2H01 Two Hole Pan Pig Nose Security Machine Screws
Pan head two-hole security machine screws, M2.5–M6 as tabulated: head diameters 6.0–12.0 mm, head heights 1.8–3.6 mm, driven by a two-pin insert bit (tool sizes No.4–No.14). Marked metric lengths run M2.5 6–16 mm, M3 6–12 mm, M4 6–50 mm, M5 8–60 mm, M6 10–60 mm; A2 and A4 stainless steel; imperial UNC/UNF matrix marked per cell from 1/4″ to 4″.
Last updated: 2026-11
Specifications
The two-hole drive — the source lists Snake Eye, Pig Nose, Two Pin and Spanner Drive as its industry aliases — is the aesthetics-first security screw: two holes drilled into a clean pan head accept a matching two-pin insert bit and nothing else, so the fixing looks like a smooth domestic fastener while resisting ordinary drivers. This 2H01 is the machine-thread baseline of the line, tabulated M2.5 to M6 with head diameters 6.0–12.0 mm and head heights 1.8–3.6 mm, and the collected page states supply in A2 and A4 stainless steel — the full corrosion-resistant pair, unusual in this family where most sibling SKUs standardise on A2 only. The drive is a reusable two-way fixing for low to medium torque joints meant to be reopened for maintenance by anyone holding the right bit; the source is candid about its limits — it cams out more readily than pin-hex drives, the bits bend or break under prolonged use, and because the hole centre distance varies between makers, screws and bits should be bought from the same supplier. The metric availability matrix is marked per cell: M2.5 from 6 to 16 mm, M3 from 6 to 12 mm, M4 from 6 to 50 mm, M5 from 8 to 60 mm, M6 from 10 to 60 mm, and a separate imperial matrix marks UNC/UNF size pairs from No.4-40 up to 1/4-28 in lengths 1/4″ to 4″ cell by cell — pairs inside those tables not carrying a marker are quotation items, not stocking assumptions.
| Designation | 2H01 — pan head security machine screw, two-hole drive (two holes drilled into the head; two-pin insert bit installs and removes; source aliases: Snake Eye, Pig Nose, Two Pin, Spanner Drive) |
|---|---|
| Thread range (tabulated) | M2.5, M3, M4, M5, M6 |
| Head diameter dk per thread (mm) | M2.5 6.0 · M3 6.6 · M4 8.0 · M5 10.0 · M6 12.0 |
| Head height k per thread (mm) | M2.5 1.8 · M3 1.9 · M4 2.4 · M5 3.0 · M6 3.6 |
| Tool size (collected) | No.4 · No.6 · No.8 · No.10 · No.14 two-pin insert bits by thread |
| Length availability (as marked, metric) | M2.5 6–16 mm · M3 6–12 mm · M4 6–50 mm · M5 8–60 mm · M6 10–60 mm; unmarked size/length pairs confirmed at quotation |
| Length availability (as marked, imperial) | UNC/UNF matrix No.4-40 to 1/4-28 UNF × 1/4″–4″, marked cell by cell (not a rectangular band — state the exact pair) |
| Security principle | Reusable two-way fixing, low/medium security resistance, low to medium torque; more prone to cam-out than pin-hex drives per the collected page |
| Drive servicing note (source-stated) | Hole centre distance varies between makers — purchase screws and matching bits from the same supplier; keep spare bits (prone to bending/breaking in prolonged use) |
Materials
- A2 stainless steel
- A4 stainless steel
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 (2H01 Two Hole Pan Pig Nose 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
Is a two-hole (snake eye) screw reusable — and how secure is it really?
It is genuinely two-way: the matching insert bit drives it in and out without damage, which is exactly why it suits panels and enclosures that get serviced. The security is deliberately moderate — the collected page classes it as low/medium resistance, mainly to keep the public face of the fixing free of visible drive recesses and to stop casual interference with ordinary tools. For permanent one-way fixings the clutch head line is the stronger match; for serviced panels with higher torque, pin-TX holds up better.
Why must the screws and the insert bits come from the same supplier?
Because the two holes can be drilled at different distances between centres — the collected page states this plainly. A bit pitched for one maker's head will not engage another's, and the mismatch shows up as a slipped bit at the worst moment. Quote the centre distance with the RFQ if you are matching an existing installation, and standardise screws and bits on one source going forward.
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