English
Our ISO 7380 Button Head Socket Screws (also known as Allen button head screws) are designed for assemblies requiring a low-profile rounded head and a neat exposed finish, covering ISO 7380-1 standard heads and ISO 7380-2 heads with a collar. The internal hex drive allows tightening with a hex key where clearance around the head is limited, while carbon, alloy and 304/316 stainless steel with black oxide, zinc or zinc flake finishes offer material and coating choices. These fasteners are ideal for equipment enclosures, sheet metal panels, mounting brackets and automation equipment, with M3-M16 sizes and custom lengths from drawings.
Haosheng Fasteners supplies ISO 7380 button head socket screws, also known as hex socket button head screws or Allen button head screws. A low-profile rounded head and an internal hexagonal drive make them suitable for equipment enclosures, sheet metal panels, mounting brackets, automation equipment and mechanical assemblies where a neat exposed finish and limited head clearance matter. The series has two designs: ISO 7380-1 for standard button head screws and ISO 7380-2 for screws with a collar, referred to as a flange in many catalogues. Both parts are specified as button head screws with reduced loadability due to head design, so head load should be checked separately in joint design.
Carbon steel, alloy steel and stainless steel options include 304 and 316 with corresponding A2/A4 groups. Metric sizes M3-M16 with product grade A dimensional accuracy are supplied fully threaded or as specified, with black oxide, blue zinc, yellow zinc, zinc-nickel and non-electrolytic zinc flake finishes selected for the operating environment; stainless steel products can be cleaned or passivated. Steel property classes follow the applicable standards and order requirements, while stainless steel classes follow ISO 3506-1. Special lengths, fine threads, specified materials and finishes are evaluated from customer drawings for distributors, equipment manufacturers and industrial procurement teams.
| Product Standards | ISO 7380-1 / ISO 7380-2 | Standard Versions | ISO 7380-1:2022 / ISO 7380-2:2022 |
|---|---|---|---|
| Head Design | Rounded Button Head | Drive Type | Internal Hexagon Socket |
| Product Grade | A (dimensional accuracy) | Common Sizes | M3-M16 |
| Material | Carbon / Alloy / Stainless Steel | Stainless Options | 304, 316 / A2-A4 Groups |
| Surface Finishes | Black Oxide / Blue Zinc / Yellow Zinc / Zinc-Nickel / Zinc Flake | Samples | Available upon request |
Technical note: ISO 7380-1 and ISO 7380-2 specify different head configurations, and ISO calls the Part 2 design a screw with a collar rather than a flange. Product Grade A refers to dimensional accuracy and tolerances, not a mechanical property class. Both parts cover button head screws with reduced loadability, so the head load is considered separately from the thread load in the joint design. Steel property classes follow the applicable standards and order requirements; stainless steel classes follow ISO 3506-1. Custom sizes, lengths, packaging and acceptance criteria are confirmed in the drawing and purchase order before production.
The smooth button head keeps projection low and leaves a neat exposed finish on equipment housings, protective covers and metal panels.
A matching hex key or bit tightens the screw along its axis, useful where clearance around the head is limited.
Carbon and alloy steel cover specified property classes, while 304 and 316 stainless serve corrosion-resistant applications.
M3-M16 covers common metric sizes; length selection considers component thickness, thread engagement and installation space.
Oxide, zinc, zinc-nickel and zinc flake finishes are chosen for thread fit and corrosion needs; electroplated high-strength steel needs hydrogen embrittlement controls.
Special lengths, fine threads, special head dimensions and sizes outside the standard range are confirmed by approved drawings.
 |  |
 |  |
Carbon, alloy and stainless steel grades and inspection conditions are confirmed against dimensions and required mechanical properties before production.
Head diameter, head height and surface appearance are controlled against the applicable dimensional requirements of the specified part.
Socket width, depth and machining quality are checked so the matching hex key or bit seats and drives correctly.
External threads follow the specified diameter, pitch and tolerance, with thread quality and mating compatibility checked during production.
Finished-product inspection considers both thread load and head load, since ISO 7380 button heads have reduced head loadability.
Oxide, zinc, zinc-nickel and zinc flake coatings are applied against order requirements, with thread fit, coating quality and embrittlement risk in mind.
| Comparison Feature | Conventional Hex Head Bolts | Haosheng ISO 7380 Screws |
|---|---|---|
| Head Profile | Raised hex head, higher projection | Low rounded head, neat exposed finish |
| Tool Access | Wrench clearance needed around head | Hex key driven along the screw axis |
| Head Loadability | Full head load per thread size | Reduced head loadability per ISO 7380 |
| Material and Finish Range | Usually one steel grade and finish | Carbon, alloy, 304/316 with oxide or zinc finishes |
| Customization | Standard catalogue sizes | Special lengths, fine threads and finishes from drawings |
Selection note: ISO 7380-1 covers standard button head screws in steel and stainless steel, while ISO 7380-2 covers steel screws with a collar. Both are specified as button head screws with reduced loadability, with head load assumed at 80 percent of the thread load; the property class marking is preceded by a zero. Product Grade A is a dimensional tolerance grade, not a strength class. Confirm the full standard designation, head load, material, property class and finish against the actual assembly design before ordering.
Part 1 covers standard hexagon socket button head screws in steel and stainless steel; Part 2 covers steel screws with a collar, often called a flange. Both are 2022 editions, M3-M16, product grade A. State the full designation when ordering.
No. The ISO 7380 series is specified as button head screws with reduced loadability. Head load is assumed at 80 percent of thread load, and the property class marking is preceded by a zero. Check both thread and head loads in the joint design.
No. Grade A refers to dimensional accuracy and tolerances. Steel property classes follow the applicable standards and order requirements; stainless steel classes follow ISO 3506-1.
Carbon steel, alloy steel and 304/316 stainless steel with A2/A4 groups. Finishes include black oxide, blue and yellow zinc, zinc-nickel and zinc flake; stainless parts can be cleaned or passivated. Hydrogen embrittlement controls apply to electroplated high-strength steel.
Metric M3-M16, with M3, M4, M5, M6, M8, M10 and M12 common. Use a matching hex key or hex bit, and select length by component thickness, required thread engagement and available installation space.
ISO 9001, ISO 14001 and ISO 45001 certified production, with thread, dimensional and surface finish inspection records against the agreed specification. Samples are available on request.
Please include the full standard designation (ISO 7380-1 or ISO 7380-2), thread size, length, material, property class, surface finish and order quantity.
Contact Us
Hit enter to search or ESC to close
If you are interested in our products, you can choose to leave your information here, and we will be in touch with you shortly.
