1. Descriptions:
As with all types of self-drilling screws, this Phillips flat head
screw creates its own treads when driven into the material. This
prevents the need to drill an additional pilot hole. Flat screw
heads are among the most common types. When used with wood, they
lie flush with the surface of the material.
They can also be driven to the bottom of a counterbore and hidden
with a plug, making them well-suited for applications where it’s
desirable to have no visible screws.
Another benefit of using flat head wood screws is that they help to
maintain the integrity of the material. They can countersink and
seat flush without causing splintering or other damage. Certain
types of flat head screws can also be used to fasten wood to metal
materials
2. Specifications:
1. Name: DIN7504P flat head self drilling screws, countersunk head
tek screws
2. Grade: C1018, C1022,
SUS201,SUS410,SUS304,SUS316,A2-70,A2-80,A4-80
3. Size: 2.9x10mm--6.3x200mm
4. Standard: DIN7504P
5. Certification: ISO9001, SGS, CTI, ROHS
6. Thread Type: Type BSD, Type ASD, Type CSD, with wings, with
cutting thread
7. Point: #1 point (#1PT), #2 point (#2PT),#3 point (#3PT),#4 point
(#4PT),#5 point (#5PT)
3. Applications:
Fixing sheet metal for roofs, carports, fencing, sheds, garages and
more is as common an experience to tradies as it is to novice
builders. And both types of builder need to save time and money for
either business viability or more spare time.
For fixing sheet metal without the need to predrill, see
self-drilling screws—also known under the proprietary name ‘Tek’
screws—for a better and faster way to get the job done.
Available in a variance of head types, material compositions and
finishes, these screws have now become common place when thinner
metals need fixing to each other.
Self-drillers are identified by a point that is very like that of a
drill bit, often including a scalloped unthreaded shaft section
that helps to cut the metal quickly and smoothly.
4. Drawing Specifications:
| Thread dia | ST2.9 | ST3.5 | ST3.9 | ST4.2 | ST4.8 | ST5.5 | ST6.3 |
| P | 1.10 | 1.30 | 1.40 | 1.40 | 1.60 | 1.80 | 1.80 |
| a | Max | 1.10 | 1.30 | 1.40 | 1.40 | 1.60 | 1.80 | 1.80 |
| Dk | Max | 5.50 | 6.80 | 7.50 | 8.10 | 9.50 | 10.80 | 12.40 |
| Min | 5.20 | 6.44 | 7.14 | 7.74 | 9.14 | 10.37 | 11.97 |
| k | 1.70 | 2.10 | 2.30 | 2.50 | 3.00 | 3.40 | 3.80 |
| r | Max | 1.10 | 1.40 | 1.50 | 1.60 | 1.90 | 2.10 | 2.40 |
| Punch | 1.00 | 2.00 | 2.00 | 2.00 | 2.00 | 3.00 | 3.00 |
| type H | M | 3.00 | 4.20 | 4.60 | 4.70 | 5.10 | 6.80 | 7.10 |
| Q | Min | 1.40 | 1.62 | 2.03 | 2.11 | 2.59 | 2.95 | 3.33 |
| Max | 1.70 | 2.12 | 2.53 | 2.62 | 3.10 | 3.53 | 3.91 |
| type Z | M | 2.80 | 4.00 | 4.20 | 4.40 | 5.00 | 6.30 | 7.00 |
| Q | Min | 1.48 | 1.60 | 1.85 | 2.05 | 2.64 | 2.72 | 3.38 |
| Max | 1.73 | 2.06 | 2.31 | 2.51 | 3.10 | 3.18 | 3.84 |
| Dp | 2.30 | 2.80 | 3.10 | 3.60 | 4.10 | 4.80 | 5.80 |
| Self Drilling Screws, Type BSD – SAE J78-1998 |
| Nominal Size or | Threads | T | t | P | Min. Practical Nominal | Minimum |
| Basic Screw | Per Inch | Screw Lengths | Torsional |
| Diameter | | Formed Points | Strength |
| | | Major Diameter | Minor Diameter | Protusion Allowance | | (lb.-in.) |
| | | Min | Max | Min | Max | #2 Pt. | #3 Pt. | 90° Head | Csk Head | 90° Head | Csk Head | Steel Screws |
| | | #2 Pt | #2 Pt | #3 Pt | #3 Pt | |
| 4 | 0.112 | 24 | 0.114 | 0.11 | 0.086 | 0.082 | 0.163 | – | 5/16 | 3/8 | – | – | 14 |
| 6 | 0.138 | 20 | 0.139 | 0.135 | 0.104 | 0.099 | 0.19 | 0.22 | 5/16 | 3/8 | 3/8 | 7/16 | 24 |
| 7* | 0.151 | 19 | 0.153 | 0.146 | 0.113 | 0.109 | 0.137 | 0.157 | 5/16 | 3/8 | 3/8 | 7/16 | – |
| 8 | 0.164 | 18 | 0.166 | 0.161 | 0.122 | 0.116 | 0.211 | 0.251 | 3/8 | 7/16 | 7/16 | 1/2 | 42 |
| 10 | 0.19 | 16 | 0.189 | 0.183 | 0.141 | 0.135 | 0.235 | 0.3 | 7/16 | 1/2 | 1/2 | 9/16 | 61 |
| 12 | 0.216 | 14 | 0.215 | 0.209 | 0.164 | 0.157 | 0.283 | 0.353 | 1/2 | 5/8 | 1/2 | 5/8 | 92 |
| 1/4 | 0.25 | 14 | 0.246 | 0.24 | 0.192 | 0.185 | 0.318 | 0.393 | 1/2 | 5/8 | 1/2 | 5/8 | 150 |
| * Specs for #7 diameter drill screws are not included in SAE J78 at
this time. |
| Coarse Thread Self Drilling Screws – #3 Point |
| Nominal Size or | Threads | T | t | A | B |
| Basic Screw | Per Inch | Major Diameter | Minor Diameter | Drill Point Length | Drill Point Diameter |
| Diameter | | Max | Min | Max | Min | Max | Min | Max | Min |
| 5/16 | 0.3125 | 12 | 0.315 | 0.307 | 0.272 | 0.263 | 0.421 | 0.361 | 0.27 | 0.265 |
| 3/8 | 0.375 | 12 | 0.38 | 0.37 | 0.308 | 0.298 | 0.354 | 0.314 | 0.338 | 0.33 |
5. Advantages:
1. Quality control: we make 100% quality test during producing and
before shipping
2. Rich experience: we have been export screws for more than 20
years
3. Competitive prices: the better quality, but cheaper prices
4. Timely quotation: send you prices within one day
5. Good services: we supply OEM, ODM,OBM services and best
after-sale services
6. Punctual delivery: we can ship every order without delay
7. Easy contact: skype and wechat: majestytom, QQ: 30062277
6. More pictures:
DIN7504P CSK HEAD SELF DRILLING TEK SCREWS
