M4–M10 & 1/4"-5/16" Spade-Head Thumb Screws – A2 304 Stainless Steel, Tool-less Hand Grip

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M4–M10 & 1/4"-5/16" Spade-Head Thumb Screws – A2 304 Stainless Steel, Tool-less Hand Grip

HomeDIYer

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By HomeDIYer®

Size: M4 x 8mm

Pack Quantity: 10 Pcs

Price:

$4.20 USD

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In stock (500 units), ready to be shipped

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Spade-Head Thumb Screws — A2 304 Stainless Steel for Tool-Free Fastening

Struggling with fasteners that require a screwdriver every time you need to open an access panel or adjust a fixture? These spade-head thumb screws are built for engineers, makers, and DIY enthusiasts who need fast, repeated hand-tightening without reaching for tools. The wide, flat racket-style head gives your fingers a natural grip surface, letting you apply real torque by hand — ideal for machine guards, electrical enclosures, camera rigs, and 3D printer frames.

Each screw is machined from A2 grade 304 stainless steel, delivering solid corrosion resistance and mechanical strength. The spade head sits above a fully threaded shank. Metric sizes span M4 through M10 with lengths from 8 mm (0.31 in) to 40 mm (1.57 in); imperial UNC sizes cover 1/4"-20 and 5/16"-18 with lengths from 10 mm (0.39 in) to 25 mm (0.98 in). Thread length is measured from the underside of the head to the tip — the head itself is not included in the stated length.

Typical use cases include tool-free thumb screw fastening on CNC machine covers, quick-release photography equipment mounts, adjustable furniture and shelving brackets, and frequent-access electronic enclosure panels — all scenarios where spade-head stainless thumb screws save time on every cycle.

⚙️ Compatibility: Metric sizes use standard coarse pitch (M4×0.7, M5×0.8, M6×1.0, M8×1.25, M10×1.5). Imperial sizes are UNC thread (1/4"-20, 5/16"-18). Fits standard hex nuts, nyloc nuts, and tapped holes of the same thread specification.

✅ Key Features of These Spade-Head Thumb Screws

🖐️ Wide Spade / Racket Head

The broad, flat head with rounded ends distributes finger pressure evenly, allowing continuous rotation without repositioning — faster than wing screws in tight spaces.

🛡️ A2 304 Stainless Steel

Resists rust, oxidation, and mild chemical exposure. Suitable for indoor machinery, outdoor equipment, and humid workshop environments without surface treatment.

🔩 Fully Threaded Shank

Threads run the entire length of the shank from just below the head to the tip, maximising thread engagement in shallow tapped holes and thin materials.

📐 Metric & Imperial Sizes

Available in M4, M5, M6, M8, M10 (metric coarse) and 1/4"-20 UNC, 5/16"-18 UNC — covering the most common fastener standards used in engineering and DIY.

📦 Flexible Pack Quantities

Choose from 1, 2, 4, 5, 10, 20, 25, or 50 pieces per order to match your project scale — from single prototypes to production-run restocking.

🔧 Tool-Free Operation

No screwdriver or wrench required. Designed for repeated manual adjustment cycles on panels, guards, and fixtures where speed of access matters.

📐 Technical Specifications — Spade-Head Thumb Screws

Product Type	Spade-Head (Racket-Head) Thumb Screw
Material	A2 Stainless Steel (304 / 18-8)
Head Style	Spade / Racket — wide flat head with rounded ends
Drive Style	Hand grip — tool-free
Thread Form	Metric coarse (M4–M10) / UNC (1/4"-20, 5/16"-18)
Thread Type	Fully threaded shank
Length Measurement	Under head (bearing face to tip; head not included)
Metric Size Range	M4 × 8–20 mm · M5 × 10–25 mm · M6 × 10–40 mm · M8 × 16–40 mm · M10 × 20–40 mm
Imperial Size Range	1/4" × 10–25 mm · 5/16" × 16–25 mm
Finish	Natural stainless (unplated, mill finish)
Pack Quantity	See variant options
Weight per Unit	See variant options

❓ Frequently Asked Questions

What is a spade-head thumb screw and how does it differ from a wing screw or knurled thumb screw?

A spade-head (also called racket-head) thumb screw has a wide, flat head shaped like a small tennis racket. This gives your fingers a large contact surface for comfortable, continuous rotation without repositioning. Wing screws have two protruding wings that can snag on surrounding parts; knurled thumb screws have a cylindrical knurled head that offers less leverage. The spade head is the best balance of grip area and compact profile for frequent-access applications.

How is the thread length measured — does it include the head?

No. Length is measured from the underside of the head (the flat bearing surface that contacts the workpiece) to the tip of the shank. The spade head itself is not counted. For example, an M6 × 20 mm screw has exactly 20 mm of threaded shank below the head.

Will A2 304 stainless steel rust outdoors or in humid environments?

A2 (304) stainless steel resists rust and oxidation in most outdoor and humid conditions, including rain exposure and workshop environments. It is not recommended for continuous saltwater immersion or aggressive coastal spray — for those applications, A4 (316) stainless is the better choice. For general outdoor machinery, garden equipment, and indoor/outdoor DIY projects, 304 grade performs reliably for years.

Can I use these with standard hex nuts, or are they only for tapped holes?

Both. The fully threaded shank works in pre-tapped holes of the matching thread size, or with standard hex nuts, nyloc nuts, or flange nuts for through-hole applications. For best corrosion performance, pair with stainless steel nuts of the same grade.

What is the difference between M4 metric and 1/4" UNC imperial threads — are they interchangeable?

They are not interchangeable. M4 is a metric thread with a 4 mm nominal diameter and 0.7 mm pitch. 1/4"-20 UNC is an imperial thread with approximately 6.35 mm diameter and 20 threads per inch. Forcing one into a hole tapped for the other will strip the threads. Always match the thread standard to your existing hardware or tapped hole.

How do I choose the right thread length for my application?

As a general rule, aim for a thread engagement length of at least 1× the screw diameter in steel, or 1.5–2× in aluminium or plastic. For example, an M6 screw should engage at least 6 mm of thread in a steel tapped hole. If you are clamping material between the head and a nut, add the material thickness to the required engagement length to determine the minimum shank length needed.

Which pack quantity should I order for a production or maintenance application?

For prototyping or single-unit repairs, the 1–5 piece packs are cost-effective. For production runs, maintenance kits, or stocking a workshop, the 10, 20, 25, or 50 piece packs offer a lower per-unit cost. Select your size and pack quantity from the variant dropdowns above.

🛒 Select your Size and Pack Quantity above, then add to cart.