TX24 5-Lobe Pin TX Countersunk Security Machine Screws
Countersunk head 5-lobe pin TX security machine screws, M3–M8 as tabulated: head diameters 5.7–16.8 mm, head heights 1.7–4.4 mm. Material-coded availability matrix from 6 mm to 40 mm; A2 and A4-70 stainless steel, zinc-plated steel to order.
Last updated: 2026-11
Specifications
TX24 is the flush machine-thread member of the 5-lobe line: a countersunk head that disappears into a 90° seat, leaving only the five-lobed, centre-pinned recess visible — the collected page describes the 5-lobe geometry as reminiscent of a flower petal, more secure than the common 6-lobe pin TX because the design is less readily available. The collected tabulation runs M3 to M8 with head diameters 5.7–16.8 mm and head heights 1.7–4.4 mm; as on TX09, the M3 row lists no tool size, so no M3 tool claim is made here. Supply is stated in A2 and A4-70 stainless steel with steel zinc plated available to order, and the page notes the button-head 5-lobe pin TX screws (TX09) as the proud-head alternative on the same drive. The availability matrix is material-coded cell by cell across 6–40 mm: M4–M6 mark broadly (M5/M6 continuously from 6 to 40 mm), M3 marks only at 6, 10 and 12 mm, and M8 enters from 16 mm upward — the machine-thread route to a flush 5-lobe fixing on tapped holes and nuts, from instrument panels to public-facing joinery.
| Designation | TX24 — countersunk head security machine screw, 5-lobe pin TX drive; seats flush in a 90° countersink, matched restricted insert bit (button-head alternative: TX09) |
|---|---|
| Thread range (tabulated) | M3, M4, M5, M6, M8 |
| Head diameter dk per thread (mm) | M3 5.7 · M4 7.8 · M5 7.8 · M6 11.8 · M8 16.8 |
| Head height k per thread (mm) | M3 1.7 · M4 2.3 · M5 2.8 · M6 3.3 · M8 4.4 |
| Tool size (collected) | No.1 (M4) · No.2 (M5, M6) · No.2.5 (M8); no tool size listed for M3 |
| Length availability (as marked) | M3 6, 10, 12 · M4 6–25 · M5/M6 6–40 continuous · M8 16–40; unmarked pairs confirmed at quotation — Availability matrix legend (as collected): stainless-triangle marker = A2 stainless steel; black-triangle marker = A4-70 stainless steel |
| Security principle | Reusable two-way fixing; more secure than 6-lobe pin TX as the design is less readily available; higher-torque capable per the collected page |
Materials
- A2 stainless steel
- A4-70 stainless steel
- Steel, zinc plated (to order)
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 (TX24 5-Lobe Pin TX 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
TX24 or TX09 — flush or button on a machine-thread joint?
The joint face answers it. TX24 needs a countersunk mating surface and rewards it with a completely flush, anonymous finish — the specification-friendly choice on access panels and public joinery. TX09 sits proud on a plain hole, tolerates thin or unprepared faces, and its button dome carries a broader bearing. Both run the same 5-lobe pin drive and the same restricted bits, and both cover M3–M8; the collected matrixes differ mainly at the extremes — TX09 reaches 100 mm on M8 in A4-70, TX24 tops out at 40 mm.
Why does the M5 row show the same 7.8 mm head diameter as M4?
Because that is what the collected table prints: dk 7.8 on both M4 and M5, then a step to 11.8 mm at M6. It is an unusual progression in the family — most countersunk lines grow head diameter with every gauge — but this page renders the source verbatim rather than smoothing it. If your detail depends on the M5 head diameter, confirm it at quotation before cutting countersinks.
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; unmarked matrix pairs, zinc-plated steel on request, and specials made to order 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 and head style, the drive (5-lobe pin TX or 7-lobe pin — matched restricted insert bits required), thread or tapping size and length, the material marker you expect (A2 or A4-70 stainless; zinc-plated steel on request), the substrate or mating part, required certificates, and quantity per size — plus destination country. If you are matching existing fixings, name the drive generation explicitly: 5-lobe, 6-lobe and 7-lobe pin bits are not interchangeable.
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