Knurled Pins
Hartford Technologies custom manufactures precision knurled pins and knurled studs that provide the highest levels of straightness, roundness and hardness, without marks. Produced in high volumes in straight, diamond and helical styles, tapered and untapered, in diameters up to 3/8″ and lengths up to 3″.
Profile
A wide range of lengths, diameters and pitch is available. Knurled sections can have a straight, helical or diamond knurl configuration, with a variety of custom end configurations. Knurled pins are ideal for assembling parts with thin sections and, because of their greater number of serrations, are superior to grooved pins in fastening capacity, particularly where the application is subject to vibration and other mechanical shock.
Standard Materials
Every Hartford pin is made to order, so material is specified per program. The grades below are standard across our full pin range. If your print calls for a grade not listed here, send it over with your RFQ.
Bearing Grade Chrome Steel | Through-hardened alloy | High-load, high-wear applications where hardness matters more than corrosion performance
Carbon Steel | Low alloy | Cost-sensitive programs, commonly paired with a plating or finishing option
302 / 303 / 304 / 18-8 | 300 series stainless | General corrosion resistance, food, medical and washdown environments
316 | 300 series stainless | Chloride and marine exposure
416 / 420 | 400 series stainless | Corrosion resistance with higher hardness than the 300 series
440 / 440C | 400 series stainless | Maximum hardness in a stainless grade
All grades listed are produced under the same quality system and inspection process regardless of material.
Characteristics
The serrations on a knurled pin, when compressed by insertion into a hole, create forces that hold the fastener in place. Radial forces are distributed more evenly around the diameter of the hole than with grooved pins, because a knurled pin has more points of contact. The teeth may broach the mating hole when that material is softer and more ductile than the pin material.
Plating and Finishing
Typical Hardness
Hardness follows the material rather than the pin type. The values below apply across our pin range and match the figures published on our precision ball pages.
Bearing Grade Chrome Steel | Rockwell C 60 to 66
440C Stainless Steel | Rockwell C 58 to 62
Carbon Steel | Rockwell C 60 minimum
SS302/SS304/SS316 | Rockwell C 25-39
If your application has a specific hardness requirement, include it with your RFQ and we will confirm the material that meets it.
Why Choose Hartford Technologies
-
100 years of precision manufacturing
Trusted by OEMs in Aerospace, Medical, Automotive, and Industrial markets since 1926.
-
U.S. Engineering + China Manufacturing
Wholly owned foreign entity operations run under Hartford's own quality system
-
Precision Manufacturing Capabilites
Diameter tolerance held to +/-0.0001"
-
Clean & Ultra-clean Parts
Five-stage ultrasonic cleaning for clean and ultra-clean parts
Industries We Serve
Hartford pins are specified into production programs across the industries below. If your application is not listed, it is still worth a conversation. Pins are among the most widely specified components we make.
Knurled pins are specified where a fastener has to hold in thin-section assemblies or stay seated under vibration and mechanical shock. The knurl distributes radial force evenly around the hole, giving greater fastening capacity than a grooved pin.
Lead Times
-
Standard lead time is 14 to 16 weeks. Expedited production is available in 6 to 8 weeks and is quoted on request.
-
Minimum order value is $1,500. Minimum quantity varies with diameter, length, material and end configuration, so orders are qualified on value rather than piece count. Typical production runs are 10,000 pieces or more.
Not suitable for craft, hobby or small-quantity applications.
