0item in your cart

125mm Aluminum Stand-up Block

Part No. 3261

Maximum working load (kg) 4990 kg

Maximum working load (lb) 11000 lb

Sheave Ø (mm) 125 mm

Sheave Ø (in) 4 15/16 in

Maximum line Ø (mm) 19 mm

Maximum line Ø (in) 3/4 in

Black Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action. Sideplates and sheaves Hard Lube-anodized for maximum UV protection and a smooth surface. Center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
Length (mm)230 mm
Length (in)9 1/16 in
Width (mm)127.5 mm
Width (in)5 1/32 in
Weight (g)1268 g
Weight (oz)44.72 oz
Maximum working load (kg)4990 kg
Maximum working load (lb)11000 lb
Breaking load (kg)9979 kg
Breaking load (lb)22000 lb
Sheave Ø (in)4 15/16 in
Sheave Ø (mm)125 mm
FootnoteUses hole spacing and base dimensions of 648 padeye. Maximum working load decreases at varying angles.
Maximum line Ø (mm)19 mm
Maximum line Ø (in)3/4 in
IncludesIncludes padeye. Uses hole spacing and base dimensions of 648 padeye. Maximum working load decreases at varying angles.
A (mm)93 mm
A (in)3 21/32 in
B (mm)106 mm
B (in)4 3/16 in
C (mm)57 mm
C (in)2 1/4 in
Composer Export589174362BOM IDDescriptionQty1AL-3771 ALPHA CHEEK12AL-3772 BETA CHEEK13H-34392B SHEAVE ASSM.14HBB88 ROLLER CAGE ASSM.15HFS1272 FST. 6 X 1 X 10MMSHSS16HFS1275 FST. 8 X 1.25 X 16MM SHCS37MP-1865 STANDUP DEVICE18MP-3037 HD. POST COLLAR29MS-3018-11tooltip
ID BOM Qty Price
H-34392B 1 more info

Sheave Assembly - 125 mm Black Magic Block

Sheaves are Hard Lube-anodized for maximum UV protection and a smooth surface. Captive Delrin ball bearings carry side loads.

HFS1272 1 more info

Fastener - M6 1 x 10mm Socket Head Shoulder Screw Cup, Black

Set screw allows shackle to be fixed or to swivel.

MP-3037 2 more info $1.75
Add to cart

Headpost Collar Half - 100/125 mm Black Magic Block

Headpost collar isolates dissimilar metals to prevent corrosion. Collar accepts set screw that fixes shackle in one direction or allows it to swivel.

MP-1865 1 more info $25.20
Add to cart

Stand-up Base - 100/125 mm Block

Made of durable, flexible rubber, the stand-up boot holds block upright without snagging lines.

HBB88ASSY 1 more info

Roller Cage Assembly - 125 mm Black Magic Block

Center cage keeps Torlon® roller bearings separated and parallel to reduce friction.

HFS1275 3 more info $2.15
Add to cart

Fastener - M8 x 1.25 x 16 mm Socket Head Cap Screw, Black

Fasten with M8 hex wrench.

AL-3771 1 more info $206.10
Add to cart

Sideplate with Helicoils - 125 mm Black Magic Block

Sideplates are Hard Lube-anodized for maximum UV protection and a smooth surface.

AL-3772 1 more info $206.10
Add to cart

Sideplate with Isolators - 125 mm Black Magic Block

Sideplates are Hard Lube-anodized for maximum UV protection and a smooth surface. Dissimilar metals are isolated to prevent corrosion.

MS-3018 1 more info $372.10
Add to cart

Padeye Assembly with Head Post - 100/125 mm Block

17-4 PH stainless steel padeye base. Use 10 mm (3/8") fasteners.

Note

Uses hole spacing and base dimensions of 648 padeye. Maximum working load decreases at varying angles.

Harken US Offices will be closed Thursday November 24th & Friday November 25th. Any orders placed after 12pm CST Wednesday November 23rd will be processed upon re-opening on Monday November 28th.

Close