M4 x 0.70p Metric Coarse Nylon Hex Set Screw / Hex Bolts DIN 933

About Hex Bolts & Set Screws

Hex Bolts and Set Screws are the workhorses of the bolting world. The default fastener whenever you need to clamp two parts together with a spanner on both ends. Six-sided head driven with a spanner or socket, and a fully or partially threaded shank. A hex bolt is partially threaded (plain shank under the head); a hex set screw is fully threaded right up to the head. Used for metal-to-metal joints, machinery assembly, structural framing, and any application that needs reliable clamp load.

Recommended use Electrical assembly (non-conductive), food and pharmaceutical equipment, marine fittings where weight matters, and any application that needs chemical or electrical insulation. Not for high-load structural use; nylon has lower tensile strength than carbon or stainless steel.

Frequently Asked Questions

Material & Coating

Nylon PA 6.6 (also called polyamide 66) is the standard engineering polymer used for non-metallic fasteners. Nylon fasteners are non-conductive, non-magnetic, lightweight and chemically resistant. Most commonly supplied as Hobson-brand in the BNA range.

Important Nylon is hygroscopic. It absorbs water from the surrounding environment, which softens the material over time and reduces tensile strength. For wet or high-humidity service consider this in the design margin.

Benefits of Nylon

• Provides good toughness, tensile strength, non-conductive and resistance to creep, particularly in the high temperature range.
• Excellent wear properties, low coefficient of friction and exceptional chemical resistance to aromatic hydrocarbons, greases and oils.
• Nylon is a hygroscopic material which tends to absorb water or moisture from the surrounding environment. The amount of absorption will depend on the environmental conditions. When water or moisture is absorbed by Nylon, it behaves like a plasticizer in plastics, reducing the tensile strength and stiffness, and increasing elongation, impact strength and energy-absorbing characteristics.
• Nylon will perform well in long-range service in most applications.

Class Strength data for this material is in the Material & Coating section above.

Thread Pitch & Terminology

Thread Pitch (Metric) Metric fasteners measure thread pitch as the distance between thread peaks, expressed in millimetres. Metric also branches into three series: coarse (the default; widest tolerance, easiest to tap), fine (a tighter pitch for higher clamp load or thinner walls), and extra fine (the tightest pitch, used for thin-wall tube, precision instruments, and aerospace fittings where vibration loosening must be minimised). Always match the series as well as the size - a metric fine nut will not engage a metric coarse bolt of the same diameter, and an extra fine nut will not engage either. This product has a 0.70mm coarse pitch, meaning the peaks are 0.70mm apart.

How to Measure

Fastener Length This product has a head that sits on top of the material, so the length is measured from directly under the head to the tip of the thread. The head itself is not included in the size.

Thread Length On a screw the thread length runs from the start of the unthreaded section (called the shank) to the end of the thread. Set screws are fully threaded. If the length is 75mm, the thread length is 75mm. To view the thread length, select a length above.

Resources

Pricing & Delivery

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Disclaimer

Technical data Researched and compiled from numerous industry sources for the sole purpose of providing basic information. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person, and Bolt and Nut Australia is not responsible for any loss, claim or damages arising therefrom. In developing this information, Bolt and Nut Australia has made a determined effort to present it accurately.

Measurements Sizes are taken from supplier catalogues or hand-measured and should be used as a guide. Minor variation between batches is normal. Stock is sourced from various suppliers, so differences may exist between batches in thread length, markings, appearance or finish.

Product Photos & PDF Data Sheets Represent the product type, not exact size. PDFs are a reference guide only. Specifications may change without notice.

If you see any problems with any of our specifications or you require additional information please contact us.