Bored Flanges

Manufactured using 304L stainless steel KF flanges, commonly known by International Standards Organization as Klein Flansche (KF) fittings, are used in vacuum piping and high vacuum chambers (10-8 Torr). Flanges align with a centering ring (sold separately) and o-ring seal and must be tightly clamped.  Clamps are sold separately. 304L stainless steel flanges are ideal for systems with extreme temperatures and corrosive environments.  KF (QF) Flanges are also available in Aluminum or Brass for general applications.

Bored KF Flange SS

Size SKU Bore A B C Weight Lbs Price
50 QF50-200-SBB 2.01 2.01 1.935 0.15 0.25 $20.00 Add to cart
50 QF50-150-SBB 1.51 1.51 1.435 0.12 0.25 $17.00 Add to cart
50 QF50-100-SBB 1.01 1.01 0.935 0.12 0.25 $17.00 Add to cart
50 QF50-050-SBB 0.51 0.51 0.505 n/a 0.25 $17.00 Add to cart
50 QF50-025-SBB 0.26 0.26 0.255 n/a 0.25 $17.00 Add to cart
40 QF40-150-SBB 1.51 1.51 1.435 0.15 0.25 $14.00 Add to cart
40 QF40-100-SBB 1.01 1.01 0.935 0.12 0.25 $12.50 Add to cart
40 QF40-075-SBB 0.76 0.76 0.715 0.12 0.25 $12.50 Add to cart
40 QF40-050-SBB 0.51 0.51 0.466 0.12 0.25 $12.50 Add to cart
40 QF40-037-SBB 0.38 0.38 0.38 n/a 0.25 $12.50 Add to cart
40 QF40-025-SBB 0.26 0.26 0.255 n/a 0.25 $12.50 Add to cart
25 QF25-100-SBB 1.01 1.01 0.935 0.15 0.25 $10.00 Add to cart
25 QF25-075-SBB 0.76 0.76 0.715 0.12 0.25 $9.00 Add to cart
25 QF25-050-SBB 0.51 0.51 0.375 0.12 0.25 $10.00 Add to cart
25 QF25-037-SBB 0.38 0.38 0.38 n/a 0.25 $9.00 Add to cart
25 QF25-025-SBB 0.26 0.26 0.255 n/a 0.25 $9.00 Add to cart
16 QF16-075-SBB 0.76 0.76 0.685 0.14 0.25 $9.00 Add to cart
16 QF16-050-SBB 0.51 0.51 0.451 0.16 0.25 $9.00 Add to cart
16 QF16-037-SBB 0.38 0.38 0.38 0.15 0.25 $8.00 Add to cart
16 QF16-025-SBB 0.26 0.26 0.255 n/a 0.25 $8.00 Add to cart
10 QF10-050-SBB 0.51 0.51 0.451 0.5 0.25 $9.00 Add to cart
10 QF10-025-SBB 0.26 0.26 0.255 n/a 0.25 $9.00 Add to cart

KF Weld Flange - SS

Size SKU Fig A B C Tube OD Weight Lbs Price
50 QF50-200-SF 2 2.01 1.935 0.62 2 0.25 $19.50 Add to cart
40 QF40-150-SF 2 1.51 1.435 0.5 1.5 0.25 $13.00 Add to cart
25 QF25-100-SF 2 1.01 0.935 0.5 1 0.25 $10.00 Add to cart
16 QF16-075-SF 1 0.75 0.625 0.5 0.75 0.25 $9.00 Add to cart
10 QF10-050-SF 1 0.5 0.375 0.5 0.5 0.25 $9.00 Add to cart

KF Weld Stub - SS

Size SKU A B C Tube OD Weight Lbs Price
50 QF50-200-SST 2 1.87 0.75 2 0.25 $19.50 Add to cart
40 QF40-150-SST 1.5 1.37 0.75 1.5 0.25 $13.00 Add to cart
25 QF25-100-SS 1 0.875 0.5 1 0.25 $10.00 Add to cart
16 QF16-075-SS 0.75 0.625 0.5 0.75 0.25 $10.00 Add to cart
10 QF10-050-SS 0.5 0.375 0.5 0.5 0.25 $9.00 Add to cart

SS Weld Ring

SKU A B C Tube OD Weight Lbs Price
QF50-200-RF 2.01 1.935 0.17 2 0.25 $17.00 Add to cart
QF40-150-RF 1.51 1.435 0.17 1.5 0.25 $12.50 Add to cart
QF25-100-RF 1.01 0.935 0.17 1 0.25 $9.00 Add to cart
QF16-075-RF 0.76 0.625 0.17 0.75 0.25 $9.00 Add to cart