2H02 Two Hole Countersunk Security Machine Screws
Countersunk head two-hole security machine screws, M3–M6 as tabulated: head diameters 6.0–12.4 mm, head heights 1.75–3.45 mm, driven by a two-pin insert bit. Marked metric lengths run 6–50 mm across M3/M4/M5/M6 (M3.5 in 10–30 mm and 50 mm); A2 and A4 stainless steel, with the imperial matrix also marking brass on several size pairs.
Last updated: 2026-11
Specifications
The countersunk member of the two-hole line buries the drive flush: the 90° conical head seats into a standard countersink leaving only the twin holes visible, which is the neatest possible finish for a security screw and the reason this SKU appears on public-facing woodwork and panelling where a proud head would catch or advertise. The collected tabulation runs M3 to M6 with head diameters 6.0–12.4 mm and head heights 1.75–3.45 mm, plus an electrical-trade M3.5 size, and states supply in A2 and A4 stainless steel. The metric availability matrix marks 6–50 mm continuously on M3, M4, M5 and M6, with M3.5 marked at 10–30 mm and 50 mm. The imperial matrix is the detail that matters for mixed hardware: its legend makes the markers material-coded — the plain triangle means stainless, the plain plus yellow triangle means that size pair is available in stainless and in brass — so on size pairs up to 3/8-16 × 4″ the source is explicitly offering a brass option where appearance or non-magnetic behaviour governs. Unmarked pairs are quotation items. Drive behaviour is the family standard: reusable two-way with the two-pin insert bit, low to medium torque, more cam-out than a pin-hex, and hole centre distances that vary between makers — buy screws and bits together.
| Designation | 2H02 — countersunk head security machine screw, two-hole drive; seats flush in a 90° countersink, twin holes take a two-pin insert bit |
|---|---|
| Thread range (tabulated) | M3, M3.5, M4, M5, M6 |
| Head diameter dk per thread (mm) | M3 6.0 · M3.5 6.6 · M4 8.4 · M5 10.4 · M6 12.4 |
| Head height k per thread (mm) | M3 1.75 · M3.5 1.9 · M4 2.4 · M5 2.95 · M6 3.45 |
| Tool size (collected) | No.4 · No.6 · No.8 · No.10 · No.14 two-pin insert bits by thread |
| Length availability (as marked, metric) | M3/M4/M5/M6 6–50 mm continuously; M3.5 at 10, 12, 16, 20, 25, 30 and 50 mm; unmarked pairs confirmed at quotation |
| Length availability (as marked, imperial) | UNC/UNF matrix No.4-40 to 3/8-16 × 3/16″–4″, marked cell by cell; legend: plain marker = stainless steel, plain + yellow marker = stainless and brass |
| Security principle | Reusable two-way fixing, medium security resistance at low cost; low to medium torque; cam-out and bit wear as per the two-hole family |
Materials
- A2 stainless steel
- A4 stainless steel
- Brass (imperial matrix, marked size pairs only)
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (2H02 Two Hole Countersunk Security Machine Screws) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
When does the brass option on the imperial sizes matter?
Where the fixing must be non-magnetic, softer than the mating metal, or visually warm — heritage ironmongery, instrument panels, switchgear on display. The collected matrix marks those size pairs with both the stainless and brass markers rather than listing brass as a separate table, so treat brass as an order-to-marked-pair option: state thread, length and material together on the RFQ, and any pair without the brass marker is a quotation line.
Can 2H02 be paired with security nuts for a stronger assembly?
Yes — the collected page names wave nuts, shear nuts, Kinmar reusable and permanent nuts, 4-hole nuts and pin-TX barrel nuts as compatible pairings when the assembly needs more than the countersunk head alone provides. That matters on through-joints where the nut side is as reachable as the head: a snake-eye head on a shear nut means neither end surrenders to ordinary tools, while both stay serviceable with the correct dedicated ones.
What is the MOQ and lead time for these security screws?
Minimum order quantity is 10,000 pieces per item. Stocked sizes ship in 3–7 days; sizes quoted as available to order, and non-standard sizes or materials, are quoted with a confirmed schedule. Confirm the exact schedule against quantity and size mix at quotation.
What should an RFQ for these security screws state?
State the designation code (2H01 through 2H14) and head style, the drive (two-hole pig nose / snake eye — fitted with a matching two-pin insert bit), thread or tapping size and length, the hole centre distance your existing bits expect (the source notes it varies between makers), material and finish, the substrate or mating part, required certificates, and quantity per size — plus destination country.
Related knowledge
- Thread-Forming vs Thread-Cutting vs Thread-Rolling Self-Tapping Screws: What the Evidence Settles on Base Material
- Screw Family Selection by Base Material: Wood, Machine and Self-Tapping Threads, Engagement and Coating
- Hex Bolts vs Socket Head Cap Screws: What the Evidence Settles on Strength, Clearance and Cost
Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support