ISO 299 Nuts for T-Slots
ISO 299 T-slot nuts M4 to M48 — the tongue-and-key machine-table nut that slides into the T-slot and clamps workholding down, with the collected a/e/f/h/k/d/F geometry ladder and per-1000 weight.
Last updated: 2026-11
Specifications
The T-slot nut is the workholding keystone of every machine table: a threaded block with a tongue (width a) that slides into the table's T-slot and a key cut (offset f, depth d) that stops it from turning when the stud is tightened. ISO 299 is the ISO designation for that nut; this catalog already carries the DIN 508 identity (the DIN counterpart), and this page is the ISO designation with its own collected column set — the source tabulates the slot-fit envelope here (F min. = the minimum T-slot width the nut fits, e = nut height) that the DIN page's capture carries as DIN 650 slot numbers instead. The collected ladder runs M4 to M48 with tongue width a in nominal/max./min. (5 mm nominal at M4 up to 54 at M48), nut height e nominal/min. (9/8,5 up to 85/84), key offset f (1 → 6), total height h (6,5 → 70), key height k nominal/min. (3/2,7 → 34/33), tongue depth d (5 → 54), slot width F min. (7 → 653 with a flagged plateau at the large end) and weight per 1000 pcs (2,5 kg → 2300 kg). Two verbatim print defects are flagged and not normalized: the M36 row prints e min. 54 against the ladder's max-minus-≈1 progression, and F min. repeats 653 unchanged across M36/M42/M48. Fit discipline: tongue width a must slide but not rock in the slot — the nominal/max./min. triple is the clearance envelope. Material and hardness (these nuts see stud torque and hammering) are not tabulated — per RFQ; case-hardened is the trade default, confirm at quotation.
| Standard | ISO 299 — nuts for T-slots (ISO designation; DIN 508 is the DIN counterpart identity) |
|---|---|
| Size range | M4 – M48, thirteen sizes in the collected ladder |
| Tongue | a: 5 → 54 mm (nominal/max./min. triple); offset f: 1 → 6; depth d: 5 → 54 |
| Nut height | e nominal 9 → 85 (min. 8,5 → 84; M36 min. cell flagged verbatim); total h: 6,5 → 70 |
| Key | k nominal 3 → 34 (min. 2,7 → 33) |
| Slot fit | F min. (minimum T-slot width): 7 → 653 — plateau 653 at M36/M42/M48 flagged verbatim |
| Weight | kg/1000 pcs: 2,5 (M4) → 2300 (M48) |
| Material / hardness | Not tabulated by the collected specification — per RFQ |
| Thread d | a nominal size | a max. | a min. | e nominal size max. | e min. | f | h | k nominal size max. | k min. | Weight kg/1000pcs | d | F min. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M4 | 5 | 4,7 | 4,5 | 9 | 8,5 | 1 | 6,5 | 3 | 2,7 | 2,5 | 5 | 7 |
| M5 | 6 | 5,7 | 5,5 | 10 | 9,5 | 1,6 | 8 | 4 | 3,5 | 4 | 6 | 11,4 |
| M6 | 8 | 7,7 | 7,5 | 13 | 12,5 | 1,6 | 10 | 6 | 5,5 | 10 | 8 | 16 |
| M8 | 10 | 9,7 | 9,5 | 15 | 14,5 | 1,6 | 12 | 6 | 5,5 | 18 | 10 | 29 |
| M10 | 12 | 11,7 | 11,4 | 18 | 17,5 | 2,5 | 14 | 7 | 6,5 | 24 | 12 | 46 |
| M12 | 14 | 13,7 | 13,4 | 22 | 21,5 | 2,5 | 16 | 8 | 7,5 | 35 | 14 | 67 |
| M16 | 18 | 17,7 | 17,4 | 28 | 27,5 | 2,5 | 20 | 10 | 9,5 | 75 | 18 | 128 |
| M20 | 22 | 21,7 | 21,4 | 35 | 34,5 | 2,5 | 28 | 14 | 13,5 | 165 | 22 | 196 |
| M24 | 28 | 27,7 | 27,4 | 44 | 43 | 4 | 36 | 18 | 17 | 345 | 28 | 282 |
| M30 | 36 | 35,6 | 35,3 | 54 | 53 | 6 | 44 | 22 | 21 | 770 | 36 | 448 |
| M36 | 42 | 41,6 | 41,3 | 65 | 54 | 6 | 52 | 26 | 25 | 1030 | 42 | 653 |
| M42 | 48 | 47,6 | 47,3 | 75 | 74 | 6 | 60 | 30 | 29 | 1550 | 48 | 653 |
| M48 | 54 | 53,6 | 53,2 | 85 | 84 | 6 | 70 | 34 | 33 | 2300 | 54 | 653 |
- Row 11 (M36): M36: e min. prints 54 against the ladder's max.-minus-1 progression (e nominal 65 → siblings print min. within ~1 of nominal, M30 65/53→M42 75/74); and F min. 653 at M36 repeats unchanged through M42 and M48. Carried verbatim, not normalized.
Materials
- Material and hardness specified per RFQ — T-slot nuts take stud torque and hammer seating, so the trade default is case-hardened or heat-treated steel; confirm hardness, finish and any stainless need at quotation, and state the table slot standard (the DIN 650-class widths) with the 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 (ISO 299 Nuts for T-Slots) 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
This page and the DIN 508 T-slot nut page in this catalog — which one do I order from?
Order by the designation your table and drawing call out — the fit dimensions govern, and the two captures tabulate different things. The DIN 508 page (x47 capture) carries the DIN column set: width across flats s, tongue offset f, height h, key k, and the "for T-slots according to DIN 650" slot mapping. This ISO 299 capture carries the ISO column set: the slot-fit envelope as F min. (minimum T-slot width), tongue width a in a nominal/max./min. triple, tongue depth d, and weight. Physically both are tongue-and-key threaded blocks over the same M4–M48 span, and where the columns overlap (f, h, k) the ladders sit within the same envelope — but this batch does not claim token identity between the two designations, and the ISO capture's large-end rows carry flagged print defects (e min. at M36, the 653 F plateau at M36–M48) you should confirm per RFQ if you are ordering the large sizes. Practical rule: a drawing marked DIN 508 → the DIN page; marked ISO 299, or ordered against a machine builder's slot-width spec → this page. Material and hardness stay per RFQ on both.
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