Hex Head Cap Screws
Fully threaded hex head screws for tapped holes and through-bolted joints.
Materials: stainless, carbon, alloy steel and more, subject to enquiry
ASME B18.2.1
View ProductCountersunk Screws
Flat-head screws that seat flush with the surface in countersunk holes.
Product Overview
Flat-head screws that seat flush with the surface in countersunk holes.
A screw is an externally threaded fastener normally driven into a tapped hole or nut, or forming its own thread in the mating material. Head style and drive are selected for the available access, flushness and torque requirement.
- Range of drives: hex, hex socket, slotted, Phillips, Torx
- Compact head profiles for tight assemblies
- Suitable for tapped holes and thin sections
Technical Specifications
| Product Name | Countersunk Screws |
| Product Type | Screws |
| Material | Stainless steel, carbon steel, alloy steel, duplex, super duplex, nickel alloys, brass, titanium, high tensile (subject to enquiry) |
| Grade | 304, 316, 8.8, 10.9, 12.9, A2-70, A4-70, A4-80, Grade 8 |
| Size Range | Available as per customer specification |
| Head / Drive | Flat countersunk head |
| Thread Type | Metric (ISO 261, 6g), UNC/UNF (ASME B1.1), or tapping screw threads (ASME B18.6.4 / DIN 7970) |
| Manufacturing / Dimensional Standard | DIN 7991, ISO 10642, DIN 963, ISO 2009, ASME B18.3 (applicable standard confirmed against your order) |
| Finish / Coating | Plain, zinc plated, hot dip galvanized, black oxide, passivated, electro galvanized, nickel plated, or customer specified |
| Mechanical Properties | Per material grade and standard; see table below |
| Testing / Inspection | Dimensional, visual, thread, mechanical and chemical checks as agreed with the order |
| Certification | Material Test Certificate on request; EN 10204 3.1 where requested |
Standards
Standards commonly associated with Countersunk Screws: DIN 7991, ISO 10642, DIN 963, ISO 2009, ASME B18.3. The governing standard is confirmed against your purchase specification; not every standard is stocked or supplied in every size or grade.
Dimensions
Dimensions are manufactured according to the applicable dimensional standard and customer requirements. Share your drawing or size list for confirmation.
Materials and Grades
| Material | Typical grades | Standards |
|---|---|---|
| Stainless Steel | 304, 304L, 316, 316L, 321 | ASTM F593, F594, A193 B8/B8M/B6, A194 Gr 8/8M, A276, ISO 3506-1/-2 |
| Carbon Steel | Class 4.6, ASTM A307 Gr A / B, Class 8.8 / SAE Gr 5 | ASTM A307, A563, ISO 898-1/-2, SAE J429, DIN/ISO dimensional standards |
| Alloy Steel | B7, B16, L7, 4340, A354 BD | ASTM A193 B7/B7M/B16, A194 2H/4, A320 L7, A354 BD, A574, ISO 898-1 10.9/12.9 |
| Duplex Steel | S31803 / S32205, S32304 | ASTM A276, A479, A182 F51/F60, NACE MR0175 / ISO 15156 where specified |
| Super Duplex Steel | S32750, S32760, S32550 | ASTM A276, A479, A182 F53/F55, NACE MR0175 / ISO 15156 where specified |
| Nickel Alloys | Alloy 600 (N06600), Alloy 625 (N06625), Alloy 718 (N07718), Alloy 825 (N08825), Monel 400 (N04400) | ASTM B166, B446, B637, B425, B164, B865, B574, F467/F468 |
| Brass | C26000, C28000, C36000, C46400 | ASTM B16, B21, B134, F467/F468, DIN/ISO dimensional standards |
| Titanium | Grade 1, Grade 2, Grade 5, Grade 9, Grade 12 | ASTM B348, B381, F467/F468, ASME SB-348 |
| High Tensile | Class 8.8, Class 10.9, Class 12.9, SAE Gr 5 / Gr 8 | ISO 898-1/-2, ASTM A193 B7, A354 BD, A325, A490, SAE J429 Gr 5/8 |
General industry information. Availability of a given grade is confirmed at enquiry stage. See individual material pages.
Mechanical Properties
| Property class / grade | Tensile (MPa) | Yield / proof (MPa) | Hardness |
|---|---|---|---|
| ISO 898-1 Class 8.8 (≤M16) | 800 min | 640 min | 22–32 HRC |
| ISO 898-1 Class 10.9 | 1040 min | 940 min | 32–39 HRC |
| ISO 898-1 Class 12.9 | 1220 min | 1100 min | 39–44 HRC |
| ASTM A574 (≤½ in) | 1240 min | – | 39–45 HRC |
| ISO 3506-1 A2-70 / A4-70 | 700 min | 450 min | – |
| ISO 3506-1 A4-80 | 800 min | 600 min | – |
Minimum or typical values per cited standards; they vary by grade, diameter, heat treatment and applicable standard.
Surface Finishes
| Finish | Notes |
|---|---|
| Plain | Uncoated; typical for stainless steel and non-ferrous |
| Zinc Plated / Electro Galvanized | Thin zinc layer for indoor and mild environments |
| Hot Dip Galvanized | Thick zinc coating for outdoor and structural use; allowances needed on mating threads |
| Black Oxide | Mild corrosion resistance with oil, low reflectivity |
| Passivated | Removes free iron from stainless steel to restore the passive film |
| Nickel Plated | Corrosion and wear resistance, appearance |
| Customer specified | Other coatings on request |
Manufacturing Process
Typical process route for this product type (general information; actual route depends on size, material and order):
- Raw material selection and verification
- Cutting to blank length
- Heading or forging
- Thread rolling or cutting
- Heat treatment where the grade requires it
- Surface treatment
- Inspection and testing
- Marking and packing
Inspection and Testing
- Dimensional inspection against drawing or standard
- Visual and surface inspection
- Thread inspection with go / no-go gauges
- Chemical composition verification and PMI where applicable
- Mechanical testing: tensile, proof load, hardness
- Coating thickness inspection where coated
- Material Test Certificate; EN 10204 3.1 where requested
See the Quality page. Documentation scope is agreed at the quotation stage.
Applications and Industries
MachineryIndustrial EquipmentAutomotiveFabrication
Packaging
- Cartons or wooden boxes on pallets, selected for weight and destination
- Seaworthy export packing, with corrosion protection where required
- Marking with grade, size and heat or batch number as per order
Customization
Countersunk Screws can be quoted to your drawing, sample or specification, including non-standard sizes, lengths, threads, materials and finishes. Send details through the enquiry form.
Frequently Asked Questions
What materials are available for Countersunk Screws?
Countersunk Screws can be quoted in stainless steel, carbon steel, alloy steel, duplex, super duplex, nickel alloys, brass, titanium and high tensile grades, subject to size and standard.
Which standards can be supplied?
Typical references are DIN 7991, ISO 10642, DIN 963, ISO 2009, ASME B18.3. The governing standard is confirmed against your specification.
What sizes are available?
Size range depends on product, material and standard. Share diameter, length and quantity for confirmation.
Can custom dimensions be manufactured?
Yes, to customer drawing or specification, subject to technical review.
What surface finishes are available?
Plain, zinc plated, hot dip galvanized, black oxide, passivated, electro galvanized, nickel plated or customer specified finishes.
Can material test certificates be supplied?
Material Test Certificates, including EN 10204 3.1 where requested, can be requested with the order. Scope is agreed at quotation.
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