Slotted Countersunk Head Wood Self Tapping Screw

The Slotted Countersunk Head Wood Self Tapping Screw produced by the Xiaoguo® factory, can sit fully flush inside wood when used with a matching countersink drill bit. This way the fixing part stays hidden and makes the finished items look neat.

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Product Description

A Slotted Countersunk Head Wood Self Tapping Screw is a type of woodworking fastener with a conical head (with a 90° taper angle) and a Slotted groove at the top. The head can be fully inserted into the pre-cut conical holes in the wood, and after tightening, the head will be flush with or slightly lower than the wood surface. The screw body has deep and coarse wood threads， and the tail is a conical pointed head. It can be directly screwed into the wood (for hardwood or large diameters， it is recommended to pre-drill a hole). This Slotted Countersunk Head Wood Self Tapping Screw is suitable for connecting and fixing wood products that require a flat surface and no exposed heads.

English name	Slotted Countersunk Head Wood Self Tapping Screw
Common standards	DIN 97
Head type	Countersunk / Flat Head
Slot type	Slotted
Thread type	Wood thread (coarse pitch, deep pitch)
Tip form	Conical self-drilling tip head

Structural features

The structure features of Slotted Countersunk Head Wood Self Tapping Screw will be introduced in five parts.

Head structure

1.Head shape: Conical, like a funnel shape, usually with a cone angle of 90°. The top surface of the head is flat, and the sides are inclined.

2.Head dimension：The head outer diameter is about 1.8 to 2.2 times the screw thread diameter, and head height is around 0.5 to 0.6 times the thread diameter.

3.Head usage：After fastening this Slotted Countersunk Head Wood Self Tapping Screw, the whole screw head fits into the pre-made tapered hole on wood. It stays flush or a little below the wood surface and will not stick out.

Straight slot design

1.Drive type is straight slot. The groove goes straight from the middle out to both sides.

2.Slot width ranges from 0.6 mm to 2.0 mm, slot depth is 0.3 mm to 0.8 mm. Both ends of the slot are made with round corners.

3.The characteristics of the slot: It can be driven by the most common flat-head screwdriver.

Rod structure

1.Rod form: It is divided into full thread and partial thread types.

Thread structure

1.Thread type: Typical Wood Thread, not the common mechanical thread.

2.Profile: The tooth profile angle is approximately 60°, but the tooth tip is very sharp, and the tooth base has a smooth arc transition.

3.Tooth spacing: relatively wide.

Tip structure

1.Tip shape: Conical tip, with a taper of approximately 30°–45°. The tip is not extremely sharp; instead, it has a very small flat surface or a round head.

Slotted Countersunk Head Wood Self Tapping Screw

Mon	2.5	3	3.5	4	4.5	5	5.5	6	7	8	10
P	1	1.2	1.4	1.6	1.8	2	2.2	2.5	2.8	3	3.5
ds min	2.25	2.75	3.2	3.7	4.2	4.7	5.2	5.7	6.64	7.64	9.64
ds max	2.5	3	3.5	4	4.5	5	5.5	6	7	8	10
dk max	5	6	7	8	9	10	11	12	14	16	20
dk min	4.7	5.7	6.64	7.64	8.64	9.64	10.57	11.57	13.57	15.57	19.48
k max	1.4	1.7	2	2.2	2.7	3	3.2	3.5	4	4.5	5.8
n min	0.6	0.8	0.9	1	1.2	1.2	1.4	1.6	18	2	2.5
n max	0.85	1.05	1.15	1.35	1.55	1.55	1.75	1.95	2.15	2.35	2.85
t max	0.96	1.11	1.35	1.45	1.7	1.94	2.04	2.19	2.55	2.8	3.5
t min	0.64	0.79	0.95	1.05	1.3	1.46	1.56	1.71	1.95	2.2	2.9