Screws & Bolts

Bolt and screw products organized by head form, joint function and standard family. Choose the fastening form first, then filter by diameter, length, grade, material and finish. Enter by product form first, then filter SKUs by standard, diameter, length, grade, material and finish.

Product Types

Hex Head Bolts

Shop Specs

The workhorse for high-strength bolted joints in steel structures and equipment. Made-to-order 4.8/8.8 carbon steel and 304/316L stainless, fully threaded per DIN 933 / GB/T 5783.

GB/T 1228GB/T 1231

Standard familyDiameter × lengthFull/partial thread

M12×40M16×60

2184 SKUs

Socket Head Cap Screws

Shop Specs

Socket head cap screws for equipment, nacelle and confined assemblies. Confirm head clearance, grade, material, thread length and locking method.

GB/T 70.1

Socket driveHead clearanceGrade

M8×20M6×20

435 SKUs

Carriage Bolts

Shop Specs

Square-neck carriage bolts for channel, timber and fence connections, round, countersunk and square heads, HDG carbon steel made to order, tamper-resistant.

GB/T 10GB/T 12

Head/drive styleDiameter × lengthProperty class

M6×20M6×25

70 SKUs

Flange Bolts

Planned

Flange Bolts quoted to drawing, standard and working conditions. This is a planned catalog type until demand and preferred SKUs are confirmed.

Flange thicknessGasket compressionGrade

Planned

U-Bolts

Shop Specs

U-bolts for pipes, brackets, solar rails and agricultural equipment. Specify pipe OD, inside width, leg length, thread length and corrosion finish.

DIN 3570

Pipe ODInside widthLeg length

M6×23M6×28

52 SKUs

Tapping Screws

Shop Specs

Tapping screws for sheet, roofing envelope and cable clip fastening, often specified with EPDM washers and caps. Confirm drill point or sharp point, sheet thickness and sealing boundary.

GB/T 15856.1GB/T 15856.2

Drill/sharp pointSheet thicknessScrew diameter

4.8×134.8×16

160 SKUs

Insulation Fasteners

Quote to Drawing

Insulation fasteners for insulation wool, sandwich panels and building envelope assemblies. Confirm insulation thickness, substrate, pin style and thermal-bridge/sealing requirements.

Insulation thicknessSubstratePin style

Quote to Drawing

Machine Screws

Shop Specs

Small-diameter machine screws for precision assembly, pan, countersunk and cylinder heads, fully threaded, primarily 304 stainless. For panels, electrical and instrumentation.

GB/T 818GB/T 819.1

Head/drive styleDiameter × lengthProperty class

M3×6M3×8

128 SKUs

Structural Bolts

Quote to Drawing

Heavy hex structural bolts for friction-type and bearing-type steel connections, supplied to GB/T 1228 and project specifications, mainly 10.9S with matched heavy hex nuts and structural washers. Sizes, torque coefficient and certificates confirmed per project.

GB/T 1228

Design standardGradeFaying surface

Quote to Drawing

Anchor Bolts

Shop Specs

Cast-in anchoring for equipment and steel structures. L-type or straight, bent hooks and thread lengths made to drawing, with material and corrosion guidance.

GB/T 799

Head/drive styleDiameter × lengthProperty class

M16×400M16×600

50 SKUs