HANDA. NINGBO

Part group 07 / 05 · Ningbo, China

Hex bolts,
class 8.8 and 10.9 to drawing.

DIN 931 with the thread held back, DIN 933 threaded to the head, or your own drawing. Class, head marking and coating are yours to set, and every repeat run is checked against the same card.

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Specification

Hex Bolts to drawing

Standards
DIN 931 / ISO 4014 (part thread), DIN 933 / ISO 4017 (full thread), DIN 601, ANSI B18.2.1, and special heads to drawing.
Sizes
M5 to M24 standard, M27 to M30 quoted. Length 12 to 300 mm, thread length b, m or L exactly as written on the print.
Property class
4.8, 8.8, 10.9 and 12.9 carbon steel; A2-70 and A4-80 stainless. Proof load and hardness tested per lot.
Galvanising
Hot-dip per ISO 10684, typically 50 to 85 microns, with the thread allowance so the nut still runs on after coating. Zinc plating 8 to 12 microns for indoor work.
Marking
Your class mark, your logo, or a blank head. Applied before plating, and photographed on the first piece for you to approve.

Every dimension is taken from your drawing or sample. Where this page and your drawing disagree, your drawing wins.

Where these parts go

Applications

Steel joints where class, thread length and coating meet at the same moment, and the bolt has to be both strong and still fit after galvanising.

Bolts

Hex, socket, flange, carriage and special-head bolts, class 8.8 to 12.9.

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Nuts & Washers

Hex, nyloc and cap nuts; flat, spring and lock washers in four materials.

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Stainless Bolts

A2 (304) and A4 (316), classes 50 to 80, passivated on request.

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Threaded Rods

Full-thread rod, double-end and tap-end studs, cut to length.

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Questions buyers ask

01
DIN 931 or DIN 933, what is the difference?
931 has thread on part of the shank, so the plain portion can act as a fit bolt in a reamed hole. 933 is threaded to the head, used where the joint is clamped by the nut. Same head, different thread length.
02
What does the 8.8 on the head actually mean?
Nominal 800 MPa tensile and about 640 MPa yield; 10.9 is 1000 and 900. The class is stamped before plating, and the proof load record for the lot is what proves it.
03
How thick is your hot-dip galvanising?
Typically 50 to 85 microns per ISO 10684, checked with a magnetic gauge on a sample per lot. Thinner zinc at 8 to 12 microns is what we quote for indoor assemblies.
04
Will the nut still fit after galvanising?
Yes. The thread is cut with the allowance the standard requires before coating. If your drawing calls for a specific allowance, state it and we hold to that instead of the default.
05
Can you make the bolt from steel we supply?
Yes, provided the mill certificate travels with the bar and the chemistry meets the class. We head, roll and heat treat to the class and report the chemistry we received.
06
How do you pack heavy bolts?
In 20 or 25 kg cartons on a pallet, or in returnable bins if your site uses them. Mixed sizes stay separated with lot labels so a site issue cannot mix classes.

Next step

Send one drawing.
Get a costed sheet.

Drawing or sample, material, quantity, and the destination port. We reply within one working day with unit price, tooling, lead time and shipping.

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