating surface.
Brand: Hengzuan Specifications: in stock 3.5/3.9/4.2 mainstream wire diameter, rod length 16mm~80mm full range of specifications in stock, supports nonstandard length customization Packaging: 25kg export cartons, full pallets wrapped with film, supports neutral export packaging, private-label customization
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Brand: Hengzuan Surface: blue and white zinc plated Specifications: in stock ST4.2/ST4.8full range of specifications, length 13~50mm in stock, support nonstandard length customization Packaging: 25kg cartons, solid wood packaging, support neutral packaging, private-label customization
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Brand: Hengzuan Surface: color zinc plated, can be customizedblue-white zinc plated Specifications: in stock 4.8/5.5 common wire diameter, rod length 16~125mm full range of specifications, supports nonstandard customized Packaging: 25kg cartons, whole wooden pallets, support neutral packaging, private-label customization
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Brand: Hengzuan Surface: Color zinc plated, optional blue-white zinc plated, black oxide treatment Specifications: Chinese national standard ST4.2/ST4.8/ST5.5 specifications, rod length 13~50mm in stock, supports nonstandard length customization Packaging: 25kg export cartons, full wooden pallets wrapped with film, supports neutral packaging, private-label customization
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Brand: Hengzuan Surface: blue and white zinc plated, can be customized color zinc plated, black oxide plated Specifications: Comply with GB/T15856.2-2002 Chinese national standard, in stock ST4.2/ST4.8/ST5.5 full range of specifications, length 13mm~75mm optional, supports customized nonstandard rod lengths; drilling adaptation plate thickness 0.7~6mm Packaging: 25kg export cartons, full pallets wrapped with film, supports neutral export packaging, customer private-label customization
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Brand: Hengzuan Surface: screw color zinc plated + hex head outdoor paint Specifications: ST5.5, ST6.3, rod length 25mm～120mm in stock, supports nonstandard customization, suitable for drilling steel sheets 2～5mm Packaging: 25kg cartons, whole wooden pallets
Read MoreSet screw identification
When comparing set screw options, focus on point geometry, socket or drive form, thread size, length definition, material, coating, and the part the screw will contact. A clear set screw image is helpful for identification, but the final selection should be tied to a drawing, standard, or confirmed sample.
| Criterion | What To Check | Why It Matters | Buyer Tip |
|---|---|---|---|
| Point style visible in the image | Look at the end of the screw and confirm whether it is flat, cup, cone, dog, or another point form. | The point is the part that contacts the shaft or mating part, so it changes holding method, surface marking, and alignment behavior. | Ask: can you confirm the point style shown in the image and whether it matches the drawing or sample? |
| Drive recess shown on the headless body | Check whether the socket is hex, slotted, square, or another drive type, and confirm it is clearly visible in the image. | The drive type affects installation tool choice, torque control, and how easily the screw can be removed later. | Ask: what drive type is required for our assembly tool, and can you provide a close-up image of the recess? |
| Thread coverage and end-to-end shape | Verify whether the screw is fully threaded and whether both ends in the image match the expected form. | Most set screws rely on full thread engagement, and a wrong end shape can change how the screw seats or locks a component. | Ask: is the part fully threaded over the entire length, and does the photo show the actual production style? |
| Size reference in the photo | Look for a scale, caliper, drawing, or labelled dimensions beside the set screw image. | A photo alone can make short set screws and different diameters look similar, which may lead to ordering the wrong size. | Ask: can you provide the diameter, thread pitch, overall length, and a dimensioned drawing with the image? |
| Surface finish and material appearance | Check the color and finish in the image, but do not rely on appearance alone to identify material or coating. | Black oxide, zinc plating, stainless steel, and other finishes can look similar under different lighting, yet perform differently in service. | Ask: what material and surface treatment does the photographed set screw have, and can this be stated on the quotation? |
The most useful distinction in a set screw photo is the point. A cup point bites into a shaft and gives strong holding force, while a flat point spreads contact and is gentler on the surface. Cone, dog, and oval points suit different locating, locking, or adjustment needs. A photo that hides the tip can lead to the wrong part even if the diameter and length look correct.
Drive style also matters. Hex socket set screws are common because they allow installation in recessed positions, but buyers should still confirm the socket type, thread size, material, surface finish, and applicable standard. An image supports identification; it should not replace a specification or drawing for procurement.
Start with the assembly, not only the screw appearance. A set screw used to lock a pulley on a rotating shaft has different priorities from one used as an adjustment stop or locating pin. Ask where the screw contacts the mating part, how often it may be removed, and whether marking the surface is acceptable.
Check the point style before confirming an order. Cup points are common for holding power, flat points reduce damage, cone points locate into a prepared recess, and dog points can act like a short pin. A frequent mistake is approving a set screw from a side-view image without seeing the working end.
Match the drive and thread to the installation method. Recessed assemblies often need a socket drive with enough tool access. Thread fit, length under the standard definition, and end shape should match the mating hole and engagement depth. If a set screw bottoms out too early or does not engage enough thread, the assembly can loosen even when the visible size appears right.
For an inquiry, send the image you are using, the required thread size, length, point type, drive type, material or finish requirement, and the application surface it will press against. If you do not have a drawing, a clear photo from the side and from the point end will help the supplier identify the correct style before quoting.
| Criteria | Importance | Description | Example Options |
|---|---|---|---|
| Point style | Usually the first detail to confirm | The point decides how the set screw contacts the mating part. It affects holding force, surface marking, locating accuracy, and whether the screw can be adjusted or removed cleanly. | A cup point may suit a shaft-locking application, while a flat point may be preferred where surface damage must be reduced. |
| Drive type and tool access | Important when the screw sits inside a recessed part | The drive must match the installation tool and allow enough access for tightening. A clear image should show the socket or slot, but the required drive size should still be confirmed separately. | A hex socket style can be practical for a collar or pulley where the screw sits below the outer surface. |
| Thread size and length | Critical for fit and thread engagement | Visual comparison can be misleading because small differences in diameter, pitch, and length may not show clearly in a photo. Confirm the thread specification and how length is measured for the selected standard or drawing. | Two set screws may appear similar in a side photo but have different thread pitch or different effective engagement in the tapped hole. |
| Material and finish | Depends on environment, strength needs, and mating material | An image may show color or coating, but it cannot reliably prove material grade, hardness, corrosion resistance, or finish specification. These details should be stated in the inquiry rather than inferred from appearance. | A dark surface may suggest a black finish, but the buyer should still specify the required material and coating. |
| Application contact surface | Changes the preferred set screw style | The same-looking screw can behave differently depending on whether it presses against a hardened shaft, a soft metal part, a prepared recess, or an adjustment surface. Selection should start from the contact condition, not only the photo. | A cone point may locate into a prepared recess, while a flat point may be chosen for broader contact on a finished surface. |
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A photo can narrow the choice, especially if it shows the point and drive clearly. It should still be checked against thread size, length, material, finish, and any applicable drawing or standard before ordering.
The point-end view is often the most important because the tip determines how the screw contacts the shaft or mating part. A side view helps confirm length and general shape, but it may hide the difference between cup, flat, cone, dog, and oval points.
Cup points are often chosen for strong grip because the rim can bite into the surface. They are not always suitable where shaft marking is unacceptable, where the screw must be adjusted repeatedly, or where the mating part needs a smoother contact surface.
Buyers sometimes assume that two screws with the same visible length and socket shape are interchangeable. The point style, thread pitch, length definition, material, and surface finish can all change fit and performance even when the screws look similar in a small photo.
Send the thread size, length, point type if known, drive type, material or finish requirement, and the application it will press against. If the point style is uncertain, include a clear close-up of the working end and a photo beside a ruler or confirmed sample.
Please share the set screw image, required thread size and length, and the point or drive style if known. Also note the mating part or application surface so the contact end can be checked properly.
