Westfield Fasteners Product Specification:

DIN 97 - Slotted Countersunk Woodscrews

This product guide contains the specification for metric sized slotted countersunk woodscrews, a series of standard parts available from Westfield Fasteners. The basis of this specification is the internationally recognised DIN standard DIN 97.

Product Description

Slotted Countersunk Woodscrews, giving a flush, smooth and snag free finish when fitted. For use with any wood based projects. In comparison with the more readily available chipboard or particle board types, these screws are the traditional type of wood screw, with their slot drive and fuller thread form. Please refer to the dimensions and tolerances below when replacing existing woodscrews, as there can be wide variation between actual and nominal diameters, and between batches. Please note that woodscrews of similar type can be found under British Standard BS1210, and have their own form, dimensions and tolerances.

Scope of the DIN standard.

DIN 97 specifies the characteristics, tolerances and the variation in form of metric sized slotted countersunk wood screws, and covers thread diameters from 1.6mm, up to and including 10mm. Table 1 below defines the overall dimensions and tolerances for slotted countersunk woodscrews, whilst table 2 defines the tolerance on the shank length.

Thread Size		1.6	2	2.5	3	3.5	4	4.5	5	5.5	6	7	8	10
shank diameter, d_s	max	1.60	2.00	2.50	3.00	3.50	4.00	4.50	5.00	5.50	6.00	7.00	8.00	10.00
shank diameter, d_s	min	1.20	1.60	2.10	2.60	3.02	3.52	4.02	4.52	5.02	5.52	6.42	7.42	9.42
head diameter, d_k	nom	3	3.8	4.7	5.6	6.5	7.5	8.3	9.2	10.2	11	12.5	14.5	18
	max	3.30	4.18	5.08	5.98	6.95	7.95	8.75	9.65	10.75	11.55	13.05	15.05	18.55
	min	2.70	3.43	4.33	5.23	6.05	7.05	7.85	8.75	9.65	10.45	11.95	13.95	17.45
head height, k	max	0.96	1.2	1.5	1.65	1.93	2.2	2.35	2.5	2.75	3	3.5	4	5
slot width, n	nom	0.4	0.5	0.6	0.8	0.8	1	1	1.2	1.2	1.6	2	2	2.5
	max	0.60	0.70	0.80	1.00	1.00	1.20	1.20	1.51	1.51	1.91	2.31	2.31	2.81
	min	0.46	0.56	0.66	0.86	0.86	1.06	1.06	1.26	1.26	1.66	2.06	2.06	2.56
slot depth, t	max	0.45	0.6	0.7	0.85	1.0	1.1	1.1	1.3	1.4	1.6	1.9	2.1	2.6
slot depth, t	min	0.32	0.4	0.5	0.6	0.7	0.8	0.8	1.0	1.1	1.2	1.4	1.6	2.0

length	+/-
8-10	0.75
12-18	0.90
20-30	1.00
35-50	1.25
60-80	1.50

DIN 97 - Slotted Countersunk Woodscrews

Figure 1: Slotted Countersunk Woodscrew

Table 1: Dimensions & Tolerances according to DIN 97 (mm)

Table 2: Shank Length Tolerance according to DIN 97 (mm)