NAS6612 bolts
NAS6612 is the 3/4-16 UNJF-3A size of the NAS6603–NAS6620 close-tolerance hex head bolt: alloy steel, long thread, 160 ksi. Machined to order in Houston.
NAS6612, machined to the standard.
NAS6612 is one diameter in the NAS6603–NAS6620 series. The last two digits give the diameter in sixteenths of an inch, so NAS6612 is the 3/4 in. bolt, threaded 3/4-16 UNJF-3A. The dash number that follows gives the grip length in sixteenths: NAS6612-10 has a 5/8 in. grip.
NAS6603 through NAS6620 is the long-thread version of the NAS6203 bolt: alloy steel (4140, 4340 or 8740), close tolerance, reduced major thread diameter, 160 ksi minimum tensile, cadmium plated. It is the design replacement for NAS1303 through NAS1320, which has been inactive for new design since 1981 but is still called out on older drawings and can be made to its sheet.
- Machined from certified bar to the standard; no hot heading
- AS9100D and ISO 9001:2015 quality system; CAGE 8HH90
- DFARS-compliant material available on request
- No minimum quantity; prototype through production
- Material test reports and certificates of conformance with the order
Send the full part number with the dash number and code letters, the quantity, the required delivery and the documentation your purchase order calls for.
NAS6612 at a glance
| Detail | Specification |
|---|---|
| Part number | NAS6612 |
| Thread | 3/4-16 UNJF-3A |
| Nominal diameter | 0.750 in. |
| Standard | NAS6603 thru NAS6620 (current); NAS1303 thru NAS1320 (inactive for design, see NAS6603) |
| Material | 4140, 4340 or 8740 alloy steel; cadmium plated (default) or chromium plated (C) |
| Strength | 160,000 psi minimum tensile |
| Head | Low-profile hex head; drilled shank (D), drilled head (H) or both |
| Dash number | Grip length in sixteenths of an inch |
Reference only; the current revision of the standard on your order governs.
Reading a NAS6612 part number.
A complete callout is the base number, a dash number for grip, and code letters for options: NAS6612-10 is the plain bolt with a 5/8 in. grip. The table shows the code letters this series uses.
| Element | Meaning |
|---|---|
| NAS6612 | 3/4 in. diameter, 3/4-16 UNJF-3A thread |
| Dash number | Grip in 1/16 in. increments |
| C | Chromium plated |
| L / P | Self-locking element |
| D / H | Drilled shank / drilled head |
NAS6612 dash numbers and grip lengths
The dash number is the grip, the unthreaded length under the head, in sixteenths of an inch. The standard lists the dash numbers available for each diameter; longer grips continue the same rule.
| Dash | Grip | Dash | Grip |
|---|---|---|---|
| -1 | 1/16 (0.0625) in. | -25 | 1-9/16 (1.5625) in. |
| -2 | 1/8 (0.125) in. | -26 | 1-5/8 (1.625) in. |
| -3 | 3/16 (0.1875) in. | -27 | 1-11/16 (1.6875) in. |
| -4 | 1/4 (0.25) in. | -28 | 1-3/4 (1.75) in. |
| -5 | 5/16 (0.3125) in. | -29 | 1-13/16 (1.8125) in. |
| -6 | 3/8 (0.375) in. | -30 | 1-7/8 (1.875) in. |
| -7 | 7/16 (0.4375) in. | -31 | 1-15/16 (1.9375) in. |
| -8 | 1/2 (0.5) in. | -32 | 2 in. |
| -9 | 9/16 (0.5625) in. | -33 | 2-1/16 (2.0625) in. |
| -10 | 5/8 (0.625) in. | -34 | 2-1/8 (2.125) in. |
| -11 | 11/16 (0.6875) in. | -35 | 2-3/16 (2.1875) in. |
| -12 | 3/4 (0.75) in. | -36 | 2-1/4 (2.25) in. |
| -13 | 13/16 (0.8125) in. | -37 | 2-5/16 (2.3125) in. |
| -14 | 7/8 (0.875) in. | -38 | 2-3/8 (2.375) in. |
| -15 | 15/16 (0.9375) in. | -39 | 2-7/16 (2.4375) in. |
| -16 | 1 in. | -40 | 2-1/2 (2.5) in. |
| -17 | 1-1/16 (1.0625) in. | -41 | 2-9/16 (2.5625) in. |
| -18 | 1-1/8 (1.125) in. | -42 | 2-5/8 (2.625) in. |
| -19 | 1-3/16 (1.1875) in. | -43 | 2-11/16 (2.6875) in. |
| -20 | 1-1/4 (1.25) in. | -44 | 2-3/4 (2.75) in. |
| -21 | 1-5/16 (1.3125) in. | -45 | 2-13/16 (2.8125) in. |
| -22 | 1-3/8 (1.375) in. | -46 | 2-7/8 (2.875) in. |
| -23 | 1-7/16 (1.4375) in. | -47 | 2-15/16 (2.9375) in. |
| -24 | 1-1/2 (1.5) in. | -48 | 3 in. |
How Cyclone makes them
Bar stock certified to the material specification is cut, turned and threaded to the standard’s dimensions, with drilled heads or shanks and head markings as the part number requires. Plating and locking elements are applied through partner facilities to the standard.
Lead time
Quoted on each order. Because the parts are machined from bar rather than scheduled through a heading run, lead time is set by machining capacity and material availability. Ask for the current lead time with your RFQ.
Quality
Cyclone’s published certifications include AS9100D, AS9120B, ISO 9001:2015, API Spec Q1, API 20E and API 20F. See quality and certifications.
Documentation
Material test reports and certificates of conformance ship with the order. Additional inspection reports and documentation are quoted to the purchase order.
Questions before you quote
What thread is NAS6612?
3/4-16 UNJF-3A. The bolt has a 0.750 in. nominal diameter.
What does the dash number on NAS6612 mean?
The grip length in sixteenths of an inch. NAS6612-8 has a 1/2 in. grip and NAS6612-16 has a 1 in. grip.
What material is NAS6612?
4140, 4340 or 8740 alloy steel; cadmium plated (default) or chromium plated (C). Minimum tensile strength is 160,000 psi.
Does Cyclone stock NAS6612?
No. Every part is made to order from certified bar, which is why there is no minimum quantity and why the quote confirms sizes and lead time.
Is DFARS-compliant material available?
Yes, on request. This refers to material sourcing; state the DFARS clause on your purchase order.