Stainless steel Type V conical external serrated lock washers

Stainless Steel Countersunk Serrated Lock Washers

Type V Serrated Washers for 90° Countersunk Head Screws

Conical Type V washers seat beneath compatible countersunk screw heads. Their twisted external serrations provide localized contact while the profile follows the inclined underside of the head. Available to traditional DIN 6798 V dimensions and customer specifications.

Type

Countersunk Serrated Lock Washer

Form

DIN 6798 Type V

Screw Type

Compatible 90° Countersunk Heads

Materials

304 / A2, 316 / A4 Stainless Steel

DIN Size Range

M2–M16 Listed Sizes

Main Sizes

M3 / M4 / M5 / M6 / M8 / M10 / M12

Profile

Conical / Countersunk Serrated

Custom Options

Size / Material / Geometry / Drawing

Request A Quote

Product Overview

Stainless Steel Countersunk Serrated Lock Washers combine a thin conical body, round center hole and radial external twisted teeth. Unlike flat DIN 6798 A or J washers, the Type V profile is formed for an inclined countersunk bearing surface.

The washer fits between a compatible countersunk screw head and a prepared mating countersink. Matching the head angle, head diameter and washer geometry helps avoid point contact, uneven seating, distortion and poor serration engagement. The serrated contact may resist relative rotation, but does not guarantee that a joint will never loosen.

VALTOR supplies 304 / A2 and 316 / A4 options for machinery, equipment panels and OEM assemblies. For an RFQ, provide screw size, head angle and diameter, washer d1 and d2, thickness, material, quantity and drawing. DIN 6798:1988-07 is withdrawn without replacement; the designation remains a traditional purchasing and dimensional reference, not a current standard.

Technical Specifications

Product

Stainless Steel Countersunk Serrated Lock Washers

Alternative Names

DIN 6798 V Washers / DIN 6798V Lock Washers / Type V Serrated Washers / Countersunk Tooth Lock Washers

Traditional Reference

DIN 6798 V; available to traditional dimensions and customer specifications

DIN Status

DIN 6798:1988-07 withdrawn without replacement; still used commercially by agreement

Form / Geometry

Form V — conical countersunk washer with round central hole and external radial serrations

Primary Screw Compatibility

Compatible metric countersunk screws with approximately 90° included head angle; verify the complete head and recess geometry

Traditional Size Family

M2, M2.5, M3, M3.5, M4, M5, M6, M8, M10, M12, M14 and M16

Main Commercial Focus

M3, M4, M5, M6, M8, M10 and M12; availability and lead time confirmed per order

Materials

304 / A2 and 316 / A4 Stainless Steel; spring steel / carbon steel where specified

Material Condition

Condition and hardness appropriate to serration function must be agreed; stainless and hardened spring-steel versions are not automatically equivalent

Surface

Natural stainless; passivation where required. Carbon/spring steel finish, including zinc plating, according to order

Key Dimensions

d1 inside diameter; d2 outside diameter; s material thickness; α conical profile angle; z serration count

Additional Fit Parameters

Free conical height, tooth form/direction, screw-head diameter and mating countersink depth

Typical Installation

Under the countersunk screw head, within a compatible prepared countersink

Typical Applications

Machinery, equipment panels, fixtures, metal components, industrial housings and OEM assemblies

Custom Supply

Special diameters, thickness, profile, conical height, serration geometry/count, material and finish by drawing

Documentation

Material certification, dimensional/profile and serration inspection, and third-party support as agreed

Representative DIN 6798 V Dimensions

For Screw	Hole d1 (mm)	Outside d2 (mm)	Thickness s (mm)	Min. Serrations z
M3	3.2	6.0	0.20	12
M4	4.3	8.0	0.25	14
M5	5.3	9.8	0.30	14
M6	6.4	11.8	0.40	16
M8	8.4	15.3	0.40	18
M10	10.5	19.0	0.50	20
M12	13.0	23.0	0.50	26

Dimensions are in millimetres and are representative purchasing data, not a complete tolerance specification. Confirm the ordered size, tolerances, material condition and profile before production. Additional listed sizes M2, M2.5, M3.5, M14 and M16 are subject to supply.

M1.6, M7 and sizes M18–M30 are not listed DIN 6798 V sizes. Larger or otherwise nonstandard parts may be offered by drawing as custom countersunk serrated washers, not strict DIN 6798 V.

Countersunk Geometry, Serration Contact & Screw Matching

V-Shaped Profile

The conical form follows the inclined head underside; it is not a flat external-tooth washer.

Matched Assembly

Countersunk screw head → Type V conical serrated washer → prepared countersunk component. Install the concave side toward the screw head.

Head Angle Matching

Traditional Type V geometry is approximately 90°. An 82° inch countersunk head or another angle requires separate compatibility verification or a custom washer.

Serrated Contact

During tightening, the serrated edges engage the head underside and mating bearing surface locally. Contact depends on clamp load, tooth geometry, material and surface hardness.

Finished Head Height

Adding a washer can change seating height. A countersink designed for a bare screw may leave the head protruding; critical flushness requires a recess designed for the screw-plus-washer combination.

A / J / V Comparison

A: external serrated flat type. J: internal serrated flat type. V: conical countersunk external serrated type. These forms are not interchangeable.

Surface Condition

Teeth may mark painted, decorative or soft surfaces. Coatings and surface hardness can change engagement.

Performance Limits

DIN 6798 V is a traditional serrated washer, not a cam-type wedge-lock pair. No universal locking torque, holding force or vibration-proof performance is claimed.

304 / 316 Stainless Steel & Size Options

304 / A2 is a common choice for general machinery and corrosion-resistant equipment assemblies. 316 / A4 is an option for humid, outdoor, coastal and more corrosion-sensitive service. Neither grade is corrosion-proof; selection depends on exposure and the complete assembly.

Spring/carbon steel versions may be specified with zinc plating or another agreed finish. Serration function depends on suitable material condition and formed geometry: soft untreated stainless must not be assumed to perform identically to hardened spring steel.

Choose material with regard to corrosion, screw material, mating-surface hardness and application. Main commercial sizes are M3, M4, M5, M6, M8, M10 and M12; the additional traditional sizes are M2, M2.5, M3.5, M14 and M16. Stock and lead time are confirmed per enquiry.

Countersunk Profile & OEM Manufacturing

Custom Parameters

Inside diameter, outside diameter, thickness, countersunk angle, free conical height, serration geometry/count, material and finish.

Supply Basis

Traditional DIN 6798 V dimensions, customer drawing, approved sample or OEM requirement.

Nonstandard Profiles

82° or other head angles are supplied as custom countersunk serrated washers after fit confirmation, not represented as strict DIN 6798 V.

RFQ Information

Screw size, countersunk head angle, head diameter, d1, d2, thickness, material, quantity and drawing/sample. Include mating countersink details and flush-height requirements.

Production Agreement

Confirm tolerances, material condition, inspection documentation, packaging and any sample approval before manufacture.

Serration, Profile & Dimensional Quality

Dimensional Inspection

Inside diameter, outside diameter, sheet thickness and free conical height.

Profile Inspection

Conical profile and countersunk angle checked against the agreed drawing or purchasing reference.

Serration Inspection

Tooth count, uniformity, direction, formed shape and burr condition.

Material / Surface

Material verification, condition and surface finish or passivation where specified.

Functional Fit

Representative countersunk screw plus mating countersink: evaluate head seating, washer contact, conical fit, serration engagement and distortion.

Documentation

MTC/raw material report, dimensional, profile and serration inspection, material verification and third-party inspection support according to the order.

Applications

Countersunk screw and concave-up serrated washer during installation

Machinery Covers & Panels

Used beneath compatible countersunk screws in machinery components requiring low-profile fastening; final head height depends on recess design.

Industrial Equipment

For countersunk machine-screw joints needing both serrated contact and a conical bearing profile.

Fixtures & Mechanical Assemblies

Suitable for brackets, tooling and fixture components with correctly prepared countersunk seats.

Equipment Housings

304 / 316 stainless options support corrosion-resistant fastening in suitable housings.

OEM Countersunk Fastening

DIN 6798 V-style and custom drawing-based supply matched to screw size, profile, material and application.

Frequently Asked Questions

What is a DIN 6798 V Washer?

A thin conical serrated lock washer for compatible countersunk head screws. Its external twisted teeth provide localized contact within a prepared countersunk joint.

What is the difference between DIN 6798 A, J and V?

A is an external serrated flat washer; J is an internal serrated flat washer; V is a countersunk/conical external serrated washer.

What countersunk screw angle is DIN 6798 V designed for?

Traditional Type V products are intended for compatible metric screws with approximately 90° included head geometry. Other angles, including 82°, require verification or a custom washer. Head diameter and countersink depth also matter.

Is DIN 6798 still a current standard?

No. DIN 6798:1988-07 was withdrawn without replacement. DIN 6798 V remains a recognized purchasing designation, and parts continue to be commercially supplied to traditional dimensions by agreement.

Can VALTOR supply DIN 6798 V in 304 or 316 Stainless Steel?

Yes. 304 / A2 and 316 / A4 options, plus custom drawing-based configurations, can be supplied. Confirm material condition, geometry, quantity and inspection requirements when ordering.