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DIN 985 nylon insert lock nuts in zinc plated steel, showing the blue nylon ring at the top face.

Zinc plated nyloc nuts in mixed sizes stacked together, blue insert visible in each nut.

Two nylon insert lock nuts standing upright, showing the rolled collar that retains the blue ring.

Seven DIN 985 lock nuts arranged by size, each with a blue polyamide insert.

DIN 985 Nylon Insert Lock Nuts — Zinc Plated Nyloc Nuts, M8 to M16

These DIN 985 lock nuts carry a blue nylon ring in the top face, so the bolt thread cuts its own path and stays gripped. The interference fit separates them from a plain nut: the nylon recovers elastically and keeps prevailing torque even after the joint settles. As nylon insert lock nuts, they need no adhesive or second nut, so assembly handles one part. The zinc plated nyloc nuts cover M8 to M16 in blue-white zinc for indoor and covered outdoor work. The limit comes from the nylon, not the steel. Coating, insert colour, marking and packing are customizable.

Sample:

Packing:

Cartons+plastic Bags,support customized

Brand name:

Product name:

Nylon Lock Nut

MOQ:

1000 but can negotiate

Place of origin:

Guangdong, China

OEM&ODM:

Quality guarantee:

Material and treatment:

Zinc Plated

Finish:

Zinc Plated,support customized

Material:

carbon Steel,support customized

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Structure and Design

Element	What the photos show	Function
Hex body	Six flats, standard wrench drive	Same handling as a plain hex nut
Top collar	A raised rim rolled over the insert at the top face	Mechanically retains the nylon ring so it cannot fall out
Nylon ring	Blue ring, clearly visible in the collar	Forms the locking element
Ring bore	Slightly smaller than the thread diameter	Creates the interference that produces prevailing torque
Thread	Internal thread through the body, stopping below the ring	Full engagement up to the insert
Chamfer	Chamfered thread entry at the bottom	Faster starting and fewer cross-threads
Plating	Blue-white zinc over the whole body	Barrier plus sacrificial protection for carbon steel

How the Nylon Insert Locks

Stage	What happens	Result
Starting the nut	Bolt thread meets the smaller bore of the nylon ring	A slight resistance is felt by hand
Cutting in	The steel thread cuts or deforms a helical path in the nylon	The ring moulds itself to that thread
Seating	Nut face contacts the part and clamp load builds	Joint is tightened to the required torque
In service	Nylon tries to recover its shape against the thread flanks	Continuous prevailing torque resists vibration loosening
After relaxation	Clamp load may drop slightly as parts settle	The nylon still holds, which a plain nut would not
On removal	The thread re-cuts the same path	Nut can be reused, with reduced prevailing torque each time

Comparison with Other Locking Methods

Method	How it locks	Reusable	Temperature limit	Note
Nylon insert nut (DIN 985)	Elastic interference on the thread	Limited number of times	Set by the nylon insert	No adhesive, no second part, clean removal
All-metal prevailing torque nut	Deformed thread section grips the bolt	Limited	Set by the metal	Survives higher temperatures than nylon
Serrated flange nut	Teeth bite the bearing surface	Yes, with reduced grip	Set by the metal	Locks against the surface, not the thread
Nylon insert high nut (DIN 982)	Same principle, taller body	Limited	Set by the nylon	More thread engagement than DIN 985
Threadlocking adhesive	Chemical cure in the thread	No, breaks on removal	Set by the chemistry	Needs clean threads and cure time

Size Range and What to Confirm

Size	Thread	What to confirm before ordering
M8	M8 × 1.25 (coarse)	Across flats, height, grade, coating thickness
M10	M10 × 1.5 (coarse)	Across flats, height, grade, coating thickness
M12	M12 × 1.75 (coarse)	Across flats, height, grade, coating thickness
M14	M14 × 2 (coarse)	Across flats, height, grade, coating thickness
M16	M16 × 2 (coarse)	Across flats, height, grade, coating thickness

Material, Plating and the Insert Limitation

Aspect	Detail
Body material	Carbon steel, per the product title
Plating	Zinc, blue-white
Plating behaviour	Barrier protection plus sacrificial action at scratches
Suitable environment	Indoor, covered outdoor, dry industrial
Weak points	Prolonged wetting, salt, acid, and any condition that attacks zinc
Insert material	Polyamide (nylon) ring
Insert temperature	Nylon softens well below steel limits; typical polyamide inserts are rated around 100–120 °C continuous, and cold below about −40 °C should be checked
Chemical caution	Solvents, strong acids and some oils can swell or soften the insert

Installation Notes

Point	Guidance
Orientation	The nylon ring faces away from the part, on the outer end of the nut
Thread condition	Clean, undamaged threads; debris pressed into the nylon reduces grip
Lubrication	Avoid oil or grease on the insert; it lowers prevailing torque
Torque	No torque value is published in the images; set it from the bolt class and joint requirement
Reuse	Reuse is possible but each cycle reduces prevailing torque; treat high-vibration joints as single-use
Washer	Use one on soft or slotted surfaces; the nut has no integral flange
Temperature	Keep within the insert's service window, not just the steel's
Thread engagement	Aim for full nut height of engagement, with at least a thread protruding past the ring

Typical Applications

Application	Why a nyloc nut fits
Machinery and equipment guards	Vibration resistance with clean, tool-only removal
Automotive and motorcycle brackets	Reusable joints that must not rattle loose
Pumps, fans and motors	Sustained vibration, moderate temperature
Furniture and fittings	Locking without a visible adhesive or second nut
Bicycle and e-bike assembly	Repeated service with reliable re-locking
Electrical enclosures	One-part fastening on panels and brackets
General repair work	Replaces a lost nut with a locking function built in

Material Marking Note

Reading	What it would mean	How this page treats it
Zinc plated carbon steel	The body is carbon steel with a zinc layer, matching the title	Adopted as the product's main specification
`A2-70` stamp	The nut could be A2 stainless in property class 70	Flagged, not claimed; the images are not clear enough to confirm

Quality Checkpoints

Checkpoint	What is checked	Method
Thread	Size, pitch, go/no-go, run-through below the insert	Thread gauges and matching bolt
Insert retention	Ring cannot be pushed out or rotated by hand	Manual and torque check
Prevailing torque	First-fit and fifth-fit torque within the agreed window	Torque tester on sample lots
Across flats	Width across flats within tolerance	Calliper per batch
Height	Nut height within tolerance	Micrometer per batch
Plating	Coverage, colour, no bare patches	Visual against a sealed sample
Thread after plating	Hand-thread a bolt through the insert after plating	Functional check
Insert condition	No cracks, flash or contamination in the ring	Visual inspection

Customization — Product and Packaging

Area	Adjustable	Buyer provides
Size	M8 to M16; other sizes on request	Size list
Thread pitch	Coarse or fine	Pitch requirement
Height pattern	DIN 985 low type or taller DIN 982 type	Drawing or type selection
Grade	Per requirement, e.g. class 8 or 10	Grade requirement
Insert colour	Blue as standard; other colours on request	Colour requirement
Coating	Blue-white zinc, yellow zinc, thicker layer	Coating standard and thickness
Marking	Grade stamp, logo, size marking	Artwork and position
Packaging	Poly bag, box, carton, bulk	Packing method and quantity
Label	Logo, size table, barcode	Artwork and label copy
Carton	Mark, packing list, carton size	Marking file and shipping data

FAQ

Q1. What does the nylon ring actually do?

It grips the bolt thread. Because the ring bore is smaller than the thread, the steel cuts a path through the nylon, and the material's elastic recovery keeps pressure on the thread flanks. That pressure is the prevailing torque that resists loosening.

Q2. Do I need threadlocker as well?

No. A nylon insert nut already provides prevailing torque. Adding adhesive is only useful where the insert has been degraded by heat or chemicals, and by then the nut should be replaced instead.

Q3. The title says zinc plated, but one photo shows a stamp that looks like A2-70. Which is it?

The title specifies zinc plated nyloc nuts in carbon steel, and this page follows that. The stamp in one photo is not legible enough to confirm, and A2-70 would indicate stainless. If material is critical, request the mill certificate or a clear photo before ordering.

Q4. How many times can it be reused?

It can be removed and refitted several times, but each cycle reduces the prevailing torque because the nylon path is already formed. For high-vibration joints, treat the nut as single-use.

Q5. What is the temperature limit?

The limit comes from the nylon insert, not the steel. Polyamide inserts are typically rated around 100–120 °C continuous; above that the insert softens and loses grip. Confirm the rating for your application.

Q6. Can it be used at low temperature?

Cold makes nylon stiffer, so prevailing torque rises and the insert becomes more brittle. Below roughly −40 °C, check with the supplier rather than assuming standard behaviour.

Q7. What is the difference between DIN 985 and DIN 982?

Both are nylon insert lock nuts; DIN 985 is the lower-height version and DIN 982 is taller. Choose by the available thread length and counterbore depth.

Q8. Which sizes are available?

M8, M10, M12, M14 and M16 per the product title, supplied as DIN 985 lock nuts. Other sizes can be quoted.

Q9. Are the dimensions standard DIN 985?

The images contain no dimension table. The product is offered to DIN 985, but across-flats and height should be confirmed against the drawing or a sample before you design a mating part.

Q10. Does the plating affect the thread fit?

Yes. Zinc adds thickness, so a plated nut on a plated bolt can feel tight, especially as the thread passes through the insert. Test-thread a bolt before mass assembly.

Q11. Why does the nut feel tight the whole way down?

That is the insert working. Resistance through the full travel is normal for a nyloc nut; a nut that spins freely all the way has a worn or missing insert.

Q12. Can the insert colour or material be changed?

Colour can be specified. Insert material changes, such as high-temperature grades, should be discussed as a separate engineering choice rather than a cosmetic option.

Q13. Can you mark our logo or the grade?

Yes, grade stamps, size markings and logos can be applied, with position and depth agreed before production.

Q14. How are they packed?

Poly bag, box, carton or bulk, with custom labels and barcodes. Packing quantity and carton data are confirmed per order.

Send the size, pitch, grade, coating and insert requirement, or attach your drawing, to receive a quotation for DIN 985 lock nuts in zinc plated steel, with samples for prevailing torque checks and custom marking or packing for your own brand.

Recommended

DIN 6923 Serrated Flange Nuts — Hex Flange Lock Nuts, M3 to M24

These DIN 6923 flange nuts are carbon steel hex nuts with an integrated flange, and the flange face carries a ring of angled serrations instead of a plain washer face. The serration does the work: as the nut tightens, the teeth bite the mating surface and resist backing out, which is why the same part is sold as hex flange lock nuts. The flange spreads clamp load over a wider area, so a separate washer is often unnecessary and assembly needs one part less. The published table runs from M3 to M24, with serrated flange nuts in M6 to M20 held for spot supply in grade 4.8 / 5.8, in blue-white or yellow zinc. Thickness, flange diameter, coating, marking and packaging can be customized.

Zinc Plated Square Nuts, GB Standard Carbon Steel for Timber Frame

These zinc plated square nuts are carbon steel fasteners with a square body, four chamfered corners and a chamfered top edge, finished in a blue-white zinc coating. The square form does the work: pulled into a timber pocket or held flat against a plate, the nut cannot spin, so one wrench on the bolt is enough. That is why square nuts for timber frame construction are paired with coach bolts, washers and connector plates in decks, fences and frame joints. As GB standard square nuts, the geometry follows the GB designation named in the product title, while the standard number and property class are confirmed on the drawing. Coating, chamfer, thread and packaging can be customized.

304 316 Stainless Steel Acorn Nuts — Hex Dome Cap Nuts, M3 to M20

These stainless steel acorn nuts combine a hex body with a closed dome, so a stud end is covered rather than left exposed. The hex dome cap nuts shown here are polished to a mirror finish in 304 and 316 stainless steel, in sizes from M3 to M20, with coarse and fine pitches listed per size. Because the dome closes the end, the thread is shielded from dust and the joint gets a rounded, snag-free appearance. Buyers who specify 304 stainless steel cap nuts usually cover indoor and general outdoor work, while 316 is chosen near salt water and chlorides. Height, across-flats, pitch, finish, marking and packaging can be customized.

Stainless Steel Threaded Inserts, SL Type Knurled Insert Nut M2 M3

These stainless steel threaded inserts are machined from 303 stainless steel with a double twill knurl crossing in two directions, so the SL type knurled insert nut resists rotation under torque rather than gripping on one helix alone. Threads run from M2 to M20, and the size chart details M2 to M8 with inside diameter, pitch, outside diameter and slot width. Because the body is stainless steel rather than brass, these insert nuts for plastic molding suit housings that must stay clean and resist rust in humid indoor service. Ultrasonic, heat, press-in, expansion press-in and self-tapping installation are all supported, each aiming at a flush finish. Length, knurl, finish and packaging can be customized.

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