DIN 980-V vs ISO 7719 & DIN 980-M vs ISO 7042

Quick answer: DIN 980-V and DIN 980-M replacements

DIN 980 is a withdrawn legacy standard for all-metal prevailing-torque hexagon nuts. The DIN form must be identified before conversion:

1. DIN 980-V → ISO 7719: Type/Style 1, regular-height all-metal prevailing-torque nut
2. DIN 980-M → ISO 7042: Type/Style 2, high or thick all-metal prevailing-torque nut

DIN 980-M is the form most commonly encountered in commercial DIN 980 stock. That market convention is useful when searching for a supplier, but it is not permission to assume M form on a controlled legacy drawing.

View the DIN 980 drawing and dimensions, or compare the DIN 985 non-metallic-insert family.

Correct DIN 980 cross-reference

Legacy callout	Principal ISO relationship	Type and height	Procurement status
DIN 980-V	ISO 7719	Type/Style 1, regular height	Correct primary comparison for the V form
DIN 980-M	ISO 7042	Type/Style 2, high/thick height	Correct primary comparison for the M form and the most common commercial DIN 980 form
DIN 980 without V/M	Not enough information	Height series is unknown	Inspect the drawing, old specification or sample before conversion

The two arrows are product-family relationships, not a claim that every DIN and ISO edition has identical dimensions or performance. Preserve the complete thread, nut class, finish and prevailing-torque requirement.

DIN 980-V vs DIN 980-M: explicit differences

Feature	DIN 980-V / ISO 7719	DIN 980-M / ISO 7042	Procurement impact
Legacy DIN form	V	M	The form letter is a functional part of the old designation
ISO product family	ISO 7719	ISO 7042	Do not route both forms to ISO 7042
Type/style	Type/Style 1	Type/Style 2	They belong to different ISO dimensional families
Height series	Regular height	High/thick height	Changes installation envelope and available thread engagement
Commercial prevalence	Less commonly encountered	Most common market DIN 980 stock	Supplier default is often M, but a controlled drawing still governs
Width across flats s	Verify the ISO 7719 size table against the DIN-V drawing	Verify the ISO 7042 size table against the DIN-M drawing	Affects socket fit, counterbores and tooling
Width across corners e	Controlled by the Type 1 table	Controlled by the Type 2 table	Affects radial clearance and minimum corner geometry
Metal-body / wrenching height	Regular-height dimensional envelope	Greater high/thick dimensional envelope	Affects tool contact and usable thread length
Overall height	Lower family	Higher family	Can create clearance conflicts or change protruding bolt length
Locking-zone construction and location	Must match the approved V-form drawing and ISO 7719 product	Must match the approved M-form drawing and ISO 7042 product	Same all-metal principle does not prove identical deformation geometry or orientation
Thread series	Preserve diameter and pitch; confirm the applicable coarse/fine branch	ISO 7042 current basic route is coarse pitch; a fine-pitch high nut requires the applicable fine-thread branch	Never remove a pitch such as M20 × 1.5 during conversion
Nut class and proof load	Specify the class allowed by the selected Type 1 standard	Specify the class allowed by the selected Type 2 standard	Similar appearance does not prove equal load capacity
Initial prevailing torque	Test to the governing specification and mating fastener	Test to the governing specification and mating fastener	Dimensional fit alone does not confirm locking performance
Reuse prevailing torque	Must remain above the stated minimum after permitted cycles	Must remain above the stated minimum after permitted cycles	Do not approve reuse from appearance alone
Material, coating and lubrication	Must be controlled with the mating thread	Must be controlled with the mating thread	Changes friction, galling risk, preload and prevailing torque

The most important dimensional difference is the height family: V routes to regular Type 1, while M routes to high/thick Type 2. Exact values for s, e, wrenching height and overall height must come from the controlled size tables for the nominal diameter and edition; do not insert one catalogue value into every DIN/ISO conversion.

Why the standards can be cross-referenced

DIN 980-V, DIN 980-M, ISO 7719 and ISO 7042 all describe all-metal prevailing-torque hexagon nuts. They create rotational resistance through a controlled metal locking zone rather than a nylon/polyamide insert. This shared product function and the DIN-to-ISO succession path make the comparisons useful to buyers.

They are not one interchangeable shape because Type 1 and Type 2 use different height families. In addition, editions may differ in widths, height limits, bearing geometry, tolerances, nut classes, proof load, prevailing-torque requirements, test references and marking.

Coarse and fine pitch must stay separate

The basic ISO 7719 and ISO 7042 routes describe their applicable all-metal families; ISO 7042:2025 is the current coarse-pitch high-nut branch. A fine-pitch legacy callout cannot be converted by retaining only the nominal diameter.

For example, preserve M20 × 1.5, not merely M20. For a high M-form fine-thread requirement, review the applicable ISO 10513 fine-pitch family and edition. For any V-form fine-thread callout, identify the applicable Type 1 fine-thread product standard from the controlled specification instead of silently substituting coarse-pitch ISO 7719.

All-metal locking is not DIN 985 nylon locking

Feature	DIN 980-V / DIN 980-M	DIN 985 / ISO 10511
Locking principle	All-metal prevailing-torque feature	Non-metallic insert interference
Polymer insert	No	Yes
Temperature limitation	Determined by metal, heat treatment, coating, lubricant and joint	Also limited by insert material
Replacement relationship	Choose V/Type 1 or M/Type 2	Different low nylon-insert product family

All-metal construction removes the polymer insert, but it does not create a universal temperature rating. The actual material system, coating, lubrication, bolt and service environment still govern acceptance.

ASME, UNI and JIS relationship classification

The primary DIN/ISO cross-reference remains ISO 7719 for V and ISO 7042 for M. For regional procurement searches, add UNI 7474 and JIS B 1187-2 as related counterparts and identify their exact relationship before substitution.

Regional reference	Why it appears in supplier searches	Actual relationship to DIN 980
ASME B18.16.6	Covers related inch-series prevailing-torque locknut products	Approximate functional reference only; thread system, dimensions, style and performance differ
UNI 7474	Italian self-locking-nut counterpart used in European procurement tables	Valid regional cross-reference; confirm whether the offered form matches DIN 980-V or M, then compare height, s, e, thread, nut class and prevailing torque
JIS B 1187-2	Japanese reference for the related all-metal prevailing-torque nut family	Valid functional cross-reference; confirm JIS type/edition, height series, dimensional table, proof load, torque test and marking before substitution

These regional codes are useful, mainstream purchasing counterparts. They explain why the parts are cross-referenced, but they do not remove the DIN V/M distinction or prove one-to-one dimensions for every size and edition.

Installation, prevailing torque and reuse

The locking feature must fully engage the mating bolt thread in the intended direction. Some all-metal designs have a localized locking zone or installation orientation, so follow the exact standard drawing and manufacturer instructions instead of applying one universal orientation rule.

Confirm both initial and reuse prevailing torque using the governing performance requirement and controlled mating fastener. Coating wear, thread damage and repeated cycles can change torque. Reuse is allowed only when the specification permits it and the measured torque remains within limits.

Stainless or poorly lubricated all-metal thread pairs can gall. Material, hardness, surface treatment and approved lubrication must be selected together. Uncontrolled lubrication is not a harmless fix because it also changes the torque–tension relationship and prevailing torque.

DIN 980 RFQ and conversion checklist

Include:

1. DIN 980 form: V or M
2. Conversion target: ISO 7719 Type 1 for V or ISO 7042 Type 2 for M
3. Exact standard edition
4. Complete diameter, pitch and thread tolerance
5. Regular-height or high/thick height requirement
6. Width across flats s, corners e, wrenching height and overall height when drawing-critical
7. Nut property class, proof load, material and heat treatment
8. Initial and reuse prevailing-torque limits and test method
9. Mating-bolt class, coating, thread condition and installation orientation
10. Finish, lubrication, corrosion, temperature, inspection and traceability requirements

Examples:

Legacy DIN 980-V, M12 coarse pitch, convert only to an approved ISO 7719 Type 1 regular-height part after dimensional and prevailing-torque comparison.

Legacy DIN 980-M, M12 coarse pitch, ISO 7042 Type 2 high/thick candidate, Class 10, zinc flake; confirm controlled dimensions, coating, initial/reuse prevailing torque and lot traceability.

A bare DIN 980 M12 order is incomplete if the V/M form is unknown. Commercial stock will often return the M form, but the buyer should not turn that default into an undocumented engineering change.

Related resources

• DIN / ISO / ASME / JIS cross-reference chart
• DIN 980 drawing and dimensions
• DIN 985 vs ISO 10511 nylon-insert nuts
• DIN 982 vs ISO 7040 / ISO 10512 insert lock nuts
• All-metal prevailing-torque nut products

Use the cross-reference to identify the correct family. Final acceptance requires the DIN form, exact pitch, dimensional table, nut class, proof load and measured prevailing-torque performance.